CN110146766B - Method for processing single-phase grounding signal in closed-loop operation - Google Patents
Method for processing single-phase grounding signal in closed-loop operation Download PDFInfo
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- CN110146766B CN110146766B CN201811367996.4A CN201811367996A CN110146766B CN 110146766 B CN110146766 B CN 110146766B CN 201811367996 A CN201811367996 A CN 201811367996A CN 110146766 B CN110146766 B CN 110146766B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Abstract
The invention relates to a method for processing a single phase grounding signal in loop closing operation, which specifically comprises the following steps: receiving a single-phase grounding signal sent by a background or monitoring of the transformer substation; judging whether the signal is sent by mistake; checking whether primary equipment in the station has faults; if no fault is found in the station, judging whether loop closing operation occurs before the signal is sent out; if the loop closing operation occurs, judging the grounding mode of a system neutral point; if the arc suppression coil is grounded, judging the operation condition of an arc suppression coil device configured by the system; if the arc suppression coil device runs abnormally, restarting an arc suppression coil device module; if the single-phase grounding signal of the system does not disappear after the restart, the single-phase grounding signal is directly transferred to a pull test searching module for processing, and if the signal disappears, the flow is directly ended. According to the influence of the compensation condition of the arc suppression coil on the neutral point voltage, the method for searching the single-phase grounding accident by the pull method is corrected, and the processing efficiency of the single-phase grounding accident during the loop closing operation is improved.
Description
Technical Field
The invention relates to the technical field of power distribution network operation, in particular to a method for processing a single-phase grounding signal in a closed loop operation.
Background
In most of power distribution network systems, an operation mode that a neutral point is not grounded or is grounded through an arc suppression coil is adopted, when a single-phase ground fault occurs, the voltage of a fault phase to ground is reduced, the voltage of a non-fault phase is increased to be a line voltage, the line voltage is still symmetrically operated, and continuous power supply to users is not influenced. However, if the fault phase circuit is operated under the line voltage for a long time, the insulation weak link is broken down and developed into an interphase short circuit, so that the accident is expanded, and the power supply of a user is influenced. Therefore, in the operation of the power grid, under the condition of a single-phase earth fault, the continuous operation of the power grid is generally regulated to be not more than two hours, and after the fault occurs, a fault line is found immediately to be isolated.
In order to find single-phase grounding rapidly and timely, a single-phase grounding signal is generally set in a transformer substation monitoring background, so that the background can send a signal to notify monitoring personnel and operating personnel timely after single-phase grounding occurs. After receiving the single-phase grounding signal, how to find and process the fault in time becomes a method which must be mastered by operation and maintenance personnel of the transformer substation. With the development of the technology, the technologies of fault line selection, fault location and the like are continuously applied, but the popularization degree is not enough, and most power grids still use a trial pull method to process single-phase earth faults.
The 'loop closing-loop opening' operation is a common mode for keeping uninterrupted power supply when the operation mode of the power grid is adjusted. The influence of the loop closing operation on the structure and the tide of a system at the moment is different from that of the steady-state operation of a power grid, the single-phase grounding is treated by a common 'trial-pull' method, the single-phase grounding cannot be acted at times during the loop closing operation, the trial-pull treatment is carried out blindly regardless of the actual situation, and only the fault recovery time is influenced.
Disclosure of Invention
Aiming at the problems, the invention provides a method for processing a single-phase grounding signal in the loop closing operation of a power grid with a neutral point not directly grounded, which obtains the influence of the compensation condition of an arc suppression coil on the voltage of the neutral point by analyzing the change of the capacitance of a circuit compensated by the arc suppression coil of the system before and after loop closing, further corrects a method for searching a single-phase grounding accident by a pull method, and improves the processing efficiency of the single-phase grounding accident during the loop closing operation.
The invention specifically comprises a method for processing single-phase grounding accidents, wherein the method comprises four judging modules of loop closing operation, neutral point grounding, arc suppression coil operation conditions and signal disappearance, an arc suppression coil restarting device and a trial-pull path searching processing module, and specifically comprises the following steps:
the first step is as follows: receiving a single-phase grounding signal sent by a background or monitoring of the transformer substation;
the second step is that: and judging whether the signal is sent by mistake, checking the signal sending time on the device, and resetting to see whether the signal is sent again. If the signal can be directly restored, the flow is directly ended. If the signal can not be recovered, the signal is confirmed to send out a single-phase grounding signal, and the third step is carried out.
The third step: and judging the fault property and the fault condition according to the signals, meter indication, weather, operation mode and operation condition, and checking whether the fault phenomenon exists in primary equipment connected with a fault section bus and equipment in a main transformer station or not. If the equipment in the station is found to be in fault, switching to an equipment fault processing module in the station; and if the in-station check does not find the fault, the fourth step is carried out.
