CN105245017B - Live monitoring method and system for high-voltage direct-current transmission line - Google Patents
Live monitoring method and system for high-voltage direct-current transmission line Download PDFInfo
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- CN105245017B CN105245017B CN201510816243.7A CN201510816243A CN105245017B CN 105245017 B CN105245017 B CN 105245017B CN 201510816243 A CN201510816243 A CN 201510816243A CN 105245017 B CN105245017 B CN 105245017B
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Abstract
The invention relates to an electrified monitoring method and system of a high-voltage direct-current transmission line, which is characterized in that: 1) establishing a line live monitoring system during outage, loading 35kV voltage on an original transmission line during outage, so that the transmission line still runs in a live state during the outage, the transmission line can play an anti-theft role, and the system can run stably in a no-load state after the alternating voltage is loaded; 2) when a transmission line has a fault or an accident, on one hand, the measurement data of the voltage and the current of the transmission line are analyzed by a fault location system for fault location; and on the other hand, a protection tripping system of the transmission line is started to trip the line, so that the transmission line is protected. 3) When the transmission line is stopped, the power supply for the AC station in the converter station is used to charge the positive pole, the negative pole and the ground of the transmission line. The invention has the advantages of real-time monitoring of the line, effective prevention of theft of line facilities, convenient maintenance and overhaul, high management efficiency and the like by establishing the line live monitoring system during outage.
Description
Technical Field
The invention relates to an electrified monitoring method and system for a high-voltage direct-current transmission line. Belongs to the technical field of direct current engineering high-voltage line monitoring equipment.
Background
Direct current engineering is generally applied to long-distance and high-power transmission conditions, and electric energy of western power centers in China, such as large hydropower stations or large coal energy base power plants, is generally directly transmitted to eastern energy consumption centers domestically. When the electric energy of the power supply center is in a low valley, such as when the hydropower station is in a dry water period or a low water period, the direct current converter station may stop supplying power in a rest period of the power transmission period. For example, in the middle Asia multinational direct current networking project to be built, the direct current converter station works for 5 months in the full-year rich water period, and does not supply power for 7 months in the dry water period. During the rest period, the line is powered off, the system stops running, and the line still needs to be maintained, monitored and managed. The line distribution is large, so that the maintenance, monitoring and management of the line are difficult, and the real-time monitoring is difficult. Furthermore, when the line is not live, the line equipment and equipment may be stolen.
In the prior art, direct current engineering lines are not provided with an electrified anti-theft design, and the operation and maintenance of the lines usually depend on the staff of an operation unit to regularly patrol the lines and check each base tower and each lead. Routine maintenance typically relies on hiring local residents to take pictures of inspections and reports as part-time patrolmen. Although effective, this inspection work still has the following problems:
(1) the inspection requires a large amount of labor cost and time, and only regular inspection can be performed, so that problems can not be solved on site at the first time, and the circuit can not be ensured to be in good condition at every moment without faults, broken lines and the like.
(2) The part-time patrol officer is usually a non-professional person, has no high vigilance to the problem of the line, and can also have the problems of untimely reporting, inaccuracy and the like.
Disclosure of Invention
One of the purposes of the invention is to provide an electrified monitoring method for a high-voltage direct-current transmission line, aiming at solving the problems that the line maintenance, monitoring and management are difficult during the rest period of a direct-current project, and line facilities and equipment are easy to steal.
The second purpose of the invention is to provide an electrified monitoring system of a high-voltage direct-current transmission line, which aims to solve the problems that the line maintenance, monitoring and management are difficult during the rest period of a direct-current project, and line facilities and equipment are easy to steal.
One of the purposes of the invention can be achieved by the following technical scheme:
the live monitoring method of the high-voltage direct current transmission line is characterized by comprising the following steps:
1) establishing a line live monitoring system during outage, loading 35kV voltage on an original transmission line during outage, so that the transmission line still runs in a live state during the outage, the transmission line can play an anti-theft role, and the system can run stably in a no-load state after the alternating voltage is loaded;
2) when a transmission line has a fault or an accident, on one hand, the measurement data of the voltage and the current of the transmission line are analyzed by a fault location system for fault location; and on the other hand, a protection tripping system of the transmission line is started to trip the line, so that the transmission line is protected.
