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  • 专利说明
  • 权利要求
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    • 专利摘要:
    SYSTEM AND NETWORK FOR TRANSMISSION AND DISTRIBUTION OF HIGH VOLTAGE DC POWER This invention relates to a system and method for continuing to supply power to subsea electrical equipment during an electrical cable failure. The system comprises: a power source side (32) for increasing a dc current level to a fixed dc voltage level; a load side (34), the source side (32) and the load side (34) each comprise a stacked modular direct current architecture and wherein the load side comprises an underwater load; a dc power transmission conductor (36); a dc power return conductor (38); a source-side grounding electrode (40); a charge-side grounding electrode (42); a pair of source-side switches (44, 46) associated with each conductor; and a pair of load-side switches (44, 46) associated with each conductor, where the power source side (32), the transmission and return conductors (36, 38) are configured together with the grounding electrodes corresponding (40, 42), source side switches (32) and load side switches (34) to enable a direct current earth path between the side (...).
    公开号:BR112013027423B1
    申请号:R112013027423-9
    申请日:2012-04-25
    公开日:2020-12-08
    发明作者:Christof Martin Sihler；Emad Ezzat Ahmed；Gorm Sande；Rainer Hoffmann；Simon Hebert Schramm
    申请人:Statoil Petroleum As；General Electric Campany；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION
    [001] This invention generally relates to the transport of electrical energy to subsea electrical equipment such as a motor that drives a compressor / pump located far from the shore, and more particularly to a system and method for continuing to supply power to subsea electrical equipment. during a defect in the electrical cable. BACKGROUND OF THE INVENTION
    [002] The transport of electricity to subsea electrical oil and gas equipment often requires that high power be transported over long distances. Transmission to subsea equipment is used to supply power from an onshore installation to a point where the energy is distributed between individual loads. Generally, a reducing transformer is implemented in order to bring the high voltage level from the transmission stage to a lower voltage level to a distribution stage for individual units of electrical equipment. Distribution distances are typically less than transmission distance; and the voltage levels to be supplied for the individual loads or groups of loads are less than the voltage levels of the transmission stage. Typically, power in the order of 50 megawatts is transmitted by high voltage alternating current (AC) transmission cables to a high voltage transformer, to then reduce the voltage to a medium voltage AC distribution system.
    [003] A commonly used nominal voltage is 132 kV (which is considered to be a high voltage for power transmission). Transmission voltages of + / 100 kV or greater are used in ATCC transmission projects where high power is transmitted over a long distance (for example, in the transmission of 100 MW or 200 MW over a distance of 100 or 200 km).
    [004] AC transmission provides technical challenges for applications where large amounts of energy are transmitted over long cables. The residual capacitance of the cable causes the charging current to flow along the length of the AC cable. Because the cable has to carry this current as well as the payload current, this physical limitation reduces the current carrying capacity of the cable. Because the capacitance is distributed over the entire length of the cable, longer lengths produce greater capacitances, thus resulting in higher charging currents.
    [005] Typically, multi-phase booster pumps require electrically driven motors that deliver shaft power between 2 MW and 6 MW. Future offshore oil and gas facilities will require pump installations over distances up to 50 km from the coast. These distances require a high voltage energy transmission; however, high voltage AC transmission is very expensive when supplying individual subsea pumps or groups of only a few subsea pumps, where the energy to be transmitted is at or below 20 MW.
    [006] Additionally, submarine engines that drive a gas compressor typically have a higher rated power (for example, in the order of 10 or 15 MW). As such, subsea compression groups may be required to transmit a total power of the order of 50 to 100 MW over a distance of 100 or 200 km. High power transmission over a distance of more than 100 km and distribution of subsea energy is very challenging with AC transmission and distribution systems due to the high charging currents and the large number of components involved in the distribution system.
