CN105334430B - A kind of single-phase ground fault distance measuring method and system based on electrical power distribution automatization system - Google Patents

A kind of single-phase ground fault distance measuring method and system based on electrical power distribution automatization system Download PDF

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CN105334430B
CN105334430B CN201510873303.9A CN201510873303A CN105334430B CN 105334430 B CN105334430 B CN 105334430B CN 201510873303 A CN201510873303 A CN 201510873303A CN 105334430 B CN105334430 B CN 105334430B
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zero
sequence current
distribution line
distribution
voltage
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CN105334430A (en
Inventor
黄飞
张捷
范昭勇
刘志宏
张友强
钟加勇
罗建
熊伟
魏甦
刘思绪
欧睿
陈曦
魏燕
赵志伟
欧林
胡晓锐
向菲
宫林
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Chongqing University
Electric Power Research Institute of State Grid Chongqing Electric Power Co Ltd
State Grid Corp of China SGCC
State Grid Chongqing Electric Power Co Ltd
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Chongqing University
Electric Power Research Institute of State Grid Chongqing Electric Power Co Ltd
State Grid Corp of China SGCC
State Grid Chongqing Electric Power Co Ltd
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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
    • G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
    • 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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Locating Faults (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The invention discloses the residual voltage and zero-sequence current of a kind of single-phase ground fault distance measuring method based on electrical power distribution automatization system, first collection distribution line both ends；Calculating state is judged according to the residual voltage at distribution line both ends and zero-sequence current, when detecting the zero-sequence current voltage at distribution line both ends；When detecting that there is three-phase current voltage in distribution line one end, when the other end has zero-sequence current；When detecting that there is three-phase current voltage in distribution line one end, when the other end is without detection Current Voltage, the trouble point of distribution line is calculated according to circuit distributed constant circuit model；The present invention provides the applicable elements of power distribution network application with regard to Single-phase Ground Connection Failure localization method；Three kinds of situation fault localizations are the seizure of single-phase earthing moment residual voltage and zero-sequence current；Utilize the single-phase ground fault distance measuring principle based on circuit distributed constant circuit model, it is only necessary in basic routing line node and important branch node installing distribution terminal collection circuit residual voltage, zero-sequence current.

Description

A kind of single-phase ground fault distance measuring method and system based on electrical power distribution automatization system
Technical field
The present invention relates to distribution network line field, particularly a kind of singlephase earth fault based on electrical power distribution automatization system is surveyed Away from method.
Background technology
At present, most of fault location device applied to distribution line is the single end distance measurement dress based on resistance algorithm principle Put.This distance measuring method is had a great influence by transition resistance in principle under two-side feeding mode, thus to ensure it is good and Stable range accuracy will be very difficult.
Range accuracy has extremely important meaning in distribution network line fault ranging, it directly influences line fault Lookup and the length for time of fixing a breakdown.Range accuracy height can shorten emergency repair time, and fast recovery of power supply, reduces economic damage Lose.
Therefore, it is necessary to a kind of method of the trouble point calculated under different faults type condition.
The content of the invention
It is an object of the invention to provide a kind of method of the trouble point calculated under different faults type condition.
Realized the purpose of the present invention is technical solution in this way：
A kind of single-phase ground fault distance measuring method based on electrical power distribution automatization system provided by the invention, including following step Suddenly：
S1：Gather the residual voltage and zero-sequence current at distribution line both ends；
S2：Calculating state is judged according to the residual voltage at distribution line both ends and zero-sequence current, when the state of calculating meets During following condition, and line fault search is carried out by following corresponding mode：
S21：When detecting the zero-sequence current voltage at distribution line both ends, calculated according to circuit distributed constant circuit model The residual voltage v of circuit one endFMWith the residual voltage v of the other endFN, and search and residual voltage v on distribution lineFMAnd vFN Consistent point is the trouble point of distribution line；
S22：When detecting that there is three-phase current voltage in distribution line one end, when the other end has zero-sequence current,
Obtain the detection residual voltage v of trouble point FF0With detection zero-sequence current iNF0；
According to the detection residual voltage v of distribution line distributed constant circuit model trouble point F pointsF0With detection zero-sequence current iNF0The zero-sequence current for calculating distribution line one end obtains calculating zero-sequence current iN0,
Zero-sequence current i will be calculatedN0With detection zero-sequence current iNF0It is compared, if calculating zero-sequence current iN0With detection zero Sequence electric current iNF0Identical, then trouble point F is earth fault；
Continue search for calculating if it is not the same, returning；
S23：When detecting that there is three-phase current voltage in distribution line one end, when the other end is without detection Current Voltage,
Calculate trouble point F point forward-order currents iNF1With forward-order current iNF2；
Calculate transition resistance ZFOn zero-sequence current iF0, forward-order current iF1With negative-sequence current iF2；
Judge transition resistance zero-sequence current iF0, forward-order current iF1With negative-sequence current iF2It is whether equal, should if equal Point is trouble point；
If unequal, return re-starts；
S3：Store and export trouble point.