3) When the transmission line is stopped, the power supply for the AC station in the converter station is used to charge the positive pole, the negative pole and the ground of the transmission line.
One of the purposes of the invention can be achieved by the following technical scheme:
further, during the period of outage, the power transmission line keeps in idle and live operation; the double-end direct current system is charged on one side, and the multiple ends and others are charged according to line sections; in order to prevent the theft of the line tower or the lead, the line needs to be charged but no load is needed during the rest period. The ground line also needs to be live.
Furthermore, a current measuring device of the power transmission line is utilized to transmit a current measuring value to a background to be connected with a protection tripping system and a fault distance measuring system.
Further, the station electric connection line system of the converter station is utilized for remote control and automatic switching on and off; the system can realize remote control and realize the switching from normal power transmission to a live anti-theft mode.
The second purpose of the invention can be achieved by the following technical scheme:
electrified monitoring system of high voltage direct current transmission line, including power supply unit, reactive power compensator, monitoring protection device and isolating device, its structural feature lies in: the power supply device comprises a 10kV/35kV boosting transformer, a 35kV circuit breaker and a 35kV isolating transformer, wherein the input end of the power supply device is connected with a 10kV system, and the output end of the power supply device is connected with the input end of the isolating device; the reactive compensation device is arranged on a 35kV bus of the power supply device to form a capacitive reactive compensation structure for an air-load line; the monitoring protection device is provided with a plurality of detection signal input ends and at least one control output end, the detection signal input ends of the monitoring protection device are connected with devices along the high-voltage direct-current transmission line, namely, the devices along the high-voltage direct-current transmission line are monitored through the detection signal input ends, a line fault detection and positioning structure is formed, the control signal output ends of the monitoring protection device are connected with the control signal input ends of the isolation devices, the signal output ends of the isolation devices are connected on the 500kV/800kV line, and a fault tripping control structure of the devices along the high-voltage direct-current transmission line is formed to protect the monitoring anti-theft system devices.
The second purpose of the invention can be achieved by the following technical scheme:
further, the power supply device comprises a 10kV switch cabinet, a 10kV circuit breaker, a 10kV current transformer, a 35kV switch cabinet, a 10kV/35kV transformer, a 35kV circuit breaker, a 35kV isolating switch and a 35kV isolating transformer; the isolation device comprises a 35kV current transformer, a 35kV circuit breaker, a 35kV isolating switch, a neutral line isolating switch and a high-voltage isolating switch; the reactive compensation device comprises a 35kV isolating switch, a 35kV circuit breaker and a 35kV compensation reactor; the monitoring protection device comprises a secondary cable, a line measurement protection structure, a fault distance measurement structure and a current measurement structure; the high-voltage direct-current transmission line is connected with an isolating device 35kV cable through a high-voltage isolating switch, and the grounding electrode outgoing line of the converter station is connected with the isolating device 35kV cable through a neutral line isolating switch; the monitoring protection device is connected to the 35kV current transformer of the isolation device through a secondary cable; a 10kV system power supply for a transformer substation is connected into a power supply device through a 10kV/35kV transformer in a boosting mode, and a 35kV isolation transformer of the power supply device is connected with an isolation device in an outgoing line mode; the reactive power compensation device is connected to a power supply device through a 35kV bus.
Furthermore, the current measuring structure is arranged on the high-voltage direct-current transmission line and plays a role in monitoring the line; the monitoring protection device is provided with a fault distance measurement structure and a line protection structure, and fault current data measured by the current measurement device triggers the line protection structure to realize the protection of the transmission line.
Further, after the fault distance measuring function is triggered by fault current data, the position of a fault occurrence point is calculated according to the fault current data; and after the line protection function is triggered by fault current data, automatically controlling a 35kV circuit breaker of the isolating device, and disconnecting the power supply device from the isolating device.
Furthermore, a high-voltage isolating switch of the isolating device is arranged close to an outgoing line of the direct-current engineering high-voltage transmission line; the neutral line isolating switch is arranged close to the grounding electrode outgoing line.
Further, the reactive compensation device performs reactive compensation on capacitive reactive power of a 35kV isolation transformer loop caused by no-load operation of a line, compensation capacity is obtained through calculation, and the compensation capacity is about 200kVar per 100km of line.