    [007] In general, DC transmission can be performed more efficiently over long distances than AC transmission. High voltage DC (AT) transmission typically requires the use of electronic power converters in transmission systems that are capable of converting between ATCA and ATCC. Each converter switch for conventional ATCC converter topologies is designed to handle high voltages. The nominal voltage of the converter can vary from tens of kilovolts to hundreds of kilovolts, depending on the application. These switches are typically configured using a plurality of semiconductor devices connected in series (for example, such as isolated bridge bipolar transistors (IGBTs) and thyristors). Due to the size and large number of components involved, conventional ATCC terminals are not well suited for subsea installations.
    [008] Converters are also required on the load side of an energy distribution system when supplying variable speed motors in addition to the energy conversion required for ATCC transmission. Typically, a high voltage transformer is used to reduce the voltage from the AC or DC transmission level to the voltage level used in the AC power distribution system. On the load side of the distribution system, the converters convert energy from fixed frequency AC voltage (reduced from the transmission system) to variable frequency AC voltage from individual motors that have to be controllable over a wide range speed variation when operating subsea pumps or compressors.
    [009] Modular stacked DC converter architectures are well suited to subsea applications that require transmission and distribution over long distances. Unlike other DC transmission options, for example, where the DC transmission voltage (connection) is controlled, that is, kept almost constant, the DC transmission current (connection) is controlled in a stacked modular converter. An MECC 10 architecture is represented in Figure 1. The MECC architecture gets its name from the fact that the architecture uses several stacked and connected DC-DC converter modules in series, both at the transmission end and the receiving end of the transmission link as shown in Figure 1.
    [010] The transmission end / converters on the upper side 12 comprise a set of ac-dc converters 14, which pull energy from the mesh or network of ac 16. Each of these converters 14 is cascaded by a dc-converter dc 18. These dc-dc converters 18 are connected in series and are controlled to regulate the current in the dc cable 20 that connects the upper side 12 to the underwater installation 22. The receiving end / underwater side 22 also comprises several different converters cc-cc 19 connected in series. Each of these converters 19 is cascaded by a DC-AC motor inverter / controller 24. These DC-DC converters 19 are controlled to regulate the DC link voltage to that required by the downstream motor controller 24. Although the Figure 1 represents two-level converters used for the ac-cc, cc-cc and cc-ca converter modules, it should be understood that at high power levels, multilevel batteries will be used for these converter modules.
    [011] High voltage direct current transmission (ATCC) has technical and commercial advantages that increase with the distance of the power transmission. Submarine power transmission is always based on high voltage (AT) submarine cables and umbilicals. As the cable length increases, the probability of a cable defect increases. Repairing undersea cables is expensive and typically takes a long time, that is, months instead of weeks. In view of the above, there is a need to provide an ATCC transmission system that can be kept operational regardless of a transmission cable defect. DESCRIPTION OF THE INVENTION
    [012] An embodiment of the present invention comprises a high voltage direct current (dc) power transmission / distribution network that includes a power source side and a charging side. The network further comprises a dc power transmission cable, a dc power return cable, a source-side grounding electrode associated with each cable, a load-side grounding electrode associated with each cable, a pair of source-side disconnect switches associated with each cable, and a pair of load-side disconnect switches associated with each cable. The transmission and return cables are configured together with the corresponding grounding electrodes and disconnect switches to supply DC current continuously to the load side through an earth path during a cable fault, where the earth path is parallel and is in close proximity to the defective cable.
    [013] According to another embodiment, a high voltage direct current (ATCC) power distribution and transmission network comprises a system of sustained operation during cable fault configured to enable a direct current earth transmission path and subsequently isolate a defective transmission cable from the ATCC network in order to enable the direct current transmission earth path so that the ATCC network remains operational during a transmission cable defect. The ATCC network according to one embodiment is devoid of and operates in the absence of a neutral bus. The ATCC network according to another embodiment is also devoid of and operates in the absence of DC circuit breakers.