Further, it is further comprising the steps of：
As the faulted phase voltage v of trouble point FFDuring equal to zero, then faulted phase voltage vFNull point is trouble point.
Further, it is further comprising the steps of：
By obtaining faulted phase voltage vFWith ground connection transition resistance ZFOn the transition resistance zero-sequence current i that flows throughF0Calculating connects Ground transition resistance ZF, compare ground connection transition resistance ZFChange, obtain the property of singlephase earth fault.
Further, the detection zero-sequence current iNF0Through the following steps that to calculate：
The instantaneous phase principle of method is represented according to instantaneous signal SIN function, using the sine based on Hilbert transform Function representation method, obtains faulted phase voltage vF(t) zero-sequence current flowed into M endsSIN function represents：
In formula,Represent, ψvF(t) represent,Represent,Represent, ω takes power frequency angular frequency；By iNF0 Carry out SIN function expression：
In formula,Respectively polynomial function；Due to iF0=iMF0+iNF0, and vFInstantaneous phase with iF0Instantaneous phase is identical, has：
According to above formula, using in a periodψvF(t)、Value, using least square Method can be asked forThe coefficient of polynomial function；
According to definitePolynomial function calculates detection zero-sequence current iNF0。
Further, the residual voltage at the distribution line both ends and zero-sequence current collection are by being arranged at distribution line two The acquisition terminal at end obtains；The acquisition terminal is arranged in distribution line trunk distribution line and default syvfeeder Road.
The present invention provides a kind of single-phase ground fault distance measuring system based on electrical power distribution automatization system, including distribution are automatic Change main website, communication system and distribution power automation terminal；
The distribution power automation terminal, which is arranged at, is used for the electrical parameter for gathering distribution line both ends, the electricity on distribution line Parameter includes residual voltage and zero-sequence current；
Distribution main website is the upper system of distribution automation system, completes the monitoring to the various online equipments of distribution network systems And control, and the failure that circuit occurs is handled；
The distribution line electrical parameter that distribution terminal gathers is uploaded to power distribution automation main station by the communication system；And receive The control command that power distribution automation main station passes down；
The power distribution automation main station, which receives the electrical parameter information that distribution power automation terminal uploads and is distributed according to circuit, joins Number circuit model calculates trouble point distance on distribution line.
Further, the calculating of the trouble point distance is carried out according to following steps：
S1：Obtain the residual voltage and zero-sequence current at distribution line both ends；
S2：Calculating state is judged according to the residual voltage at distribution line both ends and zero-sequence current, when the state of calculating meets During following condition, and line fault search is carried out by following corresponding mode：
S21：When detecting the zero-sequence current voltage at distribution line both ends, calculated according to circuit distributed constant circuit model The residual voltage v of circuit one endFMWith the residual voltage v of the other endFN, and search and residual voltage v on distribution lineFMAnd vFN Consistent point is the trouble point of distribution line；
S22：When detecting that there is three-phase current voltage in distribution line one end, when the other end has zero-sequence current,
Obtain the detection residual voltage v of trouble point FF0With detection zero-sequence current iNF0；
According to the detection residual voltage v of distribution line distributed constant circuit model trouble point F pointsF0With detection zero-sequence current iNF0The zero-sequence current for calculating distribution line one end obtains calculating zero-sequence current iN0,
Zero-sequence current i will be calculatedN0With detection zero-sequence current iNF0It is compared, if calculating zero-sequence current iN0With detection zero Sequence electric current iNF0Identical, then trouble point F is earth fault；
Continue search for calculating if it is not the same, returning；
S23：When detecting that there is three-phase current voltage in distribution line one end, when the other end is without detection Current Voltage,
Calculate trouble point F point forward-order currents iNF1With forward-order current iNF2；
Calculate transition resistance ZFOn zero-sequence current iF0, forward-order current iF1With negative-sequence current iF2；
Judge transition resistance zero-sequence current iF0, forward-order current iF1With negative-sequence current iF2It is whether equal, should if equal Point is trouble point；
If unequal, return re-starts；
S3：Store and export trouble point.
Further, it is further comprising the steps of：
As the faulted phase voltage v of trouble point FFDuring equal to zero, then faulted phase voltage vFNull point is trouble point；
By obtaining faulted phase voltage vFWith ground connection transition resistance ZFOn the transition resistance zero-sequence current i that flows throughF0Calculating connects Ground transition resistance ZF, compare ground connection transition resistance ZFChange, obtain the property of singlephase earth fault；
Residual voltage and the zero-sequence current collection at the distribution line both ends are by being arranged at adopting for distribution line both ends Collect terminal to obtain；The acquisition terminal is arranged in distribution line trunk distribution line and default branch distribution circuit.
