CN114675139B - Method and system for determining position of power grid line fault - Google Patents
Method and system for determining position of power grid line fault Download PDFInfo
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- CN114675139B CN114675139B CN202210595807.9A CN202210595807A CN114675139B CN 114675139 B CN114675139 B CN 114675139B CN 202210595807 A CN202210595807 A CN 202210595807A CN 114675139 B CN114675139 B CN 114675139B
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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
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention is suitable for the technical field of electric signal measurement, and particularly relates to a method and a system for determining the position of a power grid line fault, wherein the method comprises the following steps: selecting two groups of parallel high-voltage cables, and respectively connecting the midpoints of the two groups of high-voltage cables to the positive electrode and the negative electrode of an external power supply; measuring primary currents at two ends of the two groups of high-voltage cables respectively to obtain a first group of current values, and determining a first fault area; respectively connecting the middle parts of the two groups of high-voltage cables positioned in the first fault area part to the positive electrode and the negative electrode of an external power supply, respectively measuring primary currents at two ends of the two groups of high-voltage cables positioned in the first fault area part to obtain a second group of current values, determining a second fault area, and repeating the step until the length of the Nth fault area is smaller than a preset value; and respectively measuring the resistance values and determining the high-voltage cable where the fault point is located. The invention measures the high-voltage cable through lower test voltage, and gradually reduces the range of fault points so as to realize accurate positioning and search the specific position of the fault points.
Description
Technical Field
The invention belongs to the technical field of electric signal measurement, and particularly relates to a method and a system for determining the position of a power grid line fault.
Background
An electric power line refers to a line used to transmit electric energy between a power plant, a substation, and an electric power consumer. It is an important component of a power supply system and is responsible for the task of delivering and distributing electrical energy.
The power lines are mainly divided into overhead lines and cable lines according to the used materials. The cable line is a power line made of cable materials; the overhead distribution line is a distribution line formed by laying power conductors in an overhead mode; an overhead transmission line is a transmission line formed by laying power conductors in an overhead mode.
When the electric wire netting circuit broke down, need overhaul through the manual work, but among the current mode of overhauing, it specifically damages the position to be difficult to specifically confirm the cable, and positioning accuracy is low.
Disclosure of Invention
The invention aims to provide a method for determining the position of a power grid line fault, and aims to solve the problems that in the existing maintenance mode, the specific damaged part of a cable is difficult to determine and the positioning precision is low.
The invention is realized in such a way that a method for determining the position of a power grid line fault comprises the following steps:
selecting two groups of parallel high-voltage cables, and respectively connecting the midpoints of the two groups of high-voltage cables to the positive electrode and the negative electrode of an external power supply;
measuring primary currents at two ends of two groups of high-voltage cables respectively to obtain a first group of current values, and determining a first fault area, wherein the first group of current values are currents between the same ends of the two groups of high-voltage cables;
respectively connecting the middle parts of the two groups of high-voltage cables positioned in the first fault area part to the positive electrode and the negative electrode of an external power supply, respectively measuring primary currents at two ends of the two groups of high-voltage cables positioned in the first fault area part to obtain a second group of current values, determining a second fault area, and repeating the step until the length of the Nth fault area is smaller than a preset value;
and respectively measuring the resistance values of the parts, located in the Nth fault area, of the two groups of high-voltage cables, and determining the high-voltage cable where the fault point is located.
Preferably, the step of selecting two groups of parallel high-voltage cables and respectively connecting the midpoints of the two groups of high-voltage cables to the positive electrode and the negative electrode of the external power supply includes:
determining the number of the parallel high-voltage cables, and numbering according to the arrangement sequence;
according to the numbering sequence, two groups of high-voltage cables are selected for fault positioning each time;
the middle points of the two groups of high-voltage cables are respectively connected to the positive pole and the negative pole of an external power supply, and the same ends of the two groups of high-voltage cables are connected through a current testing device.
