• 专利附录
  • 专利说明
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    • 专利摘要:
    gas circuit breaker. it is a pair of fixed-arc electrodes that are arranged facing each other inside a sealed container that is filled with arc-extinguishing gas. are provided: a compression blower chamber to accumulate pressurized gas that is obtained by raising the pressure of the arc extinguishing gas; and an insulated nozzle that directs the pressurized gas to the arc discharge from the compression blower chamber. the temporary storage chamber is provided, in which the hot exhaust gas generated by the heat from the arc discharge is temporarily accumulated. a space of flow through the pressurized gas is provided, which communicates with the compression blower chamber. in the pressurized gas through-flow space, an opening / closing section prevents hot exhaust opening / closing section is opened to allow the flow of pressurized gas.
    公开号:BR112015007014B1
    申请号:R112015007014-0
    申请日:2013-09-26
    公开日:2021-04-27
    发明作者:Tadashi Koshizuka；Toshiyuki Uchii；Takeshi Shinkai；Takanori Iijima；Tadashi Mori；Norimitsu Kato；Hiroshi Furuta
    申请人:Kabushiki Kaisha Toshiba；
    IPC主号:
    专利说明:

    FIELD
    [0001] This embodiment of the present invention relates to a gas circuit breaker that aims to achieve an improved circuit breaker performance without allowing the hot exhaust gas produced by the arc discharge to contribute to the elevation of the blower chamber pressure. BACKGROUND
    [0002] Typically, in power systems, gas circuit breakers are used to perform current switching, including in the case of fault current. In the common blower type of gas circuit breaker, the arc discharge is extinguished by directing the arc extinguishing gas to the arc.
    [0003] An example is disclosed in Japanese Patent Issued Tokko H 7-109744 (hereinafter referred to as Patent Reference 1). A specific description of such a blower type gas circuit breaker is given below with reference to Figure 6A, Figure 6B and Figure 6C. Figure 6A to Figure 6C show a symmetrical shape through rotation whose geometric axis of rotation is the central line; Figure 6A is the driving condition; Figure 6B is the front half of the current interrupting action; and Figure 6C is the rear half of the current interruption action.
    [0004] As shown in Figure 6A to Figure 6C on a blower type gas circuit breaker, a coating arc electrode 2 and an energized electrode with opposite coating eae are provided on a concentric geometric axis with these electrodes 2 and 3, a movable arc electrode 4 and a movable energized electrode 5 are arranged in a freely reciprocal manner. These electrodes 2 to 5 are accommodated in a sealed compartment (not shown) that is filled with arc extinguishing gas 1. Like arc extinguishing gas 1, SF6 gas (gaseous sulfur hexafluoride), which performs arc (extinguishing performance) and excellent electrical insulation performance, is usually employed, however, other means could also be employed.
    [0005] The movable arc electrode 4 is mounted on the tip of a hollow drive rod 6; the mobile energized electrode 5 is mounted on the tip of a blower cylinder 9. Also, an insulated nozzle 8 is mounted inside the mobile energized electrode 5, on the tip of the blower cylinder 9. This mobile arc electrode 4, mobile energized electrode 5, actuating rod 6, isolated mouth 8 and blowing cylinder 9 are integrally constituted. These fully constituted parts are activated together with the electrodes on the mobile side 4, 5 and will thus be called the mobile section in common. In addition, a fixed piston 15 is freely slidable on the blowing cylinder 9. The fixed piston 15 is fixed inside the sealed container independently of the aforementioned movable section. An inlet orifice 17 and an inlet valve 19 are provided on the fixed piston 15.
    [0006] A blowing chamber 22 consists of the space that is defined by the actuating rod 6, the blowing cylinder 9 and the sliding face 15a of the fixed cylinder 15. The blowing cylinder 9 and the fixed piston are means for pressurizing the extinguishing gas of arc 1 in the blowing chamber 22 and the blowing chamber 22 constitutes a pressure accumulation space in which the pressurized arc extinguishing gas 1 is accumulated. The isolated nozzle 8 is a means of defining (rectifying) and directing (blasting) the arc extinguishing gas flow 1 from the blowing chamber 22 towards the arc discharge 7.
    [0007] In a blower type gas circuit breaker constructed as above, in the closed condition, the cladding arc electrode 2 and the movable arc electrode 4 are mutually connected and in current conduction condition and the energized cladding electrode 3 and the mobile energized electrode 5 are mutually connected and in current conduction condition (see Figure 6A). When the current interruption action is performed from this closed condition, the mobile arc electrode 4 and the mobile energized electrode 5 are driven in the right direction in Figure 6A, Figure 6B and Figure 6C by the actuating rod 6.
    [0008] When, as the actuating rod 6 is activated, the coating arc electrode 2 and the movable arc electrode 4 are separated; an arc discharge 7 is generated between these arc electrodes 2, 4. In addition, following the interrupting action, the volume of the blowing chamber 22 is reduced by mutual approach of the blowing cylinder 9 and the fixed piston 15, causing the arc extinguishing gas 1 in the chamber is mechanically compressed (see Figure 6B). Insulated nozzle 8 shapes (rectifies) the arc extinguishing gas flow 1 that is compressed in the blower chamber 22 and directs that flow to the arc discharge 7 like a gas jet 21, thereby extinguishing the arc discharge 7 (see Figure 6C).
    [0009] Furthermore, if the blower type gas circuit breaker performs a closing action, at the point in time when the pressure of the blower chamber 22 becomes lower than the filling pressure of the arc extinguishing gas 1, the inlet valve 19 provided on the fixed piston 15 is operated, thus opening the inlet orifice 17, in order to refill the arc extinguishing gas inlet 1 to the blower chamber 22. In this way, the extinguishing gas of arc 1 in the blower chamber 22 can be quickly replenished even during the closing action immediately after the power interruption. Consequently, even if the blower-type gas circuit breaker performs a high-speed re-closing action, the arc discharge 7 can be safely extinguished by maintaining the sufficient gas flow rate of the gas jet 21 in the second interruption action.
    [0010] However, when the blower type gas circuit breaker interrupts a large current, the pressure of the arc extinguishing gas 1 in the blower chamber 22 needs to be raised to a blast pressure that is completely sufficient to extinguish the arc discharge 7. In these circumstances, if an attempt is made to increase the blast pressure of the arc extinguishing gas 1 simply with the use of a powerful drive mechanism, due to the need to install such a powerful drive mechanism, the mechanical vibration during the carrying out the interruption action is increased and the costs are also high.
    [0011] In a blower type gas circuit breaker, there is, therefore, a demand to reduce the driving operating force while maintaining a potent blasting pressure. In order to meet this demand, an action of raising the pressure of the blowing chamber 22 by introducing hot exhaust gas at high temperature 20 generated by the arc discharge 7, that is, a so-called self-pressurizing action is used. A self-pressurizing action on a blower-type gas circuit breaker is described below with reference to Figure 6B.
    [0012] Specifically, as shown in Figure 6B, in the anterior half of the current interrupting action, the coating arc electrode 2 is not completely extracted from the narrower flow path section (strangulation) of the isolated nozzle 8, with the result that the hot exhaust gas 20 from the periphery of the arc discharge 7 flows into the blower chamber 22. As a result, without having to employ a powerful drive mechanism that provides a large drive operating force, the pressure in The blower chamber 22 becomes high so that the blasting pressure of the gas jet 21 is maintained and a reduction in the actuation force can be achieved.
    [0013] In addition, in the case of a gas circuit breaker of the type called a gas blower of the series type (for example, as disclosed in Japanese Patent Issued (Tokko H 7-97466 (hereinafter referred to as Patent Reference 2), additional reduction in the drive operating force can be achieved by restricting the space affected by the self-pressurizing action.As shown in Figure 7A, Figure 7B and Figure 7C, a series blower type gas circuit breaker is characterized by the fact that the blower chamber is divided into two spaces by a division plate 10. It should be noted that, in Figure 7A, Figure 7B and Figure 7C, the members that are the same as in the blower type gas circuit breaker shown Figure 6A, Figure 6B and Figure 6C are given the same reference numerals and additional description is dispensed in. Figure 7A to Figure 7C, similarly, show a symmetrical shape through rotation whose geometric axis of rotation is the cent line ral; Figure 7A is the driving condition; Figure 7B is the front half of the current interrupting action; and Figure 7C is the rear half of the current interruption action.
