CN105245017A - Live monitoring method and system for high-voltage DC power transmission line - Google Patents
Live monitoring method and system for high-voltage DC power transmission line Download PDFInfo
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- CN105245017A CN105245017A CN201510816243.7A CN201510816243A CN105245017A CN 105245017 A CN105245017 A CN 105245017A CN 201510816243 A CN201510816243 A CN 201510816243A CN 105245017 A CN105245017 A CN 105245017A
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Abstract
The invention relates to a live monitoring method and a system for a high-voltage DC power transmission line. The method is characterized by comprising steps: 1) a line live monitoring system in the case of outage is built, 35kV voltage is loaded to the original power transmission line in the case of outage, the power transmission line can still operate lively in the outage period, the power transmission line can play a role of theft prevention, and the system after AC voltage loaded can operate stably in a no-load mode; 2) when a fault or an accident happens to the power transmission line, on one hand, voltage and current measurement data of the power transmission line are analyzed via a fault location system for fault location, and on the other hand, a protection tripping system of the power transmission line is started, the line is tripped, and the power transmission line is protected; and 3) in the case of outage of the power transmission line, a power supply for an AC station in a converter station is used for charging the positive electrode, the negative electrode and the grounding electrode of the power transmission line. Through building the line live monitoring system in the case of outage, the line can be monitored in real time, line facilities can be prevented from being stolen, overhaul and maintenance are convenient, and the management efficiency is high.
Description
Technical field
The present invention relates to a kind of live monitoring method and system of high-voltage dc transmission power transmission sequence.Belong to DC engineering high-tension line monitoring equipment technical field.
Background technology
DC engineering is applied to long distance, powerful transmission of electricity situation usually, is more common at home and the electric energy of western power center of China as large hydropower station or Large-scale Coal Energy Base power plant is directly delivered to energy-consuming center, east.When power center's electric energy is at a low ebb, as hydroelectric station be in dry season or few water phase time, the refreshment period that DC converter station may be in the power transmission cycle stops power supply.The multinational DC networking project in the Central Asia built as being about to, DC converter stands in the annual wet season and works 5 months, 7 months not power transmissions of resting and reorganizing dry season.Within the refreshment period, line outage, system is out of service, but still needs to safeguard circuit, monitor and manage.Because circuit distribution is larger, more difficult to line upkeep, monitoring and management work, and be difficult to Real-Time Monitoring.In addition, when circuit is not charged, line facility and equipment may be stolen.
In prior art, DC engineering circuit does not all have charged anti theft design, and the O&M of circuit, usually by the regular line walking of staff of run unit, checks every base tower and conductor.Regular maintenance usually rely on employ local resident as part-time line attendant take pictures check and report.Although work of patrolling and examining this is effective, but still there is following problem:
(1) patrol and examine a large amount of human cost of needs and time, and can only make regular check on, the very first time solves at the scene to have problem not ensure, all intact fault-free and broken string etc. when can not guarantee that circuit is per.
(2) problems such as part-time line attendant is generally layman, and the problem occurred for circuit does not have very high vigilance, may there is report not in time yet, inaccurate.
Summary of the invention
An object of the present invention, being to solve DC engineering line upkeep between the refreshment period, monitoring and difficult management, the problem that line facility and equipment are easily stolen, providing a kind of live monitoring method of high-voltage dc transmission power transmission sequence.
Object two of the present invention, being to solve DC engineering line upkeep between the refreshment period, monitoring and difficult management, the problem that line facility and equipment are easily stolen, providing a kind of live monitoring system of high-voltage dc transmission power transmission sequence.
An object of the present invention reaches by following technical scheme:
The live monitoring method of high-voltage dc transmission power transmission sequence, is characterized in that:
1) a circuit live monitoring system during stoppage in transit is set up, on former transportion wire road, 35kV voltage is loaded during by stopping transport, make transportion wire road still charging operation during stopping transport, to make described transportion wire road play anti-theft function, and after enabling loading alternating voltage, system stablizes no-load running;
2) when break down in transportion wire road or accident time, on the one hand by fault localization system, the voltage on transportion wire road, the measurement data of electric current are carried out to analysis and are done fault location; Start the trip protection system on transportion wire road on the other hand, tripping circuit, to realize protecting transportion wire road.
