• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    This contactor (10) comprises: - at least one vacuum interrupter (12), each having a fixed contact (14), a movable contact (16) and a rod (18) integral with the movable contact (16), the rod ( 18) being movable between a closed position of the switch (12) in which the movable contact (16) bears against the fixed contact (14) and an open position of the switch (12) in which the movable contact (16) is away from the fixed contact (14), and - a first member (20) for moving each rod (18) in a direction of movement (X), from the closed position to the position opening. The contactor (10) further comprises means (30) for regulating the speed of movement of each rod (18), throughout the movement of said rod (18) from the closed position to the position of opening.
    公开号:FR3028347A1
    申请号:FR1460730
    申请日:2014-11-06
    公开日:2016-05-13
    发明作者:Cem Ozen；Nicolas Quentin；Jean-Guillaume Laxalt
    申请人:Alstom Transport Technologies SAS；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a contactor comprising at least one vacuum switch, each having a fixed contact, a movable contact and a rod integral with the switch. mobile contact, the rod being movable between a closed position of the switch in which the movable contact bears against the fixed contact and an open position of the switch in which the movable contact is away from the contact fixed, and a first member for moving each rod in a direction of movement, from the closed position to the open position. The invention relates to railway contactors comprising one or more vacuum interrupters, also called vacuum interrupters. These vacuum bulbs are used in particular in the railway field, and are for example installed in high voltage contactors, arranged on the roof of a railway vehicle between a pantograph and an electrical transformer. US 3,674,955 discloses a vacuum circuit breaker operating on a three-phase network and comprising three vacuum switches, each having a fixed contact and a movable contact. This circuit breaker comprises a mechanism for controlling the opening or closing of the vacuum interrupters, the control mechanism comprising three separate actuating rods, each being connected to the moving contact of a respective vacuum switch. This circuit breaker also comprises an actuator adapted to control the control mechanism and a hydraulic system adapted to cooperate with said control mechanism. The hydraulic system is a threshold effect system and allows, at the end of the opening movement of the switches, to absorb remaining kinetic energy, to eliminate shocks and to avoid induced rebounds of the rods. actuation, while not acting on the opening speed at the beginning of the opening movement, in order to have an opening speed as high as possible at the beginning of the opening stroke. The hydraulic system comprises a piston exerting a pressure on oil inside a closed chamber, and operates its energy absorption function at the end of the opening stroke, when the oil pressure at the end of the opening stroke The interior of the enclosure is large enough to move a moving part and release an oil discharge port. However, such a circuit breaker has a relatively limited life, the vacuum switches being quite fragile. The object of the invention is therefore to provide a contactor having a longer life, reducing the risk of damage to the circuit. or vacuum switches. To this end, the invention relates to a contactor of the aforementioned type, wherein the contactor further comprises means for regulating the speed of movement of each rod, throughout the movement of said rod from the closed position until 'to the open position. The contactor according to the invention allows, by said regulating means, to regulate the opening speed of each vacuum interrupter throughout the opening of said switch. This then makes it possible to guarantee a suitable opening speed of each vacuum interrupter, throughout the opening movement of said switch, and not only at the end of the opening movement. The longevity of the vacuum interrupter (s), and consequently of the contactor according to the invention, is then improved. According to other advantageous aspects of the invention, the contactor comprises one or more of the following characteristics, taken separately or in any technically possible combination: the regulation means are configured to limit the speed of displacement to a speed less than one predetermined threshold; - The regulating means are configured to decrease the speed of movement of each rod, throughout the movement of said rod from the closed position to the open position; the regulation means are hydraulic control means; the regulation means comprise at least one hydraulic damper; the regulation means comprise two hydraulic dampers; - The contactor further comprises a guide member of each rod in the direction of movement; - The two hydraulic dampers are arranged on either side of the guide member; each hydraulic damper comprises a piston capable of sliding inside an enclosure in a direction of sliding, the piston comprising a plurality of orifices for the passage of a fluid, said orifices being successively arranged in the direction of sliding; - The switch further comprises a second member for moving each rod in the direction of movement, from the open position to the closed position; the contactor comprises a plurality of vacuum interrupters and a mechanical link member for the rods of the switches, the first displacement member being configured to move said link member from the closed position to the open position, and the regulation means being configured to regulate the speed of movement of the connecting member, throughout the movement of the connecting member and the rods from the closed position to the open position; and - the guide member is configured to guide the connecting member in the direction of movement. These features and advantages of the invention will become apparent on reading the following description, given solely by way of nonlimiting example, and with reference to the appended drawings, in which: FIG. 1 is a diagrammatic representation of a three-phase contactor according to the invention, comprising three vacuum switches, the switches being in the closed position and each comprising a fixed contact, a movable contact and a rod integral with the movable contact, the contactor further comprising means for regulating the speed of movement of each rod from the closed position to an open position of the switches, said regulating means comprising two hydraulic dampers, - Figure 2 is a view similar to that of Figure 1, the switches being in opening position, - Figures 3 to 6 are sectional views of one of the hydraulic dampers of Figure 1, according to different positions of a piston of said damper, - Figure 7 is a curve showing a braking force exerted by the damper of Figures 3 to 6, as a function of the stroke of the piston, and - Figure 8 is a curve representing the speed of the damper piston of Figures 3 to 6, as a function of time. In the remainder of the description, the expression "substantially equal to" defines a relation of equality to plus or minus 10 ° A, or a relation of equality to plus or minus 100 when this expression relates to an angle.
