CN108957244A - A kind of distribution main website single-phase earth fault line selection localization method - Google Patents
A kind of distribution main website single-phase earth fault line selection localization method Download PDFInfo
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- CN108957244A CN108957244A CN201811007942.7A CN201811007942A CN108957244A CN 108957244 A CN108957244 A CN 108957244A CN 201811007942 A CN201811007942 A CN 201811007942A CN 108957244 A CN108957244 A CN 108957244A
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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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Abstract
The invention discloses a kind of distribution main website single-phase earth fault line selection localization methods.After distribution main website receives therefore refers to remote signalling, first start false alarm prevention criterion, line selection and location program then is started to true fault.Line selection and location method is first to synthesize zero-sequence current, is mutated then in conjunction with the variation of three-phase electric field virtual value and zero-sequence current and determines failure starting point, then obtains transient zero-sequence current after failure by bandpass filter.By each route according to the descending sequence of transient zero-sequence current virtual value of respective beginning fault detector, then the related coefficient by calculating route beginning equipment room transient zero-sequence current two-by-two obtains failure line selection as a result, finally determining abort situation in faulty line.It wrong report when the present invention can filter out non-faulting and is influenced by neutral grounding mode and singlephase earth fault mode, line selection and location effect is reliably accurate.
Description
Technical field
The present invention relates to a kind of distribution main website single-phase earth fault line selection localization methods, especially a kind of to be based on transient state recording
The distribution main website single-phase earth fault line selection localization method of type fault detector.
Background technique
China's power distribution network is widely used the neutral non-effective grounding method of operation, mainly isolated neutral or through extinguishing arc
Coil ground connection.When singlephase earth fault occurs, since line voltage is still kept symmetrically, generally allow to continue to run 1-2h, but
Failure propagation caused by being increased in order to prevent because of phase voltage, it should fast line selection and positioning failure.
The problems of failure line selection positioning at present is: (1) there are regular universal for transient state recording type fault detector
Property wrong report situation need to increase the examination to reporting fault to guarantee effective monitoring to distribution operating condition；(2) due to depositing
In sampling error, and fault signature may be unobvious, can not timely and accurately line selection and location.
Summary of the invention
The invention proposes a kind of distribution main website single-phase earth fault line selection localization method, technical problems to be solved
It is: (1) avoids wrong report situation；(2) timely and accurately route selection and positioning failure.
Technical scheme is as follows:
A kind of distribution main website single-phase earth fault line selection localization method, includes the following steps:
Step 1: after singlephase earth fault occurs for distribution network overhead line, fault detector starts recording, and completes in recording
Remote signalling displacement is sent to distribution main website afterwards；After main website receives the remote signalling, closed according to fault detector is corresponding with line facility
The switch state of system and distribution at this time, calculates topological relation, wrong report is judged whether it is according to topological relation, if not wrong report
Then enter step two；
Step 2: main website calls the recorded wave file of this failure to the fault detector of starting recording；According to real-time topology
Relationship finds in each route near the fault detector of the bus i.e. recorded wave file of beginning fault detector, parses A, B, C
Three-phase electric field and three-phase current, and synthesize zero-sequence current；
Step 3: trouble-shooting starting point: half week of each route beginning fault detector A, B, C three-phase electric field is first calculated
Then wave virtual value determines failure start periods according to the variation of the virtual value, then according to zero-sequence current when failure originates
The mutation of section determines failure starting point；
Step 4: the data of a cycle where each route beginning fault detector zero-sequence current failure starting point are made
The steady-state component in initial data is filtered, is obtained by the bandpass filter of a linear phase for the initial data comprising transient state
Transient zero-sequence current after to failure；
Step 5: the virtual value of transient zero-sequence current after each route beginning fault detector failure is calculated separately, by transient state
The descending sequence of zero-sequence current virtual value；Using the maximum route of transient zero-sequence current virtual value as reference line, successively count
Calculate the related coefficient of transient zero-sequence current between other routes and reference line；With faulty line and all non-fault line polarity phases
Instead i.e. related coefficient is less than 0 while the intermediate polarity identical related coefficient of non-fault line is greater than 0 for principle, obtains failure line selection knot
Fruit；
Step 6: it to the faulty line selected, since the route beginning fault detector, successively calculates per adjacent two
The transient zero-sequence current normalizated correlation coefficient of a equipment；With the transient zero-sequence current height phase between neighbouring device before fault point
Close and fault point before and after equipment room transient zero-sequence current lower correlation be principle determine abort situation；The transient state zero of the equipment
Sequence current calculation method is the same as step 2 to four.
