CN113295965A - Distribution network ground fault positioning method, system and terminal - Google Patents
Distribution network ground fault positioning method, system and terminal Download PDFInfo
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- CN113295965A CN113295965A CN202110570137.0A CN202110570137A CN113295965A CN 113295965 A CN113295965 A CN 113295965A CN 202110570137 A CN202110570137 A CN 202110570137A CN 113295965 A CN113295965 A CN 113295965A
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- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000007689 inspection Methods 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 claims description 46
- 238000004891 communication Methods 0.000 claims description 26
- 230000011218 segmentation Effects 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 6
- 230000002159 abnormal effect Effects 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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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
- G01R31/52—Testing for short-circuits, leakage current or ground faults
Abstract
The application relates to a distribution network ground fault positioning method, which comprises the following steps: s1, detecting the ground fault signals of each line of the distribution network in real time, judging whether the line has ground fault according to the ground fault signals, and acquiring a fault line; s2, controlling a connecting switch to connect the fault line with an auxiliary line; s3, controlling the controllable sectional switches according to a set sectional algorithm to section the fault line so as to gradually reduce the range to determine a fault interval, wherein the determined fault interval is between adjacent controllable sectional switches; and S4, checking the fault section determined by the S3 by the inspection terminal, and accurately positioning the fault position. The application relates to a distribution network ground fault positioning system and a routing inspection terminal for positioning the distribution network ground fault for implementing the method. The distribution network ground fault positioning method, the distribution network ground fault positioning system and the distribution network ground fault positioning terminal are low in cost, high in positioning efficiency and small in positioning power failure range and short in time.
Description
Technical Field
The application relates to the technical field of ground fault positioning, in particular to a distribution network ground fault positioning method, a distribution network ground fault positioning system and a distribution network ground fault positioning terminal.
Background
When the distribution network has an earth fault, the position of the earth fault of the distribution network needs to be positioned in time.
In the prior art, a commonly used distribution network ground fault positioning method generally adopts a trial-pull substation outgoing switch and a distribution network line section switch to search for a ground fault point, and the judgment mode is time-consuming and labor-consuming, has a wide power failure range, easily causes the distribution network running hours to be lower than the national network standard requirement, and influences the orderly development of power supply enterprise operator environment work. At present, a mode is also provided in which a sensor for detecting an abnormal ground signal is arranged along each distribution network, and a ground fault is positioned by the cooperation of the sensors.
Disclosure of Invention
To solve the above technical problem or to at least partially solve the above technical problem.
In a first aspect, the present application provides a method for locating a distribution network ground fault, including:
s1, detecting the ground fault signals of each line of the distribution network in real time, judging whether the line has ground fault according to the ground fault signals, and acquiring a fault line;
s2, controlling a connecting switch to connect the fault line with an auxiliary line;
s3, controlling the controllable sectional switches according to a set sectional algorithm to section the fault line so as to gradually reduce the range to determine a fault interval, wherein the determined fault interval is between adjacent controllable sectional switches;
and S4, checking the fault section determined by the S3 by the inspection terminal, and accurately positioning the fault position.
Further, the auxiliary line is a line in which no ground fault occurs.
Furthermore, when the control connecting switch connects the fault line with the auxiliary line, the controllable section switch in the middle of the fault line is controlled to be disconnected;
and controlling the connecting switch to close the connection fault line and the auxiliary line.
Furthermore, in the process of sequentially switching off the controllable section switch on the fault line:
firstly, controlling the next controllable sectional switch to be disconnected;
and then the controllable sectional switch which is opened before is controlled to be closed.
Furthermore, the segmentation algorithm is set to include any one or combination of dichotomy, grouping method and one-way stepwise traversal method.
In a second aspect, the present application provides a distribution network ground fault positioning system, including:
respectively connecting distribution network lines of the transformer substation;
the ground fault detection terminal is arranged at each distribution network line and used for measuring a distribution network line ground fault signal;
a plurality of controllable section switches are arranged on the network distribution line;
one end of the distribution network line, which is far away from the transformer substation, is provided with a connecting switch, and the connecting switch is used for connecting different distribution network lines;
the control background is electrically connected with the controllable section switch and the connecting switch and controls the controllable section switch and the connecting switch to be switched on or off; the control background is electrically connected with the ground fault detection terminal.