    [0014] Of these two spaces in which the blower chamber is divided, the space in which the hot exhaust gas 20 is introduced from the space in which the arc discharge 7 is generated is designated as a heating blower chamber 11 and the space in which the fixed piston 15 is freely and slidably disposed on the opposite side of it is designated as a compression blower chamber 12. A communication slot 13 is provided in the dividing plate 10 that divides the heating blower chamber 11 and the compression blowing chamber 12 and a non-return valve 14 is mounted thereon. In addition, an exhaust port 16 and a pressure relief valve 18 are arranged on the fixed piston 15. The pressure relief valve 18 is arranged to open when the pressure of the compression blowing chamber 12 rises to a predetermined defined value.
    [0015] In a series gas blower type circuit breaker built as above, in the front half of the current interrupting action, as shown in Figure 7B, the coating arc electrode 2 does not pass completely through the flow path section narrower (strangulation) of the insulated nozzle 8, then the hot exhaust gas 20 produced by the arc discharge 7 flows into the heating blower chamber 11. Consequently, the pressure of the heating blower chamber 11 is greatly increased by the self-pressurizing action achieved. by arc heating, then a pressure is sufficient to extinguish the arc discharge 7 can be obtained and the high pressure required for large current interruption can be created within the closed space of the heating blower chamber 11.
    [0016] Through it, although the pressure of the heating blower chamber 11 is high due to the pressure of the compression blower chamber 12, the non-return valve 14 is closed passively by this pressure difference. Consequently, although the pressure of the heating blower chamber 11 is high, there is no possibility of its effect reaching the compression blower chamber 12, therefore, there is no possibility of the form of actuation acting on the fixed piston 15, which slides through the chamber. compression blower 12, be increased. As the current interruption action continues, the pressure in the compression blower chamber 12 becomes high and, when the pressure of the compression blower chamber 12 exceeds that of the heating blower chamber 11, the check valve 14 opens, allowing the arc extinguishing gas 1 to flow into the heating blower chamber 11 from the compression blower chamber 12 and, thus, making it possible to blast the arc discharge 7 with a gas jet 21 that has the amount and the gas jet pressure required for current interruption.
    [0017] It should be noted that the pressure relief valve 18 opens as soon as the pressure of the compression blower chamber 12 rises to a predefined value. Consequently, the pressure of the compression blower chamber 12 is always kept below the defined value, that is, only a pressure restricted by the pressure relief valve 18 is applied to the fixed piston 15. There is, therefore, no possibility of the pressure inside the chamber. compression blower 12 become excessively high pressure, which could apply a high load to the drive mechanism.
    [0018] In addition, in the case of interruption of a small current in a series gas blower type circuit breaker, the self-pressurizing action produced by the arc heating is small, therefore, the pressure increase of the blower chamber warming 11 by this action cannot be expected. Consequently, the pressure of the compression blowing chamber 12 is relatively higher than the pressure of the heating blowing chamber 11, so that the non-return valve 14 is in an open condition. As a result, arc extinguishing gas 1 flows into the heating blower chamber 11 from the compression blower chamber 12 due to the compressive action of the fixed piston 15, so the blasting pressure required for the current interruption can be guaranteed .
    [0019] However, a solution to the following problems of a conventional gas circuit breaker was still awaited. (1) GAS JET TEMPERATURE
    [0020] In a conventional gas circuit breaker, the hot exhaust gas 20 from the arc is introduced into the blower chamber 22 or the heating blower chamber, so a jet of gas 21 which is heated to a high temperature is directed towards the discharge of arc 7. Consequently, the cooling efficiency of the arc discharge 7 is reduced, which can decrease the circuit breaker performance. (8) EFFECT OF THE GAS JET TEMPERATURE ON DURABILITY AND MAINTENANCE
    [0021] In addition, the temperature in the vicinity of the arc discharge 7 is raised by the high temperature gas jet 21 that is blown into the arc discharge 7. As a result, the arc electrodes 2, 4 and the insulated nozzle 8 tend to to be degraded by exposure to high temperature, generating a need for frequent maintenance. This is contrary to the user's needs for reduced durability and maintenance. (9) CURRENT INTERRUPTION TIME
    [0022] Additionally, it takes a certain amount of time to raise the pressure in the heating blower chamber 11 and in the blower chamber 22. The time required before the power interruption is completed can therefore be extended. As a gas circuit breaker is a device for quickly interrupting excess fault current in a power system, from the point of view of the basic function of a gas circuit breaker, it is always required that the time that elapses before the current interruption is completed should be as short as possible. (10) OPERATING OPERATION FORCE
    [0023] In addition, in order to reduce the operating force of a gas circuit breaker, it is important to simplify the construction and reduce the weight. For example, in the case of a series gas blower circuit breaker in which the blower chamber is divided into two, as auxiliary components, such as the dividing plate 10 and / or the check valve 14, construction is indispensable. tends to become more complicated and the weight of the moving parts tends to be increased. When the weight of the moving parts increases, a strong drive operating force is inevitably required. In other words, in a conventional series gas blower type circuit breaker, simplification of the construction is sought in order to contribute to the reduction in the weight of the moving parts. (11) DIRECTION OF GAS FLOW
    [0024] Furthermore, in a blower type gas circuit breaker in which a gas jet 21 is directed towards an arc discharge 7, stabilization of the arc 1 extinguishing gas flow within the apparatus is considered vital. In particular, in a series blower type gas circuit breaker, the arc extinguishing gas flow tends to become unstable and improvement in this respect is desired.
    [0025] Specifically, in a series gas blower type circuit breaker, the arc extinguishing gas 1 flowing out of the compression blower chamber 12 flows to the arc discharge 7 inside the insulated nozzle 8 after passing through of the heating blower chamber 11. Consequently, the area of the arc extinguishing gas flow path 1 from the compression blower chamber 12 through the communication opening 13 of the splitting plate 10 until reaching the arc discharge 7 is widely expended in the region of the heating blower chamber 11, therefore, a smooth flow of arc extinguishing gas 1 is prevented.
    [0026] In addition, in the event of a small current interruption, the pressure of the heating blower chamber 11 is low, since the thermal energy of the hot exhaust gas 20 is small; the arc extinguishing gas 1 flowing inwardly from the compression blower chamber 12 is therefore consumed in raising the pressure of the heating blower chamber 11 until it reaches the same pressure as that of the compression blower chamber 12. The pressure of the arc extinguishing gas 1 when directed to the arc discharge 7 was therefore very small, making it difficult to achieve superior interrupting performance.
    [0027] In addition, in a series gas blower type circuit breaker, in making the interruption in the large current region, the gas jet 21 is directed in the arc discharge 7 only by the pressure of the heating blower chamber 11 while , when performing the interruption in the small current region, the arc extinguishing gas 1 of the compression blower chamber 12 is directed to the arc discharge 7. In other words, in the case of a series gas blower type circuit breaker, the space that supplies the arc extinguishing gas 1 is changed between the heating blower chamber 11 and the compression blower chamber 12 according to the magnitude of the current that is interrupted.
