CN109387733A - A kind of distribution circuit single-phase earth fault localization method and system - Google Patents

A kind of distribution circuit single-phase earth fault localization method and system Download PDF

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Publication number
CN109387733A
CN109387733A CN201811573622.8A CN201811573622A CN109387733A CN 109387733 A CN109387733 A CN 109387733A CN 201811573622 A CN201811573622 A CN 201811573622A CN 109387733 A CN109387733 A CN 109387733A
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China
Prior art keywords
detection terminal
mode voltage
zero mode
host computer
fault
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CN201811573622.8A
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Chinese (zh)
Inventor
刘红文
徐雨
王科
杨庆
聂鼎
杨金东
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Electric Power Research Institute of Yunnan Power Grid Co Ltd
Electric Power Research Institute of Yunnan Power System Ltd
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Electric Power Research Institute of Yunnan Power System Ltd
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Priority to CN201811573622.8A priority Critical patent/CN109387733A/en
Publication of CN109387733A publication Critical patent/CN109387733A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/081Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/088Aspects of digital computing
    • YGENERAL 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
    • Y04INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04SSYSTEMS 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
    • Y04S10/00Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52Outage or fault management, e.g. fault detection or location

Abstract

The application provides a kind of distribution circuit single-phase earth fault localization method and system, wherein the described method includes: on detection terminal acquisition distribution line three-phase electricity voltage signal, and phase-model transformation is carried out to voltage signal, obtains zero mode voltage;In the case where zero mode voltage is not equal to the first preset threshold, zero mode voltage is transmitted to host computer;If zero mode voltage is greater than the second preset threshold, and the slope of the corresponding wavefront of zero mode voltage is greater than third predetermined threshold value, and host computer calculates fault point to the distance for detecting terminal using traveling wave damped method;According to fault point to the distance of detection terminal, the position of singlephase earth fault is determined.In method provided by the present application, utilize the position of zero mode voltage traveling wave attenuation characteristic positioning singlephase earth fault, zero mode voltage wavefront easily identifies and precision is higher, abort situation can be quickly found out, remove a hidden danger, solve the problems, such as in conventional mapping methods due to it is to be checked measurement it is weaker caused by positioning accuracy it is not high.

Description

A kind of distribution circuit single-phase earth fault localization method and system
Technical field
This application involves distribution circuit single-phase earth fault field of locating technology, and in particular to a kind of distribution line is single-phase to be connect Earth fault localization method and system.
Background technique
China's medium voltage distribution network plays the role of important distribution electric energy in power network, and medium voltage distribution network is by distribution wire The composition such as road, shaft tower, distribution transformer, disconnecting switch, reactive-load compensator and some affiliated facilities, wherein distribution line is main For overhead transmission line.Since overhead transmission line is easy to happen ground fault, so that the reliability of power distribution network distribution reduces.
In a plurality of types of ground faults, singlephase earth fault is relatively conventional.In order to increase the reliable of power distribution network distribution Property, it needs in time to position the position that singlephase earth fault occurs in distribution line, wherein the position of singlephase earth fault Referred to as fault point, after obtaining fault point, relevant departments are rapidly handled singlephase earth fault, to eliminate single-phase connect Influence of the earth fault for distribution.
There are mainly two types of existing method for locating single-phase ground fault, another one is being positioned using fault current It is to be positioned using initial transient traveling wave.However, when being positioned using fault current, since singlephase earth fault occurs Transition resistance can be generated later, under the influence of transition resistance, the possible very little of fault current, it is difficult to be detected;It is utilizing When initial transient traveling wave is positioned, since the initial phase angle of singlephase earth fault is smaller, so that initial transient traveling wave is weaker, it is also difficult To be detected.It can be seen that single-phase earthing is occurring when carrying out the positioning of singlephase earth fault using both the above method In the case where failure, it is difficult to be detected since measurement to be checked is weaker, so as to cause the lower problem of positioning accuracy.