    [0002] In FIGS. 1 and 2, a contactor 10 comprises at least one vacuum switch 12, each comprising a fixed contact 14, a movable contact 16 and a rod 18 secured to the movable contact 16. The rod 18 is movable between a closed position of the switch 12 in which the movable contact 16 bears against the fixed contact 14 (FIG. 1) and an open position of the switch 12 in which the movable contact 16 is away from the fixed contact 14 ( Figure 2).
    [0003] The contactor 10 comprises a first member 20 for moving each rod 18 during an opening stroke of the switch 12, that is to say from the closed position to the open position, following a direction of displacement X. The contactor 10 also comprises a second member 22 for moving each rod 18 during a closing stroke of the switch 12, that is to say from the open position up to the closing position, in the direction of displacement X. In addition optional, the switch 10 comprises a member 24 for guiding each rod 18 in the direction of movement X. In the embodiment described, the switch 10 comprises several switches vacuum 12 and a member 26 mechanical connection rods 18 switches. The contactor 10 is in particular a three-phase contactor and then comprises three vacuum switches 12. When the contactor 10 comprises a plurality of vacuum switches 12, the first displacement member 20 is then configured to move said connecting member 26 from the closed position. towards the open position, the second displacement member 22 is configured to move said connecting member 26 from the open position to the closed position, and the guide member 24 is configured to guide said connecting member 26 in the direction of displacement X. The switch 10 further comprises means 30 for regulating the speed of movement of each rod 18 in the direction of movement X, throughout the movement of said rod 18 from the closed position (FIG. 1) to the open position (Figure 2). In other words, the regulating means 30 are means of regulating the opening speed of the switch or switches 12, throughout the opening stroke of the switch or switches 12.
    [0004] The contactor 10 comprises a support 32 to which are mechanically connected, in the embodiment of Figures 1 and 2, the first displacement member 20, the guide member 24 and the control means 30. The contactor 10 is for example a high voltage contactor, that is to say adapted to allow the passage of an electric current having a voltage greater than 750 V, more preferably greater than 50 kV. The electric switch 10 is for example intended to equip a railway vehicle, not shown, and in particular to be arranged in a rail traction box between an inverter and a three-phase electric motor, not shown. Each vacuum interrupter 12, also known as a vacuum interrupter, comprises a vacuum enclosure 34 inside which the fixed and movable contacts 14 and 16 are arranged, the enclosure 34 comprising an orifice 36 for the passage of the rod 18. rod 18 is indeed able to slide inside and outside the chamber 34, and is then equipped, at the passage hole 36, a bellows (not shown) to maintain the Vacuum inside the enclosure 34. The enclosure 34 is, for example, integral with a frame 38. The fixed contact 14 and the movable contact 16 are each electrically connected to a respective electrical connection terminal, not shown. , each connection terminal being disposed outside the enclosure 34. The fixed contacts 14 and movable 16, also called respectively fixed contact member and movable contact member, are electrically conductive. As known per se, the connection terminals are able to be electrically connected to each other in the closed position of the corresponding switch 12, the fixed and movable contacts 14 then being in abutment with each other, and are suitable to be electrically insulated from each other in the open position of the corresponding switch 12, the fixed and movable contacts 14 and 16 being then separated from each other. Each rod 18 preferably extends in the direction of displacement X.