    [014] According to yet another embodiment, a high voltage direct current (ATCC) power transmission system comprises a sustained operating structure during cable defect without a neutral bus and is configured to ensure that the transmission system ATCC power supply remains operational via an earth path during a transmission cable defect. Another embodiment comprises a sustained operating structure during cable defect devoid of dc circuit breakers and is configured to ensure that the ATCC power transmission system remains operational via an earth path during a transmission cable defect. BRIEF DESCRIPTION OF THE DRAWINGS
    [015] The characteristics, realizations and advantages of the invention and others are evident from the detailed description below taken in conjunction with the attached drawings in which similar characters represent similar parts across all drawings, in which: Figure 1 is a simplified diagram illustrating a high voltage dc power transmission / distribution system (ATCC) with modular power converter building blocks stacked both on the land and underwater side of the system according to an embodiment of the invention; Figure 2 illustrates the ATCC system shown in Figure 1 which is now operating at full power and maximum dc transmission voltage through a ground path during a dc transmission cable failure; Figure 3 illustrates the ATCC system shown in Figure 1 which is now operating at full power and at a reduced dc transmission voltage through a ground path during a dc transmission cable failure; Figure 4 illustrates the ATCC system represented in Figure 1 that is now operating at reduced power and reduced dc transmission voltage through a ground path during a dc transmission cable defect; Figure 5 is a simplified diagram illustrating an ATCC power transmission / distribution system with modular power converter building blocks stacked on both the land side and the underside of the system according to another embodiment of the invention; Figure 6 is a set of graphs that illustrate operational parameters during fault-free starting conditions for a group of electrical loads for carrying out a simulated ATCC transmission / distribution system; and Figure 7 is a set of graphs illustrating operational parameters before, during, and subsequent to a cable defect for the group of electrical loads represented in Figure 6 for a simulated ATCC transmission / distribution system that employs principles of sustained operation during cable defect according to one embodiment.
    [016] Although the figures in the drawings identified above have alternative embodiments, other embodiments of the present invention are also contemplated, as noted in the discussion. In all cases, this invention features embodiments illustrated by way of representation and not limitation. Various other modifications and realizations can be envisioned by those skilled in the art within the scope of the principles of this invention. DESCRIPTION OF ACCOMPLISHMENTS OF THE INVENTION
    [017] A general advantage of the stacked modular direct current (MECC) topology represented in Figures 1 to 4 described in further details in this document is that the transmission voltage is not controlled and can be determined to be any value below the maximum operating voltage . Only the ring current of this topology of converters connected in series is controlled, unlike conventional ATCC systems.
    [018] The present inventors have recognized that this twin-cable controlled DC current system can be configured to provide an ATCC transmission / distribution network capable of supporting the operation of electrical equipment so that, without limitation, a submarine engine that drives a compressor / pump located far from the coast, even during a defect in the electrical transmission cable.
    [019] According to an embodiment illustrated in Figure 2, a high voltage direct current (dc) power transmission / distribution network 30 comprises a power source side 32 and a load side 34. Network 30 comprises additionally a 36 dc power transmission conductor, a 38 dc energy return conductor (both typically integrated into a submarine dc cable), a source side earthing electrode 40 associated with each cable 36, 38, a load-side earthing electrode 42 associated with each cable 36, 38, a pair of source-side disconnect switches 44, 46 associated with each cable 36, 38, and a pair of charge-side disconnect switches 44, 46 associated with each cable 36, 38. Transmission and return cables 36, 38 are configured together with the corresponding grounding electrodes 40, 42 and disconnect switches 44, 46 to supply DC current continuously to the load side 34 through a path of having ra 48 during a cable defect, where the earth path 48 is parallel and is in close proximity to the defective cable. The ATCC transmission / distribution system grounding electrodes suitable for use to implement the achievements described in this document are well known, and therefore, additional details with respect to these grounding electrodes are not described in this document to preserve brevity and improve the clarity regarding the understanding of the principles presented in this document.