Furthermore, the control background configures the topological relations of all the distribution network lines, the connecting switches and the controllable section switches;
the control background receives the information of the ground fault detection terminal and determines a fault line according to the information of the ground fault detection terminal;
and the control background selects an auxiliary line of the fault line according to the topological relation of the distribution network line, the connecting switch and the controllable section switch.
In a third aspect, the application provides a distribution network ground fault positioning inspection terminal, which comprises a mobile part and a handheld part, wherein,
the mobile part comprises a driving unit, a magnetic field detection unit, a first wireless communication unit, a first control unit and a first power supply unit; the driving unit controls the moving part to move along the distribution network line; the magnetic field detection unit detects an induced magnetic field of a distribution network line, and the first power supply unit is electrically connected with the first control unit, the magnetic field detection unit, the driving unit and the first wireless communication unit;
the handheld portion is provided with a second wireless communication unit, the second wireless communication unit is in wireless connection with the first wireless communication unit, the second wireless communication unit is electrically connected with a second control unit, the second control unit is electrically connected with the input unit and the display unit, the handheld portion is provided with a second power supply unit, and the second power supply unit is electrically connected with the second communication unit, the second control unit, the input unit and the display unit.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the distribution network ground fault positioning method, the system applying the distribution network ground fault positioning method and the inspection terminal are provided. According to the method and the device, whether the distribution network line has the ground fault is detected by detecting the abnormal signal of the distribution network line through the ground fault detection terminal, and the distribution network line is provided with the group of ground fault detection terminals, so that the cost is low;
the method comprises the steps that a fault line is determined by collecting information of a ground fault detection terminal through a control background, a connecting switch is controlled to connect the fault line with an auxiliary line, the fault line on one side of a disconnected controllable sectional switch is guaranteed to be powered by a fault line transformer substation, and the auxiliary line transformer substation is arranged on the other side of the disconnected controllable sectional switch, so that the power failure range can be effectively reduced, and the power failure time is reduced;
the control background selects a set algorithm to control the disconnection of the controllable section switches according to the quantity of the controllable section switches on the fault line so as to position the grounding fault, so that the calculated quantity is reduced, the grounding fault can be quickly positioned between the adjacent controllable section switches, and then the detection personnel can accurately detect and position the controllable section switches with shorter distance through the inspection terminal. The positioning efficiency can be effectively improved, and the power failure time is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic distribution diagram of distribution network lines, controllable section switches, connection switches, and ground fault detection terminals;
fig. 2 is a schematic structural diagram of a power distribution network ground fault positioning system according to an embodiment of the present disclosure;
fig. 3 is a flowchart of a method for locating a ground fault of a power distribution network according to an embodiment of the present application;
FIG. 4 is a flow chart of a one-way step-by-step traversal method provided by an embodiment of the present application;
fig. 5 is a schematic structural diagram of a mobile part of the power distribution network ground fault positioning inspection terminal provided by the embodiment of the application;
fig. 6 is a schematic circuit architecture diagram of a mobile unit according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a handheld portion of a power distribution network ground fault positioning inspection terminal provided in the embodiment of the present application;
fig. 8 is a schematic circuit architecture diagram of a handheld portion according to an embodiment of the present disclosure.
Reference numerals and meanings in the drawings:
100. contraband shaped shell, 200 roller, 300 connecting rod, 400 first shell, 500 motor, 600 second shell.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example 1
Referring to fig. 1 and 2 in combination, the present application provides a system for locating ground faults in a power distribution network. The ground fault detection device comprises a control background, wherein the control background is electrically connected with the ground fault detection terminal. In a specific implementation process, the control background may be connected to the plurality of ground fault detection terminals through an adapter. The adapter is used for switching the plurality of ground fault detection terminals to the control background and communicating in a data line transmission mode. In a specific implementation process, the control background can be wirelessly connected with the ground fault detection terminal and communicates in a wireless transmission mode.