    [0028] The above change is effected by passive opening / closing of the check valve 14 in response to the pressure difference of the heating blower chamber and the compression blower chamber 12. Consequently, in the intermediate current region, when the difference in pressure between the heating blower chamber 11 and the compression blower chamber 12 is small, the change in the source of supply of the arc extinguishing gas 1 becomes undetermined and the operation of the check valve 14 thus becomes unstable . Therefore, in spite of this action of the check valve 14, there was a risk that the arc 1 extinguishing gas flow could become unstable. (12) INTERRUPTION PERFORMANCE IN CASE OF HIGH-SPEED RE-CLOSING ACTION
    [0029] Furthermore, although it is clearly desirable for a gas circuit breaker to have excellent interrupting performance in the event of a high-speed reclosing action, there is the problem that an insufficient interrupting performance in reclosing action at high speed high speed is sometimes experienced with series blower gas circuit breakers. Specifically, the inlet orifice 17 and the inlet valve 19 are formed in the fixed piston 15, therefore, during the closing operation, although the arc extinguishing gas 1 is replenished by inlet from the same in the case of the blower chamber. compression 12, in the case of the heating blower chamber 11, no replenishment of the arc extinguishing gas inlet 1 is possible. As a result, the interior of the heating blower chamber 11 immediately after a first occurrence of current interruption is filled with arc extinguishing gas 1 which has been heated to a high temperature by the high temperature arc discharge 7.
    [0030] Consequently, if a second current interruption is carried out in a condition where the gas inside the heating blower chamber 11 has not been replaced by low-temperature, high-density arc 1 extinguishing gas, the extinguishing gas of high temperature and low density arc 1 will be directed to arc discharge 7. The arc extinction performance and the electrical insulation performance of gas at high temperature and low density are insufficient. There was, therefore, a concern that the interrupting performance of a series gas blower type circuit breaker could be degraded in the event of a high-speed re-closing action.
    [0031] The gas circuit breaker according to the present modality was proposed in order to solve all the problems described above. Specifically, an objective of the gas circuit breaker according to this mode is to provide a gas circuit breaker in which: the temperature of the gas jet is reduced; durability is improved and maintenance is reduced; the current interruption time is reduced; and the drive operating force is reduced; and, in addition, in which the arc extinguishing gas flow is stabilized and, in addition, the interruption performance during action and high speed re-closing is improved.
    [0032] In order to achieve the above objective, the following construction is provided in accordance with the present invention. Specifically, a gas circuit breaker is characterized by the fact that it consists of an opposite arrangement of a pair of arc electrodes in a sealed container filled with arc extinguishing gas, in which said arc electrodes are constructed in such a way that have electrical conduction capacity and are capable of generating arc discharge between these two electrodes during the interruption of current and be equipped with:
    [0033] a pressurization means in order to direct the arc extinguishing gas to said arc discharge, which generates pressurized gas by raising the temperature of said arc extinguishing gas;
    [0034] a pressure accumulation space that accumulates said pressurized gas; and
    [0035] a flow forming means that directs the pressurized gas towards said arc discharge from said pressure accumulation space;
    [0036] in which said gas circuit breaker comprises:
    [0037] a space for the accumulation of hot exhaust gas which is provided in order to temporarily accumulate the hot exhaust gas generated by the heat of said arc discharge; which comprises a space of flow through of pressurized gas that communicates with said space of pressure accumulation and a section of opening / closing that can be opened / closed freely, provided in order to produce a closed condition or an open condition of said pressure accumulation space; wherein said opening / closing section is constituted so that it is in a closed condition in the previous half of the current interruption period, in which it prevents the entry of said hot exhaust gas in said pressure accumulation space and is in a closed condition in the later half of the current interruption period, in order to direct the pressurized gas in said pressure accumulation space in said arc discharge. BRIEF DESCRIPTION OF THE DRAWINGS
    [0038] Figure 1A, Figure 1B and Figure 1C are cross-sectional views showing the construction of a first modality;
    [0039] Figure 2A, Figure 2B and Figure 2C are cross-sectional views showing the construction of a second modality;
    [0040] Figure 3A, Figure 3B and Figure 3C are cross-sectional views showing the construction of a third modality;
    [0041] Figure 4 is a graph showing an example of displacement of the firing electrode and piston in the third mode;
    [0042] Figure 5A, Figure 5B and Figure 5C are cross-sectional views showing the construction of a fifth modality;
    [0043] Figure 6A, Figure 6B and Figure 6C are cross-sectional views showing the construction of a conventional blower type gas circuit breaker; and
    [0044] Figure 7A, Figure 7B and Figure 7C are cross-sectional views showing the construction of a conventional series blower gas circuit breaker. DETAILED DESCRIPTION MODALITIES (13) FIRST MODALITY (CONSTRUCTION)
    [0045] The construction of a first embodiment of the invention is described below with reference to Figure 1A, Figure 1B and Figure 1C. It should be noted that, as the main construction of the first modality is similar to that of the conventional gas circuit breaker shown in Figure 6A, Figure 6B, Figure 6C and Figure 7A, Figure 7B, Figure 7C, to the members that are the same as in the case of the conventional gas circuit breaker shown in Figure 6A, Figure 6B, Figure 6C and Figure 7A, Figure 7B, Figure 7C, the same reference symbols are given and no further description is required. Figure 1A to Figure 1C, like Figure 6A to Figure 6C and Figure 7A to Figure 7C, show formats that are symmetrical through rotation on a central geometric axis such as the geometric axis of rotation, where Figure 1A is the condition conduction, Figure 1B is the condition in the anterior half of the current interruption action and Figure 1C is the condition in the posterior half of the current interruption action.
    [0046] In the first embodiment, a fixed arc electrode 30a is provided in place of the coating arc electrode 2; a fixed arc electrode 30b is disposed opposite that fixed arc electrode 30a. The fixed arc electrode 30b is provided at the tip of a cylindrical member 40 that extends to the left in the Figure from a sliding face 15a of the fixed piston 15. In other words, the fixed arc electrode 30b, the sliding face 15a of the fixed piston 15 and cylindrical member 14 are supplied integrally.
    [0047] Instead of being members that are included in the mobile section that includes the mobile energized electrodes 5 and the blowing cylinder 9, the pair of fixed arc electrodes 30a, 30b are members that are fixed inside a sealed container ( not shown). Also, the pressure inside the sealed container during a common operation is a single pressure on each part in the same place, for example, the pressure to fill the arc extinguishing gas 1.
    [0048] Within the arc electrodes fixed 30a, 30b, the rod-shaped trigger electrode 91, which has a smaller diameter than the arc electrodes fixed 30a, 30b, is arranged to move between the electrodes while is in contact with the fixed arc electrodes 30a, 30b. The firing electrode 31 is in contact with the fixed arc electrodes 30a, 30b and implements a conductive condition through the short circuit of these two fixed arc electrodes 30a, 30b. Also, in the event of a current interruption, an arc discharge 7 is generated between the firing electrode 31 and the fixed arc electrode 30a, but that arc discharge 7 has recently migrated away from the firing electrode 31 to the arc electrode mentioned earlier 30b.
    [0049] An isolated nozzle 32 is arranged so as to surround the trigger electrode 31. The isolated nozzle 32 is arranged so that it can be freely placed in contact with or separated from the surface of the trigger electrode 31. Like the electrodes of fixed arc 30a, 30b, the insulated nozzle 32 is not integrally incorporated in the movable section which includes the movable energized electrodes 5 and the blowing cylinder 9, but is instead fixed to an independent sealed container (not shown) of the mobile section.
    [0050] A movable piston 33 which is integrally attached to the blowing cylinder 9 is disposed within the blowing cylinder 9. The lower end section of the movable piston 33 slides over the outer surface of the cylindrical member 40. A temporary storage chamber 36 is formed on the left side of the movable piston 33 and a compression blowing chamber 12 is formed on the right side of the movable piston 33.
    [0051] The temporary storage chamber 36 consists of the space enclosed by the base of the insulated nozzle 32, the blowing cylinder 9, the movable piston 33 and the cylindrical member 40. The temporary storage chamber 36 is an accumulation space of hot exhaust gas to temporarily accumulate (store) the hot exhaust gas 20 which is generated by the heat from the arc discharge. Also, an exhaust port 37 is provided in the blowing cylinder 9 adjacent to the movable energized electrodes 5.
    [0052] Also, the compression blower chamber 12 on the right side of the movable piston 33 consists of the space enclosed by the movable piston 33, blower cylinder 9, the sliding face 15a of the fixed piston 15 and the cylindrical member 40. In the blower chamber of compression 12, the arc extinguishing gas 1 is mechanically compressed by the movable piston 33 according to the current interruption action, that is, the electrode opening action proceeds thus generating the pressurized gas 35 (shown in Figure 1C).