    [020] More specifically, instead of employing an inverter switch such as that employed in a conventional ATCC transmission / distribution system, the ATCC transmission / distribution system 30 employs two separate disconnectors 44, 46 at each end of the cable / grounding electrode 40, 42. When a defect in the cable is detected, for example, by detecting a current in the ground resistance R0 50, one of the disconnectors 44 at each end of the defective cable, which are configured together with a corresponding disconnector 46 as a grounding switch with closing control at each end, is closed instantly to enable current flow through earth path 48. Proper switching closing times can be accomplished in less than 20 msec using device commercially available switchgear. In this way, a parallel path of dc current is enabled, bypassing the defective cable. For a period of time following the closing of switches 44, the defective cable and the ground share the dc current. Following the closing of switches 44, the corresponding switches 46 at each end of the defective cable are opened, fully switching the dc current to earth path 48 and isolating the defective cable.
    [021] The above switching process advantageously does not require the use of a DC circuit breaker since the current is switched to a low resistivity parallel path through the earth. It is notable that the high voltage direct current (dc) power transmission / distribution network 30 does not employ a neutral bus with grounding electrodes when bypassing a defective cable. The above switching process additionally advantageously allows a service team to have access to the defective cable and repair or replace the defective cable section. During the repair / replacement process, the dc power transmission can remain in operation with a cable now operating at ground potential without negatively impacting the operation of electrical loads such as submarine engines. The transmission / replacement system 30, for example, continues in an embodiment to operate without the use of the upper transmission cable 36 where the lower return cable 38 now operates at -60 kilovolts (kV).
    [022] Figure 3 illustrates the ATCC 30 system represented in Figure 2 which is now operating at full power and at a reduced dc transmission voltage of -40 kV through the ground path 48 during a defect in the dc transmission cable ; while Figure 4 illustrates the ATCC 30 system represented in Figure 2 which is now operating at reduced power and a reduced dc transmission voltage of -30 kV through ground path 48 during a defect in the transmission cable of cc.
    [023] The present inventors have recognized that increasing the transmission current to maintain system operation despite a transmission cable defect is possible since systems such as MECC transmission systems typically have a thermal margin. The cross section of the dc transmission cable 36, 38 is determined by the acceptable voltage drop, that is, ohmic loss, rather than by thermal limits. Therefore, operation at rated power can continue without having to exceed a desired operating voltage such as 40 kV shown in Figure 3 for an accomplishment. A particular advantage of an MECC control and protection system implemented in accordance with the principles described in this document is that high dc fault currents cannot occur in this current controlled transmission topology. Therefore, low-cost disconnectors and a comparatively low-cost electrode grounding structure can be used at the converter terminals.
    [024] Figure 5 is a simplified diagram illustrating a high voltage dc power transmission / distribution system 70 with modular power converter building blocks stacked on both the land side 32 and the underside 34 of the power system. according to another embodiment of the invention. It can be seen that the ATCC 70 system is devoid of both DC circuit breakers and any neutral busbars since the principles of operation do not require these characteristics. The ATCC 70 system operates similarly to that described in this document with reference to Figures 1 to 4. Switches 72 and 74 operate if a ground fault occurs with the transmission cable 36; while switches 76 and 78 operate if a ground fault occurs with return cable 38. Each switch 72 to 78 comprises two separate disconnectors configured as a ground switch with closing control at each end of the cable / ground electrode 40 , 42. When a defect in the cable is detected, for example, by detecting a current in the ground resistance R0 50, one of the switch disconnectors at each end of the defective cable is closed instantly to enable current flow through the dirt path. For a period of time following the closing of the first set of switch disconnectors, the defective cable and ground are shared by the dc current. after closing the first set of switch disconnectors, a second disconnector at each end of the defective cable is opened, completely switching the dc current to the earth path and isolating the defective cable.
    [025] High-power grounding electrodes are expensive. They must be designed to enable a low impedance current path to earth in a salt water / earth environment and to avoid electromechanical reactions, for example, corrosion. An advantage of the topology shown in Figure 5 is that only two grounding electrodes are required, one on the upper side and one on the underside of the DC power transmission system.