Summary of the invention
The application provides a kind of distribution circuit single-phase earth fault localization method and system, to solve existing single-phase earthing therefore Hinder in localization method, due to measurement to be checked it is weaker caused by the lower problem of positioning accuracy.
The application's, in a first aspect, providing a kind of distribution circuit single-phase earth fault localization method, the method is applied to Distribution circuit single-phase earth fault positioning system, the system comprises: detection terminal and host computer, the detection terminal pass through GSM network is communicated with the host computer, and the detection terminal is used to detect whether distribution line occurs singlephase earth fault, If singlephase earth fault occurs, the fault data of singlephase earth fault is transmitted to the host computer by the detection terminal, described Host computer is for analyzing the fault data, to determine the position of singlephase earth fault;
The described method includes:
The voltage signal of three-phase electricity on the detection terminal acquisition distribution line;
The detection terminal carries out Karenbuaer phase-model transformation to the voltage signal, obtains zero mode voltage;
The detection terminal judges whether zero mode voltage is equal to the first preset threshold;
In the case where zero mode voltage is not equal to first preset threshold, the detection terminal is electric by zero mould Pressure is transmitted to the host computer;
The host computer judges whether zero mode voltage is greater than the second preset threshold, if zero mode voltage is greater than second Preset threshold, the host computer continue to judge whether the slope of the corresponding wavefront of zero mode voltage is greater than third and presets threshold Value;
If the slope of the corresponding wavefront of zero mode voltage is greater than third predetermined threshold value, the host computer uses traveling wave Damped method calculates fault point to the distance of detection terminal;
The host computer, to the distance of detection terminal, determines the position of singlephase earth fault according to the fault point.
Optionally, the detection terminal carries out Karenbuaer phase-model transformation to the voltage signal, obtains zero mode voltage, Include:
The detection terminal carries out carrying out Karenbuaer phase-model transformation to the voltage signal according to the following formula:
Wherein, ua(t)、ub(t) and ucIt (t) is the voltage signal of three-phase electricity;u0It (t) is zero mode voltage.
Optionally, the host computer calculates fault point to the distance for detecting terminal using traveling wave damped method, comprising:
The host computer calculates α according to the following formula1、α2:
Wherein, R0、L0、G0、C0For frequency wiUnder route unit length parameter, i=1,2;αiFor γiReal part, βiFor γiImaginary part, j be plural number, w1、w2It can any two frequency of Fourier decomposition out for the corresponding wavefront of zero mode voltage Rate, α1、α2Respectively frequency w1、w2In the case where wavefront amplitude attenuation coefficient;
The host computer calculates fault point to the distance of detection terminal according to the following formula:
Wherein, x is distance of the fault point to detection terminal, and H is any two frequency w1、w2Frequency component amplitude Ratio.
Optionally, the host computer determines the position of singlephase earth fault according to the fault point to the distance of detection terminal It sets, comprising:
The host computer is according to the fault point to the distance x of the two neighboring detection terminal1And x2, will be described in Distance x1And x2Position of the intersection of determining fault point as singlephase earth fault.
The second aspect of the application provides a kind of distribution circuit single-phase earth fault positioning system, the system comprises: inspection It surveys terminal and host computer, the detection terminal is communicated by GSM network and the host computer, the detection terminal is for examining It is measured whether electric line occurs singlephase earth fault, if singlephase earth fault occurs, the detection terminal is by singlephase earth fault Fault data be transmitted to the host computer, the host computer is for analyzing the fault data, to determine singlephase earth fault Position;
The detection terminal includes:
Data acquisition module, for acquiring the voltage signal of three-phase electricity on distribution line;
Phase-model transformation module obtains zero mode voltage for carrying out Karenbuaer phase-model transformation to the voltage signal;
First judgment module, for judging whether zero mode voltage is equal to the first preset threshold;
Data transmission module, for determining zero mode voltage not equal to first preset threshold in the judgment module In the case where, zero mode voltage is transmitted to the host computer;
The host computer includes:
Second judgment module, for judging whether zero mode voltage is greater than the second preset threshold, if zero mode voltage Greater than the second preset threshold, the host computer continues to judge whether the slope of the corresponding wavefront of zero mode voltage is greater than Three preset thresholds;
Computing module, for determining that the slope of the corresponding wavefront of zero mode voltage is greater than the in the judgment module In the case where three preset thresholds, fault point is calculated to the distance for detecting terminal using traveling wave damped method;
Determining module determines the position of singlephase earth fault for the distance according to the fault point to detection terminal.