    [0053] However, a blow hole 34 is provided in the base section of the cylindrical member 40. The arrangement is such that the pressurized gas 35 in the compression blow chamber 12 passes through that blow hole 34 and flows between the firing electrode 31 and the cylindrical member 40, before being directed to the arc discharge 7. The space between the firing electrode 31 and the cylindrical member 40 through which the pressurized gas 35 flows through the blow hole 34 is designated as a blanking space. through-flow of pressurized gas 43.
    [0054] The fixed arc electrode 30b is disposed at the end of this through-flow space of pressurized gas 43. An opening / closing section 41 is then formed by the contact portions of the fixed arc electrode 30b and the firing electrode 31. The opening / closing section 41 is constituted so as to have the ability to be freely opened / closed in order to place the pressure accumulation space constituted by the compression blower chamber 12 in a closed or open condition. In the initial half of the current interruption action, the opening / closing section 41 is in a closed condition, preventing the influx of hot exhaust gas 20 into the through-flow space of pressurized gas 43 and temporary storage chamber 36 ; but in the final half of the current interruption action, it is in an open condition, in order to direct the pressurized gas 20 in the blowing chamber 12 towards the arc discharge 7.
    [0055] In the compression blower chamber 12 and in the temporary storage chamber 35, an inlet port 17 and inlet valve 19. The inlet valve 19 is constituted in order to refill the arc extinguishing gas inlet. 1 in chambers 12 and 36 only when the pressure inside chambers 12, 36 is below the filling pressure in the sealed container. (CLOSED CONDITION)
    [0056] In the closed condition of the first mode, the fixed arc electrode 30a and the fixed arc electrode 30b are in a separate condition and the conductive condition is achieved (condition of Figure 1A) by the trigger electrode 31 which causes a short circuit on the fixed arc electrodes 30a, 30b. (CURRENT INTERRUPTION ACTION)
    [0057] When the first mode performs the current interruption action, the blower cylinder 9 is activated by the electrode opening direction, that is, the direction to the right in Figure 1A, Figure 1B and Figure 1C by an operating mechanism drive (not shown) and the temporary storage chamber 36 on the left side of the movable piston 33 is expanded in volume together with this electrode opening drive. Consequently, the temporary storage chamber 36 sucks in the hot exhaust gas 20 generated by the arc discharge 7 and temporarily accumulates (stores) that hot exhaust gas; by raising the internal pressure of the temporary storage chamber 36, the hot exhaust gas 20 is discharged as appropriate from the exhaust port 37, which is supplied in the blower cylinder 9. Also, the arc extinguishing gas 1 inside the blower chamber Compression 12 is pressurized by being compressed by the movable piston 33, by the electrode opening actuation of the blower cylinder 9 in the right direction in Figure 1A to Figure 1C, thus generating pressurized gas 35. (CONDITION OF FIGURE 1B AND FIGURE 1C).
    [0058] When, connected to the movement of the blower cylinder 9, the firing electrode 31 is also activated in the direction of opening contacts, that is, the direction to the right in Figure 1A, Figure 1B and Figure 1C and the firing electrode 31 is thus separated from the arc electrode fixed on the right side 30a in Figure 1A, Figure 1B, Figure 1C, the arc discharge 7 between the two electrodes 31 and 30a is caused (condition of Figure 1B). The period during which the arc discharge 7 for the trigger electrode 31 is caused is only the initial period of the interruption process, until the arc discharge 7 is migrated to the fixed arc electrode 30b. At that point in time, the fixed arc electrode 30b and the firing electrode 31 are in contact, so the opening / closing section 41 is in a closed condition: the through-flow space of pressurized gas 43 is thus in a condition sealed condition in Figure 1A and Figure 18, with the exception of the inevitable crack that must be provided to allow the mutual sliding action of the electrodes 30b, 31.
    [0059] That is, the opening / closing section 41 is in the closed condition because of the contact of the fixed arc electrode 30b and the firing electrode 31, then, the communication of the flow space through the pressurized gas 43 and the space in which the arc discharge 7 is generated is obstructed. In other words, by closing the opening / closing section 41, the entry of the hot exhaust gas 20 into the through-flow space of pressurized gas 43 is prevented. In this way, it is guaranteed that, leaving aside the operationally unavoidable gap between electrodes 30b and 31, the hot exhaust gas 20 which has undergone thermal expansion due to the heat of the arc discharge 7 cannot flow into the compression blower chamber 12 through the space of through-flow of pressurized gas 43 and blowing orifice 34.
    [0060] When the fixed arc electrode 30b and the trigger electrode 31 are separated, the arc discharge 7 that is generated between the fixed arc electrode 30a and the trigger electrode 31 migrates from the trigger electrode 31 to the electrode fixed arc 30b and arc discharge 7 is generated between the fixed arc electrodes 30a and 30b (condition of Figure 1C).
    [0061] When the fixed arc electrode 30b and the firing electrode 31 separate, the opening / closing section 41 which prevented the entry of hot gas 20 into the through-flow space of pressurized gas 43 assumes the open condition. In other words, the contact of the fixed electrode 30b and the firing electrode 31 is released and the space of through-flow of pressurized gas 43 and the space in which the arc discharge 7 is generated are placed in communication. Consequently, the compression blower chamber 12 and the space in which the arc discharge 7 is generated are connected through the blow hole 34 (condition of Figure 1C).
    [0062] In this way, the pressurized gas 35 in the pressure chamber 12, which was compressed by the movable piston 33, is ejected from the inside of the fixed arc electrode 30b, through the blow hole 34 and the throughflow space of pressurized gas 43. The insulated nozzle 32 then shapes the flow of pressurized gas 35 before directing it by force to the arc discharge 7 and can thus extinguish the arc discharge 7. In this process, the pressurized gas 35 passing through the pressurized gas throughflow space 43 is injected in the vicinity of the end section of the gas discharge 7 closest to the fixed arc electrode 30b, so the arc discharge 7 can be extinguished more reliably. (BENEFICIAL EFFECT)
    [0063] The beneficial effect of the first modality described above is as follows. (A) REDUCING THE GAS JET TEMPERATURE
    [0064] The first modality has a characteristic feature that the self-pressurizing action produced by arc heating is not used. Consequently, instead of being thermally processed by the hot exhaust gas 20, the pressurized gas 35 which is directed to the arc discharge 7 can be a low temperature gas whose pressure is raised only by mechanical compression.
    [0065] Although the possibility of inflating an extremely small amount of the hot exhaust gas 20 into the compression blowing chamber 12 from the sliding gap between the fixed arc electrode 30b and the firing electrode 31 cannot be denied, its effect is extremely mild. Consequently, the temperature of the pressurized gas 35 which is directed to the arc discharge 7 is much lower than the temperature of the conventional gas jet 21 which uses the self-pressurizing action. As a result, the cooling effect of directing the pressurized gas 35 to the arc discharge 7 can be greatly increased. (B) IMPROVED DURABILITY AND REDUCED MAINTENANCE
    [0066] In this mode, the temperature in the vicinity of the arc discharge 7 is reduced by directing the low-temperature pressurized gas 35 therein. Consequently, the deterioration of the fixed arc electrodes 30a, 30b and the isolated nozzle 32 produced by the current interruption can be alleviated in a very significant way, improving durability. As a result, the maintenance frequency of the fixed arc electrodes 30a, 30b and the insulated nozzle 32 can be reduced, making it possible to reduce the maintenance load.
    [0067] Also, since the arc electrodes 30a, 30b, which are attached to the sealed container, do not affect the weight of the movable section, the arc electrodes fixed 30a, 30b can be made with great thickness without concerns about the weight increase. Consequently, the durability of arc electrodes 30a, 30b in relation to large current arcs can be significantly improved. In addition, if the arc electrodes 30a, 30b are made with great thickness, the concentration of electric field at the ends of the arc electrode 30a, 30b when the high voltage is applied through the electrode gap can be considerably relieved.