As a further improvement of the present invention: judging whether the method for wrong report in the step 1 are as follows:
If the half of a bus institute connecting lines is 3 or more and the fault detector of institute's connecting lines more than half starts
Recording is not then wrong report；
If the half of a bus institute connecting lines has 3 or more fault detectors to open less than 3 and in institute's connecting lines
Dynamic recording is not then wrong report.
As a further improvement of the present invention: trouble-shooting starting point in the step 3 method particularly includes:
(3-1) calculates separately the virtual value of A, B, C three-phase half of cycle of electric field, if UAk-1、UAkAnd UAk+1Respectively indicate A
Phase electric field kth -1, k and k+1 half cycles virtual value calculate Sudden Changing Rate UAk+1-UAk-1If the Sudden Changing Rate is more than default threshold
Value, then k, k+1 are failure start periods；
(3-2) if A, B, C three-phase electric field half cycles virtual value Sudden Changing Rate UAk+1-UAk-1、UBk+1-UBk-1、UCk+1-UCk-1
Above threshold value then determines kth and k+1 half cycles for the cycle where failure starting point；
(3-3) calculates the amplitude maximum of zero-sequence current in the kth of zero-sequence current and the cycle of k+1 half cycle wave component
Value, the corresponding sampled point of the maximum value are failure starting point.
As a further improvement of the present invention: the bandpass filter in the step 4 is FIR filter.
As a further improvement of the present invention: the calculation formula of related coefficient in step 5 are as follows:
X (n) and y (n) is respectively n-th of sampling point value for participating in the transient zero-sequence current of the two route beginning equipment calculated, n in formula
For sampled point serial number.
As a further improvement of the present invention: the calculation formula of normalizated correlation coefficient in step 6 are as follows:X (n) and y (n) is respectively the transient zero-sequence for participating in two equipment calculated in formula
N-th of sampling point value of electric current, n are sampled point serial number.
Compared with the existing technology, the present invention has following good effect: (1) distribution main website is receiving fault detector starting
After the remote signalling of recording, to whether being that wrong report is judged, fault detector wrong report phenomenon outstanding at present is avoided, the reality of mistake is sentenced
Now using the existing device model of distribution main website and topological computing module, without in addition design, small investment is conducive to maintenance；(2)
Change the method trouble-shooting starting point combined with current break using electric field virtual value, each physical quantity can be made full use of
Fault signature, and can effectively avoid single signal sampling error big and fault signature is unobvious has an impact to result；(3) pass through
The bandpass filter of one linear phase is accurately obtained transient zero-sequence current after failure, has both guaranteed that signal is undistorted, has in turn ensured
The reliability of subsequent algorithm；(4) big, opposite in phase the spy using faulty line and non-fault line transient state capacity current difference in magnitude
Point first tentatively selects faulty line with virtual value sequence, then verifies error correction by calculating related coefficient；(5) failure is finally utilized
Point front and back transient zero-sequence current difference in magnitude is big, opposite polarity feature, determines abort situation with normalizated correlation coefficient.
To sum up, the distribution main website singlephase earth fault choosing based on transient state recording type fault detector that the invention proposes a kind of
Line localization method, it is when this method can filter out non-faulting thus refer to wrong report and after the failure occurred timely and accurately route selection and
Positioning, and do not influenced by neutral grounding mode and singlephase earth fault mode, line selection and location effect is reliably accurate.
Specific embodiment
The following detailed description of technical solution of the present invention:
A kind of distribution main website single-phase earth fault line selection localization method is specifically a kind of based on the event of transient state recording type
Hinder the distribution main website single-phase earth fault line selection localization method of indicator.
Currently, electric distribution network overhead wire is generally mounted with transient state recording type fault detector.After singlephase earth fault occurs,
The change triggers three-phase acquisition unit of phase voltage completes transient fault recorder, and aggregation units upload recorder data to distribution main website.
High coverage rate of the fault detector in power distribution network, in addition the data storage and processing ability that distribution main website is powerful, so that extracting
Transient state component in fault detector recording signal realizes single-phase earth fault line selection and positioning, has stronger practicability.