Further, the detection zero-sequence current iNF0Through the following steps that to calculate：
The instantaneous phase principle of method is represented according to instantaneous signal SIN function, using the sine based on Hilbert transform Function representation method, obtains faulted phase voltage vF(t) zero-sequence current flowed into M endsSIN function represents：
In formula,Represent, ψvF(t) represent,Represent,Represent, ω takes power frequency angular frequency；By iNF0 Carry out SIN function expression：
In formula,Respectively polynomial function；Due to iF0=iMF0+iNF0, and vFInstantaneous phase with iF0Instantaneous phase is identical, has：
According to above formula, using in a periodψvF(t)、Value, using least square Method can be asked forThe coefficient of polynomial function；
According to definitePolynomial function calculates detection zero-sequence current iNF0。
By adopting the above-described technical solution, the present invention has the advantage that：
The present invention is removed using the theoretical foundation of the single-phase ground fault distance measuring method based on circuit distributed constant circuit model Outside circuit distributed constant circuit model, the SIN function for also having instantaneous signal represents method.To different electric network compositions, different ground connection The adaptability of various singlephase earth faults under the conditions of mode and Different climate；To transition resistance (being not less than 2000 Europe), just Single-phase Ground Connection Failure localization method provides the applicable elements of power distribution network application；Three kinds of situation fault localizations are single-phase earthing moments The scene interference of the voltage and current signal of seizure, the collection of residual voltage and zero-sequence current removes, the school of current transformer polarity Just, second and third kind of situation be instantaneous signal SIN function represent ask for, the order components electric current of trouble point offside circuit is asked Take, the synchronization process for also having two test point gathered datas of the second situation.
And Current Distribution Automation terminal can not achieve adopting for the fault characteristic information such as single-phase earthing under different earthed systems Collection and transmission, cause electrical power distribution automatization system still to solve singlephase earth fault orientation problem well.
Utilize the single-phase ground fault distance measuring principle based on circuit distributed constant circuit model, it is only necessary in basic routing line node With important branch node installing distribution terminal collection circuit residual voltage, zero-sequence current.
Other advantages, target and the feature of the present invention will be illustrated in the following description to a certain extent, and And to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, Huo Zheke To be instructed from the practice of the present invention.The target and other advantages of the present invention can be wanted by following specification and right Book is sought to realize and obtain.
Brief description of the drawings
The brief description of the drawings of the present invention is as follows.
Fig. 1 is the single-phase ground fault distance measuring method schematic diagram based on electrical power distribution automatization system of the present invention.
Fig. 2 is the zero-sequence network schematic diagram of the line single phase grounding failure of the present invention.
Embodiment
The invention will be further described with reference to the accompanying drawings and examples.
Embodiment 1
As shown in the figure, a kind of single-phase ground fault distance measuring method based on electrical power distribution automatization system provided in this embodiment, It is characterized in that：Comprise the following steps：
S1：Gather the residual voltage and zero-sequence current at distribution line both ends；
S2：Calculating state is judged according to the residual voltage at distribution line both ends and zero-sequence current, when the state of calculating meets During following condition, and line fault search is carried out by following corresponding mode：
S21：When detecting the zero-sequence current voltage at distribution line both ends, calculated according to circuit distributed constant circuit model The residual voltage v of circuit one endFMWith the residual voltage v of the other endFN, and search and residual voltage v on distribution lineFMAnd vFN Consistent point is the trouble point of distribution line；
S22：When detecting that there is three-phase current voltage in distribution line one end, when the other end has zero-sequence current,
Obtain the detection residual voltage v of trouble point FF0With detection zero-sequence current iNF0；
According to the detection residual voltage v of distribution line distributed constant circuit model trouble point F pointsF0With detection zero-sequence current iNF0The zero-sequence current for calculating distribution line one end obtains calculating zero-sequence current iN0,
Zero-sequence current i will be calculatedN0With detection zero-sequence current iNF0It is compared, if calculating zero-sequence current iN0With detection zero Sequence electric current iNF0Identical, then trouble point F is earth fault；
Continue search for calculating if it is not the same, returning；
S23：When detecting that there is three-phase current voltage in distribution line one end, when the other end is without detection Current Voltage,
Calculate trouble point F point forward-order currents iNF1With forward-order current iNF2；
Calculate transition resistance ZFOn zero-sequence current iF0, forward-order current iF1With negative-sequence current iF2；
Judge transition resistance zero-sequence current iF0, forward-order current iF1With negative-sequence current iF2It is whether equal, should if equal Point is trouble point；
If unequal, return re-starts；
S3：Store and export trouble point.
It is further comprising the steps of：
As the faulted phase voltage v of trouble point FFDuring equal to zero, then faulted phase voltage vFNull point is trouble point.
It is further comprising the steps of：
By obtaining faulted phase voltage vFWith ground connection transition resistance ZFOn the transition resistance zero-sequence current i that flows throughF0Calculating connects Ground transition resistance ZF, compare ground connection transition resistance ZFChange, obtain the property of singlephase earth fault.