    [0005] Each rod 18 has, for example, a circular section in a transverse plane perpendicular to the direction of movement X, to facilitate its movement inside the chamber 34 between the closed position and the open position of the 12. The first displacement member 20 is configured to cause the displacement of each rod 18 during the opening stroke. The first displacement member 20 is, for example passive, and is then configured to cause said displacement of each rod 18 only when the second displacement member 22 is inactive. The first displacement member 20 is preferably a resilient displacement member, and comprises for example a spring 40 disposed between the support 32 and the connecting member 26, or between the support 32 and the rod 18 when the contactor 10 comprises A single switch 12. In the embodiment of Figures 1 and 2, the spring 40 is a compression spring. Alternatively, the spring 40 is a tension spring.
    [0006] The second displacement member 22 is configured to cause the displacement of each rod 18 during the closing stroke. The second displacement member 22 comprises an actuator 42, such as an electromagnetic or electropneumatic actuator, capable of causing the displacement of the connecting member 26, or of the rod 18 when the contactor 10 comprises a single switch 12, since the closed position to the open position.
    [0007] The second displacement member 22 is preferably active only during the closing stroke, and inactive during the opening stroke in order to let the first displacement member 20 act on the connecting member 26 and / or on the or the rods 18. The guide member 24 is, for example, in the form of a through hole 44 formed in the support 32 and extending in the direction of displacement X. In the embodiment of FIGS. 2, the through hole 44 is configured to receive an arm 46 of the connecting member, the arm 46 being mechanically connected to the actuator 42. The through hole 44 is configured to allow the sliding of the arm 46 in the direction of displacement X.
    [0008] The connecting member 26 comprises a plate 48 connected to each of the rods 18, the plate 48 extending for example in the transverse plane perpendicular to the direction of movement X. The connecting member 26 comprises the arm 46, the arm 46 extending substantially in the direction of movement X and being fixed to the plate 48. The spring 40 of the first displacement member bears against the plate 48, and is able to cause the displacement of said plate 48 during the race opening when the actuator 42 is inactive. When the spring 40 is a compression spring, it is able to exert a downward pressing force along the arrow F1 against an upper surface of the plate 48, as shown in FIG. 1. As a variant not shown, when the spring 40 is a tension spring, it is able to exert a pulling force downwards (arrow F1) on a lower surface of the plate 48. The regulation means 30 are configured to regulate, throughout the opening stroke, the speed of displacement of each rod 18, for example to limit said speed of movement to a speed below a predetermined threshold. In other words, the regulating means 30 are configured to regulate the opening speed of each vacuum interrupter 12, for example to limit said opening speed to a value below the predetermined threshold, and this throughout the race. 'opening. The predetermined threshold is, for example, equal to 0.4 m.s-1 to prevent damage to the vacuum switch 12. The value of the predetermined threshold is preferably between 0.3 m.s-1 and 1 m.s-1.
    [0009] The regulation means 30 are configured to regulate, throughout the opening stroke, the speed of displacement of the connecting member 26 when the contactor 10 comprises a plurality of vacuum switches 12 and that the rods 18 are mechanically connected by the connecting member 26. The regulating means 30 are, for example, further configured to reduce, ie reduce, the speed of movement of each rod 18 and / or the connecting member 26 throughout the race opening.