Specific step is as follows for this method:
Step 1: after singlephase earth fault occurs for distribution network overhead line, fault detector starts recording, and completes in recording
Remote signalling displacement is sent to distribution main website afterwards；After main website receives the remote signalling, closed according to fault detector is corresponding with line facility
The switch state of system and distribution at this time, calculates topological relation, wrong report is judged whether it is according to topological relation, if not wrong report
Two are then entered step, is otherwise terminated；
Judge whether the method for wrong report are as follows:
If the half of a bus institute connecting lines is 3 or more and the fault detector of institute's connecting lines more than half starts
Recording is not then wrong report；
If the half of a bus institute connecting lines has 3 or more fault detectors to open less than 3 and in institute's connecting lines
Dynamic recording is not then wrong report.
The recorder data that fault detector uploads to distribution main website includes 8 after 4 cycles before no less than failure and failure
A, B, C three-phase electric field and three-phase current of cycle.
Step 2: main website calls the recorded wave file of this failure to the fault detector of starting recording；According to real-time topology
Relationship finds in each route near the fault detector of the bus i.e. recorded wave file of beginning fault detector, parses A, B, C
Three-phase electric field and three-phase current, and synthesize zero-sequence current.
Step 3: trouble-shooting starting point: half week of each route beginning fault detector A, B, C three-phase electric field is first calculated
Wave (referring to fundamental wave cycle, similarly hereinafter) virtual value, then determines failure start periods according to the variation of the virtual value, then according to zero sequence
Electric current determines failure starting point in the mutation of failure start periods；
Trouble-shooting starting point method particularly includes:
(3-1) calculates separately the virtual value of A, B, C three-phase half of cycle of electric field, if UAk-1、UAkAnd UAk+1Respectively indicate A
Phase electric field kth -1, k and k+1 half cycles virtual value calculate Sudden Changing Rate UAk+1-UAk-1If the Sudden Changing Rate is more than default threshold
Value, then k, k+1 are failure start periods；
(3-2) if A, B, C three-phase electric field half cycles virtual value Sudden Changing Rate UAk+1-UAk-1、UBk+1-UBk-1、UCk+1-UCk-1
Above threshold value then determines kth and k+1 half cycles for the cycle where failure starting point；
(3-3) calculates the amplitude maximum of zero-sequence current in the kth of zero-sequence current and the cycle of k+1 half cycle wave component
Value, the corresponding sampled point of the maximum value are failure starting point.
When due to singlephase earth fault, zero sequence stable state electrical quantity amplitude is smaller, utilizes the failure line selection of zero sequence steady-state component
Method accuracy rate is low.And transient current is several to more than ten times bigger than steady-state current, based on transient signal come route selection, accuracy rate it is higher and
It will not be influenced by arc suppression coil.
Step 4: the data of a cycle where each route beginning fault detector zero-sequence current failure starting point are made
The steady-state component in initial data is filtered, is obtained by the bandpass filter of a linear phase for the initial data comprising transient state
Transient zero-sequence current after to failure；Specifically:
(4-1) comprehensively considers the frequency range of distribution network overhead line single-phase earth fault transient electric current mentioned above
The sample frequency 4096Hz of (300-1500Hz) and fault detector designs the band logical FIR filter an of linear phase,
Guarantee that filtered signal is undistorted；
(4-2) using the data of a cycle nearly before and after zero-sequence current failure starting point as input signal, by (4-1)
The filter of design, obtains transient zero-sequence current.
The singlephase earth fault because caused by insulation is breakdown frequently occurs near the peak value of phase voltage, at this time failure zero
Transient state capacitance current component in sequence electric current is larger.Transient state capacitance current free oscillation frequency (basic frequency) and distribution network line are long
The correlations such as degree, structure, ground resistance, grounding point, i.e. basic frequency are not fixed.For distribution network overhead line, the freedom of transient current
For frequency of oscillation generally within the scope of 300-1500Hz, route is longer, and frequency is lower.Transient state recording type fault detector is adopted at present
Sample frequency is usually 4096Hz, due to being to sampling of sinusoidal signal, so sampling maximum effective frequency is 4096/3=1365Hz.
A, B, C three-phase sample-synchronous error are in 100 μ s.Sample frequency is lower, high-frequency signal resolving power is poor, alternate synchronous error is adopted greatly
In the lower situation of sample precision, judged using virtual value, it is more suitable compared to instantaneous value is used.