Preferably, the step of determining the first failure zone specifically includes:
setting two ends of a high-voltage cable as an A end and a B end respectively, wherein a first group of current values comprise a first A-end current value between the A ends of the two groups of high-voltage cables and a first B-end current value between the B ends of the two groups of high-voltage cables;
and comparing the first A-end current value with the first B-end current value to obtain a comparison result, wherein if the first A-end current value is greater than the first B-end current value, the fault point is positioned between the midpoint and the B end of the high-voltage cable, otherwise, the fault point is positioned between the midpoint and the A end of the high-voltage cable.
Preferably, the step of respectively measuring the resistance values of the parts, located in the nth fault area, of the two groups of high-voltage cables and determining the high-voltage cable where the fault point is located specifically includes:
respectively measuring the resistance values of the two groups of high-voltage cables in the Nth fault area part to obtain two groups of independent resistance values;
and comparing the two groups of independent resistance values, wherein the high-voltage cable with the large resistance value is the high-voltage cable with the fault point.
Preferably, three or more groups of parallel high-voltage cables are selected, the high-voltage cables are divided into two parts, and the middle points of the two parts of high-voltage cables are respectively connected to the positive pole and the negative pole of an external power supply.
Preferably, if the first a-end current value or the first B-end current value is the same and is smaller than the preset current standard value, the high-voltage cable is divided into two parts by the midpoint, and the two parts are both regarded as the first fault area.
It is another object of the present invention to provide a system for determining the location of a grid line fault, the system comprising:
the power access module is used for selecting two groups of parallel high-voltage cables and respectively accessing the middle points of the two groups of high-voltage cables to the positive electrode and the negative electrode of an external power supply;
the first measurement module is used for measuring primary currents at two ends of two groups of high-voltage cables respectively to obtain a first group of current values and determine a first fault area, wherein the first group of current values are currents between the same ends of the two groups of high-voltage cables;
the repeated measurement module is used for respectively connecting the middle parts of the two groups of high-voltage cables positioned in the first fault area part to the positive electrode and the negative electrode of an external power supply, respectively measuring primary currents at two ends of the two groups of high-voltage cables positioned in the first fault area part to obtain a second group of current values, determining a second fault area, and repeating the step until the length of the Nth fault area is smaller than a preset value;
and the fault point positioning module is used for respectively measuring the resistance values of the parts, located in the Nth fault area, of the two groups of high-voltage cables and determining the high-voltage cable where the fault point is located.
Preferably, the power supply access module includes:
the cable numbering unit is used for determining the number of the parallel high-voltage cables and numbering the cables according to the arrangement sequence;
the cable selection unit is used for selecting two groups of high-voltage cables for fault positioning each time according to the serial number sequence;
and the equipment connecting unit is used for respectively connecting the midpoints of the two groups of high-voltage cables to the anode and the cathode of an external power supply and connecting the midpoints of the two groups of high-voltage cables to the same end of the two groups of high-voltage cables through a current testing device.
Preferably, the first measurement module includes:
the current measuring unit is used for setting two ends of the high-voltage cable to be an A end and a B end respectively, and the first group of current values comprise a first A end current value between the A ends of the two groups of high-voltage cables and a first B end current value between the B ends of the two groups of high-voltage cables;
and the current comparison unit is used for comparing the first A-end current value with the first B-end current value to obtain a comparison result, if the first A-end current value is greater than the first B-end current value, the fault point is positioned between the midpoint and the B end of the high-voltage cable, otherwise, the fault point is positioned between the midpoint and the A end of the high-voltage cable.
Preferably, the fault point locating module includes:
the resistance measuring unit is used for respectively measuring the resistance values of the parts, located in the Nth fault area, of the two groups of high-voltage cables to obtain two groups of independent resistance values;
and the resistance comparison unit is used for comparing two groups of independent resistance values, and one group of high-voltage cables with large resistance values are high-voltage cables with fault points.
According to the method for determining the position of the power grid line fault, the high-voltage cable is connected with the external power supply, so that lower test voltage is provided for the high-voltage cable, current data of the high-voltage cable is measured to determine the range of the fault point, and the specific range of the fault point is gradually reduced through multiple measurements, so that accurate positioning is finally achieved, and the specific position of the fault point is searched.
