CN110927518B - Single-phase earth fault route-pulling and route-selecting method for small current grounding system - Google Patents
Single-phase earth fault route-pulling and route-selecting method for small current grounding system Download PDFInfo
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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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Abstract
The invention provides a single-phase earth fault route-pulling and route-selecting method of a small-current grounding system, which comprises the following steps: firstly, inputting a pull-limiting sequence table; secondly, a one-key sequence control program for single-phase earth fault route pulling and selecting is arranged in the line monitoring platform; setting a ground fault exploration operation sequence table in a one-key sequence control program, and setting an automatic sequencing rule of the ground fault exploration operation sequence table; setting ground fault exploration criteria in a one-key sequence control program; one-key sequential control program calling; sixthly, generating a final sequence table of the ground fault exploration operation; and seventhly, automatically pulling the circuit to search the circuit with the ground fault. The invention provides a novel method for pulling a route and selecting a single-phase earth fault of a low-current grounding system, which can conveniently, quickly and efficiently find out the route of the low-current grounding system with the single-phase earth fault, and greatly improve the efficiency of finding a fault route and handling an accident.
Description
Technical Field
The invention relates to the field of power distribution network ground fault processing methods, in particular to a single-phase ground fault route pulling and selecting method for a low-current grounding system.
Background
At present, most domestic power distribution networks belong to a low-current grounding system, and a mode that a neutral point is not directly grounded (including the neutral point which is not grounded and the neutral point which is grounded through an arc suppression coil) is adopted. The probability of single-phase earth fault of the small-current earth system is very high, the line voltage symmetry can still be ensured due to power supply during fault, the fault current is small, continuous power supply of a load is not influenced, and power failure can be avoided immediately under normal conditions. However, as the number of distribution network feeders increases, capacitance current on a line increases gradually, and the fault is easily expanded into a two-point or multi-point grounding short circuit due to long single-phase grounding operation time; the arc grounding can cause the overvoltage of the whole system, so that the equipment is damaged, and the safe and stable operation of the system is damaged when the equipment is seriously damaged; the single-phase grounding has the phenomenon of multi-station concurrence in severe weather, and can bring about more serious results. Therefore, when a single-phase earth fault of a low-current earth system occurs in the power distribution network, a fault line needs to be checked in time and corresponding fault removal processing needs to be carried out.
According to the traditional method for checking the single-phase earth fault line of the low-current grounding system, a power supply scheduling command is issued to a monitoring person of a monitoring platform to try to pull lines which are likely to have faults one by one, after one line is pulled open, whether a bus earth remote measurement signal is reset or not is judged, if the bus earth remote measurement signal is reset, a switch is turned on, the bus earth is also operated, namely the line is judged to be grounded, and due to the fact that the lines which need to be checked are numerous, the mode is large in workload, time and labor are wasted, the accident processing efficiency is low, and the safety risk is high. With the progress of the technology, the existing substation field protection measurement and control device can realize the automatic opening and closing function of the circuit breaker, a monitoring person can remotely control the grounding exploration soft pressing plate of each circuit (the automatic opening and closing function of the circuit breaker is realized) through a monitoring platform to complete single-interval grounding searching operation, the method is more convenient than the traditional method, but the method still needs to check the circuits one by one until the grounding circuit is found, and the accident processing efficiency is still lower. Therefore, how to conveniently, rapidly and efficiently find out the line with the single-phase earth fault of the low-current earth system becomes a technical problem to be solved urgently in the industry.
Disclosure of Invention
The purpose of the invention is: aiming at the problems in the prior art, the method for pulling the route of the single-phase earth fault of the low-current grounding system is provided, the line of the single-phase earth fault of the low-current grounding system can be conveniently, quickly and efficiently checked by adopting the method, and the accident handling efficiency is greatly improved.
