CN105242174B - Based on impedance mapping function amplitude characteristic line single phase grounding failure distance measuring method - Google Patents
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Abstract
The invention discloses one kind being based on impedance mapping function amplitude characteristic line single phase grounding failure distance measuring method.The method of the present invention measures line protection installation place faulted phase voltage, faulted phase current, failure phase negative-sequence current and zero-sequence current first; calculate boundary impedance; using the comprehensive impedance at every bit in linear search method successively computing electric power line; and then the impedance mapping function value on computing electric power line at every bit successively, it is fault distance then to choose impedance mapping function value on transmission line of electricity to reach minimum distance of the point away from line protection installation place.The method of the present invention reaches this minimum characteristic using the impedance mapping function value at transmission line one-phase earth fault point and realizes the single-ended precision ranging of transmission line one-phase earth fault, the influence of transition resistance and load current and power system operation mode is eliminated in principle, and there is very high range accuracy.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System fields, concretely relate to a kind of based on impedance mapping function
Amplitude characteristic line single phase grounding failure distance measuring method.
Background technology
One-end fault ranging method carries out fault location merely with transmission line of electricity one end electrical quantity, same without communication and data
Equipment is walked, operating cost is low and algorithmic stability, and extensive use is obtained in transmission line of electricity.One-end fault ranging method is broadly divided into
Traveling wave method and impedance method.Traveling wave method carries out one-end fault ranging using the transmission property of fault transient travelling wave, and precision is high, is not transported
The influences such as line mode, excessive resistance, but it is very high to sample rate requirement, need special wave recording device, application cost high.Impedance method
Fault loop impedance is calculated using voltage, the magnitude of current after failure, is carried out according to the line length characteristic directly proportional to impedance single
Fault localization is held, simple and reliable, but fault localization precision is influenced seriously by factors such as transition resistance and load currents, especially mistake
Cross resistance it is larger when, impedance method distance measurement result can substantial deviation true fault distance in addition failure ranging failure or failure
Distance measurement result exceeds total track length, can not provide accurate fault location information, causes failure line walking difficult, is unfavorable for power transmission line
Road quick elimination of fault and the fast quick-recovery of line powering.
Invention content
It is special based on impedance mapping function amplitude that it is an object of the present invention to overcome the deficiencies of the prior art, and to provide one kind
Property line single phase grounding failure distance measuring method.This method is modeled using lumped parameter, and algorithm principle is simple, and program, which is realized, to be easy,
Calculation amount is small, and fault localization speed is fast.This method is reached using the impedance mapping function value at transmission line one-phase earth fault point
The single-ended precision ranging of transmission line one-phase earth fault is realized to this minimum characteristic, and transition resistance and load are eliminated in principle
The influence of electric current and power system operation mode has very high range accuracy, is adapted to carry out 500kV, 220kV and 110kV
The single end distance measurement function of transmission line one-phase earth fault.
To complete above-mentioned purpose, the present invention adopts the following technical scheme that：
Based on impedance mapping function amplitude characteristic line single phase grounding failure distance measuring method, which is characterized in that including as follows
Step：
(1) faulted phase voltage of protector measuring line protection installation placeFailure phase negative-sequence currentTherefore
Hinder phase currentAnd zero-sequence currentWherein, φ=A, B, C phase；
(2) protective device calculates boundary impedance
Wherein, z1、z0The respectively impedance of unit length electric transmission line positive sequence, zero sequence impedance；
ForImaginary part；ForImaginary part；φ=A, B,
C phases；
(3) it is l that protective device, which chooses fault distance initial value,x, calculate the l apart from line protection installation placexThat puts is comprehensive
Close impedance Δ Z+z1lx；
(4) protective device calculates the l apart from line protection installation placexThe impedance mapping function value of point
(5) fault distance lxIt is incremented by with fixed step size Δ l, return to step (3), successively every l on computing electric power linexPoint
Impedance mapping function valueUntil transmission line of electricity overall length；
(6) protective device chooses impedance mapping function value on transmission line of electricityMinimum is corresponding
Distance of the point away from line protection installation place be fault distance；Wherein, it is transmission line of electricity that fixed step size Δ l, which takes 0.001l, l,
Length.
The present invention compared with prior art, has following positive achievement：
The method of the present invention measures line protection installation place faulted phase voltage, faulted phase current, failure phase negative phase-sequence first
Electric current and zero-sequence current calculate boundary impedance, using the synthesis at every bit in linear search method successively computing electric power line
Then it is fixed to choose impedance on transmission line of electricity for impedance, and then the impedance mapping function value on computing electric power line at every bit successively
It is fault distance that bit function value, which reaches minimum distance of the point away from line protection installation place,.The method of the present invention is using collection Headquarters of the General Staff
Number modeling, algorithm principle is simple, and program, which is realized, to be easy, and calculation amount is small, and fault localization speed is fast.The method of the present invention utilizes power transmission line
Impedance mapping function value at the Single-phase Ground Connection Failure of road reaches this minimum characteristic and realizes transmission line one-phase earth fault list
Precision ranging is held, the influence of transition resistance and load current and power system operation mode is eliminated in principle, is had very high
Range accuracy is adapted to carry out the single end distance measurement function of 500kV, 220kV and 110kV transmission line one-phase earth fault.
Description of the drawings
Fig. 1 is the multi-line power transmission system schematic using the present invention.
Specific implementation mode
Technical scheme of the present invention is expressed in further detail below according to Figure of description.