Drawings
Fig. 1 is a flowchart of a method for determining a location of a power grid line fault according to an embodiment of the present invention;
fig. 2 is a flowchart of a step of selecting two parallel high-voltage cables and connecting midpoints of the two high-voltage cables to a positive electrode and a negative electrode of an external power supply, respectively, according to an embodiment of the present invention;
FIG. 3 is a flowchart of the steps provided in an embodiment of the present invention to determine a first failure region;
fig. 4 is a flowchart of steps of respectively measuring resistance values of portions of two groups of high-voltage cables, which are located in an nth fault area, and determining a high-voltage cable at a fault point according to an embodiment of the present invention;
fig. 5 is an architecture diagram of a system for determining a location of a grid line fault according to an embodiment of the present invention;
fig. 6 is an architecture diagram of a power access module according to an embodiment of the present invention;
FIG. 7 is a diagram of a first metrology module according to an embodiment of the present invention;
fig. 8 is an architecture diagram of a fault point locating module according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms unless otherwise specified. These terms are only used to distinguish one element from another. For example, a first xx script may be referred to as a second xx script, and similarly, a second xx script may be referred to as a first xx script, without departing from the scope of the present application.
The power lines are mainly divided into overhead lines and cable lines according to the used materials. The cable line is a power line made of cable materials; the overhead distribution line is a distribution line formed by laying power conductors in an overhead mode; an overhead transmission line is a transmission line formed by laying power conductors in an overhead mode. When the electric wire netting circuit broke down, need overhaul through the manual work, but among the current mode of overhauing, it specifically damages the position to be difficult to specifically confirm the cable, and positioning accuracy is low.
According to the invention, the high-voltage cable is connected with an external power supply, so that a lower test voltage is provided for the high-voltage cable, current data measurement is carried out on the high-voltage cable to determine the range of a fault point, and the specific range of the fault point is gradually reduced through multiple measurements, so that accurate positioning is finally realized, and the specific position of the fault point is searched.
As shown in fig. 1, a flowchart of a method for determining a location of a grid line fault according to an embodiment of the present invention is provided, where the method includes:
and S100, selecting two groups of parallel high-voltage cables, and respectively connecting the midpoints of the two groups of high-voltage cables to the positive electrode and the negative electrode of an external power supply.
In the step, two groups of parallel high-voltage cables are selected, and for the high-voltage cables, the surface layers of the high-voltage cables are not provided with insulating layers, so that the insulating layers can be easily punctured by high-voltage electricity transmitted by the high-voltage cables, the dead weight of the high-voltage cables is increased only by arranging the insulating layers, the load of the high-voltage cables is increased, and therefore when measurement is carried out, one group of external power supplies is arranged, the positive pole of each external power supply is connected with the middle point of one group of high-voltage cables, and the negative pole of each external power supply is connected with the other group of high-voltage cables; of course, a plurality of groups of high-voltage cables can be measured simultaneously, three or more groups of parallel high-voltage cables are selected, the high-voltage cables are divided into two parts, and the midpoints of the two parts of the high-voltage cables are respectively connected to the positive pole and the negative pole of the external power supply.
And S200, measuring primary currents at two ends of the two groups of high-voltage cables respectively to obtain a first group of current values, and determining a first fault area, wherein the first group of current values are currents between the same ends of the two groups of high-voltage cables.
In the step, two ends of the high-voltage cable are respectively connected with an ammeter, and when the high-voltage cable is connected, two terminals of the same group of ammeters are respectively connected with the same ends of the two groups of high-voltage cables, so that two loops are formed between the two groups of high-voltage cables, the two groups of ammeters respectively measure the current value in one loop, and the fault part in the high-voltage cable is judged by comparing the current values in the two loops to determine a first fault area.
S300, respectively connecting the middle parts of the two groups of high-voltage cables positioned in the first fault area part to the positive electrode and the negative electrode of an external power supply, respectively measuring primary currents at two ends of the two groups of high-voltage cables positioned in the first fault area part to obtain a second group of current values, determining a second fault area, and repeating the step until the length of the Nth fault area is smaller than a preset value.
In this step, after the step S200, the two groups of high-voltage cables are respectively connected to the positive electrode and the negative electrode of the external power supply at the middle of the first fault area portion, the fault range in the high-voltage cables is reduced by half, and according to this step, the execution is repeated, and the fault range is reduced by half each time, so that for a 500-meter line, after one detection, the fault range is reduced to 250 meters, and after two detections, the fault range is reduced to 125 meters, according to this step, until the fault range is smaller than a preset value, for example, 5 meters.