    [0068] The required electrode slit interval can therefore be reduced compared to a conventional gas circuit breaker. As a result, the length of the arc discharge 7 becomes shorter and the electrical input energy for the arc discharge 7 during the interruption of current becomes smaller. In the case of a gas circuit breaker that uses the self-pressurizing action of the arc heating, the reduction of the electrical input energy for the arc discharge is associated with the reduction of the self-pressurizing action and is therefore undesirable from the point of view of current interruption performance.
    [0069] However, since, in this mode, the self-pressurizing action of arc heating is not used, the reduction of electrical input energy for arc discharge 7 may have no effect in terms of current interruption performance. . The beneficial effect that a major contribution to the improved thermal durability is obtained can therefore be achieved, despite the fact that the arc electrodes fixed 30a, 30b are made thicker. A corresponding benefit is also obtained when the insulated nozzle 32 is made larger.
    [0070] Incidentally, consideration has been given, for example, to a construction in which, in order to pressurize arc 1 extinguishing gas without using a self-pressurizing action, compressed gas is generated in advance by a compressor in a fuel tank. high pressure reserve and the compressed gas is directed to the arc discharge 7 by the synchronized opening of the circuit breaker valves in the current interruption. However, since this involves the addition of auxiliary components such as the reserve tank, the compressor and the electromagnetic valves in order to achieve such a construction; this has the disadvantages of tending to increase the size and cost of the equipment, with adverse consequences in terms of maintenance.
    [0071] In contrast, in the first embodiment, an extremely simple construction can be deployed in which, during normal operation, the pressure in the sealed container is a single pressure, for example, the pressure of filling the arc extinguishing gas 1 in all portions of the sealed container and the necessary pressurized gas 35 is generated only in the current interruption stage. Consequently, with the first modality, compactness of equipment and cost reduction can be achieved, allowing the workload involved in maintenance to be reduced. (C) SHORTENING THE CURRENT INTERRUPTION TIME
    [0072] As described above, when using the self-pressurizing action of the arc heating, a certain amount of time is required in order to pressurize the arc extinguishing gas 1 in the blower chamber to a pressure that is high enough to reach the interruption. Consequently, in a conventional interruption system that employs the self-pressurizing action of arc heating, the time before the interruption of the current is completed tends to be prolonged.
    [0073] However, in this modality, a self-pressurizing action based on arc heating is not employed, so the pressure and flow rate of the pressurized gas 35 that is directed to the arc discharge 7 can be kept constant regardless of flow conditions. Also, the timing of the start of the application of the pressurized gas jet 35 is determined by the timing with which the tip of the firing electrode 31 passes the fixed arc electrode 30b so that these two are separated and is, therefore, always fixed regardless flow conditions. There is, therefore, no possibility of the time required for the completion of the current interruption to be prolonged, as in the case of the conventional gas circuit breaker and it is possible to satisfy the demand for shortening the time for the completion of the current interruption. (D) REDUCING THE DRIVING OPERATION FORCE
    [0074] The firing electrode is smaller in diameter than the fixed arc electrodes 30a, 30b and can therefore be made lighter in weight than the conventional movable arc electrode 4 and the driving rod 6. Also, in addition to the two electrodes fixed arc 30a, 30b, the insulated nozzle 32 is not included in the movable section, so the weight of the movable section can be reduced to a large extent.
    [0075] With this modality, in which the weight of the moving section is reduced in this way, the driving operating force that is necessary for the current interruption, to obtain the opening speed of contacts of the moving section, can be greatly reduced part. Additionally, since, in this mode, the cooling effect of the arc discharge 7 that is achieved by the low temperature pressurized gas jet 35 is considerably high, the interruption of the arc discharge 7 can be achieved with a lower pressure, and this also contributes to the reduction of the drive operating force.
    [0076] Furthermore, in this modality, a configuration is adopted in which the low temperature pressurized gas 35 that is ejected from the interior of the fixed arc electrode 30b is directed in order to cut transversely from the inside to the outside, being concentrated at the root of the arc discharge 7, which is located in the vicinity of the fixed arc electrode 30b. On the other hand, in the case of conventional gas circuit breakers shown in Figure 6A, Figure 6B, Figure 6C and Figure 7A, Figure 7B, Figure 7C, the arc extinction gas 1 is blown for the arc discharge 7 from the outside; in both of these conventional gas circuit breakers, the arc extinguishing gas 1 flows along the longitudinal direction of the arc discharge 7.
    [0077] When the arc extinguishing gas 1 flows so as to cut along the root of the arc discharge 7, the loss of heat from the arc in that region is greater than in the case where the arc extinguishing gas 1 flows in the longitudinal direction in relation to arc discharge 7. In order to achieve current interruption by reducing the electrical conductivity between the two arc electrodes 30a, 30b it is not necessary that the entire arc discharge 7 must be cooled in all portions of the arc same, as long as the temperature is sufficiently reduced in some location of the same.
    [0078] According to this observation, in this modality, an ideal construction for current interruption would be one in which the low temperature pressurized gas 35 flows in such a way as to cut along the arc discharge 7 from the inside to the outside, being concentrated in the root of the arc discharge 7. With this modality, it is possible to cut the arc with an even lower pressure and, therefore, it becomes possible to reduce the actuation force while still maintaining excellent interruption performance.
    [0079] Incidentally, it is known that the arc 1 extinguishing gas flow configuration in the isolated nozzle has an extremely great influence on the performance interruption. The isolated nozzle 8 in the conventional gas circuit breaker is incorporated in the mobile section and is therefore activated during the current interruption action: therefore, the arc extinguishing gas flow 1 in the isolated nozzle 8 fluctuates considerably depending, for example, on the stroke position at each occasion, and the speed of opening contacts. It is, therefore, impossible to always achieve an ideal flow path format in relation to the arc 1 extinguishing gas flow, under all current conditions.
    [0080] In contrast, in the present embodiment, the insulated nozzle 32 and the arc electrodes 30a, 30b are all fixed. Therefore, there can be no change in the position of these members; furthermore, since no use is made of the self-pressurizing effect of arc heat, performance is always consistent, regardless of current conditions, regardless of pressure or flow rate of pressurized gas 35 which is directed to arc discharge 7. It is, therefore, possible to design the flow path in the insulated nozzle 32 in an optimized manner in order to be ideal in relation to the arc interruption.
    [0081] In addition, the volume of the storage chamber has a port 36 on the left side of the movable piston 33 expands with the opening contact actuator, so hot exhaust gas 20 is pulled from the arc discharge 7 and temporarily accumulated (weapon - temporarily zen) in it, increasing the pressure in the temporary storage chamber 36. This pressure increase provides a force that presses the movable piston 33 in the right direction in Figure 1A, in Figure 1B, in Figure 1C and this acts as a force that assists the drive operation of the mobile section. Consequently, the drive operating force that is required for the drive operating mechanism can be reduced.
    [0082] It should be noted, however, that if the groove size of the exhaust port 37 is increased, the hot exhaust gas discharge rate 20 is high, on the other hand, hardly any pressure boosting effect of the temporary storage chamber 36 in assisting the drive operation can then be expected. However, even in this case, at least, there is no antagonistic action to the driving operation force. Consequently, the generation of hot exhaust gas 20 by arc discharge 7 can reduce the actuation operating force, in comparison with the case of a conventional gas circuit breaker, where this hot exhaust gas invariably acts as a force opposite to drive operating force. (E) GAS FLOW STABILITY
    [0083] Additionally, in this modality, complex valve control to, for example, adjust the pressure in the compression blower chamber 12 is unnecessary and, in addition, the self-pressurizing action of the arc heating in raising the jet pressure of the arc extinguishing gas 1 is not used. Consequently, the same pressure gas jet and the stable gas flow rate can always be obtained regardless of current interruption conditions. As a result, performance instability that depends on the magnitude of the interrupting current may never arise. (F) IMPROVED INTERRUPTION PERFORMANCE IN CASE OF HIGH SPEED NEW CLOSING ACTION
    [0084] Additionally, since an inlet orifice 17 and an inlet valve 19 are provided in the compression blower chamber 12 and in the temporary storage chamber 36, if the pressure in these chambers becomes less than the loading pressure in the sealed container , the replenishment of the arc 1 extinguishing gas is achieved by its automatic admission. The low temperature arc extinguishing gas 1 is therefore quickly replenished in the compression blower chamber 12 during the closing action. Consequently, even in the case of a second interruption step at high speed re-closing work, there is no risk of degradation of interruption performance.