Fig. 1 is the multi-line power transmission system schematic using the present invention.PT is voltage transformer in Fig. 1, CT is Current Mutual Inductance
Device.Protective device is to the voltage waveform of the voltage transformer pt of line protection installation place and the current wave of Current Transmit
Shape is sampled to obtain voltage, current instantaneous value, and utilizes the failure phase of Fourier algorithm computing electric power line protection installation place
VoltageFailure phase negative-sequence currentFaulted phase currentAnd zero-sequence currentAs input quantity；Wherein, φ=A phases, B
Phase, C phases；
Protective device calculates boundary impedance
Wherein, z1、z0The respectively impedance of unit length electric transmission line positive sequence, zero sequence impedance；
ForImaginary part；ForImaginary part.
Protective device utilizes faulted phase voltageDivided by zero sequence compensation electric currentIt obtains measuring impedance
It is l that protective device, which chooses fault distance initial value,x, calculate the l apart from line protection installation placexThe synthesis of point
Impedance Δ Z+z1lx。
Protective device calculates the l apart from line protection installation placexThe impedance mapping function value of point
Fault distance lxIt is incremented by with fixed step size Δ l, successively every l on computing electric power linexThe impedance mapping function value of pointUntil transmission line of electricity overall length；Wherein, it is transmission line of electricity that fixed step size Δ l, which takes 0.001l, l,
Length.
In the above process, fault distance lxIt is incremented by since 0 and with fixed step size Δ l, until transmission line of electricity overall length terminates
Complete every l on transmission line of electricityxImpedance mapping function value at point calculates.
Finally, protective device chooses impedance mapping function value on transmission line of electricityIt is minimum right
Distance of the point away from line protection installation place answered is fault distance.
The method of the present invention is modeled using lumped parameter, and algorithm principle is simple, and program, which is realized, to be easy, and calculation amount is small, and failure is surveyed
It is fast away from speed.The method of the present invention reaches this minimum spy using the impedance mapping function value at transmission line one-phase earth fault point
Property realize transmission line one-phase earth fault single end distance measurement, transition resistance and load current and electric system fortune are eliminated in principle
The influence of line mode has very high range accuracy.
The foregoing is merely the preferred embodiments of the present invention, but scope of protection of the present invention is not limited thereto, appoint
What those familiar with the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in, all
It is covered by the protection scope of the present invention.
Claims (1)
1. being based on impedance mapping function amplitude characteristic line single phase grounding failure distance measuring method, which is characterized in that including walking as follows
Suddenly：
(1) faulted phase voltage of protector measuring line protection installation placeFailure phase negative-sequence currentFailure phase
Electric currentAnd zero-sequence currentWherein, φ=A, B, C phase；
(2) protective device calculates boundary impedance
Wherein, z1、z0The respectively impedance of unit length electric transmission line positive sequence, zero sequence impedance；ForImaginary part；ForImaginary part；
(3) it is l that protective device, which chooses fault distance initial value,x, calculate the l apart from line protection installation placexThe comprehensive resistance of point
Anti- Δ Z+z1lx；
(4) protective device calculates the l apart from line protection installation placexThe impedance mapping function value of point
(5) fault distance lxIt is incremented by with fixed step size Δ l, return to step (3), successively every l on computing electric power linexThe resistance of point
Anti- mapping function valueUntil transmission line of electricity overall length；
(6) protective device chooses impedance mapping function value on transmission line of electricityMinimum corresponding point
Distance away from line protection installation place is fault distance；Wherein, it is that transmission line of electricity is long that fixed step size Δ l, which takes 0.001l, l,
Degree.
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| CN105242174B true CN105242174B (en) | 2018-10-16 |
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| CN105703340A (en) * | 2016-03-29 | 2016-06-22 | 国网福建省电力有限公司 | Adaptively-adjusted action boundary based single phase grounding fault relay protection method for power transmission line |
| CN105891669B (en) * | 2016-03-30 | 2019-01-25 | 国网福建省电力有限公司 | Line single phase grounding failure distance measuring method based on transition resistance actual measurement |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6256592B1 (en) * | 1999-02-24 | 2001-07-03 | Schweitzer Engineering Laboratories, Inc. | Multi-ended fault location system |
| CN102096019A (en) * | 2009-12-15 | 2011-06-15 | 黄洪全 | Method and device for locating single-phase grounding fault of low-current grounding system |
| CN102200563A (en) * | 2011-01-20 | 2011-09-28 | 福建省电力有限公司福州超高压输变电局 | Line single-phase earth fault single-terminal location method based on positioning function amplitude characteristics |
| CN104730415A (en) * | 2015-03-04 | 2015-06-24 | 国家电网公司 | Circuit-phase malfunction single-end distance measuring method based on impedance locating function amplitude character |
| CN104764977A (en) * | 2015-03-04 | 2015-07-08 | 国家电网公司 | Phase characteristic line phase-to-phase fault single-ended positioning method based on impedance positioning functions |
-
2015
- 2015-09-14 CN CN201510581628.XA patent/CN105242174B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6256592B1 (en) * | 1999-02-24 | 2001-07-03 | Schweitzer Engineering Laboratories, Inc. | Multi-ended fault location system |
| CN102096019A (en) * | 2009-12-15 | 2011-06-15 | 黄洪全 | Method and device for locating single-phase grounding fault of low-current grounding system |
| CN102200563A (en) * | 2011-01-20 | 2011-09-28 | 福建省电力有限公司福州超高压输变电局 | Line single-phase earth fault single-terminal location method based on positioning function amplitude characteristics |
| CN104730415A (en) * | 2015-03-04 | 2015-06-24 | 国家电网公司 | Circuit-phase malfunction single-end distance measuring method based on impedance locating function amplitude character |
| CN104764977A (en) * | 2015-03-04 | 2015-07-08 | 国家电网公司 | Phase characteristic line phase-to-phase fault single-ended positioning method based on impedance positioning functions |
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