The detection zero-sequence current iNF0Through the following steps that to calculate：
The instantaneous phase principle of method is represented according to instantaneous signal SIN function, using the sine based on Hilbert transform Function representation method, obtains faulted phase voltage vF(t) zero-sequence current flowed into M endsSIN function represents：
In formula,Represent, ψvF(t) represent,Represent,Represent, ω takes power frequency angular frequency；By iNF0 Carry out SIN function expression：
In formula,Respectively polynomial function；Due to iF0=iMF0+iNF0, and vFInstantaneous phase with iF0Instantaneous phase is identical, has：
According to above formula, using in a periodψvF(t)、Value, using least square Method can be asked forThe coefficient of polynomial function；
According to definitePolynomial function calculates detection zero-sequence current iNF0。
Residual voltage and the zero-sequence current collection at the distribution line both ends are by being arranged at adopting for distribution line both ends Collect terminal to obtain；The acquisition terminal is arranged in distribution line trunk distribution line and default branch distribution circuit.
A kind of single-phase ground fault distance measuring system based on electrical power distribution automatization system provided in this embodiment, including distribution is certainly Dong Hua main websites, communication system and distribution power automation terminal；
The distribution power automation terminal, which is arranged at, is used for the electrical parameter for gathering distribution line both ends, the electricity on distribution line Parameter includes residual voltage and zero-sequence current；
Distribution main website is the upper system of distribution automation system, completes the monitoring to the various online equipments of distribution network systems And control, and the failure that circuit occurs is handled；
The distribution line electrical parameter that distribution terminal gathers is uploaded to power distribution automation main station by the communication system；And receive The control command that power distribution automation main station passes down；
The power distribution automation main station, which receives the electrical parameter information that distribution power automation terminal uploads and is distributed according to circuit, joins Number circuit model calculates trouble point distance on distribution line.
The calculating of the trouble point distance is carried out according to following steps：
S1：Obtain the residual voltage and zero-sequence current at distribution line both ends；
S2：Calculating state is judged according to the residual voltage at distribution line both ends and zero-sequence current, when the state of calculating meets During following condition, and line fault search is carried out by following corresponding mode：
S21：When detecting the zero-sequence current voltage at distribution line both ends, calculated according to circuit distributed constant circuit model The residual voltage v of circuit one endFMWith the residual voltage v of the other endFN, and search and residual voltage v on distribution lineFMAnd vFN Consistent point is the trouble point of distribution line；
S22：When detecting that there is three-phase current voltage in distribution line one end, when the other end has zero-sequence current,
Obtain the detection residual voltage v of trouble point FH0With detection zero-sequence current iNF0；
According to the detection residual voltage v of distribution line distributed constant circuit model trouble point F pointsF0With detection zero-sequence current iNF0The zero-sequence current for calculating distribution line one end obtains calculating zero-sequence current iN0,
Zero-sequence current i will be calculatedN0With detection zero-sequence current iNF0It is compared, if calculating zero-sequence current iN0With detection zero Sequence electric current iNF0Identical, then trouble point F is earth fault；
Continue search for calculating if it is not the same, returning；
S23：When detecting that there is three-phase current voltage in distribution line one end, when the other end is without detection Current Voltage,
Calculate trouble point F point forward-order currents iNF1With forward-order current iNF2；
Calculate transition resistance ZFOn zero-sequence current iF0, forward-order current iF1With negative-sequence current iF2；
Judge transition resistance zero-sequence current iF0, forward-order current iF1With negative-sequence current iF2It is whether equal, should if equal Point is trouble point；
If unequal, return re-starts；
S3：Store and export trouble point.
It is further comprising the steps of：
As the faulted phase voltage v of trouble point FFDuring equal to zero, then faulted phase voltage vFNull point is trouble point；
By obtaining faulted phase voltage vFWith ground connection transition resistance ZFOn the transition resistance zero-sequence current i that flows throughF0Calculating connects Ground transition resistance ZF, compare ground connection transition resistance ZFChange, obtain the property of singlephase earth fault；
Residual voltage and the zero-sequence current collection at the distribution line both ends are by being arranged at adopting for distribution line both ends Collect terminal to obtain；The acquisition terminal is arranged in distribution line trunk distribution line and default branch distribution circuit.
