CN104090211B - A kind of online test method of distribution line high resistance earthing fault - Google Patents
A kind of online test method of distribution line high resistance earthing fault Download PDFInfo
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- CN104090211B CN104090211B CN201410338248.9A CN201410338248A CN104090211B CN 104090211 B CN104090211 B CN 104090211B CN 201410338248 A CN201410338248 A CN 201410338248A CN 104090211 B CN104090211 B CN 104090211B
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Abstract
The invention discloses the online test method of a kind of distribution line high resistance earthing fault; by the residual voltage waveform in 2 ~ 3 cycles after recording high resistance earthing fault and occurring; its harmonic spectrum has contained the fault message of high resistance ground; can be used for the on-line checking of high resistance earthing fault, belong to protecting electrical power system and control field.This method gathers the residual voltage harmonic wave of Circuit Fault on Secondary Transformer feeder line, determines fault signature harmonic frequency (generally between 1000 ~ 5000Hz) according to wire topologies, by detection harmonic amplitude and frequency, it is judged that whether circuit there occurs high resistance earthing fault.The method is particularly suited for 10kV and following small current neutral grounding system, only need to gather residual voltage signal and be analyzed.Information gathering is convenient compared with existing method of discrimination, sensitivity is higher, be effectively different from other operating modes and fault type, reduces tripping and malfunction, and identification is more accurate.
Description
Technical field
The invention belongs to protecting electrical power system and control field, particularly to the detection method of a kind of low pressure for small current neutral grounding system (6 ~ 10kV) distribution line high resistance earthing fault.
Technical background
Singlephase earth fault is fault common in power system, itself does not have serious hazardness, but the most easily draws its more serious accident.Finding from field failure analysis, in all of phase-to phase fault, having quite a few is to be developed by singlephase earth fault.6 ~ 10kV distribution line is near user, and surrounding is complicated, it is easy to high resistance earthing fault occurs, so the on-line monitoring detection method for distribution line gets a good eye value.Circuit typically uses small current neutral grounding system, and during system generation single-phase high-impedance, short circuit current is little, and GPF (General Protection False is inoperative for this type of fault, it is difficult to identification and detection, and the causing trouble initial stage is difficult to be found.Even if most high resistance earthing faults are in short-term, can die away, but also have quite a few fault to be easily evolved into even more serious direct short-circuit fault.
Carry out on-line identification and the monitoring of power distribution network high resistance earthing fault, can find in time, timely early warning, in time location, process in time, be unlikely to develop into catastrophe failure, thus eliminate potential faults, reduce the generation of power outage, it is ensured that power supply continuity and power supply reliability.Additionally, by the on-line monitoring of high resistance ground is detected, moreover it is possible to the high resistance earthing fault for spontaneous recovery in short-term carries out statistical analysis, determines high resistance earthing fault region occurred frequently, carries out in advance preventing and processing.Therefore, high resistance earthing fault feature is studied from the angle improving power distribution network operational reliability, have highly important meaning.
Some characteristic quantities of mainly voltage and current signal waveform by obtaining are studied for high resistive fault before and carry out identification and the protection of high resistance earthing fault.The wavelet coefficient utilizing the multiresolution analysis to fault-signal to produce takes absolute value and constitutes the criterion of high resistive fault.But show that this algorithm is for information acumens the most not such as failure modes, earth resistance resistance, abort situation by the analysis of system；Propose by monitoring the method for the change-detection high resistance earthing fault of the energy of even-order harmonic produced by zero-sequence current.At the high resistance earthing fault of more than 5A, there is the highest accuracy rate for fault current, but the range of application of the program is the transmission line of electricity based on 110kV and above, is difficult with for distribution line.
Summary of the invention
Owing to the fault signature of current low-voltage network single-phase high-impedance is the most inconspicuous, GPF (General Protection False and apply the discrimination method effect in voltage levels the most undesirable.It is an object of the invention to provide the online test method of a kind of transmission line of electricity high resistance earthing fault, determined faulty line characteristic harmonics according to the topological structure of circuit, harmonic frequency is generally between 1000 ~ 5000Hz, and amplitude reaches fundamental voltage amplitude 5% ~ 7%.The generation of single-phase high-impedance is monitored by characteristic harmonics frequency spectrum in detection faulty line residual voltage.