    [0085] Therefore, as described above, with this modality, all the problems of a conventional gas circuit breaker can be solved simultaneously. Specifically, with this modality, a gas circuit breaker can be provided in which, by reducing the temperature of the gas jet and implementing a simple construction, the driving operation force can be reduced to a large extent and by means of which the stable flow of the arc extinguishing gas can be achieved, and it also combines excellent interrupting performance and durability. (14) SECOND MODE (CONSTRUCTION)
    [0086] The construction of a second embodiment is described below with reference to Figure 2A, Figure 2B and Figure 2C. The main template is the same as in the case of the first modality, so identical members are given the same reference numbers and additional description of them is dispensed with. This second embodiment has the characteristic feature that, instead of the blowing cylinder 9, it comprises a blowing cylinder 38 which is not provided with an exhaust port 37 for the hot exhaust gas. (BENEFICIAL EFFECT)
    [0087] In the second embodiment, by providing a blower cylinder 38 that is not provided with an exhaust port 37, the hot exhaust gas 20 that is generated by the arc discharge 20 flows into the temporary storage chamber 36 and it accumulates in it, increasing, in large part, the pressure of the temporary storage chamber 36. This pressure increase acts as a force that assists the operation of the drive of the mobile section, so that the force that is required by the operating mechanism drive can be reduced to a large extent. In other words, the pressure rise produced by the hot exhaust gas 20 from the arc discharge 7 can be positively transferred to the actuation force, making it possible to further reduce the actuation force.
    [0088] This beneficial effect of reducing the drive operating force is obtained to an excellent degree, in particular, under large current interruption conditions. Specifically, the speed of opening contacts becomes higher as the interruption current becomes greater, making it possible, in this way, to achieve faster arc interruption. The damage to the fixed arc electrodes 30a, 30b or to the insulated nozzle 32 can therefore be further reduced.
    [0089] It should be noted that, in order to increase the pressure of the temporary storage chamber 36, it would be possible to make the exhaust port 37 for the hot exhaust gas 20 even smaller, however, in this case, the amount of gas hot exhaust 20 flowing from the space where the arc discharge 7 is generated is reduced, with the risk that heat escape performance may be degraded. It is therefore necessary to design the size of the exhaust port 37 appropriately in a range so that the heat escape performance of the arc discharge 7 is not impaired. (15) THIRD MODE (CONSTRUCTION)
    [0090] The construction of a third modality is described below with reference to Figure 3A, Figure 3B and Figure 3C. A characteristic feature of the third modality is that, although the blowing cylinder 9 and the movable piston 33 perform movement connected to the firing electrode 31, the construction is such that both of these movements operate independently.
    [0091] Consequently, the operating speed of the blowing cylinder 9 and the movable piston 33 and the operating speed of the firing electrode 31 are arranged to be different, so that the construction is such that the blowing cylinder 9 and the movable piston 33 make contact opening before firing electrode 31. This construction, although not shown, can be easily implanted by, for example, a variable speed connection mechanism or the like. (BENEFICIAL EFFECT)
    [0092] With this third modality, in addition to the beneficial effect possessed by the modalities described above, the following independent beneficial effect is achieved. This will be described with reference to Figure 4. Figure 4 shows an example of the displacement (operating stroke) of the blower cylinder 9 and the movable piston 33 and the displacement of the firing electrode 31.
    [0093] In the first modality described above, the blower cylinder 9, the movable piston 33 and the firing electrode 31 are fully actuated, so that the two displacements in question of the course follow the same curve. In contrast, in the third embodiment, the blower cylinder 9 and the movable piston 33 follow a displacement curve that is mutually independent from that of the firing electrode 31.
    [0094] As shown in Figure 4, in the third modality, a construction is adopted through which the blower cylinder 9 and the movable piston 33 open contacts before the firing electrode 31, so that, in the jet initiation stage of pressurized gas 35, where the firing electrode 31 passes the fixed arc electrode 30b, the arc extinguishing gas 1 in the compression blower chamber 12 is raised in pressure substantially to the final pressure.
    Consequently, the amount of the hot exhaust gas 20 from the arc discharge 7 flowing back to the compression blower chamber 12 is small, so that at the point in time when the pressurized gas jet 35 is started , a pressurized gas jet 35 of lower temperature can be reached. It should be noted that the example shown in Figure 4 is merely an example and several patterns of the operating courses of the firing electrode 31, the blower cylinder 9 and the movable piston 33 can be considered.
    [0096] For example, if importance is given to a low temperature compressed gas jet, as shown in Figure 4, it is preferable to arrange the contact opening of the blower cylinder 9 and the movable piston 33 before opening contact electrode trigger 31. On the other hand, if importance is given to a faster performance of recovery of insulation between the electrodes, it is preferable to perform the contact opening of the trigger electrode 31 before the opening of contact of the blower cylinder 9 and the movable piston 33.
    [0097] The details of the adjustments of these contact opening timings must be properly determined according to the design concept of the gas circuit breaker in question; however, in all cases, in this mode, the blower cylinder 9 and the movable piston 33 do not fully operate with the firing electrode 31, but are arranged to operate independently: in this way, a more flexible design can be achieved and a reduction additional drive force can be achieved.
    [0098] Thus, with the third modality built as above, as well as in the case of the first and second modes, a considerable reduction in the operating force of the drive can be achieved by a simple construction and a circuit breaker can be provided combining excellent interrupting performance and durability. Additionally, by arranging for the movable piston 33 and the firing electrode to be operated independently instead of being operated integrally, a more flexible design becomes possible and, in addition to the beneficial effects of the modalities described above, an additional reduction in the operating force drive can be achieved. (16) FOURTH CONSTRUCTION MODALITY
    [0099] A characteristic feature of the fourth modality is the drive operation mechanism in which the compressive force is applied to the blower piston 9. This drive operation mechanism is constructed so that the position of the blower piston 9 is temporarily maintained by the less in the final position, of the stroke made by the blower piston 9, so that the blower piston 9 does not end up being moved backwards, in the opposite direction to the compressive force of the pressurized gas 35, by the pressure of the pressurized gas 35 in the compression blower chamber 12 Since the method of maintaining the position of the blower piston 9, for example, in the case where the drive operating mechanism is a hydraulic operating mechanism, a method such as the provision of a check valve may be mentioned at some point in the hydraulic circuit. BENEFICIAL EFFECT
    [00100] As described above, in this embodiment, at the same time that the tip of the firing electrode 31 passes the fixed arc electrode 30b, the pressurized gas 35 in the compression blower chamber 12 which is compressed by the movable piston 33 is forcibly directed for arc discharge 7: in this way, excellent current interruption performance can be obtained.
    [00101] However, in a gas circuit breaker for use in AC, a zero point of current is found in each half cycle (for example, 10 ms, in the case of a 50 Hz power delivery system), reaching thus, an arc time span in which the interruption can be carried out in at least a half cycle or as much as necessary. In this modality, the current interruption can be reached from the stage where the pressurized gas jet 35 is initiated by the tip of the firing electrode 31 that passes the fixed arc electrode 30b, but the arc extinguishing gas must be present in the compression blower chamber 12 in a pressure and amount that is totally sufficient for the arc interruption at least at the zero point of current after half a cycle.
    [00102] If a sufficient amount and pressure of pressurized gas 35 is generated in the compression blower chamber 12, the required compression time span can be achieved even if the compression by the blower piston 9 is not sustained by the half cycle. However, during this period, the pressure of the pressurized gas 35 acts on the movable piston 33 as a counter pressure force in the direction opposite to the direction of compression.