    [026] Another way to achieve acceptable costs for the grounding electrodes shown in Figures 1 to 5 is to design them for only a limited period of operation, for example, eight weeks. Its design life may be limited to the period (s) of time required to repair a defective submarine cable. The earth electrodes have to provide only a low impedance current path to earth if a defect in the cable has occurred that has not yet been repaired. This is different from a conventional monopolar AV DC current transmission application where ground electrodes are extremely expensive because they have to be designed to enable a low impedance current path to earth for more than 10 years.
    [027] In the summary explanation, the achievements of a high voltage direct current transmission / distribution network have been described in this document including a power source side 32 and a load side 34. Network 30, 70 further comprises a dc power transmission cable 36, a dc power transmission return cable 38, at least one source side grounding electrode 40, at least one charge side grounding electrode 42, a pair of switches source side disconnect switch 44, 46 associated with each cable 36, 38, and a pair of load side disconnect switches 44, 46 associated with each cable 36, 38. transmit and return cables 36, 38 are configured together with the corresponding grounding electrodes 40, 42 and disconnect switches 44, 46 to supply dc current to the load side 34 continuously through an earth path 48 during a cable fault, where the earth path 48 it's stop it and is in close proximity to the defective cable. The use of dirt paths is familiar to and known to those skilled in the art of ATCC transmission / distribution systems, and therefore, further details regarding these dirt paths are not described in this document to preserve brevity and improve clarity. regarding the understanding of the principles presented in this document.
    [028] Figure 6 is a set of graphs that illustrate operational parameters during fault-free start conditions for a group of electrical loads for a simulated ATCC transmission / distribution system. The three graphs on the left side of Figure 6 represent the power of the transmission system, voltage of the transmission system and current of the transmission system respectively. The three graphs on the right side of Figure 6 represent the power of the charge motor, charge motor speed and air gap torque of the charge motor respectively and show that operational stability is achieved in approximately eight seconds from the start. A real start should be performed in minutes, rather than seconds, with much lower acceleration rates, but this is not relevant for the simulation results.
    [029] Figure 7 is a set of graphs that illustrate the operational parameters before, during, and subsequent to a cable defect for the group of electrical loads represented in Figure 6 for a simulated ATCC transmission / distribution system that employs principles of sustained operation during the defect in the cable according to one embodiment. Although a defect in the cable through, for example, an arc can be difficult to detect in the current or voltage, for example, 600 km cable, ~ 42 Ohms, during the initial stage of the defect, this defect will contact the voltage potential in the location of the defect to the grounding resistance 50 shown in Figures 2 and 5, assuming a low resistance through water / earth or approximate knowledge of this resistivity. This voltage drop or current flow in the grounding resistor can be used to trigger sustained operation in the cable fault by contacting grounding electrodes 40, 42 and increasing the transmission current to keep the system active as shown in Figure 7 According to one embodiment, the grounding resistor 50 is installed on the ground. According to another embodiment, the grounding resistance has a value greater than approximately 10 kOhms. According to yet another embodiment, the voltage drop along the grounding resistance can be used to determine the location of the defect.
    [030] While the principles of sustained operation in the cable defect described in this document may not be suitable for permanent ATCC power transmission / distribution applications, they are particularly useful for maintaining the operation of the ATCC transmission / distribution system for periods time to repair and / or replace defective ATCC cables. Since repairing an underwater cable, for example, typically requires a long period of time, that is, weeks instead of days, it is especially advantageous to implement an ATCC transmission system that can be kept operating despite a cable defect. transmission.
    [031] Although not obvious from the Figures, in some cases underwater loads can be tens of kilometers away from each other and connected by a dc cable. The four (4) underwater loads represented in Figure 1, for example, can be tens of kilometers apart and interconnected by a dc cable of significant length. In this embodiment, the technology and operating principles sustained by the cable defect described in this document can also be applied to achieve the desired results. Therefore, the technology of operation sustained in the cable defect is applied within the subsea distribution system (meaning between individual loads that are remote to each other).