3), when stop transport in transportion wire road, utilize Exchange Station power supply in current conversion station to the positive pole on transportion wire road, negative pole, ground connection charging.
An object of the present invention also reaches by following technical scheme:
Further, during stopping transport, transportion wire road keeps unloaded charging operation; The one-sided charging of both-end direct current system, multiterminal and other then charge according to line sectionalizing; In order to realize preventing overhead line structures or wire from being stolen, need circuit retainer belt within the refreshment period electric but zero load.Ground electrode circuit needs charged equally.
Further, utilize the side dress current measuring device on transportion wire road, current measurement value is delivered to backstage, connects trip protection system and fault localization system.
Further, the station electrical interconnection system of current conversion station is utilized to carry out Long-distance Control and automatic switching; System can realize a distant place and control, and realizes the switching from normal power transmission to charged anti-theft modes.
Two of object of the present invention reaches by following technical scheme:
The live monitoring system of high-voltage dc transmission power transmission sequence, comprise supply unit, reactive power compensator, monitoring and protecting device and spacer assembly, its design feature is: supply unit comprises 10KV/35KV step-up transformer, 35KV circuit breaker and 35KV isolating transformer, the input that input connects 10KV system, output connects spacer assembly of supply unit, reactive power compensator is arranged on the 35KV bus of supply unit, forms the capacitive reactive power collocation structure to nonloaded line, monitoring and protecting device has several detection signal inputs and at least one control output end, the detection signal input of monitoring and protecting device connects the equipment along the line of high-voltage dc transmission power transmission sequence, namely the equipment along the line of high-voltage dc transmission power transmission sequence is monitored by described detection signal input, form the detection to line fault and location structure, the control signal output of monitoring and protecting device connects the control signal input of spacer assembly, the signal output part of spacer assembly is connected on 500KV/800KV circuit, form the fault trip control structure of the equipment along the line of high-voltage dc transmission power transmission sequence, to protect monitoring burglary-resisting system equipment.
Two of object of the present invention reaches by following technical scheme:
Further, supply unit comprises 10kV switch cubicle, 10kV circuit breaker, 10kV current transformer, 35kV switch cubicle, 10kV/35kV transformer, 35kV circuit breaker, 35kV isolating switch and 35kV isolating transformer; Spacer assembly comprises 35kV current transformer, 35kV circuit breaker, 35kV isolating switch, neutral line isolation switch and high voltage isolator; Reactive power compensator comprises 35kV isolating switch, 35kV circuit breaker and 35kV compensation reactor; Monitoring and protecting device comprises secondary cable, route survey structure-preserving, fault localization structure and current measure structure; High-voltage dc transmission electric wire connects shielding system 35kV cable by high voltage isolator, and the outlet of current conversion station earth electrode connects shielding system 35kV cable by neutral line isolation switch; Monitoring and protecting system is by secondary cable access shielding system 35kV current transformer; Transformer station is by 10kV system power supply through 10kV/35kV transformer boost access power-supply system, and the outlet of power-supply system 35kV isolating transformer connects shielding system; Reactive compensation system is through 35kV bus access power-supply system.
Further, described current measure structure is arranged on high-voltage dc transmission electric wire, plays the effect of monitoring circuit; Monitoring and protecting system possesses fault localization structure and line protective structure, and the fault current data-triggered line protective structure recorded by current measuring device realizes the protection of transportion wire road.
Further, described fault localization function, by after fault current data-triggered, calculates the position of fault origination point according to fault current data; Described route protection function, by after fault current data-triggered, controls the 35KV circuit breaker of shielding system, the relevant connection of deenergization system and shielding system automatically.
Further, the high voltage isolator of shielding system is arranged near the outlet of DC engineering high voltage transmission line; Neutral line isolation switch is arranged near earth electrode outlet.
Further, described reactive compensation system is that circuit no-load running causes the capacitive reactive power in 35kV isolating transformer loop to carry out reactive power compensation, and compensation capacity is by calculating, and every 100km circuit supplements capacity and is about 200kVar.