    [00103] It is therefore necessary to retain the blower piston 9 until the pressurized gas 35 in the compression blower chamber 12 has passed through the blow hole 34 and the flow space through the pressurized gas 43 to be discharged at the discharge. of arc 7, thereby lowering the pressure sufficiently inside the compression blower chamber 12 so that the blower piston 9 does not move backwards. This backward movement of the blower piston 9 can be suppressed, for example, by avoiding the backward movement by adopting a method such as providing a check valve in the hydraulic circuit of the hydraulic operating mechanism.
    [00104] With this fourth modality built as described above, in addition to the beneficial effects that the driving operation force can be greatly reduced by a simple construction and excellent interruption and durability performance can be achieved, since the position of the blower piston 9 is temporarily held at least in the final position, it is possible to prevent the blower piston 9 from being moved backwards, in opposition to the compression direction, by the pressure of the pressurized arc extinguishing gas. (17) FIFTH CONSTRUCTION MODALITY
    [00105] The construction of a fifth modality will now be described with reference to Figure 5A, Figure 53 and Figure 5C. In this fifth embodiment, an insulating blow cylinder 44 produced from insulation material is disposed within a blow cylinder 38 which is not provided with an exhaust port 37. The insulation blow cylinder 44 is a member cylindrical cross-section in a ring shape that is integrally constructed with the trigger electrode 31, mobile energized electrode 5 and blower cylinder 38.
    [00106] A fixed piston 39 is disposed inside the isolation blower cylinder 44. The fixed piston 39 is fixed to the inner wall of a sealed container, not shown. The fixed piston 39 slides along the inner wall face of the insulation blower cylinder 44 and divides the internal space of the insulation blower cylinder 44 in two. In this fifth embodiment, in an arrangement that is the opposite of that of the first embodiment described above, the temporary storage chamber 36 is formed on the right side of the fixed piston 39 and the compression blower chamber 12 is formed on the left side of the fixed piston 39. The fixed piston 39 is arranged for the purpose of compressing the arc extinguishing gas 1 inside the compression blower chamber 12 by the contact opening actuation of the isolation blower cylinder 44.
    [00107] The compression blower chamber 12 is constituted for the purpose of being sealed until the contact opening position approaches the last half of the contact opening process and so as not to allow a positive influx of hot exhaust gas 20 for the compression blower chamber 12. Specifically, in the isolation blower cylinder 44, a blow hole 34 for the pressurized gas 35 is formed in the left-hand end section of the compression blower chamber 12, which is on the left side. The groove face of the blow hole 34 is provided in a position that can contact the outer circumference section of the fixed arc electrode 30a. The groove face of this blowing hole 34 constitutes an opening / closing section 41 in this fifth embodiment.
    [00108] Furthermore, its construction is such that a gap through which the hot exhaust gas 20 can flow is formed between the insulating blower cylinder 44 and the cylindrical member 40. In addition, an inlet hole 45 for the hot exhaust gas 20 is formed in the vicinity of the end section on the right side of the isolation blower cylinder 44. The hot exhaust gas 20 flows into the temporary storage chamber 36 through this inlet hole 45.
    [00109] In addition, an inlet orifice 17 and an inlet valve 19 are provided on the two end faces of the isolating blow cylinder 44. Inlet orifice 17 and inlet valve 19 are constructed so that the replenishment of arc extinguishing gas inlet 1 is carried out only when the internal pressure of the compression blower chamber 12 and the temporary storage chamber 36 is less than the filling pressure inside the sealed container. It should be noted that, in the fifth embodiment, the isolated nozzle 32 is dispensed and the blowing hole 34 of the isolation blower cylinder 44 performs the function of the flow forming means that guides the pressurized gas 35 to the arc discharge 7.
    [00110] In the fifth embodiment, the fixed arc electrode 30b and the cylindrical member 40 are integrally provided, but no sliding face 15a of the fixed piston 15 is provided at the end of the cylindrical member 40, so that, in the previous half of the period current interruption, the end face of the isolation blower cylinder 44 on the right side in the Figure slides over the cylindrical member 40. In addition, when the last half of the current interruption period is reached, the end faces of the cylindrical member 14 and the isolation blower cylinder 49 become separate. In this way, by separating the end faces of the cylindrical member 14 and the isolating blower cylinder 44, an escape orifice 37 (shown in Figure 5C) of the temporary storage chamber 36 is formed. CLOSING CONDITION
    [00111] In the closing condition of the fifth modality, as well as in the first modality described above, the fixed arc electrode 30a and the fixed arc electrode 30b are in a separate condition and a conduction condition is achieved by means of the electrode dis - paro 31 that short-circuits the fixed arc electrodes 30a, 30b (condition of Figure 5A). CURRENT INTERRUPTION ACTION
    [00112] When a current interruption action is performed according to the fifth modality, the blower cylinder 38 and the isolation blower cylinder 44 perform the contact opening actuation in the right direction in Figure 5A , in Figure 5B and Figure 5C, by means of the actuation mechanism (not shown), causing the volume of the temporary storage chamber 36 on the right side of the fixed piston 39 to expand with this action of opening contacts. In addition, by opening the blower cylinder 38 and insulating cylinder 44 in the right direction in Figure 5A, Figure 5B and Figure 5C, the fixed piston 39 compresses the gas extinguishing arc 1 in the compression blower chamber 12, thereby generating pressurized gas 35.
    [00113] In the previous half of the current interruption period, the end face on the right side of the isolation blower cylinder 44 in the Figure slides over the cylindrical member 40, allowing the hot exhaust gas that is generated by the arc discharge 7 flow into the temporary storage chamber 36 from the inlet port 45. The temporary storage chamber 36 therefore temporarily accumulates (temporarily stores) hot gas 20 (condition of Figure 5B).
    [00114] Connected to the operation of the blower cylinder 38 and the insulation blower cylinder 44, the firing electrode 31 is also activated in the direction of opening contacts, that is, in the direction to the right in Figure 5A, in Figure 5B , in Figure 5C; when the firing electrode 31 separates from the fixed-arc electrode on the right side 30a of Figure 5A, of Figure 5B, of Figure 5C, an arc discharge 7 is initiated between the two electrodes 31 and 30a (condition of Figure 5B). The period in which an arc discharge 7 is initiated at the firing electrode 31 is exclusively the initial period of the interruption step, until the arc discharge 7 migrates to the fixed arc electrode 30b.
    [00115] At that time, the fixed arc electrode 30a and the groove face of the blow hole 34 of the isolation blower cylinder 44 are contiguous. The contact portion, therefore, constitutes an opening / closing section 41 and the compression blower chamber 12 is placed in a sealed condition (condition of Figure 5A and Figure 5B), in addition to the crack that is inevitable in view of the action of necessary slip of the fixed arc electrode 30a and the isolation blower cylinder 44.
    [00116] That is, due to the contact of the fixed arc electrode 30a and the groove face of the blow hole 34 of the isolation blower cylinder 44, the communication of the compression blower chamber 12 and the space in which the arc discharge 7 is generated is avoided; thus the aforementioned opening / closing section 41 can prevent the entry of hot exhaust gas 20 into the compression blower chamber 12, in addition to the crack that is inevitable in terms of the operation of the fixed arc electrode 30a and the isolation blower cylinder 44.
    [00117] With further progress of the current interruption action, arc discharge 7 is generated between the fixed arc electrode 30a and the trigger electrode 31 migrates from the trigger electrode 31 to the fixed arc electrode 30b, so that the arc discharge 7 is generated between the fixed arc electrodes 30a, 30b. When the current interruption action approaches the last half, the blow hole 34 of the insulation blow cylinder 44 passes the fixed arc electrode 30a and the groove face of the blow hole 39 of the insulation blow cylinder 44 is separated from the fixed arc electrode 30a. In this way, the opening / closing section 41 changes from the closed condition to the open condition.