    [032] Although only certain features of the invention have been illustrated and described in this document, many modifications and changes will take place for those skilled in the art. Therefore, it should be understood that the appended claims are intended to cover all these modifications and changes as being within the real scope of the invention.
    权利要求:
    Claims (18)
    [0001]
    1. HIGH VOLTAGE DC POWER TRANSMISSION AND DISTRIBUTION SYSTEM, the system comprising: a power source side (32) to increase a dc current level to a fixed dc voltage level; a load side (34), the source side (32) and the load side (34) each comprise a stacked modular direct current architecture, the system being characterized by the load side (34) comprising a plurality of loads underwater; a dc power transmission conductor (36); a dc power return conductor (38); a source-side grounding electrode (40); a charge-side grounding electrode (42); a pair of source-side switches (44, 46) associated with each conductor; and a pair of load-side switches (44, 46) associated with each conductor, where the power source side (32), the transmission and return conductors (36, 38) are configured together with the grounding electrodes corresponding (40, 42), source side switches (32) and load side switches (34) to enable a direct current earth path between the power source side (32) and the load side (34) ), and subsequently increase without interruption, a level of direct current transmitted at a fixed level of direct voltage from the power source side (32) to the load side (34) through the direct current earth path for a defect in the dc power transmission conductor (36) or in the dc power return conductor (38), where the direct current earth path is parallel to and in close proximity to the defective conductor.
    [0002]
    2. ENERGY TRANSMISSION AND DISTRIBUTION SYSTEM, according to claim 1, characterized in that it additionally comprises a grounding resistance (50) configured to provide a voltage drop sufficient to determine a location of the cable defect associated with the system.
    [0003]
    3. ENERGY TRANSMISSION AND DISTRIBUTION SYSTEM, according to claim 2, characterized by the grounding resistance (50) having a value greater than 10 kOhms.
    [0004]
    4. ENERGY TRANSMISSION AND DISTRIBUTION SYSTEM, according to claim 1, characterized in that it additionally comprises two or more grounding resistors (50) configured to provide a current flow sufficient to determine a location of the defect in the cable associated with the system .
    [0005]
    5. ENERGY TRANSMISSION AND DISTRIBUTION SYSTEM, according to any one of claims 3 to 4, characterized in that at least one earthing resistance (50) has a value greater than 10 kOhms.
    [0006]
    6. ENERGY TRANSMISSION AND DISTRIBUTION SYSTEM, according to claim 1, characterized in that the pair of switches on the source side (44, 46) and switches on the load side (44, 46) are associated with each of the conductors and be configured together to enable dc current sharing between a defective conductor and the earth path before isolating the defective conductor from the system.
    [0007]
    7. ENERGY TRANSMISSION AND DISTRIBUTION SYSTEM, according to claim 1, characterized by the source side comprising energy generation from renewable energy sources.
    [0008]
    8. POWER TRANSMISSION AND DISTRIBUTION SYSTEM, according to claim 1, characterized in that the transmission and return conductors (36, 38) are additionally configured together with the corresponding grounding electrodes (40, 42), switches on the source side (44, 46) and load side switches (44, 46) to isolate the defective conductor from the subsequent system to enable the earth path.
    [0009]
    9. ENERGY TRANSMISSION AND DISTRIBUTION SYSTEM, according to claim 1, characterized by the dc power transmission cable being greater than 200 km in length.