The detection zero-sequence current iNF0Through the following steps that to calculate：
The instantaneous phase principle of method is represented according to instantaneous signal SIN function, using the sine based on Hilbert transform Function representation method, obtains faulted phase voltage vF(t) zero-sequence current flowed into M endsSIN function represents：
In formula,Represent, ψvF(t) represent,Represent,Represent, ω takes power frequency angular frequency；By iNF0 Carry out SIN function expression：
In formula,Respectively polynomial function；Due to iF0=iMF0+iNF0, and vFInstantaneous phase with iF0Instantaneous phase is identical, has：
According to above formula, using in a periodψvF(t)、Value, using least square Method can be asked forThe coefficient of polynomial function；
According to definitePolynomial function calculates detection zero-sequence current iNF0。
Embodiment 2
As shown in the figure, a kind of single-phase ground fault distance measuring method based on electrical power distribution automatization system provided in this embodiment, Comprise the following steps：
S1：Gather the residual voltage and zero-sequence current at distribution line both ends；
S2：The residual voltage and zero-sequence current detection state for judging distribution line both ends meet which kind of following condition, and press In the following manner carries out line fault search：
S21：When detecting the zero-sequence current voltage at distribution line both ends, calculated according to circuit distributed constant circuit model The residual voltage v of circuit any pointFMAnd vFN, and search and residual voltage v on distribution lineFMAnd vFNConsistent point is The trouble point of distribution line；
S22：When detecting that there is three-phase current voltage in distribution line one end, when the other end has zero-sequence current,
Obtain the detection residual voltage v of trouble point FF0With detection zero-sequence current iNF0；
According to the detection residual voltage v of distribution line distributed constant circuit model trouble point F pointsF0With detection zero-sequence current iNF0The zero-sequence current for calculating distribution line one end obtains calculating zero-sequence current iN0,
Zero-sequence current i will be calculatedN0With detection zero-sequence current iNF0It is compared, if calculating zero-sequence current iN0With detection zero Sequence electric current iNF0Identical, then trouble point F is earth fault；
If it is not the same, return to step continues search for calculating.
S23：When detecting that there is three-phase current voltage in distribution line one end, when the other end is without detection Current Voltage,
Calculate trouble point F point forward-order currents iNF1With forward-order current iNF2；
Calculate transition resistance ZFOn zero-sequence current iF0, forward-order current iF1With negative-sequence current iF2；
Judge transition resistance zero-sequence current iF0, forward-order current iF1With negative-sequence current iF2It is whether equal, should if equal Point is trouble point；
If unequal, return re-starts；
S3：Store and export trouble point.
It is further comprising the steps of：
As the faulted phase voltage v of trouble point FFDuring equal to zero, then faulted phase voltage vFNull point is trouble point.
It is further comprising the steps of：
By obtaining faulted phase voltage vFWith ground connection transition resistance ZFOn the transition resistance zero-sequence current i that flows throughF0Calculating connects Ground transition resistance ZF, compare ground connection transition resistance ZFChange, obtain the property of singlephase earth fault.
The detection zero-sequence current iNF0Through the following steps that to calculate：
The instantaneous phase principle of method is represented according to instantaneous signal SIN function, using the sine based on Hilbert transform Function representation method, obtains faulted phase voltage vFThe zero-sequence current i flowed into M endsMF0SIN function represents：
In formula,Represent, ψvF(t) represent,Represent,Represent, ω takes power frequency angular frequency；By iNF0Into Row SIN function represents, has
In formula,Respectively polynomial function；Due to iF0=iMF0+iNF0, and vFInstantaneous phase with iF0Instantaneous phase is identical, has：
According to above formula, using in a periodψvF(t)、Value, using least square Method can be asked forThe coefficient of polynomial function；
DeterminePolynomial function, therewith iNF0It can ask for.
Residual voltage and the zero-sequence current collection at the distribution line both ends are by being arranged at adopting for distribution line both ends Collect terminal to obtain；The acquisition terminal is arranged in distribution line trunk distribution line and default branch distribution circuit.
Embodiment 3
Single-phase ground fault distance measuring method provided in this embodiment based on electrical power distribution automatization system, wherein, based on circuit The single-phase ground fault distance measuring principle of distributed constant circuit model is as follows：
After line fault section is determined by singlephase earth fault Section Location, based on circuit distributed constant circuit The single-phase ground fault distance measuring principle of model is divided into three kinds of situations and is described, and is that circuit both ends zero-sequence current voltage can be examined respectively Survey situation, circuit one end three-phase current voltage can detect the other end and only detects zero-sequence current situation, circuit one end three-phase electricity galvanic electricity The all undetectable situation of the detectable other end Current Voltage of pressure.
1) circuit both ends zero-sequence current voltage can detect situation
Referring to Fig. 2, from circuit both ends M and N, to set a distance x and, line is calculated according to circuit distributed constant circuit model The residual voltage v of road any pointFMAnd vFN, searching of line finds residual voltage vFMAnd vFNConsistent point is exactly trouble point.
2) circuit one end three-phase current voltage can detect the other end and only detect zero-sequence current situation
Fig. 2 is the zero-sequence network schematic diagram of line single phase grounding failure, in fig. 2, the distance between circuit both ends M and N For, the distance between test point M and trouble point F are x, ZFTransition resistance is grounded for trouble point.Line single phase grounding failure is just Sequence and negative sequence network also can same way expressions.