And S400, respectively measuring the resistance values of the parts, located in the Nth fault area, of the two groups of high-voltage cables, and determining the high-voltage cable where the fault point is located.
In this step, the resistance values of the parts of the two groups of high-voltage cables, which are respectively located in the nth fault area, are respectively measured, for longer high-voltage cables, by using the above operation, the reduced length of the fault area detected each time is gradually reduced, so that the smaller the fault area is, the lower the detection yield by using the above operation is, when the fault range is smaller than the preset value, the detection mode is changed, the resistance value of the nth fault area part on each high-voltage cable is directly measured, and the high-voltage cable at which the fault point is located can be determined, then the fault point is found by using manpower, and since the nth fault area part is very small, the finding efficiency by using the manpower is very high.
As shown in fig. 2, as a preferred embodiment of the present invention, the step of selecting two parallel groups of high voltage cables and connecting the middle points of the two groups of high voltage cables to the positive electrode and the negative electrode of the external power supply respectively includes:
and S101, determining the number of the parallel high-voltage cables, and numbering according to the arrangement sequence.
In this step, the number of the parallel high-voltage cables is determined, when the high-voltage cables are erected, the high-voltage cables are arranged in parallel, and the distance between the adjacent cables is fixed, so that numbering can be performed by taking one high-voltage cable on one side of the high-voltage cables as a starting point, and numerical numbering or letter numbering can be adopted during numbering.
And S102, selecting two groups of high-voltage cables for fault positioning each time according to the numbering sequence.
In this step, selection is performed according to the numbering sequence, specifically, two groups of high-voltage cables with the smallest number are selected first, and if the letter number is adopted, the high-voltage cables corresponding to two letters are selected each time according to the letter sequence.
And S103, respectively connecting the middle points of the two groups of high-voltage cables to the positive electrode and the negative electrode of an external power supply, and connecting the same ends of the two groups of high-voltage cables through a current testing device.
In this step, the midpoints of the two groups of high-voltage cables are respectively connected to the positive electrode and the negative electrode of the external power supply, if the multiple groups of high-voltage cables are detected at the same time, the same positions of the high-voltage cables in the same part are connected through the conducting wires, and the same ends of the two groups of high-voltage cables are connected through the current testing device.
As shown in fig. 3, as a preferred embodiment of the present invention, the step of determining the first failure area specifically includes:
s201, setting two ends of a high-voltage cable as an A end and a B end respectively, wherein a first group of current values comprise a first A-end current value between the A ends of the two groups of high-voltage cables and a first B-end current value between the B ends of the two groups of high-voltage cables.
In this step, two ends of the high-voltage cable are set as an end a and an end B, respectively, so that during measurement, a set of ammeter is arranged between the two sets of end a, and a set of ammeter is arranged between the two sets of end B, thereby obtaining two sets of current values, i.e., a first end a current value and a first end B current value.
S202, comparing the first A-end current value with the first B-end current value to obtain a comparison result, wherein if the first A-end current value is larger than the first B-end current value, the fault point is located between the midpoint and the B end of the high-voltage cable, otherwise, the fault point is located between the midpoint and the A end of the high-voltage cable.
As shown in fig. 4, as a preferred embodiment of the present invention, the step of respectively measuring the resistance values of the two groups of high voltage cables in the nth fault area, and determining the high voltage cable at the fault point specifically includes:
s401, respectively measuring the resistance values of the two groups of high-voltage cables in the Nth fault area part to obtain two groups of independent resistance values.
In this step, the resistance values of the two groups of high-voltage cables which are respectively positioned at the Nth fault area part are respectively measured, when the length of the Nth fault area is smaller than a preset value, the measuring mode needs to be changed, otherwise, the detection yield is gradually reduced, at the moment, the ohmmeters are directly connected to the two ends of the Nth fault area part on the high-voltage cables, so that the resistance values of the high-voltage cables are detected, and the number of the detected high-voltage cables is the same as the number of the obtained resistance values.