    [0010]
    10. HIGH VOLTAGE DC POWER DISTRIBUTION AND TRANSMISSION NETWORK comprising: one power source side (32) to increase a dc current level to a fixed dc voltage level; a load side (34), the source side (32) and the load side (34) each comprise a stacked modular direct current architecture, the system being characterized by the load side (34) comprising a plurality of loads underwater; a dc power transmission conductor (36); a dc power return conductor (38); a system of sustained operation during cable failure configured to enable a direct current earth transmission path from the power source side (32) to the load side (34), and subsequently isolate a power transmission conductor defective dc (36) or a defective dc (38) power return conductor between dc power (38) return and dc power transmission (36) conductors from the network in order to enable the direct current transmission earth, so that a level of direct current transmitted to the load side (34) at a fixed level of direct voltage is increased to a fixed voltage level without interruption during a failure in the power transmission conductor dc (36) or dc power return conductor (38), wherein the system of operation sustained during cable defect comprises: a pair of first switches (44, 46) associated with a defective first end of the cable; a pair of second switches associated with a second end of the defective cable, in which a first switch and a second switch are configured to enable the direct current transmission earth path no more than 20 ms after a first occurrence of the fault in the cable, and also in that the first remaining switch and the second remaining switch are configured to disable the faulty network cable no more than 100 ms after enabling the direct current transmission earth path.
    [0011]
    11. ENERGY DISTRIBUTION AND TRANSMISSION NETWORK, according to claim 10, characterized in that it additionally comprises a grounding resistor (50) configured to provide a voltage drop sufficient to determine a fault location in the cable associated with the network.
    [0012]
    12. ENERGY DISTRIBUTION AND TRANSMISSION NETWORK, according to claim 11, characterized by the grounding resistance (50) having a value greater than 10 kOhms.
    [0013]
    13. ENERGY DISTRIBUTION AND TRANSMISSION NETWORK, according to claim 10, characterized in that it additionally comprises two or more grounding resistors (50) configured to provide a current flow sufficient to determine a location of the defect in the cable associated with the system .
    [0014]
    14. ENERGY DISTRIBUTION AND TRANSMISSION NETWORK, according to claim 13, characterized by at least one earthing resistance (50) having a value greater than 10 kOhms.
    [0015]
    15. ENERGY DISTRIBUTION AND TRANSMISSION NETWORK, according to claim 10, characterized by the direct current transmission earth path comprising a pair of grounding electrodes configured to provide a large parallel current transmission earth path proximity to the defective transmission cable.
    [0016]
    16. ENERGY DISTRIBUTION AND TRANSMISSION NETWORK, according to claim 10, characterized by the defective transmission cable being more than 200 km in length.
    [0017]
    17. ENERGY DISTRIBUTION AND TRANSMISSION NETWORK, according to claim 10, characterized in that the system of sustained operation during defect in the cable comprises no more than one grounding electrode on each of the power transmission side and the distribution side from the Web.
    [0018]
    18. ENERGY DISTRIBUTION AND TRANSMISSION NETWORK, according to claim 10, characterized by the sustained operation system during cable defect being devoid of dc circuit breakers.
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    同族专利:
    公开号 | 公开日
    WO2012146621A2|2012-11-01|
    WO2012146621A3|2013-08-22|
    US20120268099A1|2012-10-25|
    US8743514B2|2014-06-03|
    BR112013027423A2|2017-01-31|
    BR112013027423B8|2020-12-22|
    EP2702660A2|2014-03-05|
    AU2012247541A1|2013-11-07|
    AU2012247541B2|2016-05-26|
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    法律状态:
    2018-12-18| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-08-20| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-04-07| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|
    2020-08-25| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-12-08| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 25/04/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    2020-12-22| B16C| Correction of notification of the grant [chapter 16.3 patent gazette]|Free format text: REF. RPI 2605 DE 08/12/2020 QUANTO AO INVENTOR. |
    优先权:
    申请号 | 申请日 | 专利标题
    US13/093,058|US8743514B2|2011-04-25|2011-04-25|HVDC power transmission with cable fault ride-through capability|
    US13/093,058|2011-04-25|
    PCT/EP2012/057573|WO2012146621A2|2011-04-25|2012-04-25|Hvdc power transmission with cable fault ride-through capability|
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