The invention has the following outstanding advantages:
1. according to the invention, by establishing a line electrification monitoring system during outage, 35kV voltage is loaded on an original transmission line during outage, so that the transmission line still operates in an electrified way during the outage, the transmission line can play an anti-theft role, and the system can stably operate in a no-load way after AC voltage is loaded; when a transmission line has a fault or an accident, on one hand, the measurement data of the voltage and the current of the transmission line are analyzed by a fault location system for fault location; on the other hand, a protection tripping system of the transmission line is started to trip the line, so that the transmission line is protected; therefore, the direct current engineering line maintenance, monitoring and management difficulty during the rest period can be solved, and the problem that line facilities and equipment are easily stolen can be solved, and the direct current engineering line maintenance, monitoring and management method has the advantages that the line is monitored in real time, accidents or faults can be found and positioned in time, stable and more reliable monitoring information can be obtained, the investment of manpower is saved, the line facilities are effectively prevented from being stolen, the overhaul and maintenance are convenient, the management efficiency is high, and the like.
2. The electrified monitoring system of the high-voltage direct-current transmission line can realize remote switching, and is safer and more reliable; the system can be used for a double-end or multi-end direct current system, and is wide in application range, safe and reliable. The unique equipment arrangement pattern makes full use of the limited space of the transformer substation, reasonably arranges equipment and wiring, fully considers the safety, and simultaneously adds a plurality of pieces of equipment without crowding.
Drawings
Fig. 1 is a wiring diagram of a reactive power compensation device and a power supply device of the present invention.
Fig. 2 is a wiring diagram of the isolation device and the monitoring protection device.
Detailed Description
Detailed description of the preferred embodiment 1
Referring to fig. 1 and 2, the live monitoring system for the high-voltage direct-current transmission line according to the embodiment includes a power supply device 101, a reactive compensation device 102, a monitoring protection device 103 and an isolation device 104, wherein the power supply device 101 includes a 10kV/35kV step-up transformer, a 35kV breaker and a 35kV isolation transformer, an input end of the power supply device 101 is connected with a 10kV system, and an output end of the power supply device is connected with an input end of the isolation device 104; the reactive compensation device 102 is arranged on a 35kV bus of the power supply device 101 to form a capacitive reactive compensation structure for an air-load line; the monitoring protection device 103 is provided with a plurality of detection signal input ends and at least one control output end, the detection signal input ends of the monitoring protection device 103 are connected with the devices along the high-voltage direct-current transmission line, namely, the devices along the high-voltage direct-current transmission line are monitored through the detection signal input ends to form a detection and positioning structure for line faults, the control signal output ends of the monitoring protection device 103 are connected with the control signal input ends of the isolation devices 104, the signal output ends of the isolation devices 104 are connected on the 500kV/800kV line to form a fault tripping control structure for the devices along the high-voltage direct-current transmission line, so that the devices of the monitoring anti-theft system are protected.
In this embodiment:
the power supply device 101 comprises a 10kV switch cabinet, a 10kV circuit breaker, a 10kV current transformer, a 35kV switch cabinet, a 10kV/35kV transformer 6, a 35kV circuit breaker, a 35kV isolating switch and a 35kV isolating transformer 9; the isolation device 104 comprises a 35kV current transformer 10, a 35kV circuit breaker 7, a 35kV isolating switch 8, a neutral line isolating switch 11 and a high-voltage isolating switch 12; the reactive power compensation device 102 comprises a 35kV disconnecting switch, a 35kV circuit breaker and a 35kV compensation reactor 13; the monitoring protection device 103 comprises a secondary cable 14, a line measurement protection structure 15, a fault distance measurement structure 16 and a current measurement structure 17; the high-voltage direct-current transmission line is connected with an isolating device 35kV cable 5 through a high-voltage isolating switch 12, and the output line of the grounding electrode of the converter station is connected with the isolating device 35kV cable 5 through a neutral line isolating switch 11; the monitoring protection device 103 is connected with a 35kV current transformer 10 of an isolation device 104 through a secondary cable 14; a 10kV system power supply for a transformer substation is connected into a power supply device 101 through a 10kV/35kV booster transformer 6 in a boosting mode, and a 135kV isolation transformer 9 of the power supply device 101 is connected with an isolation device 104 in an outgoing line mode; the reactive power compensation device 102 is connected to the power supply device 101 via a 35kV bus 19.