And S402, comparing the two groups of independent resistance values, wherein the group of high-voltage cables with the large resistance value is the high-voltage cable with the fault point.
In the step, two groups of independent resistance values are compared, and for the high-voltage cable with a fault, the stranded wire of the high-voltage cable is partially broken, so that the cross section area of the position is reduced, the resistance is correspondingly increased, and the fault point on the high-voltage cable with the larger resistance value can be determined by comparing the resistance values.
As shown in fig. 5, a system for determining a location of a grid line fault according to an embodiment of the present invention includes:
and the power supply access module 100 is used for selecting two groups of parallel high-voltage cables and respectively accessing the midpoints of the two groups of high-voltage cables to the anode and the cathode of an external power supply.
In the system, the power access module 100 selects two groups of parallel high-voltage cables, and for the high-voltage cables, the surface layer is not provided with an insulating layer, and then the high-voltage power transmitted by the high-voltage cables can easily puncture the insulating layer, so that the self weight of the high-voltage cables is increased only by arranging the insulating layer, and the load of the high-voltage cables is increased; of course, a plurality of groups of high-voltage cables can be measured simultaneously, three or more groups of parallel high-voltage cables are selected, the high-voltage cables are divided into two parts, and the midpoints of the two parts of the high-voltage cables are respectively connected to the positive pole and the negative pole of the external power supply.
The first measurement module 200 is configured to measure primary currents at two ends of two groups of high voltage cables, respectively, obtain a first group of current values, and determine a first fault area, where the first group of current values is a current between the same ends of the two groups of high voltage cables.
In the system, the first measuring module 200 is connected to the current meters at the two ends of the high-voltage cable, and when the high-voltage cable is connected, the two terminals of the same current meter are connected to the same ends of the two groups of high-voltage cables, so as to form two loops between the two groups of high-voltage cables, and the two groups of current meters measure the current value in one loop, and by comparing the current values in the two loops, the fault part in the high-voltage cable is judged, and the first fault area is determined.
And the repeated measuring module 300 is used for respectively connecting the middle parts of the two groups of high-voltage cables positioned in the first fault area part to the anode and the cathode of an external power supply, respectively measuring primary currents at two ends of the two groups of high-voltage cables positioned in the first fault area part to obtain a second group of current values, determining a second fault area, and repeating the step until the length of the Nth fault area is smaller than a preset value.
In the system, after the step S200, the repeated measurement module 300 connects the two groups of high-voltage cables to the positive electrode and the negative electrode of the external power supply at the middle of the first fault area portion respectively, the fault range in the high-voltage cables is reduced by half, according to the step, the repeated measurement is performed, the fault range is reduced by half each time, then for a 500-meter line, after one detection, the fault range is reduced to 250 meters, after two detections, the fault range is reduced to 125 meters, according to the step, until the fault range is smaller than a preset value, such as 5 meters.
And the fault point positioning module 400 is configured to measure resistance values of the two groups of high-voltage cables in the nth fault area, respectively, and determine the high-voltage cable where the fault point is located.
In the system, the fault point positioning module 400 measures the resistance values of the two groups of high-voltage cables respectively located in the nth fault area, and for longer high-voltage cables, the reduced length of the fault area detected each time is gradually reduced by using the above operation, so that the detection yield is lower by using the above operation as the fault area is smaller, when the fault range is smaller than the preset value, the detection mode is changed, the resistance value of the nth fault area on each high-voltage cable is directly measured, and the high-voltage cable where the fault point is located can be determined, and then the fault point is searched manually.
As shown in fig. 6, as a preferred embodiment of the present invention, the power access module 100 includes:
the cable numbering unit 101 is used for determining the number of the parallel high-voltage cables and numbering the cables according to the arrangement sequence.
In this module, the cable number unit 101 determines the number of parallel high voltage cables, and when the high voltage cables are erected, the high voltage cables are arranged in parallel, and the distance between adjacent cables is fixed, so that the high voltage cables can be numbered by using a high voltage cable on one side of the high voltage cables as a starting point, and the high voltage cables can be numbered by using numbers or letter numbers.
And the cable selection unit 102 is used for selecting two groups of high-voltage cables for fault location each time according to the numbering sequence.