Step 5: the virtual value of transient zero-sequence current after each route beginning fault detector failure is calculated separately, by transient state
The descending sequence of zero-sequence current virtual value；Using the maximum route of transient zero-sequence current virtual value as reference line, successively count
Calculate the related coefficient of transient zero-sequence current between other routes and reference line；With faulty line and all non-fault line polarity phases
Instead i.e. related coefficient is less than 0 while the intermediate polarity identical related coefficient of non-fault line is greater than 0 for principle, obtains failure line selection knot
Fruit；
The calculation formula of related coefficient are as follows:X (n) and y (n) is respectively to participate in meter in formula
N-th of sampling point value of the transient zero-sequence current for the two route beginning equipment calculated, n are sampled point serial number.
Step 6: it to the faulty line selected, since the route beginning fault detector, successively calculates per adjacent two
The transient zero-sequence current normalizated correlation coefficient of a equipment；With the transient zero-sequence current height phase between neighbouring device before fault point
Close and fault point before and after equipment room transient zero-sequence current lower correlation be principle determine abort situation；The transient state zero of the equipment
Sequence current calculation method is the same as step 2 to four；
The calculation formula of normalizated correlation coefficient are as follows:X (n) and y (n) in formula
N-th of sampling point value of the transient zero-sequence current of two equipment calculated is respectively participated in, n is sampled point serial number.
It is one embodiment of the present invention above, the principle of the present invention has been described in more detail, it is all according to skill of the present invention
Change made by art scheme, all belongs to the scope of protection of the present invention.The scope of protection of the patent of the present invention should be with appended claims
Subject to.
Claims (6)
1. a kind of distribution main website single-phase earth fault line selection localization method, it is characterised in that include the following steps:
Step 1: distribution network overhead line occur singlephase earth fault after, fault detector start recording, and recording completion after to
Distribution main website sends remote signalling displacement；After main website receives the remote signalling, according to the corresponding relationship of fault detector and line facility with
And the switch state of distribution at this time, calculate topological relation, wrong report is judged whether it is according to topological relation, if not report by mistake then into
Enter step 2；
Step 2: main website calls the recorded wave file of this failure to the fault detector of starting recording；According to real-time topology relationship,
It finds in each route near the fault detector of the bus i.e. recorded wave file of beginning fault detector, parses A, B, C three-phase
Electric field and three-phase current, and synthesize zero-sequence current；
Step 3: trouble-shooting starting point: half of cycle for first calculating each route beginning fault detector A, B, C three-phase electric field has
Then valid value determines failure start periods according to the variation of the virtual value, then according to zero-sequence current in failure start periods
It is mutated and determines failure starting point；
Step 4: using the data of a cycle where each route beginning fault detector zero-sequence current failure starting point as packet
Initial data containing transient state filters the steady-state component in initial data by the bandpass filter of a linear phase, obtains event
Transient zero-sequence current after barrier；
Step 5: the virtual value of transient zero-sequence current after each route beginning fault detector failure is calculated separately, by transient zero-sequence
The descending sequence of current effective value；Using the maximum route of transient zero-sequence current virtual value as reference line, it is successively calculated
The related coefficient of transient zero-sequence current between its route and reference line；It is so that faulty line is opposite with all non-fault line polarity
Related coefficient is less than 0 while the intermediate polarity identical related coefficient of non-fault line is greater than 0 for principle, obtains failure line selection result；
Step 6: it to the faulty line selected, since the route beginning fault detector, successively calculates and is set per adjacent two
Standby transient zero-sequence current normalizated correlation coefficient；With the transient zero-sequence current between neighbouring device before fault point it is highly relevant and
The transient zero-sequence current lower correlation of equipment room is that principle determines abort situation before and after fault point；The transient zero-sequence electricity of the equipment
Flow calculation methodologies are the same as step 2 to four.
2. distribution main website single-phase earth fault line selection localization method as described in claim 1, it is characterised in that the step 1
In judge whether wrong report method are as follows:
If the half of a bus institute connecting lines is 3 or more and the starting of the fault detector of institute's connecting lines more than half is recorded
Wave is not then wrong report；
If the half of a bus institute connecting lines has 3 or more fault detector starting records less than 3 and in institute's connecting lines
Wave is not then wrong report.