In order to reach object above, the technical scheme is that the online test method of a kind of transmission line of electricity high resistance earthing fault, it is characterised in that comprise the following steps:
The online test method of described distribution line high resistance earthing fault, it is characterised in that comprise the following steps:
1) fault signature harmonic frequency is determined according to wire topologies；
2) residual voltage of Circuit Fault on Secondary Transformer feeder line being carried out on-line monitoring, it is thus achieved that sampled value F (n) of a cycle, n=1,2 N, N are integer, and value is 120 ~ 240；
3) by the fft analysis to sampled value sequence, analysis spectrum is drawn with power-frequency voltage for first-harmonic；
4) verify whether to there occurs frequency fN: the characteristic harmonics amplitude of 1000 ~ 5000Hz reaches the spike Characteristics of Mutation of fundamental voltage amplitude 5% ~ 7%, if meeting this high resistance earthing fault criterion, then regards as high resistance earthing fault；
5) within every 0.02 second, it is repeated once step (1) ~ (4), obtains whether each cycle occurs the result of high resistance earthing fault.
The online test method of described distribution line high resistance earthing fault, when single-phase high-impedance occurs, the harmonic wave produced in faulty line residual voltage waveform carries out spectrum analysis can find to produce spike sudden change at a certain frequency, according to different wire topologies, this frequency is between 1000 ~ 5000Hz.Having contained the fault message of high resistance ground in this sudden change, this harmonic wave that frequency is the highest can be described as high resistive fault characteristic harmonics, by being analyzed this feature harmonic wave, verifies whether to meet failure criterion, carries out the identification of fault with this.
The online test method of described distribution line high resistance earthing fault, extracting of single-phase high-impedance characteristic harmonics needs to utilize the online acquisition device installed, the residual voltage collected is carried out real-time FFT spectrum analysis, extracts the size of the frequency of high resistive fault characteristic harmonics, amplitude and DC component.
The online test method of described distribution line high resistance earthing fault, for high resistive fault characteristic harmonics spectrum analysis, it is that frequency is, amplitude reaches fundamental voltage amplitude 5% ~ 7% between 1000 ~ 5000Hz that the criterion of high resistance earthing fault occurs.
The online test method of described distribution line high resistance earthing fault can carry out the estimation of different earth resistance resistances according to the amplitude of high resistive fault characteristic harmonics and the form of frequency spectrum.After determining wire topologies acquisition line parameter circuit value, it may be determined that line fault characteristic harmonics amplitude is with fault resstance variation rule curve.Work as line failure, it determines go out after being high resistance earthing fault, as reference value, the fault resstance of circuit can be estimated using this curve.
The online test method of described distribution line high resistance earthing fault, can carry out fault phase angle and the estimation of residual voltage instantaneous value according to the amplitude of high resistive fault characteristic harmonics and the form of frequency spectrum.After determining wire topologies acquisition line parameter circuit value, it may be determined that line fault characteristic harmonics form is with fault phase angle variation rule curve.When picking out after circuit generation single-phase high-impedance determines fault, fault phase angle and the instantaneous voltage of circuit can be estimated using this curve as reference value.
Compared with prior art, patent of the present invention provides the benefit that:
1) according to theoretical ripe, engineering reliability is high, and identification analytical effect is stable, overcomes the unconspicuous weakness of signal characteristic for identification.
2) ripe for realizing the measuring instrument equipment and technology of discriminating function, overcome the shortcoming being difficult in actual production running.
3) on the basis of monitoring in real time, fault occurrence frequency statistical analysis be can be carried out, reliable data support and directiveness suggestion provided for line upkeep work.
Accompanying drawing explanation
Fig. 1 be fault resistance of the present invention be the emulation pattern of 500 Ω high resistive fault characteristic harmonics frequency spectrums.
Fig. 2 is that the present invention emulates pattern about characteristic harmonics amplitude with fault resstance Changing Pattern.
Detailed description of the invention
The online test method detailed description of the invention of a kind of distribution line high resistance earthing fault is:
1) fault signature harmonic frequency is determined according to wire topologies.
2) residual voltage of Circuit Fault on Secondary Transformer feeder line is carried out on-line monitoring, it is thus achieved that sampled value f(n of a cycle), n=1,2 N, N are integer, and value is 120 ~ 240.
3) by sampled value sequence is carried out fft analysis, analysis spectrum is drawn with power-frequency voltage for first-harmonic.
4) verify whether to there occurs frequency fN: the characteristic harmonics amplitude of 1000 ~ 5000Hz reaches the spike Characteristics of Mutation of fundamental voltage amplitude 5% ~ 7%.If meeting this criterion of high resistance earthing fault, then regard as high resistance earthing fault.