The ground fault detection terminal is arranged at each distribution network line and used for measuring a distribution network line ground fault signal; in this embodiment, the ground fault signal is required to be a stable steady-state quantity when the ground fault exists.
The control background is electrically connected with the plurality of controllable section switches and the plurality of connecting switches; in the specific implementation process, the distribution network line is connected with a transformer substation, the controllable section switches are distributed on the distribution network line, and when the power is normally supplied, the controllable section switches on the distribution network line are closed. In a specific implementation process, a connecting switch is arranged at one end of a distribution network line, which is far away from a transformer substation, and the connecting switch is used for connecting different distribution network lines; and when the power is supplied normally, the connecting switch is disconnected.
The control background is configured with topological relations of all distribution network lines, the connecting switches and the controllable section switches, and the topological relations are recorded by the serial numbers of the connecting switches and the serial numbers of the controllable section switches in the specific implementation process; the control background receives the information of the ground fault detection terminal and determines a fault line according to the information of the ground fault detection terminal; the control background selects an auxiliary line of the fault line according to the topological relation of the distribution network line, the connecting switches and the controllable section switches, the control background controls the controllable section switches in the middle of the fault line to be switched off, and the control background controls the corresponding connecting switches to be switched on so that the fault line is connected with the auxiliary line.
And the control background acquires a ground fault detection terminal on the auxiliary line and a ground fault detection terminal on the fault line. The control background acquires the number of the controllable sectional switches on the fault line and selects a sectional algorithm, and controls the controllable sectional switches on the fault line to be switched on and off through the sectional algorithm, so that the fault line is divided into two sections, one section is powered by a fault line transformer substation, and the other section is powered by an auxiliary line transformer substation.
Example 2
Referring to fig. 3, the present application provides a distribution network ground fault location method. The distribution network ground fault positioning method comprises the following steps:
s1, detecting the ground fault signals of each line of the distribution network in real time, judging whether the line has ground fault according to the ground fault signals, and acquiring a fault line; in the specific implementation process, the control background acquires a ground fault signal measurement result from the ground fault detection terminal, and judges whether the distribution network line has a ground fault according to the measurement result, so that the line with the ground fault is used as a fault line.
S2, controlling a connecting switch to connect the fault line with an auxiliary line; in a specific implementation process, the auxiliary line is a line without a ground fault. And the control background stores the topological relation among the distribution network lines, the controllable section switches and the connecting switches. And the optional auxiliary line set of the fault line can be confirmed according to the fault line and the topological relation. And considering the load condition of each distribution network line substation in the auxiliary line set, the control background selects the optimal auxiliary line from the auxiliary line set (the allowable load capacity of the optimal auxiliary line is maximum).
S3, controlling the controllable sectional switches according to a set sectional algorithm to section the fault line so as to gradually reduce the range to determine a fault interval, wherein the determined fault interval is between adjacent controllable sectional switches; the specific implementation process comprises the following steps:
the control background counts the number of controllable section switches on a fault line;
the control background selects a segmentation algorithm according to the number of the controllable segmentation switches; the segmentation algorithm includes a dichotomy and a one-way stepwise traversal.
Specifically, a quantity threshold may be set, and a segmentation algorithm may be selected by comparing the relationship between the number of segmentation switches and the quantity threshold. Such as:
adopting a one-way gradual traversal method when the number value of the section switch is smaller than the number threshold value;
referring to fig. 4, the controllable section switch is controlled by the one-way stepwise traversal method to strip a section of line from a fault line, the controllable section switch is controlled to connect the section of line to an auxiliary line, whether a fault is prompted by a ground fault detection terminal of the auxiliary line is judged, and if the fault is prompted, a fault section is the section. And controlling the controllable section switches to be sequentially switched off and switched on in a direction away from the auxiliary line by a one-way gradual traversal method until the control background judges a fault section according to the ground fault detection terminal on the fault line and the ground fault detection terminal on the auxiliary line. In the control process: firstly, controlling a controllable section switch closest to an auxiliary line in a fault line to be switched off; and controlling the connecting switch to close the connection fault line and the auxiliary line. Firstly, controlling the next controllable sectional switch to be disconnected; and then the controllable sectional switch which is opened before is controlled to be closed.