The present invention has following outstanding beneficial effect:
1, the present invention is by setting up a circuit live monitoring system during stoppage in transit, on former transportion wire road, 35kV voltage is loaded during by stopping transport, make transportion wire road still charging operation during stopping transport, to make described transportion wire road play anti-theft function, and after enabling loading alternating voltage, system stablizes no-load running; When transportion wire road break down or accident time, on the one hand by fault localization system, the voltage on transportion wire road, the measurement data of electric current are carried out to analysis and are done fault location; Start the trip protection system on transportion wire road on the other hand, tripping circuit, to realize protecting transportion wire road; Therefore, DC engineering line upkeep between the refreshment period, monitoring and difficult management can be solved, the problem that line facility and equipment are easily stolen, have and Real-Time Monitoring realized to circuit, have an accident or fault time can Timeliness coverage locating, obtain stable more reliable monitoring information, save the input of manpower, effectively prevent line facility from being stolen, inspection and maintenance is convenient, and efficiency of management height waits beneficial effect.
The live monitoring system of the high-voltage dc transmission power transmission sequence that 2, the present invention relates to, can realize long-range throwing and move back, more safe and reliable; System can be used for both-end or MTDC transmission system, applied widely, safe and reliable.Unique apparatus arrangement general layout, makes full use of the space that transformer station is limited, rational advancing equipment and distribution, while taking into full account fail safe, sets up multiple equipment and does not show crowded.
Accompanying drawing explanation
Fig. 1 is the winding diagram of reactive compensation system of the present invention and power-supply system.
Fig. 2 is the winding diagram of shielding system and monitoring and protecting system.
Embodiment
Specific embodiment 1
With reference to Fig. 1, Fig. 2, the live monitoring system of the high-voltage dc transmission power transmission sequence that this enforcement relates to, comprise supply unit 101, reactive power compensator 102, monitoring and protecting device 103 and spacer assembly 104, supply unit 101 comprises 10KV/35KV step-up transformer, 35KV circuit breaker and 35KV isolating transformer, the input that input connects 10KV system, output connects spacer assembly 104 of supply unit 101, reactive power compensator 102 is arranged on the 35KV bus of supply unit 101, forms the capacitive reactive power collocation structure to nonloaded line, monitoring and protecting device 103 has several detection signal inputs and at least one control output end, the detection signal input of monitoring and protecting device 103 connects the equipment along the line of high-voltage dc transmission power transmission sequence, namely the equipment along the line of high-voltage dc transmission power transmission sequence is monitored by described detection signal input, form the detection to line fault and location structure, the control signal output of monitoring and protecting device 103 connects the control signal input of spacer assembly 104, the signal output part of spacer assembly 104 is connected on 500KV/800KV circuit, form the fault trip control structure of the equipment along the line of high-voltage dc transmission power transmission sequence, to protect monitoring burglary-resisting system equipment.
In the present embodiment:
Supply unit 101 comprises 10kV switch cubicle 1,10kV circuit breaker 2,10kV current transformer 3,35kV switch cubicle 4,10kV/35kV transformer 6,35kV circuit breaker 7,35kV isolating switch 8 and 35kV isolating transformer 9; Spacer assembly 104 comprises 35kV current transformer 10,35kV circuit breaker 7,35kV isolating switch 8, neutral line isolation switch 11 and high voltage isolator 12; Reactive power compensator 102 comprises 35kV isolating switch 8,35kV circuit breaker 7 and 35kV compensation reactor 13; Monitoring and protecting device 103 comprises secondary cable 14, route survey structure-preserving 15, fault localization structure 16 and current measure structure 17; High-voltage dc transmission electric wire connects shielding system 35kV cable 5 by high voltage isolator 12, and the outlet of current conversion station earth electrode connects shielding system 35kV cable 5 by neutral line isolation switch 11; Monitoring and protecting system 4 accesses shielding system 35kV current transformer 10 by secondary cable 14; Transformer station's 10kV system power supply connects shielding system 2 through the outlet of 10kV/35kV transformer 6 boosting access power-supply system 1, power-supply system 135kV isolating transformer 9; Reactive compensation system 3 accesses power-supply system 1 through 35kV bus 19.
Described current measure structure 17 is arranged on high-voltage dc transmission electric wire, plays the effect of monitoring circuit; Monitoring and protecting system 103 possesses fault localization structure and line protective structure, and the fault current data-triggered line protective structure recorded by current measuring device 17 realizes the protection of transportion wire road.
Described fault localization function, by after fault current data-triggered, calculates the position of fault origination point according to fault current data; Described route protection function, by after fault current data-triggered, controls the 35KV circuit breaker 7 of shielding system (104) automatically, the relevant connection of deenergization system 101 and shielding system 104.