Optionally, the phase-model transformation module includes:
Phase-model transformation unit carries out the moding of Karenbuaer phase to the voltage signal for carrying out according to the following formula It changes:
Wherein, ua(t)、ub(t) and ucIt (t) is the voltage signal of three-phase electricity;u0It (t) is zero mode voltage.
Optionally, the computing module includes:
First computing unit, for calculating α according to the following formula1、α2:
Wherein, R0、L0、G0、C0For frequency wiUnder route unit length parameter, i=1,2;αiFor γiReal part, βiFor γiImaginary part, j be plural number, w1、w2It can any two frequency of Fourier decomposition out for the corresponding wavefront of zero mode voltage Rate, α1、α2Respectively frequency w1、w2In the case where wavefront amplitude attenuation coefficient;
Second computing unit, the distance for calculating fault point according to the following formula to detection terminal:
Wherein, x is distance of the fault point to detection terminal, and H is any two frequency w1、w2Frequency component amplitude Ratio.
Optionally, the determining module includes:
Determination unit, for the distance x according to the fault point to the two neighboring detection terminal1And x2, institute will be utilized State distance x1And x2Position of the intersection of determining fault point as singlephase earth fault.
From the above technical scheme, it in method provided by the present application, is positioned using zero mode voltage traveling wave attenuation characteristic single The position of phase ground fault, zero mode voltage wavefront easily identifies and precision is higher, can be quickly found out abort situation, eliminates Hidden danger, solve the problems, such as in conventional mapping methods due to it is to be checked measurement it is weaker caused by positioning accuracy it is not high.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below Singly introduce, it should be apparent that, for those of ordinary skills, without creative efforts, also Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is a kind of workflow signal of distribution circuit single-phase earth fault localization method provided by the embodiments of the present application Figure;
Fig. 2 is a kind of schematic diagram of a scenario of distribution circuit single-phase earth fault positioning system provided by the embodiments of the present application;
Fig. 3 is a kind of structural schematic diagram of distribution circuit single-phase earth fault positioning system provided by the embodiments of the present application.
Specific embodiment
To solve in existing method for locating single-phase ground fault, since positioning accuracy is lower caused by measurement to be checked is weaker The problem of, the application provides a kind of distribution circuit single-phase earth fault localization method and system.
Work flow diagram shown in referring to Fig.1, the embodiment of the present application provide a kind of distribution circuit single-phase earth fault positioning Method, the method are applied to distribution circuit single-phase earth fault positioning system, the system comprises: detection terminal and upper Machine, the detection terminal are communicated by GSM network and the host computer, and the detection terminal is for detecting distribution line No generation singlephase earth fault, if singlephase earth fault occurs, the detection terminal passes the fault data of singlephase earth fault The host computer is transported to, the host computer is for analyzing the fault data, to determine the position of singlephase earth fault;
It the described method comprises the following steps:
Step 101, the detection terminal acquires the voltage signal of three-phase electricity on distribution line.
Step 102, the detection terminal carries out Karenbuaer phase-model transformation to the voltage signal, obtains zero mould electricity Pressure.
In the step, the detection terminal carries out carrying out Karenbuaer phase mould to the voltage signal according to the following formula Transformation:
Wherein, ua(t)、ub(t) and ucIt (t) is the voltage signal of three-phase electricity;u0It (t) is zero mode voltage.
Step 103, the detection terminal judges whether zero mode voltage is equal to the first preset threshold.
