CN104062555A - Identification method for distributing line high-resistance ground fault feature harmonic waves - Google Patents
Identification method for distributing line high-resistance ground fault feature harmonic waves Download PDFInfo
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- CN104062555A CN104062555A CN201410338298.7A CN201410338298A CN104062555A CN 104062555 A CN104062555 A CN 104062555A CN 201410338298 A CN201410338298 A CN 201410338298A CN 104062555 A CN104062555 A CN 104062555A
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Abstract
The invention relates to a method for distinguishing and identifying high-resistance ground fault feature harmonic waves and harmonic waves generated under other stations, and belongs to the field of power system protection and control. In the line running process, harmonic waves generated by other fault types such as three-phase grounded short circuit, two-phase grounded short circuit, two-phase interphase short circuit and load switching disturb high-resistance fault determination. According to the method, real-time collection is performed on higher harmonic waves of the zero-sequence voltage of the line, the FFT method is used for obtaining a harmonic wave frequency spectrum, and according to different frequency points and amplitudes of the feature harmonic waves, distinguishing is performed in the identifying process. The method is particularly suitable for small-current ground systems of 10 kV and below 10 kV, and a user only needs to collect zero-sequence voltage signals for analysis. Compared with an existing discriminated method, the method has the advantages that information collection is more convenient, sensitivity is higher, the fault can be effectively distinguished with other normal stations and other fault types, the high-resistance fault can be distinguished more clearly, and distinguishing is not affected by other interferences.
Description
Technical field
The invention belongs to protecting electrical power system and control field, particularly 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 electric system, and itself does not have too serious harm, but easily causes more serious accident.To finding from field failure analysis, in phase-to phase fault, quite a few is to be developed by singlephase earth fault.For this type of fault, GPF (General Protection False is inoperative, and short-circuit current is little, is difficult to identification and location, causes the fault initial stage to be difficult to be found.Harmonic wave in the residual voltage current signal that utilizes faulty line tends to be subject to the impact that circuit other types fault and some special circumstances produce harmonic waves can cause carrying out the differentiation of fault and identification during as criterion time.Rationally effectively make the harmonic wave that single-phase high resistance earthing fault produces be distinguished for the identification of the single-phase high resistance earthing fault of power distribution network significant with the harmonic wave of other situations generations.
While utilizing criterion accurately to carry out the on-line identification of power distribution network high resistance earthing fault and monitoring, can realize that one-phase earthing failure in electric distribution network is found in time, early warning in time, location, the object processed in time in time, be unlikely to develop into catastrophic failure, thereby eliminate potential faults.Rationally criterion is determining again the precision maneuver of device accurately, thereby can reduce mistake action and rejecting action and realize sensitivity and the reliability of on-line identification and monitoring device.
But when network operation, exist various disturbances, particularly at the power distribution network near load side, the switching of load, start and stop suddenly all can produce a lot of harmonic componentss in zero sequence signal.In addition, conventional fault occurs and protection action can produce very high harmonic component equally, and can disturbance harmonic wave and the high resistance earthing fault characteristic harmonics that effectively distinguish this type of directly affect the accuracy of protecting judgement.
Summary of the invention
Need to utilize harmonic frequency and amplitude to carry out distinguishing of characteristic harmonics owing to being applied at present the detection method of the single-phase high resistance earthing fault of low-voltage network, the harmonic wave producing with other fault types on circuit and switching load needs difference, to improve the accuracy of fault identification.The object of this invention is to provide a kind of discrimination method of transmission line of electricity high resistance earthing fault characteristic harmonics, produced humorous wave frequency, amplitude and have or not DC component to distinguish the characteristic harmonics of high resistance earthing fault according to other fault types of circuit, switching load.
In order to reach above object, technical scheme of the present invention is:
The discrimination method of described distribution line high resistive fault characteristic harmonics, is characterized in that, comprises the following steps.
1) fault signature harmonic frequency, amplitude while determining that according to line topological structure the single-phase high resistance earthing fault of distribution line occurs, be defined as harmonic frequency (certain concrete numerical value between 1000 ~ 5000Hz), amplitude (fundamental voltage amplitude 5% ~ 9% concrete amplitude) and without DC component.
2) according to line topological structure, while determining above-mentioned circuit generation switching load, the higher hamonic wave feature producing in line zero sequence voltage, be that harmonic frequency mostly is 2 ~ 5 frequencys multiplication, and there is very high DC component, can using this as and single-phase high resistance earthing fault frequency between 1000 ~ 5000Hz, amplitude is fundamental voltage amplitude 5% ~ 9%, and does not contain the differentiation of the characteristic harmonics of DC component.