The technical scheme of the invention is as follows: the invention discloses a single-phase earth fault route-pulling and selecting method of a small-current grounding system, which comprises the following steps:
firstly, a pull-limiting sequence table is recorded: recording a pull-limiting sequence table of a power supply line of an area governed by a power supply department approved by a relevant department in a real-time database built in a line monitoring platform of the power supply regulation and control department, and carrying out power protection and listing on important lines needing power protection;
secondly, a one-key sequence control program for single-phase earth fault route pulling and selecting is arranged in the line monitoring platform; establishing the association between a one-key sequence control program and the grounding exploration soft pressing plate of each line and the association between the one-key sequence control program and the pull-limiting sequence table recorded in the step I;
setting an earth fault exploration operation sequence table in the one-key sequence control program, and setting an automatic sequencing rule of the earth fault exploration operation sequence table, wherein the automatic sequencing rule is as follows:
A. if a grounding line selection signal of a certain station prompts that the arc suppression coil XX line is grounded, the line grounding exploration is automatically sequenced in the front row of the grounding fault exploration operation sequence table;
B. if a certain line has a power-saving hang tag, the line grounding exploration is automatically sequenced at the last of the grounding fault exploration operation sequence table;
C. if the reclosing of a certain line is stopped, automatically moving the line grounding exploration sequence backwards in the grounding fault exploration operation sequence table;
D. the other lines are sorted according to the sequence of the other lines in the grounding exploration operation sequence table;
setting a ground fault exploration criterion in the one-key sequence control program:
E. if the signal of the corresponding grounding exploration pressing plate changes from action to return and then changes from return to action after a certain line finishes programmed route pulling operation at a single interval, and the state does not change within a certain time, the operation is judged to be successful;
F. if the grounding exploration pressing plate signal is different from the criterion E, judging that the operation fails, and stopping the operation;
G. if the grounding exploration pressing plate has bus grounding resetting information in the resetting and action processes, stopping operation, reporting the grounding of the line, and otherwise, continuing the grounding exploration operation of the next line;
H. if all the sequence operation ends and the bus grounding signal is not reset, reporting that no grounding line is found;
one-key sequence control program calling: when the monitoring platform finds that a certain bus has a ground fault, the monitoring personnel call a one-key sequence control program, the one-key sequence control program automatically screens out the lines related to the bus with the ground fault, and automatically sequences according to the sequencing rule of the step (III) to generate a sequence list to be selected for ground fault exploration operation;
generating a final sequence table of the ground fault exploration operation: the monitoring personnel approves the sequence list to be selected of the ground fault exploration operation generated in the fifth step or modifies the sequence list according to the actual mastered condition to generate a final sequence list of the ground fault exploration operation;
seventhly, automatically pulling a circuit to search a grounding fault circuit: and C, starting a pull-out searching function of a one-key sequence control program by the monitoring personnel, sequencing the final sequence table of the ground fault searching operation according to the generated sequence table of the ground fault searching operation by the one-key sequence control program, automatically pulling out and searching the line with the ground fault according to the set criterion of the step C, displaying related information of the fault line on the monitoring platform after the ground fault line is found, and finishing the searching operation.
The invention has the positive effects that: the invention relates to a single-phase earth fault route-pulling and selecting method of a small-current grounding system, which is characterized in that a one-key sequence control program for the single-phase earth fault route-pulling and selecting of the small-current grounding system is arranged on a monitoring platform at a power supply regulation and control part; and establishing the association of a one-key sequence control program and a ground exploration soft pressing plate and a pull-limit sequence table of each line, and setting the sequence table capable of sequencing according to an automatic sequencing rule and a ground fault exploration criterion in the program, when the line needs to be pulled and selected, a monitoring person starts the line pulling and selecting function of the program by one key, and the monitoring platform can automatically pull the line in an operation sequence list to search for a fault line and even find a ground fault line. Compared with the prior art, the method can conveniently, quickly and efficiently find out the line with the single-phase earth fault of the low-current earth system, greatly improve the efficiency of finding the fault line and processing the fault, effectively reduce the probability of cable fault caused by system overvoltage due to line earthing, and simultaneously find and isolate the earth line at the first time after the earth fault occurs to avoid subsequent potential safety hazards; in the grounding searching process, the power failure time of a client supplied by a non-grounding line can be effectively controlled within 2 seconds, so that the power failure perception of the client is greatly reduced, and the power supply service level is improved.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
(example 1)
The single-phase earth fault route-pulling and route-selecting method of the small-current grounding system is mainly implemented by the following steps:
firstly, a pull-limiting sequence table is recorded: and recording a pull-limiting sequence table of a power supply line in the region governed by the power supply department approved by the relevant department in a real-time database built in a line monitoring platform of the power supply regulation and control department, and carrying out power protection and listing on important lines needing power protection.
Secondly, a one-key sequence control program for single-phase earth fault route pulling and selecting is arranged in the line monitoring platform; and establishing the association between the one-key sequence control program and the grounding exploration soft pressing plate of each line and the association between the one-key sequence control program and the pull-limiting sequence table recorded in the step I.
Setting an earth fault exploration operation sequence table in the one-key sequence control program, and setting an automatic sequencing rule of the earth fault exploration operation sequence table, wherein the automatic sequencing rule is as follows:
A. if a grounding line selection signal of a certain station prompts that the arc suppression coil XX line is grounded, the line grounding exploration is automatically sequenced in the front row of the grounding fault exploration operation sequence table;
B. if a certain line has a power-saving hang tag, the line grounding exploration is automatically sequenced at the last of the grounding fault exploration operation sequence table; the information of the power protection hang tag of the line can be obtained from a power pulling and limiting sequence table;
C. if the reclosing of a certain line is stopped, automatically moving the line grounding exploration sequence backwards in the grounding fault exploration operation sequence table;
D. the remaining lines are sorted in their order in the ground exploration operation sequence table.
Setting a ground fault exploration criterion in the one-key sequence control program:
E. if the signal of the corresponding grounding exploration pressing plate changes from action to return and then changes from return to action after a certain line finishes programmed route pulling operation at a single interval, and the state does not change within a certain time, the operation is judged to be successful;
F. if the grounding exploration pressing plate signal is different from the criterion E, judging that the operation fails, and stopping the operation;
G. if the grounding exploration pressing plate has bus grounding resetting information in the resetting and action processes, stopping operation, reporting the grounding of the line, and otherwise, continuing the grounding exploration operation of the next line;
H. if all the sequence operations are finished and the bus grounding signal is not reset, the grounding circuit is reported not to be found.