Set a distance x is given, the residual voltage according to circuit distributed constant circuit model by M ends residual voltage Current calculation F points vF0The zero-sequence current i flowed into M endsMF0, can similarly rectify the positive sequence voltage v of sequence and negative sequence voltage Current calculation F points by MF1With Negative sequence voltage vF2, obtain the faulted phase voltage v of F pointsF, since there are trouble point ground connection transition resistance ZFFor the characteristic of purely resistive, Faulted phase voltage vFPhase and ground connection transition resistance ZFOn the earth current i that flows throughF0Same-phase.Transition resistance zero-sequence current iF0Phase The zero-sequence current i that position is flowed into M endsMF0Phase is identical, transition resistance ZFIt is stable resistance, can be searched according to the two conditions Rope Single-phase Ground Connection Failure.But under actual conditions, iF0Phase and iMF0Phase is possible to inconsistent, or even larger difference occurs Away from ZFMay not also be stable resistance, this just needs to obtain the detection zero-sequence current i that N-terminal flows intoNF0, in order to obtain iNF0, draw Enter the instantaneous phase principle that instantaneous signal SIN function represents method, it is believed that at any one time, the v of trouble pointFInstantaneous phase with vF0Instantaneous phase is identical, with ZFThe resistance whether stablized is unrelated.Using the SIN function expression side based on Hilbert transform Method, can obtain vFAnd iMF0SIN function expression, i.e.,：
In formula, Φ (t) vF、Ψ(t)vF、Φ(t)iMF0、Ψ(t)iMF0Uniquely and it is known that ω takes power frequency angular frequency.By iNF0 SIN function expression is carried out, is had
In formula, Φ (t)iMF0、Ψ(t)iMF0It can be represented respectively with a polynomial function.Due to iF0=iMF0+iNF0, and vFWink Shi Xiangwei and iF0Instantaneous phase is identical, has：
According to above formula, Φ (t) v in a period are utilizedF、Ψ(t)vF、Φ(t)iMF0、Ψ(t)iMF0Value, using most Small square law can ask for Φ (t)iMF0、Ψ(t)iMF0The coefficient of polynomial function, that is, can determine that Φ (t)iMF0、Ψ(t)iMF0 Polynomial function, therewith iNF0It can ask for.
In the residual voltage v of F pointsF0With zero-sequence current iNF0In the case of having asked for, according to circuit distributed constant circuit model By F points vF0And iNF0The zero-sequence current for calculating N-terminal obtains calculating zero-sequence current iN0, zero-sequence current i will be calculatedN0With detection zero sequence electricity Flow iNF0Compare, the two is consistent, then F points are earth faults；If inconsistent, continue search for calculating.
In earth fault point search process, if above trouble point condition does not meet to occur as soon as faulted phase voltage vFEqual to zero Situation, faulted phase voltage v at this timeFNull point is exactly trouble point.
3) circuit one end three-phase current voltage can detect all undetectable situation of other end Current Voltage
Referring to the zero-sequence current i of Fig. 2, at this time N-terminalN0It can not survey.According to F points detection zero-sequence current iNF0Acquiring method, just Positive sequence and negative sequence network, calculate F point forward-order currents iNF1With forward-order current iNF2, thus transition resistance ZFOn transition resistance zero sequence Electric current iF0, forward-order current iF1With negative-sequence current iF2It can ask for, iF0、iF1、iF2Equal point is exactly trouble point, according to this ranging Condition just can search for earth fault.
Obtaining faulted phase voltage vFWith ground connection transition resistance ZFOn the transition resistance zero-sequence current i that flows throughF0, it was grounded Cross resistance ZFIt can obtain, whereby ZFChange, the property of singlephase earth fault can be analyzed.
The theoretical foundation of single-phase ground fault distance measuring method based on circuit distributed constant circuit model is except circuit distribution ginseng Outside number circuit model, the SIN function for also having instantaneous signal represents method.Research to the effect that to different electric network compositions, no The adaptation Journal of Sex Research of various singlephase earth faults under the conditions of same earthing mode and Different climate, (be not less than transition resistance 2000 Europe) adaptation Journal of Sex Research, with regard to Single-phase Ground Connection Failure localization method provide power distribution network application applicable elements；Three kinds of situations The Major Difficulties common ground of Research on fault locating is the seizure of single-phase earthing moment residual voltage and zero-sequence current, the electricity of collection The scene interference of current voltage signal removes, the correction of current transformer polarity, and the Research Challenges of second and third kind of situation are instantaneously to believe What number SIN function represented ask for, the order components electric current of trouble point offside circuit is asked for, and the Research Challenges of the second situation are also There is the synchronization process of two test point gathered datas.