5) harmonic amplitude that the characteristic harmonics amplitude recorded according to faulty line and wire topologies obtain estimates fault resstance resistance with fault resstance Changing Pattern.
6) harmonic amplitude that the characteristic harmonics spectrum morphology recorded according to faulty line and wire topologies obtain is with fault resstance Changing Pattern estimation fault phase angle and instantaneous voltage.
Within every 0.02 second, it is repeated more than once step.
The foregoing is only the preferable embodiment of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (5)
1. the online test method of a distribution line high resistance earthing fault, it is characterised in that
Comprise the following steps:
1) fault signature harmonic frequency is determined according to wire topologies；
2) residual voltage of Circuit Fault on Secondary Transformer feeder line is carried out on-line monitoring, it is thus achieved that a week
Sampled value F (n) of ripple, n=1,2 N, N are integer, and value is 120～240；
3) by the fft analysis to sampled value sequence, analysis is drawn with power-frequency voltage for first-harmonic
Frequency spectrum；
4) verify whether to there occurs frequency fN: the characteristic harmonics amplitude of 1000～5000Hz is higher than
The spike Characteristics of Mutation of fundamental voltage amplitude 5%, if meeting described spike Characteristics of Mutation, then assert
For high resistance earthing fault；
5) within every 0.02 second, it is repeated once step (1)～(4), obtains whether each cycle occurs high resistant
The result of earth fault；
Utilize the online acquisition device of installing, the residual voltage collected is carried out real-time FFT
Spectrum analysis, extracts the big of the frequency of high resistive fault characteristic harmonics, amplitude and DC component
Little.
2. method as claimed in claim 1, it is characterised in that when fault occurs, faulty line
Residual voltage waveform harmonics frequency spectrum can produce spike sudden change, high resistance ground has been contained in this sudden change
Fault message, can be described as high resistive fault characteristic harmonics, by the analysis of this feature harmonic wave is entered
The identification of row fault.
3. method as claimed in claim 1, it is characterised in that for high resistive fault characteristic harmonics
Analysis, occur the criterion of high resistance earthing fault be frequency be between 1000～5000Hz, width
Value reaches fundamental voltage amplitude 5%～7%.
4. method as claimed in claim 1, it is characterised in that according to high resistive fault characteristic harmonics
Amplitude and the form of frequency spectrum, the estimation of different earth resistance resistances can be carried out.
5. method as claimed in claim 1, it is characterised in that according to high resistive fault characteristic harmonics
Amplitude and the form of frequency spectrum, fault phase angle and the estimation of residual voltage instantaneous value can be carried out.
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| CN201410338248.9A CN104090211B (en) | 2014-07-16 | 2014-07-16 | A kind of online test method of distribution line high resistance earthing fault |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316791A (en) * | 2014-10-21 | 2015-01-28 | 国家电网公司 | Reason analyzing and locating method for high resistance grounding fault of transmission line |
| CN106597222B (en) * | 2016-12-16 | 2019-06-11 | 湖北省超能超高压电力科技开发有限公司 | A kind of transmission line of electricity overvoltage fault type recognition method based on ground line current |
| CN109001593B (en) * | 2018-07-16 | 2020-09-25 | 北京映翰通网络技术股份有限公司 | Fault recording control method for power distribution network |
| CN110108972B (en) * | 2019-06-26 | 2021-10-08 | 云南电网有限责任公司电力科学研究院 | Arc detection method for single-phase high-resistance earth fault |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1696722A (en) * | 2005-06-02 | 2005-11-16 | 昆明理工大学 | Malfunction route selection method for resonant grounded system based on current decomposition and wattles detection |
| CN101187687A (en) * | 2007-12-21 | 2008-05-28 | 清华大学 | High resistance earthing fault detection method based on transient traveling wave |
| CN101482593A (en) * | 2008-12-25 | 2009-07-15 | 南京因泰莱配电自动化设备有限公司 | Low-current grounding intelligent route selection method and apparatus |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1696722A (en) * | 2005-06-02 | 2005-11-16 | 昆明理工大学 | Malfunction route selection method for resonant grounded system based on current decomposition and wattles detection |
| CN101187687A (en) * | 2007-12-21 | 2008-05-28 | 清华大学 | High resistance earthing fault detection method based on transient traveling wave |
| CN101482593A (en) * | 2008-12-25 | 2009-07-15 | 南京因泰莱配电自动化设备有限公司 | Low-current grounding intelligent route selection method and apparatus |
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