One-key sequence control program calling: when the monitoring platform finds that a certain bus has a ground fault, the monitoring personnel call a one-key sequence control program, the one-key sequence control program automatically screens out the lines related to the bus with the ground fault, and automatically sorts the lines according to the sorting rule of the step (III) to generate a sequence list to be sorted for the ground fault exploration operation.
Generating a final sequence table of the ground fault exploration operation: and (4) the monitoring personnel examines the to-be-selected sequence list of the ground fault exploration operation generated in the fifth step or modifies the to-be-selected sequence list according to the actual grasped condition to generate a final sequence list of the ground fault exploration operation.
Seventhly, automatically pulling a circuit to search a grounding fault circuit: and C, starting a pull-out searching function of a one-key sequence control program by the monitoring personnel, sequencing the final sequence table of the ground fault searching operation according to the generated sequence table of the ground fault searching operation by the one-key sequence control program, automatically pulling out and searching the line with the ground fault according to the set criterion of the step C, displaying related information of the fault line on the monitoring platform after the ground fault line is found, and finishing the searching operation.
The above embodiments are illustrative of specific embodiments of the present invention, and are not restrictive of the present invention, and those skilled in the relevant art can make various changes and modifications without departing from the spirit and scope of the present invention to obtain corresponding equivalent technical solutions, and therefore all equivalent technical solutions should be included in the scope of the present invention.
Claims (1)
1. A single-phase earth fault route-pulling and route-selecting method of a small current grounding system is characterized by comprising the following steps:
firstly, a pull-limiting sequence table is recorded: recording a pull-limiting sequence table of a power supply line in an area governed by a power supply regulation and control department approved by the relevant department in a real-time database built in a line monitoring platform of the power supply regulation and control department, and carrying out power protection and listing on important lines needing power protection;
secondly, a one-key sequence control program for single-phase earth fault route pulling and selecting is arranged in the line monitoring platform; establishing the association between a one-key sequence control program and the grounding exploration soft pressing plate of each line and the association between the one-key sequence control program and the pull-limiting sequence table recorded in the step I;
setting an earth fault exploration operation sequence table in the one-key sequence control program, and setting an automatic sequencing rule of the earth fault exploration operation sequence table, wherein the automatic sequencing rule is as follows:
A. if a grounding line selection signal of a certain station prompts that the arc suppression coil XX line is grounded, the line grounding exploration is automatically sequenced in the front row of the grounding fault exploration operation sequence table;
B. if a certain line has a power-saving hang tag, the line grounding exploration is automatically sequenced at the last of the grounding fault exploration operation sequence table;
C. if the reclosing of a certain line is stopped, automatically moving the line grounding exploration sequence backwards in the grounding fault exploration operation sequence table;
D. the other lines are sorted according to the sequence of the other lines in the grounding exploration operation sequence table;
setting a ground fault exploration criterion in the one-key sequence control program:
E. if the signal of the corresponding grounding exploration pressing plate changes from action to return and then changes from return to action after a certain line finishes programmed route pulling operation at a single interval, and the state does not change within a certain time, the operation is judged to be successful;
F. if the grounding exploration pressing plate signal is different from the criterion E, judging that the operation fails, and stopping the operation;
G. if the grounding exploration pressing plate has bus grounding resetting information in the resetting and action processes, stopping operation, reporting the grounding of the line, and otherwise, continuing the grounding exploration operation of the next line;
H. if all the sequence operation ends and the bus grounding signal is not reset, reporting that no grounding line is found;
one-key sequence control program calling: when the monitoring platform finds that a certain bus has a ground fault, the monitoring personnel call a one-key sequence control program, the one-key sequence control program automatically screens out the lines related to the bus with the ground fault, and automatically sequences according to the sequencing rule of the step three to generate a sequence list to be selected for ground fault exploration operation;
generating a final sequence table of the ground fault exploration operation: the monitoring personnel approves the sequence list to be selected of the ground fault exploration operation generated in the fifth step or modifies the sequence list according to the actual mastered condition to generate a final sequence list of the ground fault exploration operation;
seventhly, automatically pulling a circuit to search a grounding fault circuit: and C, starting a pull-out searching function of a one-key sequence control program by the monitoring personnel, sequencing the final sequence table of the ground fault searching operation according to the generated sequence table of the ground fault searching operation by the one-key sequence control program, automatically pulling out and searching the line with the ground fault according to the set criterion of the step C, displaying related information of the fault line on the monitoring platform after the ground fault line is found, and finishing the searching operation.
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