2nd, electrical power distribution automatization system and terminal are layouted
The overall structure of electrical power distribution automatization system includes：Power distribution automation main station, communication system and distribution power automation terminal. Distribution main website is the upper system of distribution automation system, completes the monitoring and control to the various online equipments of distribution network systems, And the failure that circuit occurs is handled；Communication system is the platform and tie that main website is interacted with distribution terminal system information, It is the nerve of whole electrical power distribution automatization system；Distribution power automation terminal is to being acquired circuit electrical quantity by sensor, locating Reason and upload, and controller switching equipment is monitored.And Current Distribution Automation terminal can not achieve it is single-phase under different earthed systems The collection and transmission of the fault characteristic informations such as ground connection, cause electrical power distribution automatization system still cannot singlephase earth fault orientation problem Solve well.
Utilize the single-phase ground fault distance measuring principle based on circuit distributed constant circuit model, it is only necessary in basic routing line node With important branch node installing distribution terminal collection circuit residual voltage, zero-sequence current.
Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, although with reference to compared with The present invention is described in detail in good embodiment, it will be understood by those of ordinary skill in the art that, can be to the skill of the present invention Art scheme technical scheme is modified or replaced equivalently, without departing from the objective and scope of the technical program, it should all cover in the present invention Right among.

Claims (9)

  1. A kind of 1. single-phase ground fault distance measuring method based on electrical power distribution automatization system, it is characterised in that：Comprise the following steps：
    S1：Gather the residual voltage and zero-sequence current at distribution line both ends；
    S2：Calculating state is judged according to the residual voltage at distribution line both ends and zero-sequence current, when calculating state meet it is following During condition, and line fault search is carried out by following corresponding mode：
    S21：When detecting the zero-sequence current voltage at distribution line both ends, circuit is calculated according to circuit distributed constant circuit model The residual voltage v of one endFMWith the residual voltage v of the other endFN, and search and residual voltage v on distribution lineFMAnd vFNXiang Yi The point of cause is the trouble point of distribution line；
    S22：When detecting that there is three-phase current voltage in distribution line one end, when the other end has zero-sequence current,
    Obtain the detection residual voltage of trouble point FWith detection zero-sequence current
    According to the detection residual voltage of distribution line distributed constant circuit model trouble point F pointsWith detection zero-sequence currentMeter The zero-sequence current for calculating distribution line one end obtains calculating zero-sequence current
    Zero-sequence current will be calculatedWith detection zero-sequence currentIt is compared, if calculating zero-sequence currentWith detection zero sequence electricity StreamIdentical, then trouble point F is earth fault；
    Continue search for calculating if it is not the same, returning；
    S23：When detecting that there is three-phase current voltage in distribution line one end, when the other end is without detection Current Voltage,
    Calculate trouble point F point forward-order currentsAnd forward-order current
    Calculate transition resistance ZFOn zero-sequence currentForward-order currentAnd negative-sequence current
    Judge transition resistance zero-sequence currentForward-order currentAnd negative-sequence currentWhether equal, if equal, which is Trouble point；
    If unequal, return re-starts；
    S3：Store and export trouble point.
  2. 2. the single-phase ground fault distance measuring method based on electrical power distribution automatization system as claimed in claim 1, it is characterised in that：Also Comprise the following steps：
    When the faulted phase voltage of trouble point FDuring equal to zero, then faulted phase voltageNull point is trouble point.
  3. 3. the single-phase ground fault distance measuring method based on electrical power distribution automatization system as claimed in claim 1, it is characterised in that：Also Comprise the following steps：
    By obtaining faulted phase voltageWith ground connection transition resistance ZFOn the transition resistance zero-sequence current that flows throughCalculating was grounded Cross resistance ZF, compare ground connection transition resistance ZFChange, obtain the property of singlephase earth fault.
  4. 4. the single-phase ground fault distance measuring method based on electrical power distribution automatization system as claimed in claim 1, it is characterised in that：Institute State detection zero-sequence current iNF0Through the following steps that to calculate：
    The instantaneous phase principle of method is represented according to instantaneous signal SIN function, using the SIN function based on Hilbert transform Method for expressing, obtains faulted phase voltage vF(t) zero-sequence current flowed into M endsSIN function represents：
    In formula,Represent, ψvF(t) represent,Represent,Represent, ω takes power frequency angular frequency；WillCarry out just String function representation：
    In formula,Respectively polynomial function；Due toAndInstantaneous phase withWink Shi Xiangwei is identical, has：
    According to above formula, using in a periodψvF(t)、Value, can using least square method Ask forThe coefficient of polynomial function；
    According to definitePolynomial function calculates detection zero-sequence current
  5. 5. the single-phase ground fault distance measuring method based on electrical power distribution automatization system as claimed in claim 1, it is characterised in that：Institute The residual voltage and zero-sequence current collection for stating distribution line both ends are obtained by being arranged at the acquisition terminal at distribution line both ends Take；The acquisition terminal is arranged in distribution line trunk distribution line and default branch distribution circuit.