The current measuring structure 17 is arranged on the high-voltage direct-current transmission line and plays a role in monitoring the line; the monitoring protection device 103 has a fault location structure and a line protection structure, and the fault current data measured by the current measurement device 17 triggers the line protection structure to realize the protection of the transmission line.
After the fault distance measurement function is triggered by fault current data, calculating the position of a fault occurrence point according to the fault current data; after the line protection function is triggered by fault current data, the 35kV circuit breaker 7 of the isolation device 104 disconnects the power supply device 101 from the isolation device 104.
Because the invention relates to more equipment, the space of the substation is limited, the reasonable arrangement method has larger influence on the safety of equipment operation and the convenience of management, and in order to achieve the purposes of concise arrangement and safe operation among the equipment, the arrangement of the substation station is as follows:
the high-voltage isolating switch 12 of the isolating device 104 is arranged close to the outgoing line of the direct-current engineering high-voltage transmission line; the neutral line isolation switch 11 is arranged close to the grounding electrode outgoing line.
The reactive compensation device 102 performs reactive compensation on capacitive reactive power of a 35kV isolation transformer 9 loop caused by no-load operation of a line, and compensation capacity is obtained through calculation, and the compensation capacity is about 200kVar per 100km of line.
The 35kV circuit breaker 7, the 35kV isolating switch 8 and the 35kV current transformer 10 are arranged in a 35kV switch cabinet; the 10kV circuit breaker and the 10kV current transformer are arranged in the 10kV switch cabinet; the 35kV switch cabinet and the 10kV switch cabinet are arranged in a transformer substation power utilization chamber.
The 35kV compensation reactor 13, the 10kV/35kV boosting transformer 6 and the 35kV isolation transformer 9 are arranged beside a station electric room in a semi-outdoor mode and are connected with indoor equipment through cables, and the 35kV cable 5 and other secondary cables 14 are laid in a cable trench.
The high-voltage isolating switch 12 of the isolating device 104 is arranged close to the outgoing line of the direct-current engineering high-voltage transmission line; the neutral line isolation switch 11 is arranged close to the grounding electrode outgoing line.
The line measurement protection device 15 and the fault distance measuring device 16 are arranged in a screen cabinet 18, and the screen cabinet 18 is arranged in a control room of a main control building, so that a manager can conveniently monitor and manage the system, and a line can be timely found and processed when a fault occurs.
The arrangement mode fully considers the operation safety and the use convenience of the equipment, ensures that each equipment can adapt to the operation environment while not occupying too much space of the transformer substation, and ensures that transformer substation workers are more familiar with the equipment by an orderly arrangement method, thereby facilitating the management and the maintenance of a system.
Referring to fig. 1, the 35kV voltage of the power supply apparatus 101 is obtained by boosting a 10kV system for a transformer substation through an 10/35kV transformer, the 35kV voltage of the power supply apparatus 101 is safely output through an isolation transformer, and an outgoing line of the isolation transformer is correspondingly connected to the isolation apparatus 104.
Referring to fig. 2, a 35kV current transformer 10, a 35kV circuit breaker 7, a 35kV disconnector 8 and a 35kV single-core cable of an isolator 104 are connected in series in sequence, a direct current engineering high-voltage transmission line is connected with the 35kV single-core cable of the isolator 104 through a high-voltage disconnector 12, and an earth electrode outlet line is connected with the 35kV single-core cable through a neutral line disconnector 11.
As the 35kV voltage runs in the DC engineering high-voltage transmission line in an idle load mode, the isolation transformer loop can generate honor reactive power, and the reactive power compensation device 102 is configured for compensating the capacitive reactive power of the isolation transformer loop. Referring to fig. 1, a compensation reactor in the reactive power compensation device 102 is a capacitive reactive power compensation device, and is connected to a power supply device 101 through a 35kV bus 19, and compensation capacity of the compensation reactor is obtained through calculation, and the compensation capacity is about 200kvar per 100km of line.