When the number value of the section switches is larger than the number threshold value, a dichotomy is adopted;
the bisection method controls the controllable section switch at the middle position of the section to be determined to be disconnected, and the section to be determined is divided into two sections by the controllable section switch;
selecting a next section to be determined according to the alarm conditions of the ground fault detection terminals of the fault line and the auxiliary line; when the ground fault detection terminal of the fault line gives an alarm, the next section to be determined is a section far away from the auxiliary line in the section to be determined, when the ground fault detection terminal of the auxiliary line gives an alarm, the next section to be determined is a section near the auxiliary line in the section to be determined,
recursion is continued until a failed segment is acquired.
And S4, checking the fault section determined by the S3 by the inspection terminal, and accurately positioning the fault position.
Example 3
The application provides a terminal of patrolling and examining of joining in marriage net ground fault location, including removal portion and handheld portion, wherein, refer to figure 5 removal portion structurally includes insulating v 21274, shape shell 100, Contraband rotation connection a plurality of insulating gyro wheels 200 in shape shell 100, dismantled and assembled the insulating connecting rod 300 that sets up on Contraband shape shell 100, connect first casing 400 on the connecting rod 300.
In a specific implementation process, referring to fig. 6, one of the rollers 200 is connected to a driving unit, the driving unit includes a driving circuit and a motor 500, the driving circuit is electrically connected to the motor 500, an output shaft of the motor is connected to one of the rollers 200, and the driving circuit is electrically connected to the first control unit.
The first control unit is electrically connected with the magnetic field detection unit and the first wireless communication unit, and the magnetic field detection unit detects an induced magnetic field of the distribution network line. The first control unit, the magnetic field detection unit, the driving unit and the first wireless communication unit are electrically connected with the first power supply unit and powered by the first power supply unit. In a specific implementation process, the first control unit, the magnetic field detection unit, the first wireless communication unit, and the first power supply unit are disposed in the first housing 400.
The handheld portion comprises a second shell 600, a second wireless communication unit is arranged in the second shell 600, the second wireless communication unit is in wireless connection with the first wireless communication unit, the second wireless communication unit is electrically connected with a second control unit, the second control unit is electrically connected with an input unit and a display unit, the handheld portion is provided with a second power supply unit, and the second power supply unit is electrically connected with the second communication unit, the second control unit, the input unit and the display unit.
In a specific implementation process, the first control unit and the second control unit adopt STM single-chip microcomputers, the first wireless communication unit and the second wireless communication unit adopt CH581 Bluetooth communication units, the magnetic field detection unit adopts an MS3A magnetic sensor, and the input unit is a key input unit.
The first power supply unit and the second power supply unit both comprise rechargeable lithium batteries, the rechargeable lithium batteries are electrically connected with a DC-DC circuit, and the DC-DC circuit is electrically connected with a step-down voltage stabilizer. The rechargeable battery is electrically connected with the charging circuit.