In this module, the cable selection unit 102 selects two groups of high-voltage cables with the smallest number according to the numbering sequence, specifically, selects two groups of high-voltage cables with the smallest number first, and if the letter number is adopted, selects the high-voltage cables corresponding to two letters each time according to the letter sequence.
And the equipment connecting unit 103 is used for respectively connecting the midpoints of the two groups of high-voltage cables to the positive electrode and the negative electrode of an external power supply, and connecting the midpoints of the two groups of high-voltage cables at the same end through a current testing device.
In this module, the device connection unit 103 connects the middle points of the two groups of high voltage cables to the positive electrode and the negative electrode of the external power supply, respectively, and if the multiple groups of high voltage cables are detected at the same time, the same positions of the high voltage cables in the same part are connected through the conducting wires, and the same ends of the two groups of high voltage cables are connected through the current testing device.
As shown in fig. 7, as a preferred embodiment of the present invention, the first measurement module 200 includes:
the current measuring unit 201 is configured to set two ends of the high voltage cable as an a end and a B end, respectively, and the first group of current values include a first a end current value between the a ends of the two groups of high voltage cables and a first B end current value between the B ends of the two groups of high voltage cables.
In this module, the current measuring unit 201 sets the two ends of the high voltage cable as the a end and the B end respectively, so that during measurement, a set of ammeter is disposed between the two sets of a ends, and a set of ammeter is disposed between the two sets of B ends, so as to obtain two sets of current values, i.e., a first a end current value and a first B end current value.
And the current comparison unit 202 is configured to compare the first a-terminal current value with the first B-terminal current value to obtain a comparison result, where if the first a-terminal current value is greater than the first B-terminal current value, the fault point is located between the midpoint of the high-voltage cable and the B-terminal, and otherwise, the fault point is located between the midpoint of the high-voltage cable and the a-terminal.
As shown in fig. 8, as a preferred embodiment of the present invention, the fault point locating module 400 includes:
and the resistance measuring unit 401 is configured to measure the resistance values of the two groups of high-voltage cables in the nth fault area respectively, so as to obtain two groups of independent resistance values.
In this module, the resistance measuring unit 401 measures the resistance values of the two groups of high-voltage cables respectively located in the nth fault area, when the length of the nth fault area is smaller than a preset value, the measuring mode needs to be changed, otherwise, the detection yield is gradually reduced, and at this time, the ohmmeter is directly connected to the two ends of the nth fault area on the high-voltage cables, so as to detect the resistance values of the high-voltage cables, and the number of the detected high-voltage cables is the same as the number of the obtained resistance values.
And the resistance comparison unit 402 is used for comparing two groups of independent resistance values, wherein a group of high-voltage cables with a large resistance value is a high-voltage cable with a fault point.
In this module, the resistance comparing unit 402 compares two sets of independent resistance values, and for a failed high-voltage cable, a twisted wire of the failed high-voltage cable is partially broken, so that the cross-sectional area of the broken wire is reduced, the resistance is correspondingly increased, and by comparing the resistance values, it can be determined that a failure point exists on the high-voltage cable with a larger resistance value.