    [00118] Furthermore, with a timing that is approximately equal to the timing with which the opening / closing section 41 assumes the open condition, the end faces of the cylindrical member 40 and the isolation blower cylinder 44 are separated, with the result that the exhaust port 37 of the temporary storage chamber 36 is opened. At that point, the pressurized gas 35 which is directed to the arc discharge 7 passes through the end face of the isolation blower cylinder 44 and is discharged into the space inside the sealed container (condition of Figure 5C).
    [00119] In this way, the blowing orifice 34 can forcibly direct the low-temperature pressurized gas 35 in the compression blowing chamber 12 to the arc discharge 7, effectively cooling and extinguishing the arc discharge. 7 and then interrupting the current. In addition, the pressurized gas 35 in the compression blower chamber 12 is injected in the vicinity of the end portion of the arc discharge 7 closest to the fixed arc electrode 30a, thereby making it possible to achieve a more reliable extinction of the arc discharge 7 . BENEFICIAL EFFECT
    [00120] In the fifth modality, as described above, with the contact opening actuation of the isolation blower cylinder 44, the fixed piston 39 generates high-pressure pressurized gas 35 inside the compression blower chamber 12. This elevation action of pressure allows low temperature compressed gas to be generated, since the self-pressurizing action produced by arc heating is not used in any way.
    [00121] If the interrupting current is small, the heat generated by the arc discharge 7 is small, then the pressure of the hot exhaust gas of thermal expansion 20 is small. Since the volume of the temporary storage chamber 36 into which the hot exhaust gas 20 flows is expanded by driving the isolation blower cylinder 44, therefore, there is a possibility that the pressure in that portion will become a negative pressure. If this happens, a quick replenishment of the temporary storage chamber 36 with arc extinguishing gas 1 is carried out from the inlet valve 19 and the inlet orifice 17 in order to suppress the generation of the drive reaction produced by the negative pressure in that portion.
    [00122] On the other hand, if the interrupting current is large, the pressure of the hot exhaust gas 20 acts on the wall surface on the side of the isolation blower cylinder 44 closest to the inlet orifice 45, that is, it can act as a force of isolation blower cylinder 44. In addition, since, in this fifth embodiment, the isolation blower cylinder 44 is produced from insulating material, even though it is present between the electrodes in the condition of opening contacts, it does not threaten to degrade electrical insulation performance.
    [00123] As described above, with this fifth embodiment, the compression of the pressurized gas 35 which is directed to the arc discharge 7 is carried out entirely by mechanical compression, thus hot exhaust gas 20 which is thermally expanded by the heat of the arc discharge 7 does not flow into the compression blower chamber 12. Furthermore, the pressure of the hot exhaust gas 20 can act as a force that assists in the actuation operation. Consequently, the drive operating force can be greatly reduced by a simple construction and a gas circuit breaker can be provided which combines excellent breaking performance and durability. Thus, with this fifth modality as well, exactly the same beneficial effects as the beneficial effects described with reference to the first modality can be obtained. (18) OTHER MODALITIES
    [00124] The most important points in the construction of the modalities described above are that the compression of the arc extinguishing gas 1, that is, the pressurized gas 35 that is directed to the arc discharge 7 is effected mainly by mechanical compression, and the arc extinguishing gas 1, that is, the hot exhaust gas 20 which is thermally expanded by the heat of the arc discharge 7 is positively prevented from flowing into the pressure accumulation space constituted by the compression blower chamber 12. In addition Furthermore, a structurally important point is that the construction is adopted in which the pressure of the arc extinguishing gas 1 which is thermally expanded by the heat of the arc discharge 7 does not act as a drive operation reaction in the mobile section of the gas circuit breaker , but it can act as a force that assists in the drive operation.
    [00125] Although the above modalities have the characteristic features above, they are merely presented in this specification as examples and are not intended to restrict the scope of the invention. Specifically, the invention can be put into practice in several other ways and various omissions, substitutions or changes can be carried out within a range that is not outside the scope of the invention. Such modalities or modifications are included in the essence of the invention and, likewise, included in the scope of the invention presented in the embodiments of the patent and in the scope of equivalents thereof.
    权利要求:
    Claims (5)
    [0001]
    1. Gas circuit breaker comprising: a pair of fixed arc electrodes (30a, 30b) configured to be disposed in an opposite manner, in which the arc electrodes are fixed inside a sealed container filled with arc extinguishing gas (1 ); a firing electrode (31) configured to be freely and mobilely disposed between said pair of fixed arc electrodes, with an arc discharge being generated between one of said pairs of fixed arc electrodes (30a) and said electrode trigger, said arc discharge being migrated to the other of said pairs of fixed arc electrodes (30b); an insulated nozzle (32) configured to be disposed between said pair of fixed arc electrodes and disposed in a position mutually remote from said pair of fixed arc electrodes; a pressurizing means (33) for generating pressurized gas (35) by raising an arc extinguishing gas pressure; and a pressure accumulation space (12) adapted to accumulate said pressurized gas; characterized by the fact that said gas circuit breaker comprises: a temporary storage chamber (36) which is provided in order to temporarily accumulate a hot exhaust gas (20) generated by heat from said discharge, in which said gas chamber temporary storage (36) consists of a space enclosed by said insulated nozzle (32), a freely movable cylinder (9), a movable piston (33) and a cylindrical member (40), the other of said arc electrode pair fixed (30b) being provided at the tip of the cylindrical member (40); and an opening / closing section (41) that can be opened / closed freely, provided in order to produce a closed condition or open condition of said pressure accumulation space, wherein said opening / closing section it is constituted in such a way that said opening / closing section is in a closed condition in the previous half of a current interruption period, in which said opening / closing section prevents the entry of said hot exhaust gases in said accumulation space pressure, in order to direct said pressurized gas in said pressure accumulation space to said arc discharge, wherein said pressurized gas in said pressure accumulation space is ejected from one internal side of the other pair of said pair fixed arc electrode (30b) through an explosion orifice (34) and a pressurized gas flow space (43) between said firing electrode (31) and said cylindrical element (40), wherein said insulated nozzle (32) then shapes the flow said pressurized gas before forcibly directing it to said arc discharge.
    [0002]
    2. Gas circuit breaker, according to claim 1, characterized by the fact that said opening / closing section (41) is a portion through a space where the other pair of said pair of fixed arc electrodes ( 30b) and said trigger electrode (31) are close together.
    [0003]
    3. Gas circuit breaker, according to claim 1, characterized by the fact that an inlet orifice (17) and an inlet valve (19) are provided with said pressurization means.
    [0004]
    4. Gas circuit breaker, according to claim 1, characterized by the fact that the pressurization means comprises: said freely movable blowing cylinder (9); said movable piston (33) provided integrally with said freely movable blowing cylinder (9); and a fixed portion (15) which is configured to be arranged in a freely slidable manner inside said blowing cylinder (9), facing the movable piston (33), however, said movable piston (33) and said arc electrode (31) moves in a mutually connected manner during current interruption, the movement speeds of said movable piston and said arc electrode are different.
    [0005]
    5. Gas circuit breaker, according to claim 3, characterized by the fact that said trigger electrode (31) has a smaller diameter than said fixed arc electrode pair (30a, 30b).
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    同族专利:
    公开号 | 公开日
    EP3157036A1|2017-04-19|
    BR112015007014A2|2017-07-04|
    CN106206155A|2016-12-07|
    EP3157036B1|2019-06-12|
    US20150194280A1|2015-07-09|
    EP2903013A1|2015-08-05|
    IN2015DN02410A|2015-09-04|
    JP6157824B2|2017-07-05|
    EP2903013A4|2016-06-08|
    CN104662634A|2015-05-27|
    US10032582B2|2018-07-24|
    WO2014050108A1|2014-04-03|
    CN106206155B|2019-03-08|
    JP2014072032A|2014-04-21|
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    法律状态:
    2018-11-21| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-01-07| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-03-09| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-04-27| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 26/09/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2012216894A|JP6157824B2|2012-09-28|2012-09-28|Gas circuit breaker|
    JP2012-216894|2012-09-28|
    PCT/JP2013/005712|WO2014050108A1|2012-09-28|2013-09-26|Gas-blast circuit breaker|
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