In the step, the value of the first preset threshold is usually zero, if zero mode voltage is zero, determines that electric system is normal, Ground fault is not present, then detects the operation that terminal returns to step 101;If zero mode voltage is not zero, power train is determined There are ground faults for system, continue to execute the operation of step 104.
Step 104, in the case where zero mode voltage is not equal to first preset threshold, the detection terminal is by institute It states zero mode voltage and is transmitted to the host computer.
The operation of step 101 to step 103 is executed by the integrated circuit board that data collecting card and DSP are core, at DSP Data after reason are uploaded to host computer by GSM network, continue data analysis by host computer.
Step 105, the host computer judges whether zero mode voltage is greater than the second preset threshold, if zero mode voltage Greater than the second preset threshold, the host computer continues to judge whether the slope of the corresponding wavefront of zero mode voltage is greater than Three preset thresholds.
In the step, the size of the second preset threshold and third predetermined threshold value is determined by route itself, and zero mode voltage is bigger, Illustrate that deviation normal level is more, route is bigger a possibility that there are ground faults.Identification wavefront is actually to identify The slope of traveling wave, wavefront is bigger, and route is bigger a possibility that there are earth faults, if the slope of wavefront is greater than the Three preset thresholds then follow the steps 106 operation, otherwise it is assumed that ground fault is not present, return to step 101 operation.
Step 106, if the slope of the corresponding wavefront of zero mode voltage is greater than third predetermined threshold value, the host computer Fault point is calculated to the distance for detecting terminal using traveling wave damped method.
In the step, the host computer calculates fault point to the distance for detecting terminal using traveling wave damped method, comprising:
The host computer calculates α according to the following formula1、α2:
Wherein, R0、L0、G0、C0For frequency wiUnder route unit length parameter, i=1,2;αiFor γiReal part, βiFor γiImaginary part, j be plural number, w1、w2It can any two frequency of Fourier decomposition out for the corresponding wavefront of zero mode voltage Rate, α1、α2Respectively frequency w1、w2In the case where wavefront amplitude attenuation coefficient;
The host computer calculates fault point to the distance of detection terminal according to the following formula:
Wherein, x is distance of the fault point to detection terminal, and H is any two frequency w1、w2Frequency component amplitude Ratio.
Step 107, the host computer determines the position of singlephase earth fault according to the fault point to the distance of detection terminal It sets.
In the step, the host computer is according to the fault point to the distance x of the two neighboring detection terminal1And x2, will Utilize the distance x1And x2Position of the intersection of determining fault point as singlephase earth fault.
For example, if detection terminal A and detection terminal B are detected simultaneously by fault point, wherein detection terminal A arrives fault point Distance is x1, it is assumed that distance x at left and right sides of detection terminal1The point at place is respectively possible breakdown point A1And A2;Another detection terminal B Distance to fault point is x2, then distance x at left and right sides of terminal is detected2The point at place is respectively possible breakdown point B1And B2;At this point, If possible breakdown point A2With possible breakdown point B1There are intersections, then by A2Or B1Position as singlephase earth fault.
From the above technical scheme, it in method provided by the present application, is positioned using zero mode voltage traveling wave attenuation characteristic single The position of phase ground fault, zero mode voltage wavefront easily identifies and precision is higher, can be quickly found out abort situation, eliminates Hidden danger, solve the problems, such as in conventional mapping methods due to it is to be checked measurement it is weaker caused by positioning accuracy it is not high.
Referring to schematic diagram of a scenario shown in Fig. 2, concrete scene is described below: single-phase earthing event provided by the present application Hindering positioning system includes detection terminal 1 and host computer 2, and the detection terminal 1 includes capacitive divider 11, data acquisition module 12, data analysis module 13 and data transmission module 14.The capacitive divider 11 is the insulator of higfh-tension ceramics capacitance core, is used Voltage signal on detection distribution line, capacitance core are sealed in interior insulator, capacitor can be prevented due to rainwater filth etc. Short circuit.The data acquisition module be used for collection voltages signal, the data analysis module 13 be used for the voltage signal into Row Karenbuaer phase-model transformation, obtains zero mode voltage, and judges whether zero mode voltage is equal to the first preset threshold.Data Transmission module 14 is used to be transmitted to zero mode voltage described in the case where zero mode voltage is equal to the first preset threshold Host computer 2.