It should be understood that, although the steps in the flowcharts of the embodiments of the present invention are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in various embodiments may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a non-volatile computer-readable storage medium, and can include the processes of the embodiments of the methods described above when the program is executed. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. A method for determining the location of a grid line fault, the method comprising:
determining the number of the parallel high-voltage cables, and numbering according to the arrangement sequence; according to the numbering sequence, selecting two groups of high-voltage cables for fault positioning each time; connecting the midpoints of the two groups of high-voltage cables to the positive electrode and the negative electrode of an external power supply respectively, and connecting the same ends of the two groups of high-voltage cables through a current testing device;
measuring primary currents at two ends of two groups of high-voltage cables respectively to obtain a first group of current values, and determining a first fault area, wherein the first group of current values are currents between the same ends of the two groups of high-voltage cables;
respectively connecting the middle parts of the two groups of high-voltage cables positioned in the first fault area part to the positive electrode and the negative electrode of an external power supply, respectively measuring primary currents at two ends of the two groups of high-voltage cables positioned in the first fault area part to obtain a second group of current values, determining a second fault area, and repeating the step until the length of the Nth fault area is smaller than a preset value;
respectively measuring the resistance values of the parts, located in the Nth fault area, of the two groups of high-voltage cables, and determining the high-voltage cable where a fault point is located;
the step of determining the first fault area specifically includes:
setting two ends of a high-voltage cable as an A end and a B end respectively, wherein a first group of current values comprise a first A-end current value between the A ends of the two groups of high-voltage cables and a first B-end current value between the B ends of the two groups of high-voltage cables;
comparing the first A-end current value with the first B-end current value to obtain a comparison result, wherein if the first A-end current value is greater than the first B-end current value, the fault point is located between the midpoint and the B-end of the high-voltage cable, otherwise, the fault point is located between the midpoint and the A-end of the high-voltage cable;
the step of respectively measuring the resistance values of the parts, located in the Nth fault area, of the two groups of high-voltage cables and determining the high-voltage cable where the fault point is located specifically comprises the following steps:
respectively measuring the resistance values of the two groups of high-voltage cables in the Nth fault area part to obtain two groups of independent resistance values;
and comparing the two groups of independent resistance values, wherein the high-voltage cable with the large resistance value is the high-voltage cable with the fault point.
2. The method according to claim 1, wherein three or more parallel high-voltage cables are selected, the high-voltage cables are divided into two parts, and the midpoints of the two parts of the high-voltage cables are respectively connected to the positive electrode and the negative electrode of an external power supply.
3. The method according to claim 1, wherein if the first a-side current value or the first B-side current value is the same and is smaller than a predetermined current standard value, the high-voltage cable is divided into two parts by the midpoint, and the two parts are both regarded as the first fault area.
4. A system for determining the location of a grid line fault, the system comprising:
the power supply access module is used for selecting two groups of parallel high-voltage cables and respectively accessing the midpoints of the two groups of high-voltage cables to the positive electrode and the negative electrode of an external power supply; the first measurement module is used for measuring primary currents at two ends of two groups of high-voltage cables respectively to obtain a first group of current values and determine a first fault area, wherein the first group of current values are currents between the same ends of the two groups of high-voltage cables;
the repeated measurement module is used for respectively connecting the middle parts of the two groups of high-voltage cables positioned in the first fault area part to the positive electrode and the negative electrode of an external power supply, respectively measuring primary currents at two ends of the two groups of high-voltage cables positioned in the first fault area part to obtain a second group of current values, determining a second fault area, and repeating the step until the length of the Nth fault area is smaller than a preset value;
the fault point positioning module is used for respectively measuring the resistance values of the parts, located in the Nth fault area, of the two groups of high-voltage cables and determining the high-voltage cable where the fault point is located;
the power access module comprises:
the cable numbering unit is used for determining the number of the parallel high-voltage cables and numbering the cables according to the arrangement sequence;
the cable selection unit is used for selecting two groups of high-voltage cables for fault positioning each time according to the serial number sequence;
the device connecting unit is used for respectively connecting the midpoints of the two groups of high-voltage cables to the positive electrode and the negative electrode of an external power supply and connecting the midpoints of the two groups of high-voltage cables to the same end of the two groups of high-voltage cables through a current testing device;
the first measurement module includes:
the current measuring unit is used for setting two ends of the high-voltage cable to be an A end and a B end respectively, and the first group of current values comprise a first A end current value between the A ends of the two groups of high-voltage cables and a first B end current value between the B ends of the two groups of high-voltage cables;
the current comparison unit is used for comparing the magnitude of the first A-end current value with the magnitude of the first B-end current value to obtain a comparison result, if the first A-end current value is larger than the first B-end current value, the fault point is positioned between the midpoint and the B end of the high-voltage cable, otherwise, the fault point is positioned between the midpoint and the A end of the high-voltage cable;
the fault point locating module includes:
the resistance measuring unit is used for respectively measuring the resistance values of the two groups of high-voltage cables in the Nth fault area part to obtain two groups of independent resistance values;
and the resistance comparison unit is used for comparing two groups of independent resistance values, and one group of high-voltage cables with large resistance values are high-voltage cables with fault points.
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