The application provides a distribution network ground fault positioning method, a system applying the distribution network ground fault positioning method and an inspection terminal. According to the method and the device, whether the distribution network line has the ground fault is detected by detecting the abnormal signal of the distribution network line through the ground fault detection terminal, and the distribution network line is provided with the group of ground fault detection terminals, so that the cost is low;
the method comprises the steps that a fault line is determined by collecting information of a ground fault detection terminal through a control background, a connecting switch is controlled to connect the fault line with an auxiliary line, the fault line on one side of a disconnected controllable sectional switch is guaranteed to be powered by a fault line transformer substation, and the auxiliary line transformer substation is arranged on the other side of the disconnected controllable sectional switch, so that the power failure range can be effectively reduced, and the power failure time is reduced;
the control background controls the disconnection of the controllable section switches by adopting a bisection method to position the grounding fault, the grounding fault can be quickly positioned between the adjacent controllable section switches, and then the detection personnel can accurately detect and position the controllable section switches with shorter distance through the inspection terminal. The positioning efficiency can be effectively improved, and the power failure time is reduced.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A distribution network ground fault positioning method is characterized by comprising the following steps:
s1, detecting the ground fault signals of each line of the distribution network in real time, judging whether the line has ground fault according to the ground fault signals, and acquiring a fault line;
s2, controlling a connecting switch to connect the fault line with an auxiliary line;
s3, controlling the controllable sectional switches according to a set sectional algorithm to section the fault line so as to gradually reduce the range to determine a fault interval, wherein the determined fault interval is between adjacent controllable sectional switches;
and S4, checking the fault section determined by the S3 by the inspection terminal, and accurately positioning the fault position.
2. The distribution network ground fault location method of claim 1, wherein the auxiliary line is a line that has no ground fault.
3. The distribution network ground fault location method of claim 1, wherein when a connection switch is controlled to connect the fault line with an auxiliary line,
firstly, the controllable section switch of the fault line is controlled to be switched off;
and controlling the connecting switch to close the connection fault line and the auxiliary line.
4. The distribution network ground fault location method of claim 1, wherein in the process of sequentially switching off the controllable section switches on the fault line:
firstly, controlling the next controllable sectional switch to be disconnected;
and then the controllable sectional switch which is opened before is controlled to be closed.
5. The distribution network ground fault location method of claim 1, wherein the setting of the segmentation algorithm includes bisection and one-way stepwise traversal, the number of controllable segmentation switches on the fault line is obtained, and the segmentation algorithm is selected according to the number of controllable segmentation switches.
6. A distribution network ground fault positioning system is characterized by comprising
Respectively connecting distribution network lines of the transformer substation;
the ground fault detection terminal is arranged at each distribution network line and used for measuring a distribution network line ground fault signal;
a plurality of controllable section switches are arranged on the network distribution line;
one end of the distribution network line, which is far away from the transformer substation, is provided with a connecting switch, and the connecting switch is used for connecting different distribution network lines;
the control background is electrically connected with the controllable section switch and the connecting switch and controls the controllable section switch and the connecting switch to be switched on or off; the control background is electrically connected with the ground fault detection terminal.
7. The distribution network ground fault positioning system of claim 6, wherein the control background configures topological relationships of all distribution network lines, the connection switches and the controllable section switches;
the control background receives the information of the ground fault detection terminal and determines a fault line according to the information of the ground fault detection terminal;
and the control background selects an auxiliary line of the fault line according to the topological relation of the distribution network line, the connecting switch and the controllable section switch.
8. An inspection terminal for positioning the ground fault of a distribution network is characterized by comprising a mobile part and a handheld part, wherein,
the mobile part comprises a driving unit, a magnetic field detection unit, a first wireless communication unit, a first control unit and a first power supply unit; the first control unit is electrically connected with the driving unit, the magnetic field detection unit and the first wireless communication unit, and the driving unit controls the moving part to move along a distribution network line; the magnetic field detection unit detects an induced magnetic field of a distribution network line, and the first power supply unit is electrically connected with the first control unit, the magnetic field detection unit, the driving unit and the first wireless communication unit;
the handheld portion is provided with a second wireless communication unit, the second wireless communication unit is in wireless connection with the first wireless communication unit, the second wireless communication unit is electrically connected with a second control unit, the second control unit is electrically connected with the input unit and the display unit, the handheld portion is provided with a second power supply unit, and the second power supply unit is electrically connected with the second communication unit, the second control unit, the input unit and the display unit.
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| CN202110570137.0A CN113295965A (en) | 2021-05-25 | 2021-05-25 | Distribution network ground fault positioning method, system and terminal |
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| CN112557805A (en) * | 2020-10-29 | 2021-03-26 | 广西电网有限责任公司南宁供电局 | Auxiliary device and method for quickly searching faults of overhead line |
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Application publication date: 20210824 |