Referring to structural schematic diagram shown in Fig. 3, the embodiment of the present application provides a kind of distribution circuit single-phase earth fault positioning System, the system comprises: detection terminal and host computer, the detection terminal are led to by GSM network and the host computer News, the detection terminal is for detecting whether distribution line occurs singlephase earth fault, if singlephase earth fault, the inspection occurs It surveys terminal and the fault data of singlephase earth fault is transmitted to the host computer, the host computer is for analyzing the number of faults According to determine the position of singlephase earth fault;
The detection terminal includes:
Data acquisition module 100, for acquiring the voltage signal of three-phase electricity on distribution line;
Phase-model transformation module 200 obtains zero mould electricity for carrying out Karenbuaer phase-model transformation to the voltage signal Pressure;
First judgment module 300, for judging whether zero mode voltage is equal to the first preset threshold;
Data transmission module 400, for determining that zero mode voltage is default not equal to described first in the judgment module In the case where threshold value, zero mode voltage is transmitted to the host computer;
The host computer includes:
Second judgment module 500, for judging whether zero mode voltage is greater than the second preset threshold, if zero mould is electric Pressure is greater than the second preset threshold, and the host computer continues to judge whether the slope of the corresponding wavefront of zero mode voltage is greater than Third predetermined threshold value;
Computing module 600, for determining that the slope of the corresponding wavefront of zero mode voltage is big in the judgment module In the case where third predetermined threshold value, fault point is calculated to the distance for detecting terminal using traveling wave damped method;
Determining module 700 determines the position of singlephase earth fault for the distance according to the fault point to detection terminal It sets.
Optionally, the phase-model transformation module includes:
Phase-model transformation unit carries out the moding of Karenbuaer phase to the voltage signal for carrying out according to the following formula It changes:
Wherein, ua(t)、ub(t) and ucIt (t) is the voltage signal of three-phase electricity;u0It (t) is zero mode voltage.
Optionally, the computing module includes:
First computing unit, for calculating α according to the following formula1、α2:
Wherein, R0、L0、G0、C0For frequency wiUnder route unit length parameter, i=1,2;αiFor γiReal part, βiFor γiImaginary part, j be plural number, w1、w2It can any two frequency of Fourier decomposition out for the corresponding wavefront of zero mode voltage Rate, α1、α2Respectively frequency w1、w2In the case where wavefront amplitude attenuation coefficient;
Second computing unit, the distance for calculating fault point according to the following formula to detection terminal:
Wherein, x is distance of the fault point to detection terminal, and H is any two frequency w1、w2Frequency component amplitude Ratio.
Optionally, the determining module includes:
Determination unit, for the distance x according to the fault point to the two neighboring detection terminal1And x2, institute will be utilized State distance x1And x2Position of the intersection of determining fault point as singlephase earth fault.
It is required that those skilled in the art can be understood that the technology in the embodiment of the present invention can add by software The mode of general hardware platform realize.Based on this understanding, the technical solution in the embodiment of the present invention substantially or Say that the part that contributes to existing technology can be embodied in the form of software products, which can deposit Storage is in storage medium, such as ROM/RAM, magnetic disk, CD, including some instructions are used so that computer equipment (can be with It is personal computer, server or the network equipment etc.) execute certain part institutes of each embodiment of the present invention or embodiment The method stated.
Same and similar part may refer to each other between each embodiment in this specification.Implement especially for device For example, since it is substantially similar to the method embodiment, so being described relatively simple, related place is referring in embodiment of the method Explanation.