  6. A kind of 6. single-phase ground fault distance measuring system based on electrical power distribution automatization system, it is characterised in that：Including power distribution automation Main website, communication system and distribution power automation terminal；
    The distribution power automation terminal, which is arranged at, is used for the electrical parameter for gathering distribution line both ends, the electrical parameter on distribution line Including residual voltage and zero-sequence current；
    Distribution main website is the upper system of distribution automation system, completes monitoring and control to the various online equipments of distribution network systems System, and the failure that circuit occurs is handled；
    The distribution line electrical parameter that distribution terminal gathers is uploaded to power distribution automation main station by the communication system；And receive distribution The control command that automation main website passes down；
    The power distribution automation main station receives the electrical parameter information that distribution power automation terminal uploads and according to circuit distributed constant electricity Road model calculates trouble point distance on distribution line.
  7. 7. the single-phase ground fault distance measuring system based on electrical power distribution automatization system as claimed in claim 6, it is characterised in that：Institute The calculating for stating trouble point distance is carried out according to following steps：
    S1：Obtain the residual voltage and zero-sequence current at distribution line both ends；
    S2：Calculating state is judged according to the residual voltage at distribution line both ends and zero-sequence current, when calculating state meet it is following During condition, and line fault search is carried out by following corresponding mode：
    S21：When detecting the zero-sequence current voltage at distribution line both ends, circuit is calculated according to circuit distributed constant circuit model The residual voltage v of one endFMWith the residual voltage v of the other endFN, and search and residual voltage v on distribution lineFMAnd vFNXiang Yi The point of cause is the trouble point of distribution line；
    S22：When detecting that there is three-phase current voltage in distribution line one end, when the other end has zero-sequence current,
    Obtain the detection residual voltage of trouble point FWith detection zero-sequence current
    According to the detection residual voltage of distribution line distributed constant circuit model trouble point F pointsWith detection zero-sequence currentMeter The zero-sequence current for calculating distribution line one end obtains calculating zero-sequence current
    Zero-sequence current will be calculatedWith detection zero-sequence currentIt is compared, if calculating zero-sequence currentWith detection zero sequence electricity StreamIdentical, then trouble point F is earth fault；
    Continue search for calculating if it is not the same, returning；
    S23：When detecting that there is three-phase current voltage in distribution line one end, when the other end is without detection Current Voltage,
    Calculate trouble point F point forward-order currentsAnd forward-order current
    Calculate transition resistance ZFOn zero-sequence currentForward-order currentAnd negative-sequence current
    Judge transition resistance zero-sequence currentForward-order currentAnd negative-sequence currentWhether equal, if equal, which is event Barrier point；
    If unequal, return re-starts；
    S3：Store and export trouble point.
  8. 8. the single-phase ground fault distance measuring system based on electrical power distribution automatization system as claimed in claim 6, it is characterised in that：Also Comprise the following steps：
    When the faulted phase voltage of trouble point FDuring equal to zero, then faulted phase voltageNull point is trouble point；
    By obtaining faulted phase voltageWith ground connection transition resistance ZFOn the transition resistance zero-sequence current that flows throughCalculating was grounded Cross resistance ZF, compare ground connection transition resistance ZFChange, obtain the property of singlephase earth fault；
    Residual voltage and the zero-sequence current collection at the distribution line both ends are whole by being arranged at the collection at distribution line both ends Hold to obtain；The acquisition terminal is arranged in distribution line trunk distribution line and default branch distribution circuit.
  9. 9. the single-phase ground fault distance measuring system based on electrical power distribution automatization system as claimed in claim 6, it is characterised in that：Institute State detection zero-sequence current iNF0Through the following steps that to calculate：
    The instantaneous phase principle of method is represented according to instantaneous signal SIN function, using the SIN function based on Hilbert transform Method for expressing, obtains faulted phase voltage vF(t) zero-sequence current flowed into M endsSIN function represents：
    In formula,Represent, ψvF(t) represent,Represent,Represent, ω takes power frequency angular frequency；WillCarry out just String function representation：
    In formula,Respectively polynomial function；Due toAndInstantaneous phase withWink Shi Xiangwei is identical, has：
    According to above formula, using in a periodψvF(t)、Value, can using least square method Ask forThe coefficient of polynomial function；
    According to definitePolynomial function calculates detection zero-sequence current
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CN107230970A (en) * 2016-03-24 2017-10-03 中国电力科学研究院 A kind of singlephase earth fault processing method of the feeder automation of type on the spot
CN106066444A (en) * 2016-06-14 2016-11-02 北京鼎科远图科技有限公司 Ground fault detection device and method based on capacitance partial pressure and big data analysis
CN108535597B (en) * 2018-04-13 2020-08-14 国网福建省电力有限公司 Line model-based single-phase earth fault section positioning method
CN111948568B (en) * 2019-04-30 2023-04-07 国家电网有限公司 Power grid line fault processing method based on instantaneous phase consistency
CN112698147B (en) * 2020-12-03 2024-02-06 国网重庆市电力公司市区供电分公司 Power line fault point positioning method based on instantaneous phase consistency
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