    [0010] According to this example, the regulation means 30 are preferably configured to permanently reduce the speed of movement of each rod 18 and / or the connecting member 26 during the opening stroke. In other words, the derivative with respect to time of the speed of displacement of each rod 18 and / or of the connecting member 26, that is to say the acceleration associated with the displacement of each rod 18 and / or the connecting member 26 is then always negative during the opening stroke. The regulation means 30 are preferably hydraulic control means, that is to say means providing said speed control by implementing a circulation of a fluid. The fluid used for this regulation is, for example, oil, in particular a silicone-based oil whose viscosity coefficient is substantially constant over a wide temperature range of between -40 ° C. and + 80 ° C. The regulating means 30 comprise at least one hydraulic damper 50, preferably two hydraulic dampers 50 as shown in FIGS. 1 and 2. When the regulating means 30 comprise two hydraulic dampers 50, said dampers 50 are preferably arranged on each side. other of the guide member 24, preferably further arranged symmetrically with respect to the guide member 24, in order to best distribute the efforts of the dampers 50 relative to the guide member 24. The support 32 forms, as previously described, a means of mechanical connection of different elements of the contactor 10, including the spring 40 and the dampers 50. The support 32 further comprises a stop surface 52 forming a stop of the stopper member. link 26, in particular of the plate 48, at the end of the opening stroke. The abutment surface 52 is, for example, a flat surface, substantially perpendicular to the direction of displacement X. In FIGS. 3 to 6, each hydraulic damper 50 comprises a hermetic enclosure 54 and a piston 56 capable of sliding inside. of the chamber 54 in a sliding direction. The direction of sliding of the piston 56 is preferably parallel to the direction of displacement X of each rod 18, in order to facilitate the regulation of the speed of displacement of each rod 18. The piston 56 comprises a plurality of orifices 58A, 58B, 58C, 58D of fluid passage between a first chamber 60 and a second chamber 62, the two chambers 60, 62 being disposed inside the chamber 54. In the embodiment of Figures 3 to 6, the piston 56 has four through holes, namely a first through hole 58A, a second through hole 58B, a third through hole 580 and a fourth through hole 58D. The passage orifices 58A, 58B, 580, 58D are successively arranged in the direction of sliding of the piston 56. These passage orifices 58A, 58B, 580, 58D are intended to be closed successively and cumulatively, by a protuberance 64 in FIG. protruding into the shock absorber. This gradual closure of an increasing number of through-holes 58A, 58B, 58C, 58D makes it possible to progressively reduce the speed of movement of the piston 56 during the compression of the damper 50, as will be explained hereinafter.
    [0011] The operation of the contactor 10 according to the invention will now be described. The regulation means 30 are provided to act on the speed of displacement of each rod 18 throughout the movement of said rod 18 from the closed position of the corresponding switch 12 to the open position of said switch 12, that is to say when the first displacement member 20 moves each rod 18 during the opening stroke of the switch or switches 12. In the embodiment of Figures 1 and 2, this corresponds to the case where the or the switches 12 are in the closed position and the second displacement member 22 is no longer controlled to move each rod 18, that is to say when the actuator 42 becomes inactive. In this case, the spring 40 acts on the connecting member 26 by moving it along the arrow F1 in Figure 1 to separate each movable contact 16 of the fixed contact 14 corresponding. During the opening stroke of the one or more switches 12, the regulating means 30 then regulate the opening speed of the one or more switches 12, in particular limiting the value of this opening speed to a value lower than the predetermined threshold, which reduces the risk of damage to or switches 12 during this opening. In the exemplary embodiment described, this speed regulation is obtained by the compression of the hydraulic damper (s) 50 along arrow F1 in FIG. 1. This compression of each hydraulic damper 50 is illustrated in FIGS. 3 to 6, since Figure 3 to Figure 6, Figure 3 showing the damper 50 at the beginning of the compression and Figure 6 showing the damper 50 at the end of compression. The regulation preferably corresponds to a gradual decrease in the opening speed during the opening stroke of the one or more switches 12, and the regulation means 30 then progressively reduce the speed of opening of the switch (s) 12 over time. when this opening is ordered. In the embodiment described, this reduction in the opening speed is obtained from the plurality of passage orifices 58A, 58B, 580, 58D arranged successively in the direction of sliding of the piston 56. In fact, at the beginning of the opening stroke of each switch 12, i.e. at the beginning of the stroke of the piston 56 from top to bottom in FIGS. 3 to 6, the fluid, such as the oil, flows from the first chamber 60 to the second chamber 62 through the four through-holes 58A, 58B, 580, 58D, as shown in FIG. 3. The speed of the piston 56 at the beginning of the compression of the damper 50 is of the order of 2 ms-1. Then, when the damper 50 is further compressed, the through holes 58A, 58B, 580, 58D are progressively closed off by the protuberance 64, starting with the first through hole 58A as shown in FIG. 4. In the embodiment of Figure 4, as the fluid flows from the first chamber 60 to the second chamber 62 through three through holes 58B, 580, 58D, the first passage 58A being closed, the piston speed 56 is of the order of 1.5 ms-1. The first and second through-holes 58A, 58B are then both closed by the protuberance 64 when the damper 50 is further compressed, the two other through-holes 580, 58D still allowing the circulation of the fluid of the first chamber 60 to the second chamber 62. The speed of the piston 56 is then of the order of 1 ms-1. In the embodiment of FIG. 5, the first, second and third through-holes 58A, 58B, 580 are closed off by the protuberance 64, only the fourth through-hole 58D still allows the circulation of the fluid of the first chamber 60 to the second chamber 62. The speed of the piston 56 is then of the order of 0.5 ms-1.