The fourth step: judging whether loop closing operation occurs before the signal is sent out, and if no loop closing operation occurs, directly switching to a pull-test path searching module for processing; if loop closing operation occurs, switching to a fifth step for processing;
the fifth step: judging the grounding mode of a system neutral point, and if the system neutral point is directly grounded, directly switching to a trial pull circuit searching module for processing; if the arc suppression coil is grounded, switching to a sixth step for processing;
and a sixth step: judging the operation condition of an arc suppression coil device configured by the system, and if the arc suppression coil device operates normally, directly switching to a trial pull path searching module for processing; if the arc suppression coil device runs abnormally, directly switching to a seventh step for processing;
the seventh step: and restarting the arc suppression coil device module, if the system enters the restart arc suppression coil module abnormally, closing the power supply of the arc suppression coil control device, and opening the arc suppression coil control device after 5 seconds.
Eighth step: and (4) judging whether the signal disappears, checking whether the single-phase grounding signal of the system disappears after the arc suppression coil device is restarted, if the signal does not disappear, directly switching to a trial pull path searching module for processing, and if the signal disappears, directly ending the flow.
The specific method of the trying to pull the route searching module mentioned in the first, second, third and sixth steps is as follows:
1) for a double-bus or important dual-power user, after a load is led to another bus or another power supply, the bus-tie breaker is disconnected, whether the fault disappears or not is judged, whether a grounding signal still exists on the other section of bus or not is judged, and a fault line is selected.
2) After finding out the fault line, notifying the non-important line to check after power failure; for the line of an important user, the load can be reversed, and power failure treatment is carried out after the preparation.
The third step is that the method for processing the faults in the station comprises the following steps:
1) the fault in the station can not be isolated, the double buses can be operated by reversing the buses, and the fault bus is overhauled in a power failure mode. The single bus is used for transferring load, and the important user can reverse the bypass bus and the fault bus is subjected to power failure maintenance conditionally.
2) For the fault which can only be isolated by the isolating switch, the fault is isolated by a method of a reverse running mode through switching operation; when the running mode can not be reversed, the method is used as a manual grounding method to pull open the fault point.
The sixth step is that the specific method for judging the operation condition of the arc suppression coil comprises the following steps:
1) judging whether the arc suppression coil automatic control device is normally powered on or not, and enabling the display to work;
2) judging whether the information such as the running state and the like on the control screen panel is normal or not;
3) and judging whether the data of the gear, the midpoint voltage, the midpoint current, the capacitance current, the residual current, the detuning degree and the like of the arc elimination coil on the control panel are refreshed or not, whether the data exceed the standard or not and whether the gear runs in full gear or not.
Drawings
FIG. 1 is a flow chart of a method for processing single-phase ground signals in a loop closing operation according to the present invention;
FIG. 2 shows a normal operation of the primary equipment;
FIG. 3 shows the operation mode of a 35kV system in fault;
FIG. 4 is a schematic diagram of system compensation before and after loop closing.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
Fig. 1 is a flow chart of a method for processing a single-phase grounding signal in a loop closing operation provided by the invention.
FIG. 2 shows a schematic diagram of partial power supply connection of a primary system of a 220kV prosperity transformer, a 110kV Qin-south transformer, a 35kV Yifeng transformer, a 35kV north dragon transformer and a 35kV great longitudinal lake transformer of a regional power grid in the embodiment. Under a normal operation mode, the Qin-south changing 35kV system supplies load to the Yifeng changing and the Beilong changing, and the Wansheng changing 35kV bus supplies load to the great longitudinal lake.
110kV Qin nan becomes 1, 2 main transformer high-voltage side switch to 1, 2 main transformer middle door type frame jumper clamp generate heat, need to stop processing 1, 2 main transformer wheel. Before operation, a Wansheng transformation south 387 circuit is used for supplying a Qin-south transformation 35kV bus, and the Wansheng transformation south 387 circuit supplies a Qin-south transformation 10kV bus load through a No. 301 main transformer and a No. 1 main transformer and a No. 101 main transformer. In order to ensure safety and reduce the burden of 387 circuits in the great south, the Zhannan to Qinyi 385 circuit is switched from operation to hot standby, and the Yifeng load is supplied in series by the great longitudinal lake to great significance 381 circuit.
TABLE 1 procedure
The operation steps of the No. 2 main transformer and the 110kV bus outage front-type adjustment according to the operation task ticket drawn by the scheduling are shown in the table 1: when the Qin and nan change-to-reverse load operation task is executed, the switch of Dachang lake to Dayi 381 switches to earth and then operates in earth with 35kV C in Qin and nan. Fig. 3 is the operation mode of a 35kV system in fault, and fig. 4 is a compensation schematic diagram of the system before and after loop closing.
According to the single-phase ground fault processing method disclosed by the invention, at the moment of closing the switch of the Dachang Dayi 381 switch, the 35kV system passes through the Dachang 35kV bus → the Dachang 381 circuit → the Dachang 35kV bus → the Shengchang 386 circuit → the Wansheng 35kV bus → the Wansheng transformer → the Shengqin 773 circuit → the Qin nan transformer 110kV bus → the Qin transformer → the Qin nan transformer 35kV bus → the Qin 385 circuit → the Yichang 35kV bus, so that a loop is formed. See table 2, compare with the operation mode before closing the ring, the Qin and nan becomes that 35kV arc suppression coil compensates circuit length and increases overhead power line capacitance current to some extent. Before loop closing, the line of the great meaning 381 and the line of the south China 387 have voltage and capacitance current although the lines are not operated.