Because the equipment that the present invention relates to is more, Substation Station institute limited space, rational method for arranging, the fail safe run equipment and the convenience of management have considerable influence, arrange object that is succinct and safe operation for reaching between each equipment, the present invention Substation Station layout as follows:
The high voltage isolator 12 of shielding system 104 is arranged near the outlet of DC engineering high voltage transmission line; Neutral line isolation switch 11 is arranged near earth electrode outlet.
Described reactive compensation system 102 causes the capacitive reactive power in 35kV isolating transformer 9 loop to carry out reactive power compensation for circuit no-load running, and compensation capacity is by calculating, and every 100km circuit supplements capacity and is about 200kVar.
35kV circuit breaker 7,35kV isolating switch 8 and 35kV current transformer 10 are contained in 35kV switch cubicle 4; 10kV circuit breaker 2,10kV current transformer 3 are contained in 10kV switch cubicle 1; 35kV switch cubicle 4 and 10kV switch cubicle 1 are arranged on transforming plant indoor.
35kV compensation reactor 13,10kV/35kV transformer 6,35kV isolating transformer 9 semi-outdoor are arranged in side, electricity consumption room, station, and be connected with indoor equipment by cable, 35kV cable 5 and other secondary cables 14 lay in cable trough.
The high voltage isolator 12 of shielding system 104 is arranged near the outlet of DC engineering high voltage transmission line; Neutral line isolation switch 11 is arranged near earth electrode outlet.
Route survey protective device 15 and fault location device 16 are contained in screen cabinet 18, and screen cabinet 18 is arranged in control room, master control building, is convenient to the monitor management of keeper to system, and energy Timeliness coverage during line failure also processes.
Arrangement of the present invention has taken into full account the convenience of equipment safety in operation and use, can ensure that while not taking too much Substation Station institute space each equipment can adapt to the environment run, orderly method for arranging, make work of transformer substation person more easily be familiar with equipment, be convenient to administering and maintaining system.
Obtained through 10/35kV transformer boost by transformer station's 10kV system with reference to Fig. 1, power-supply system 10135kV voltage, power-supply system 10135kV voltage is through isolating transformer Safety output, and isolating transformer outlet correspondence accesses shielding system 104.
With reference to Fig. 2, shielding system 10435kV current transformer 10,35kV circuit breaker 7,35kV isolating switch 8 and 35kV single-core cable are connected in series successively, DC engineering high voltage transmission line is connected with shielding system 10435kV single-core cable by high voltage isolator 12, and earth electrode outlet is connected with 35kV single-core cable by neutral line isolation switch 11.
Due to the no-load running in DC engineering high voltage transmission line of 35kV voltage, it is idle that isolating transformer loop can produce honor, and for compensating the capacitive reactive power in isolating transformer loop, the present invention is configured with reactive compensation system 102.With reference to Fig. 1, in described reactive compensation system 102, compensation reactor is capacitive reactive power compensation arrangement, accesses power-supply system 101 through 35kV bus 19, and its compensation capacity is by calculating, and every 100km circuit supplements capacity and is about 200kvar.
With reference to Fig. 2; the route survey protective device 15 of monitoring and protecting system 103 and fault location device 16 access the 35kV current transformer 10 of shielding system 104 by secondary cable 14; and current measuring device 17 is arranged on DC engineering high voltage transmission line side, play the effect of monitoring circuit.After native system puts into operation, if line failure, the fault current data recorded are sent to monitoring and protecting system 103 by current measuring device 17, and the fault location device 16 of monitoring and protecting system 103 calculates the position of fault origination point according to the fault current data received; Route survey protective device 15 is then by fault current data-triggered; the 35kV circuit breaker 7 of automatic control shielding system 104; realize fault trip; the relevant connection of deenergization system 101 and shielding system 104; insulation blocking is carried out to each equipment of monitoring system, thus guarantees the safe operation of system equipment.
The live monitoring method of the high-voltage dc transmission power transmission sequence that the present embodiment relates to, is characterized in that:
1) a circuit live monitoring system during stoppage in transit is set up, on former transportion wire road, 35kV voltage is loaded during by stopping transport, make transportion wire road still charging operation during stopping transport, to make described transportion wire road play anti-theft function, and after enabling loading alternating voltage, system stablizes no-load running;
2) when break down in transportion wire road or accident time, on the one hand by fault localization system, the voltage on transportion wire road, the measurement data of electric current are carried out to analysis and are done fault location; Start the trip protection system on transportion wire road on the other hand, tripping circuit, to realize protecting transportion wire road.