    [0012] Finally, as represented in FIG. 6, at the end of the compression of the damper 50, the four through-holes 58A, 58B, 580, 58D are plugged by the protrusion 64, thus preventing the flow of fluid between the first and second chambers. 60, 62, and the speed of the piston 56 is then zero. Each damper 50 exerts a damping force F throughout the opening stroke of each switch 12, the damping force F opposing the displacement of each rod 18 from the closed position to the position d opening, which then allows a regulation of the speed of movement of each rod 18 throughout the opening stroke. FIG. 7 illustrates a first curve 70 representing a first ratio equal to the damping force F divided by an internal pressure P of the damper 50, as a function of a second ratio equal to a stroke s of the piston 56 divided by a depreciation period t. This first curve 70 is characteristic of so-called linear dampers. The dampers are chosen according to the energy they are able to absorb. The dampers have operating ranges with values expressed in kilograms. This value, expressed in kilograms, corresponds to an effective mass representing the sum of the energies to be absorbed. In the example described, the damper has a range of 1.3 kg to 5.5 kg. The range of values of the damper used will be adapted according to the characteristics of the bulbs and the mechanism of the contactor 10. The first curve 70 then shows that the damping force F is well exerted throughout the opening stroke, and that it is greater than a minimum value Fmin over a very large part of this opening stroke, namely over more than three-quarters of the opening stroke, more preferably over 90 (3/0 of 8 shows a second curve 80 representing a speed V of the piston 56 as a function of the damping time T. The second curve 80 thus shows that the speed of the piston V decreases gradually over the course of the damping phase by the damper 50, as described previously with reference to FIGS. 3 to 6. In other words, the second curve 80 shows that, in the embodiment described, the regulation means 30 make it possible to decrease progressively ssivement the speed of opening or switches 12 throughout the opening stroke. The speed / displacement characteristics of the contactor 10 depend on the type of bulb used, the control mechanism and the dampers. In the example described, the speed at the beginning of the race is of the order of 0.35m.s-1, then decreases to 0 after 80m s. For the closure of the switch or switches 12, the second displacement member 22 is controlled to move each rod 18 along the arrow F2 in Figure 2. In the embodiment described, the actuator 42 then becomes active and exerts a force along the arrow F2, greater than that exerted by the spring 40 in the opposite direction, along the arrow F1, so that each rod 18 is moved from the open position of each switch 12 (Figure 2) to the closing position of each switch 12 (Figure 1). During the closing stroke of the switch or switches 12, the regulation means 30 do not act on the closing speed of the switch or switches 12. This regulation of the opening speed of each vacuum switch 12 throughout the opening stroke, in particular the limitation of the opening speed below the predetermined threshold, or even the progressive reduction of the opening speed, then makes it possible to obtain an opening speed of each vacuum switch 12 which is compatible with values recommended by the manufacturer of vacuum switches. These values are recommended by the manufacturer to limit the risk of damage to the vacuum switches 12 when they are opened, and compliance with this recommendation thus makes it possible to reduce the risk of malfunction of the vacuum interrupters 12 and to improve their service life. life. It is then conceivable that the contactor 10 according to the invention has a longer life than the contactor of the state of the art, reducing the risk of damaging the vacuum interrupter or switches 12.10.
    权利要求:
    Claims (12)
    [0001]
    CLAIMS1.- Contactor (10), comprising: - at least one vacuum switch (12), each having a fixed contact (14), a movable contact (16) and a rod (18) integral with the movable contact (16), the rod (18) being movable between a closed position of the switch (12) in which the movable contact (16) bears against the fixed contact (14) and an open position of the switch (12) in which the movable contact (16) is away from the fixed contact (14), - a first member (20) for moving each rod (18) in a direction of movement (X), from the closed position towards the open position, characterized in that it further comprises means (30) for regulating the speed of movement of each rod (18), throughout the movement of said rod (18) from the closed position to the open position.