TABLE 2 Change in Compensation Range before and after Loop closing
An operator of the transformer substation patrols and finds that the automatic control device for the Qin-south transformer 35kV arc suppression coil is halted, the current gear is displayed to be 1, the voltage of the central point is 5500V, and the current gear shifting is in an automatic mode. And an operator restarts the automatic arc suppression coil device, manually modulates the gear of the arc suppression coil by 9 gears, and reduces the neutral point voltage and residual current to a qualified range. 7:33 minutes dispatchers pull the Qin-nan to Qin-Yi 385, and the grounding information is returned. According to the closed loop analysis, the capacitance current of a 35kV system is increased after the closed loop, and the station is provided with an automatic tracking arc suppression coil device, is in low-gear operation before the closed loop and is automatically adjusted to high-gear operation after the closed loop. Neutral point capacitance current collected by the arc suppression coil device of Qin south becoming the same day is not increased at the closing moment, but is reduced after the ring is released, and faults of the arc suppression coil device are also proved.
To sum up, the loop closing operation has increased the circuit length that the 35kV system was taken, and the unbalanced three-phase degree grow of circuit to earth capacitance simultaneously leads to 35kV system electric capacity electric current to increase, and the arc suppression coil shifts the shelves failure, causes the arc suppression coil compensating current not enough, has finally increased neutral point voltage for send out single-phase ground signal by mistake. The processing procedure shows that the processing method can rapidly solve the single-phase grounding signal in the loop closing operation.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. A method for processing a single-phase grounding signal in a loop closing operation is characterized by comprising the following steps:
step (1): receiving a single-phase grounding signal sent by a background or monitoring of the transformer substation;
step (2): judging whether the signal is sent by mistake, checking the signal sending time on the device, resetting and then judging whether the signal is sent again, if the signal can be directly reset, ending the process; if the signal can not be recovered, the signal is confirmed to send out a single-phase grounding signal, and the step (3) is carried out for processing;
and (3): judging the nature and the condition of the fault according to the signal, meter indication, weather, running mode and operation condition, checking whether the equipment in the station connected with the fault section bus has the fault phenomenon, and if the equipment in the station has the fault, switching to an equipment fault processing module in the station; if the equipment in the station does not find the fault in the inspection, the step (4) is carried out for processing;
and (4): judging whether loop closing operation occurs before the signal is sent out, and if no loop closing operation occurs, directly switching to a pull-test path searching module for processing; if the loop closing operation occurs, switching to the step (5) for processing;
and (5): judging the grounding mode of a system neutral point, and if the system neutral point is directly grounded, directly switching to a trial pull circuit searching module for processing; if the arc suppression coil is grounded, the step (6) is carried out for processing;
and (6): judging the operation condition of an arc suppression coil device configured by the system, and if the arc suppression coil device operates normally, directly switching to a trial pull path searching module for processing; if the arc suppression coil device runs abnormally, directly switching to the step (7) for processing;
and (7): restarting the arc suppression coil device module, if the system enters the restart arc suppression coil module abnormally, closing the power supply of the arc suppression coil control device, and opening the arc suppression coil control device after 5 seconds;
and (8): and (4) judging whether the signal disappears, checking whether the single-phase grounding signal of the system disappears after the arc suppression coil device is restarted, if the signal does not disappear, directly switching to a trial pull path searching module for processing, and if the signal disappears, directly ending the flow.
2. The method as claimed in claim 1, wherein the trial pull search module is configured to:
1) for a double-bus or important dual-power user, after a load is led to another bus or another power supply, a bus-tie breaker is disconnected, whether a fault disappears or not is judged, whether a grounding signal still exists on another section of bus or not is judged, and a fault line is selected;
2) after finding out the fault line, notifying the non-important line to check after power failure; for the line of an important user, the power failure treatment is carried out after the load is reversed and the preparation is carried out.
3. The method for processing the single-phase grounding signal in the loop closing operation according to claim 2, wherein the method for processing the intra-station fault in the step (3) is as follows:
1) if the fault in the station cannot be isolated, the bus is inverted to operate and the fault bus is overhauled in a power failure mode if the fault in the station is a double bus, and if the fault in the station is a single bus, a user transfers load, the bypass bus is inverted, and the fault bus is overhauled in a power failure mode;
2) for the fault which can only be isolated by the isolating switch, the fault is isolated by a method of a reverse running mode through switching operation; when the running mode can not be reversed, the method is used as a manual grounding method to pull open the fault point.
4. The method for processing the single-phase grounding signal in the closed loop operation according to claim 3, wherein the specific method for judging the operation condition of the arc suppression coil in the step (6) is as follows:
1) judging whether the arc suppression coil automatic control device is normally powered on or not and whether the display works or not;
2) judging whether the running state information on the control screen panel is normal or not;
3) and judging whether the gear, the midpoint voltage, the midpoint current, the capacitance current, the residual current and the detuning data of the arc-extinguishing coil on the control panel are refreshed or not, whether the data exceed the standard or not and whether the gear runs in full gear or not.
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