Combine detailed description and exemplary example that the application is described in detail above, but these explanations are simultaneously It should not be understood as the limitation to the application.It will be appreciated by those skilled in the art that without departing from the application spirit and scope, A variety of equivalent substitution, modification or improvements can be carried out to technical scheme and embodiments thereof, these each fall within the application In the range of.The protection scope of the application is determined by the appended claims.

Claims (8)

1. a kind of distribution circuit single-phase earth fault localization method, which is characterized in that it is single-phase that the method is applied to distribution line Earth design system, the system comprises detection terminal and host computer, the detection terminal pass through GSM network with it is described Host computer is communicated, and the detection terminal is for detecting whether distribution line occurs singlephase earth fault, if single-phase connect occurs The fault data of singlephase earth fault is transmitted to the host computer by earth fault, the detection terminal, and the host computer is for dividing The fault data is analysed, to determine the position of singlephase earth fault;
The described method includes:
The voltage signal of three-phase electricity on the detection terminal acquisition distribution line;
The detection terminal carries out Karenbuaer phase-model transformation to the voltage signal, obtains zero mode voltage;
The detection terminal judges whether zero mode voltage is equal to the first preset threshold;
In the case where zero mode voltage is not equal to first preset threshold, the detection terminal passes zero mode voltage Transport to the host computer;
The host computer judges whether zero mode voltage is greater than the second preset threshold, presets if zero mode voltage is greater than second Threshold value, the host computer continue to judge whether the slope of the corresponding wavefront of zero mode voltage is greater than third predetermined threshold value;
If the slope of the corresponding wavefront of zero mode voltage is greater than third predetermined threshold value, the host computer is using traveling wave decaying Method calculates fault point to the distance of detection terminal;
The host computer, to the distance of detection terminal, determines the position of singlephase earth fault according to the fault point.
2. the method according to claim 1, wherein the detection terminal carries out the voltage signal Karenbuaer phase-model transformation obtains zero mode voltage, comprising:
The detection terminal carries out carrying out Karenbuaer phase-model transformation to the voltage signal according to the following formula:
Wherein, ua(t)、ub(t) and ucIt (t) is the voltage signal of three-phase electricity;u0It (t) is zero mode voltage.
3. being arrived the method according to claim 1, wherein the host computer calculates fault point using traveling wave damped method Detect the distance of terminal, comprising:
The host computer calculates α according to the following formula1、α2:
Wherein, R0、L0、G0、C0For frequency wiUnder route unit length parameter, i=1,2;αiFor γiReal part, βiFor γi's Imaginary part, j are plural number, w1、w2For the corresponding wavefront of zero mode voltage can Fourier decomposition go out any two frequency, α1、 α2Respectively frequency w1、w2In the case where wavefront amplitude attenuation coefficient;
The host computer calculates fault point to the distance of detection terminal according to the following formula:
Wherein, x is distance of the fault point to detection terminal, and H is any two frequency w1、w2Frequency component amplitude ratio Value.
4. the method according to claim 1, wherein the host computer is according to the fault point to detection terminal Distance determines the position of singlephase earth fault, comprising:
The host computer is according to the fault point to the distance x of the two neighboring detection terminal1And x2, the distance will be utilized x1And x2Position of the intersection of determining fault point as singlephase earth fault.
5. a kind of distribution circuit single-phase earth fault positioning system, which is characterized in that the system comprises: detection terminal and upper Machine, the detection terminal are communicated by GSM network and the host computer, and the detection terminal is for detecting distribution line No generation singlephase earth fault, if singlephase earth fault occurs, the detection terminal passes the fault data of singlephase earth fault The host computer is transported to, the host computer is for analyzing the fault data, to determine the position of singlephase earth fault;
The detection terminal includes:
Data acquisition module, for acquiring the voltage signal of three-phase electricity on distribution line;
Phase-model transformation module obtains zero mode voltage for carrying out Karenbuaer phase-model transformation to the voltage signal;
First judgment module, for judging whether zero mode voltage is equal to the first preset threshold;
Data transmission module, for determining that zero mode voltage is not equal to the feelings of first preset threshold in the judgment module Under condition, zero mode voltage is transmitted to the host computer;
The host computer includes:
Second judgment module, for judging whether zero mode voltage is greater than the second preset threshold, if zero mode voltage is greater than Second preset threshold, the host computer continue to judge whether the slope of the corresponding wavefront of zero mode voltage is greater than third pre- If threshold value;
Computing module, for determining that it is pre- that the slope of the corresponding wavefront of zero mode voltage is greater than third in the judgment module If in the case where threshold value, calculating fault point to the distance for detecting terminal using traveling wave damped method;
Determining module determines the position of singlephase earth fault for the distance according to the fault point to detection terminal.