Referring to fig. 2, the line measurement protection device 15 and the fault location device 16 of the monitoring protection device 103 are connected to the 35kV current transformer 10 of the isolation device 104 through the secondary cable 14, and the current measurement device 17 is installed at the side of the dc engineering high-voltage transmission line to play a role of monitoring the line. After the system is put into operation, if a line has a fault, the current measuring device 17 transmits the measured fault current data to the monitoring protection device 103, and the fault distance measuring device 16 of the monitoring protection device 103 calculates the position of a fault occurrence point according to the received fault current data; and the line measurement protection device 15 is triggered by fault current data, automatically controls the 35kV circuit breaker 7 of the isolation device 104, realizes fault tripping, disconnects the relevant connection between the power supply device 101 and the isolation device 104, and carries out isolation protection on each device of the monitoring system, thereby ensuring the safe operation of the system device.
The live-line monitoring method for the high-voltage direct-current transmission line, which is related to the embodiment, is characterized by comprising the following steps:
1) establishing a line live monitoring system during outage, loading 35kV voltage on an original transmission line during outage, so that the transmission line still runs in a live state during the outage, the transmission line can play an anti-theft role, and the system can run stably in a no-load state after the alternating voltage is loaded;
2) when a transmission line has a fault or an accident, on one hand, the measurement data of the voltage and the current of the transmission line are analyzed by a fault location system for fault location; and on the other hand, a protection tripping system of the transmission line is started to trip the line, so that the transmission line is protected.
3) When the transmission line is stopped, the power supply for the AC station in the converter station is used to charge the positive pole, the negative pole and the ground of the transmission line.
Further, during the period of outage, the power transmission line keeps in idle and live operation; the double-end direct current system is charged on one side, and the multiple ends and others are charged according to line sections; in order to prevent the theft of the line tower or the lead, the line needs to be charged but no load is needed during the rest period. The ground line also needs to be live.
Furthermore, a current measuring device is arranged on the side of the power transmission line, and the current measuring value is transmitted to a background and connected with a protective tripping system and a fault distance measuring system.
Further, the station electric connection line system of the converter station is utilized for remote control and automatic switching on and off; the system can realize remote control and realize the switching from normal power transmission to a live anti-theft mode.
It should be noted that, after the invention is put into operation, the invention is applied to the period of direct current engineering shutdown, after the line has power failure, the converter station grounding switch finishes discharging to the line side and then quits the grounding operation, disconnects the grounding electrode side isolating switch of the grounding electrode line, starts the system, realizes the single-side charging of 35kV alternating current to the line through the power supply device 101, realizes the electrified anti-theft function to the line equipment and facilities, and the isolating device 104 realizes the remote quitting of the system without manual wire connection or switching; the system can also be applied to multi-terminal or other line systems, and the multi-terminal or other line systems are charged according to line sections.
While the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings and specific examples, the present invention is not limited to the embodiments, and various changes and modifications which do not depart from the spirit of the present invention and are equivalent to those skilled in the art are within the scope of the present invention.
Claims (8)
1. The live monitoring method of the high-voltage direct current transmission line is characterized by comprising the following steps:
1) establishing a line live monitoring system during outage, loading 35kV voltage on an original transmission line during outage, so that the transmission line still runs in a live state during the outage, the transmission line can play an anti-theft role, and the system can run stably in a no-load state after the alternating voltage is loaded; the line live monitoring system comprises a power supply device (101), a reactive compensation device (102), a monitoring protection device (103) and an isolation device (104), wherein the power supply device (101) comprises a 10kV/35kV boosting transformer, a 35kV circuit breaker and a 35kV isolation transformer, the input end of the power supply device (101) is connected with a 10kV system, and the output end of the power supply device is connected with the input end of the isolation device (104); the reactive compensation device (102) is arranged on a 35kV bus of the power supply device (101) to form a capacitive reactive compensation structure for an air-load line; the monitoring protection device (103) is provided with a plurality of detection signal input ends and at least one control output end, the detection signal input ends of the monitoring protection device (103) are connected with the equipment along the high-voltage direct-current transmission line, namely, the equipment along the high-voltage direct-current transmission line is monitored through the detection signal input ends to form a detection and positioning structure for line faults, the control signal output ends of the monitoring protection device (103) are connected with the control signal input ends of the isolation devices (104), the signal output ends of the isolation devices (104) are connected on the 500kV/800kV line to form a fault tripping control structure of the equipment along the high-voltage direct-current transmission line, so that the equipment for monitoring an anti-theft system is protected;
2) when a transmission line has a fault or an accident, on one hand, the measurement data of the voltage and the current of the transmission line are analyzed by a fault location system for fault location; on the other hand, a protection tripping system of the transmission line is started to trip the line, so that the transmission line is protected;
3) when the transmission line is stopped, the power supply for the AC station in the converter station is used to charge the positive pole, the negative pole and the ground of the transmission line.