3), when stop transport in transportion wire road, utilize Exchange Station power supply in current conversion station to the positive pole on transportion wire road, negative pole, ground connection charging.
Further, during stopping transport, transportion wire road keeps unloaded charging operation; The one-sided charging of both-end direct current system, multiterminal and other then charge according to line sectionalizing; In order to realize preventing overhead line structures or wire from being stolen, need circuit retainer belt within the refreshment period electric but zero load.Ground electrode circuit needs charged equally.
Further, utilize the side dress current measuring device on transportion wire road, current measurement value is delivered to backstage, connects trip protection system and fault localization system.
Further, the station electrical interconnection system of current conversion station is utilized to carry out Long-distance Control and automatic switching; System can realize a distant place and control, and realizes the switching from normal power transmission to charged anti-theft modes.
It should be noted that, after the present invention puts into operation, during being applied to DC engineering stoppage in transit, after line outage, current conversion station earthed switch completes and runs line side electric discharge backed off after random ground connection, disconnect the earth electrode side isolating switch of ground electrode circuit, start native system, realize filling 35kV alternating current to circuit is one-sided by power-supply system 101, realize the charged anti-theft feature to line facility, facility, shielding system 104 achieves the long-range of system and moves back throwing, without the need to artificial reconfiguration wire or switching; And native system can also be applied to multiterminal or All other routes system, multiterminal and other line systems then charge according to line sectionalizing.
With specific embodiment, the preferred embodiment of the present invention is explained in detail by reference to the accompanying drawings above; but the present invention is not limited to above-mentioned execution mode; in the ken that those of ordinary skill in the art possess; do not depart from equivalent replacement or change etc. the various changes that present inventive concept makes, all belong to the scope of protection of the invention.
Claims (10)
1. the live monitoring method of high-voltage dc transmission power transmission sequence, is characterized in that:
1) a circuit live monitoring system during stoppage in transit is set up, on former transportion wire road, 35kV voltage is loaded during by stopping transport, make transportion wire road still charging operation during stopping transport, to make described transportion wire road play anti-theft function, and after enabling loading alternating voltage, system stablizes no-load running;
2) when break down in transportion wire road or accident time, on the one hand by fault localization system, the voltage on transportion wire road, the measurement data of electric current are carried out to analysis and are done fault location; Start the trip protection system on transportion wire road on the other hand, tripping circuit, to realize protecting transportion wire road.
3), when stop transport in transportion wire road, utilize Exchange Station power supply in current conversion station to the positive pole on transportion wire road, negative pole, ground connection charging.
2. the live monitoring method of high-voltage dc transmission power transmission sequence according to claim 1, is characterized in that: during stopping transport, and transportion wire road keeps unloaded charging operation; The one-sided charging of both-end direct current system, multiterminal and other then charge according to line sectionalizing; In order to realize preventing overhead line structures or wire from being stolen, need circuit retainer belt within the refreshment period electric but zero load.Ground electrode circuit needs charged equally.
3. the live monitoring method of high-voltage dc transmission power transmission sequence according to claim 1, is characterized in that: the side dress current measuring device utilizing transportion wire road, current measurement value is delivered to backstage, connects trip protection system and fault localization system.
4. the live monitoring method of high-voltage dc transmission power transmission sequence according to claim 1, is characterized in that: utilize the station electrical interconnection system of current conversion station to carry out Long-distance Control and automatic switching; System can realize a distant place and control, and realizes the switching from normal power transmission to charged anti-theft modes.