6. system according to claim 5, which is characterized in that the phase-model transformation module includes:
Phase-model transformation unit carries out Karenbuaer phase-model transformation to the voltage signal for carrying out according to the following formula:
Wherein, ua(t)、ub(t) and ucIt (t) is the voltage signal of three-phase electricity;u0It (t) is zero mode voltage.
7. system according to claim 5, which is characterized in that the computing module includes:
First computing unit, for calculating α according to the following formula1、α2:
Wherein, R0、L0、G0、C0For frequency wiUnder route unit length parameter, i=1,2;αiFor γiReal part, βiFor γi's Imaginary part, j are plural number, w1、w2For the corresponding wavefront of zero mode voltage can Fourier decomposition go out any two frequency, α1、 α2Respectively frequency w1、w2In the case where wavefront amplitude attenuation coefficient;
Second computing unit, the distance for calculating fault point according to the following formula to detection terminal:
Wherein, x is distance of the fault point to detection terminal, and H is any two frequency w1、w2Frequency component amplitude ratio Value.
8. system according to claim 5, which is characterized in that the determining module includes:
Determination unit, for the distance x according to the fault point to the two neighboring detection terminal1And x2, will using it is described away from From x1And x2Position of the intersection of determining fault point as singlephase earth fault.
CN201811573622.8A 2018-12-21 2018-12-21 A kind of distribution circuit single-phase earth fault localization method and system Pending CN109387733A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109901014A (en) * 2019-03-08 2019-06-18 西安交通大学 The voltage waveform acquisition method and its monitoring system of power grid ground fault

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101232176A (en) * 2008-01-09 2008-07-30 潍坊学院 Non-effective earthing distribution system fault locating method based on neutral point of transient traveling wave
CN101776725A (en) * 2010-01-13 2010-07-14 上海交通大学 Fault positioning method for transmission line
CN106546873A (en) * 2016-09-28 2017-03-29 深圳市惠立智能电力科技有限公司 A kind of distribution singlephase earth fault Section Location and system
CN106646121A (en) * 2016-11-29 2017-05-10 国网辽宁省电力有限公司沈阳供电公司 Power distribution network fault traveling-wave range identification method
CN108365599A (en) * 2018-01-23 2018-08-03 西安交通大学 Half-wave power transmission line one-end amount traveling-wave protection method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101232176A (en) * 2008-01-09 2008-07-30 潍坊学院 Non-effective earthing distribution system fault locating method based on neutral point of transient traveling wave
CN101776725A (en) * 2010-01-13 2010-07-14 上海交通大学 Fault positioning method for transmission line
CN106546873A (en) * 2016-09-28 2017-03-29 深圳市惠立智能电力科技有限公司 A kind of distribution singlephase earth fault Section Location and system
CN106646121A (en) * 2016-11-29 2017-05-10 国网辽宁省电力有限公司沈阳供电公司 Power distribution network fault traveling-wave range identification method
CN108365599A (en) * 2018-01-23 2018-08-03 西安交通大学 Half-wave power transmission line one-end amount traveling-wave protection method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
徐铭铭 等: "基于零模行波衰减特性的配电线路单相接地故障测距方法", 《电工技术学报》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109901014A (en) * 2019-03-08 2019-06-18 西安交通大学 The voltage waveform acquisition method and its monitoring system of power grid ground fault

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