3. distribution main website single-phase earth fault line selection localization method as described in claim 1, it is characterised in that the step 3
Middle trouble-shooting starting point method particularly includes:
(3-1) calculates separately the virtual value of A, B, C three-phase half of cycle of electric field, if UAk-1、UAkAnd UAk+1Respectively indicate A phase electric field
Kth -1, k and k+1 half cycles virtual value calculate Sudden Changing Rate UAk+1‐UAk-1If the Sudden Changing Rate is more than preset threshold, k, k
+ 1 is failure start periods；
(3-2) if A, B, C three-phase electric field half cycles virtual value Sudden Changing Rate UAk+1‐UAk-1、UBk+1‐UBk-1、UCk+1‐UCk-1It is all super
Threshold value is crossed, then determines kth and k+1 half cycles for the cycle where failure starting point；
(3-3) calculates the amplitude maximum of zero-sequence current in the kth of zero-sequence current and the cycle of k+1 half cycle wave component, should
The corresponding sampled point of maximum value is failure starting point.
4. distribution main website single-phase earth fault line selection localization method as described in claim 1, it is characterised in that: the step 4
In bandpass filter be FIR filter.
5. distribution main website single-phase earth fault line selection localization method as described in claim 1, it is characterised in that phase in step 5
The calculation formula of relationship number are as follows:X (n) and y (n) is respectively two lines for participating in calculating in formula
N-th of sampling point value of the transient zero-sequence current of road beginning equipment, n are sampled point serial number.
6. distribution main website single-phase earth fault line selection localization method as claimed in claim 1 to 5, it is characterised in that step
The calculation formula of normalizated correlation coefficient in six are as follows: X (n) and y (n) difference in formula
For n-th of sampling point value of the transient zero-sequence current of two equipment of participation calculating, n is sampled point serial number.
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| CN110687400A (en) * | 2019-10-16 | 2020-01-14 | 东方电子股份有限公司 | Method for filtering false start of transient recording type fault indicator |
| CN110907752A (en) * | 2019-11-29 | 2020-03-24 | 科大智能电气技术有限公司 | Method for acquiring transient initial point of zero-sequence current in single-phase earth fault of power distribution network |
| CN111289838A (en) * | 2020-02-13 | 2020-06-16 | 国电南瑞科技股份有限公司 | Single-phase earth fault positioning method and system based on distribution network PMU |
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| CN112526282A (en) * | 2020-06-15 | 2021-03-19 | 国网湖北省电力有限公司黄冈供电公司 | Distribution network single-phase earth fault section positioning method |
| CN112240966A (en) * | 2020-08-06 | 2021-01-19 | 许继集团有限公司 | Fault current grounding judgment method |
| CN112083270A (en) * | 2020-08-14 | 2020-12-15 | 昆明理工大学 | Wind power plant current collection line single-phase earth fault line selection method based on correlation coefficient |
| CN112180217A (en) * | 2020-09-30 | 2021-01-05 | 福州大学 | Power distribution network single-phase earth fault section positioning method and system |
| CN112986859A (en) * | 2021-02-25 | 2021-06-18 | 国网江苏省电力有限公司无锡供电分公司 | Power distribution network intermittent earth fault protection method based on multi-interval information |
| CN112986859B (en) * | 2021-02-25 | 2022-11-11 | 国网江苏省电力有限公司无锡供电分公司 | Power distribution network intermittent earth fault protection method based on multi-interval information |
| CN113671308A (en) * | 2021-07-06 | 2021-11-19 | 国网上海能源互联网研究院有限公司 | Abnormal data screening method and system for digital acquisition device of power distribution switch |
| CN113671308B (en) * | 2021-07-06 | 2024-05-28 | 国网上海能源互联网研究院有限公司 | Abnormal data screening method and system of digital acquisition device of power distribution switch |
| CN114002555A (en) * | 2021-09-27 | 2022-02-01 | 国网新疆电力公司哈密供电公司 | Edge calculation method based on distributed fault recording unit |
| CN114002555B (en) * | 2021-09-27 | 2024-04-19 | 国网新疆电力公司哈密供电公司 | Edge calculation method based on distributed fault wave recording unit |
| CN113884816A (en) * | 2021-10-25 | 2022-01-04 | 北京东土科技股份有限公司 | Single-phase earth fault section positioning method, device, equipment and storage medium |
| CN115389860A (en) * | 2022-05-16 | 2022-11-25 | 国网四川省电力公司电力科学研究院 | Power distribution network single-phase high-resistance grounding line selection strategy based on current composite criterion |
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