5. the live monitoring system of high-voltage dc transmission power transmission sequence, comprise supply unit (101), reactive power compensator (102), monitoring and protecting device (103) and spacer assembly (104), it is characterized in that: supply unit (101) comprises 10KV/35KV step-up transformer, 35KV circuit breaker and 35KV isolating transformer, the input that input connects 10KV system, output connects spacer assembly (104) of supply unit (101), reactive power compensator (102) is arranged on the 35KV bus of supply unit (101), forms the capacitive reactive power collocation structure to nonloaded line, monitoring and protecting device (103) has several detection signal inputs and at least one control output end, the detection signal input of monitoring and protecting device (103) connects the equipment along the line of high-voltage dc transmission power transmission sequence, namely the equipment along the line of high-voltage dc transmission power transmission sequence is monitored by described detection signal input, form the detection to line fault and location structure, the control signal output of monitoring and protecting device (103) connects the control signal input of spacer assembly (104), the signal output part of spacer assembly (104) is connected on 500KV/800KV circuit, form the fault trip control structure of the equipment along the line of high-voltage dc transmission power transmission sequence, to protect monitoring burglary-resisting system equipment.
6. the live monitoring system of high-voltage dc transmission power transmission sequence according to claim 5, is characterized in that: supply unit (101) comprises 10kV switch cubicle (1), 10kV circuit breaker (2), 10kV current transformer (3), 35kV switch cubicle (4), 10kV/35kV transformer (6), 35kV circuit breaker (7), 35kV isolating switch (8) and 35kV isolating transformer (9); Spacer assembly (104) comprises 35kV current transformer (10), 35kV circuit breaker (7), 35kV isolating switch (8), neutral line isolation switch (11) and high voltage isolator (12); Reactive power compensator (102) comprises 35kV isolating switch (8), 35kV circuit breaker (7) and 35kV compensation reactor (13); Monitoring and protecting device (103) comprises secondary cable (14), route survey structure-preserving (15), fault localization structure (16) and current measure structure (17); High-voltage dc transmission electric wire connects shielding system 35kV cable (5) by high voltage isolator (12), and the outlet of current conversion station earth electrode connects shielding system 35kV cable (5) by neutral line isolation switch (11); Monitoring and protecting system (4) is by secondary cable (14) access shielding system 35kV current transformer (10); Transformer station is by 10kV system power supply through 10kV/35kV transformer (6) boosting access power-supply system (1), and power-supply system (1) 35kV isolating transformer (9) outlet connects shielding system (2); Reactive compensation system (3) is through 35kV bus (19) access power-supply system (1).
7. the live monitoring system of high-voltage dc transmission power transmission sequence according to claim 6, is characterized in that: described current measure structure (17) is arranged on high-voltage dc transmission electric wire, plays the effect of monitoring circuit; Monitoring and protecting system (103) possesses fault localization structure and line protective structure, and the fault current data-triggered line protective structure recorded by current measuring device (17) realizes the protection of transportion wire road.
8. the live monitoring system of high-voltage dc transmission power transmission sequence according to claim 6, is characterized in that: described fault localization function, by after fault current data-triggered, calculates the position of fault origination point according to fault current data; Described route protection function, by after fault current data-triggered, controls the 35KV circuit breaker (7) of shielding system (104) automatically, the relevant connection of deenergization system (101) and shielding system (104).
9. the live monitoring system of high-voltage dc transmission power transmission sequence according to claim 6, is characterized in that: the high voltage isolator (12) of shielding system (104) is arranged near the outlet of DC engineering high voltage transmission line; Neutral line isolation switch (11) is arranged near earth electrode outlet.
10. the live monitoring system of high-voltage dc transmission power transmission sequence according to claim 6, it is characterized in that: described reactive compensation system (102) causes the capacitive reactive power in 35kV isolating transformer (9) loop to carry out reactive power compensation for circuit no-load running, compensation capacity is by calculating, and every 100km circuit supplements capacity and is about 200kVar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510816243.7A CN105245017B (en) | 2015-11-21 | 2015-11-21 | Live monitoring method and system for high-voltage direct-current transmission line |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510816243.7A CN105245017B (en) | 2015-11-21 | 2015-11-21 | Live monitoring method and system for high-voltage direct-current transmission line |
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| Publication Number | Publication Date |
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| CN105245017A true CN105245017A (en) | 2016-01-13 |
| CN105245017B CN105245017B (en) | 2020-06-16 |
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| CN201510816243.7A Expired - Fee Related CN105245017B (en) | 2015-11-21 | 2015-11-21 | Live monitoring method and system for high-voltage direct-current transmission line |
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Cited By (1)
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| CN109683645A (en) * | 2018-11-14 | 2019-04-26 | 遵义华正电缆桥架有限公司 | A kind of power equipment with self feed back function |
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| CN105245017B (en) | 2020-06-16 |
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