    [0002]
    2. Contactor (10) according to claim 1, wherein the regulating means (30) are configured to limit the speed of movement at a speed below a predetermined threshold.
    [0003]
    3. Contactor (10) according to claim 1 or 2, wherein the regulating means (30) are configured to reduce the speed of movement of each rod (18), throughout the movement of said rod (18) from the closed position to the open position.
    [0004]
    4. A contactor (10) according to any one of the preceding claims, wherein the control means (30) are hydraulic control means.
    [0005]
    5. Contactor (10) according to claim 4, wherein the regulating means 30 (30) comprise at least one hydraulic damper (50).
    [0006]
    6. Contactor (10) according to claim 5, wherein the regulating means (30) comprise two hydraulic dampers (50). 25
    [0007]
    7. Contactor (10) according to any one of the preceding claims, wherein the contactor (10) further comprises a member (24) for guiding each rod (18) in the direction of displacement (X).
    [0008]
    8.- Contactor (10) according to claims 6 and 7, wherein the two hydraulic dampers (50) are arranged on either side of the guide member (24).
    [0009]
    9. A contactor (10) according to any one of claims 5, 6 and 8, wherein each hydraulic damper (50) comprises a piston (56) slidable inside a chamber (54) in a manner. sliding direction (X), the piston having a plurality of orifices (58A, 58B, 58C, 58D) for passing a fluid, said orifices (58A, 58B, 58C, 58D) being successively arranged in the direction of sliding (X).
    [0010]
    10. Contactor (10) according to any one of the preceding claims, wherein the contactor (10) further comprises a second member (22) for moving each rod (18) in the direction of displacement (X), since the open position to the closed position.
    [0011]
    11. A contactor (10) according to any one of the preceding claims, wherein the contactor (10) comprises a plurality of vacuum interrupters (12) and a member (26) for mechanical connection of the rods (18) of the switches, the first displacement member (20) being configured to move said link member (26) from the closed position to the open position, and the regulating means (30) being configured to regulate the speed of movement of the link (26), throughout the movement of the connecting member (26) and rods (18) from the closed position to the open position.
    [0012]
    12. Contactor (10) according to claims 7 and 11, wherein the guide member (24) is configured to guide the connecting member (26) in the direction of movement (X).
    类似技术:
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    同族专利:
    公开号 | 公开日
    EP3018685B1|2017-10-04|
    EP3018685A1|2016-05-11|
    JP2016103472A|2016-06-02|
    CN105590788B|2019-09-20|
    FR3028347B1|2018-03-30|
    CN105590788A|2016-05-18|
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    法律状态:
    2015-11-19| PLFP| Fee payment|Year of fee payment: 2 |
    2016-05-13| PLSC| Publication of the preliminary search report|Effective date: 20160513 |
    2016-11-18| PLFP| Fee payment|Year of fee payment: 3 |
    2017-11-21| PLFP| Fee payment|Year of fee payment: 4 |
    2018-02-02| CA| Change of address|Effective date: 20180103 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1460730A|FR3028347B1|2014-11-06|2014-11-06|CONTACTOR COMPRISING AT LEAST ONE VACUUM SWITCH AND MEANS FOR CONTROLLING THE OPENING SPEED OF EACH SWITCH|
    FR1460730|2014-11-06|FR1460730A| FR3028347B1|2014-11-06|2014-11-06|CONTACTOR COMPRISING AT LEAST ONE VACUUM SWITCH AND MEANS FOR CONTROLLING THE OPENING SPEED OF EACH SWITCH|
    EP15191169.0A| EP3018685B1|2014-11-06|2015-10-23|Contactor including at least one vacuum interrupter and means for regulating the opening speed of each interrupter|
    JP2015216727A| JP2016103472A|2014-11-06|2015-11-04|Contactor including at least one vacuum interrupter and means to adjust opening speed of each interrupter|
    CN201510768164.3A| CN105590788B|2014-11-06|2015-11-06|The component that the opening speed of contactor and each contact maker for being included to it is adjusted|
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