2. The method for monitoring the high-voltage direct current transmission line according to claim 1, wherein the method comprises the following steps: and the current measuring device of the transmission line is utilized to transmit the current measured value to a background to be connected with a protection tripping system and a fault distance measuring system.
3. The method for monitoring the high-voltage direct current transmission line according to claim 1, wherein the method comprises the following steps: the station electric connection line system of the converter station is utilized for remote control and automatic switching on and off; the system can realize remote control and realize the switching from normal power transmission to a live anti-theft mode.
4. The method for monitoring the high-voltage direct current transmission line according to claim 1, wherein the method comprises the following steps: in the electrified monitoring system, a power supply device (101) comprises a 10kV switch cabinet, a 10kV circuit breaker, a 10kV current transformer, a 35kV switch cabinet, a 10kV/35kV booster transformer (6), a 35kV circuit breaker, a 35kV isolating switch and a 35kV isolating transformer (9); the isolation device (104) comprises a 35kV current transformer (10), a 35kV circuit breaker (7), a 35kV isolating switch (8), a neutral line isolating switch (11) and a high-voltage isolating switch (12); the reactive compensation device (102) comprises a 35kV disconnecting switch, a 35kV circuit breaker and a 35kV compensation reactor (13); the monitoring protection device (103) comprises a secondary cable (14), a line measurement protection structure (15), a fault distance measurement structure (16) and a current measurement device (17); the high-voltage direct-current transmission line is connected with an isolation device (104) and a 35kV cable (5) through a high-voltage isolation switch (12), and the grounding electrode outgoing line of the converter station is connected with the isolation device (104) and the 35kV cable (5) through a neutral line isolation switch (11); the monitoring protection system (4) is connected to the 35kV current transformer (10) of the isolation device (104) through the secondary cable (14); a 10kV system power supply for a transformer substation is connected into a power supply device (101) through a 10kV/35kV booster transformer (6) in a boosting mode, and a 35kV isolation transformer (9) of the power supply device (101) is connected with an isolation device (104) in an outgoing line mode; the reactive power compensation device (102) is connected to the power supply device (101) through a 35kV bus (19).
5. The method for monitoring the high-voltage direct current transmission line according to claim 4, wherein the method comprises the following steps: the current measuring device (17) is arranged on the high-voltage direct-current transmission line and plays a role in monitoring the line; the monitoring protection device (103) is provided with a fault distance measurement structure and a line protection structure, and fault current data measured by the current measurement device (17) triggers the line protection structure to realize transmission line protection.
6. The method for monitoring the high-voltage direct current transmission line according to claim 4 or 5, wherein the method comprises the following steps: after the fault distance measurement function is triggered by the fault current data, calculating the position of a fault occurrence point according to the fault current data; after the line protection function is triggered by fault current data, a 35kV circuit breaker (7) of the isolation device (104) disconnects the power supply device (101) from the isolation device (104).
7. The method for monitoring the high-voltage direct current transmission line according to claim 4 or 5, wherein the method comprises the following steps: a high-voltage isolating switch (12) of the isolating device (104) is arranged close to a direct-current engineering high-voltage transmission line outlet; the neutral line isolating switch (11) is arranged close to the grounding electrode outgoing line.
8. The method for monitoring the high-voltage direct current transmission line according to claim 4 or 5, wherein the method comprises the following steps: the reactive compensation device (102) performs reactive compensation on capacitive reactive power of a 35kV isolation transformer (9) loop caused by no-load operation of a line, and compensation capacity is obtained through calculation, and the capacity is supplemented by 200kVar every 100km of the line.
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