3) according to line topological structure, while determining above-mentioned circuit generation three-phase ground fault, the higher hamonic wave feature producing in line zero sequence voltage, more than harmonic frequency mainly concentrates on 6000Hz, harmonic amplitude is fundamental voltage amplitude between 0.2% ~ 1.2%.Can using this as and single-phase high resistance earthing fault frequency between 1000 ~ 5000Hz, amplitude is fundamental voltage amplitude 5% ~ 9%, and does not contain the differentiation of the characteristic harmonics of DC component.
4) according to line topological structure, while determining above-mentioned circuit generation two-phase phase fault, the higher hamonic wave feature producing in line zero sequence voltage, harmonic frequency mainly concentrates on 2000Hz, and harmonic amplitude is fundamental voltage amplitude below 0.6%.Can using this as and single-phase high resistance earthing fault frequency between 1000 ~ 5000Hz, amplitude is fundamental voltage amplitude 5% ~ 9%, and does not contain the differentiation of the characteristic harmonics of DC component.
5) according to line topological structure, while determining above-mentioned circuit generation two-phase short circuit and ground fault, the higher hamonic wave feature producing in line zero sequence voltage, harmonic frequency mainly concentrates on 4000Hz, and harmonic amplitude is between 50% ~ 450% fundamental voltage amplitude.Can using this as and single-phase high resistance earthing fault frequency between 1000 ~ 5000Hz, amplitude is fundamental voltage amplitude 5% ~ 9%, and does not contain the differentiation of the characteristic harmonics of DC component.
Compared with prior art, the beneficial effect of patent of the present invention is:
1) according to theory maturation, discrimination is obvious, each situation harmonic wave is with conspicuous characteristics aspect frequency, amplitude and DC component content;
2) discrimination method is simple, and accordingly for realizing, the logic circuit structure of discriminating function is simple, surveying instrument equipment and technology maturation, has overcome and in actual production operational process, has been difficult to the shortcoming that realizes.
Brief description of the drawings
The figure of residual voltage frequency spectrum when Fig. 1 is power distribution network switching load of the present invention.
Fig. 2 is the figure of power distribution network generation three-phase ground short trouble residual voltage frequency spectrum of the present invention.
Fig. 3 is the figure of power distribution network generation two-phase phase fault residual voltage frequency spectrum of the present invention.
Fig. 4 is the figure of power distribution network generation two-phase short circuit and ground fault residual voltage frequency spectrum of the present invention.
Embodiment
A kind of discrimination method embodiment of transmission line of electricity high resistance earthing fault characteristic harmonics is:
1) according to line topological structure, determine fault signature harmonic frequency, amplitude when the single-phase high resistance earthing fault of distribution line occurs, be defined as harmonic frequency (certain concrete numerical value between 1000 ~ 5000Hz), amplitude (fundamental voltage amplitude 5% ~ 9% concrete amplitude) and without DC component.Each cycle carries out one-time detection analysis, meets above-mentioned feature and is difficult the characteristic harmonics of the high resistance earthing fault regarded as of lower narrating characteristic, can this carry out the judgement of high resistance earthing fault.
2) according to line topological structure, while determining above-mentioned circuit generation switching load, the higher hamonic wave feature producing in line zero sequence voltage, be that harmonic frequency mostly is 2 ~ 5 frequencys multiplication, and there is very high DC component, can using this as and single-phase high resistance earthing fault frequency between 1000 ~ 5000Hz, amplitude is fundamental voltage amplitude 5% ~ 9%, and does not contain the differentiation of the characteristic harmonics of DC component.Each cycle carries out one-time detection analysis, if harmonic spectrum composition meets described in eigen in circuit, as Fig. 1, regards as the switching of line load, does not carry out judgement and the computing the resistor value of high resistance earthing fault as the criterion of high resistance earthing fault.
3) according to line topological structure, while determining above-mentioned circuit generation three-phase ground fault, the higher hamonic wave feature producing in line zero sequence voltage, more than harmonic frequency mainly concentrates on 6000Hz, harmonic amplitude is fundamental voltage amplitude between 0.2% ~ 1.2%.Can using this as and single-phase high resistance earthing fault frequency between 1000 ~ 5000Hz, amplitude is fundamental voltage amplitude 5% ~ 9%, and does not contain the differentiation of the characteristic harmonics of DC component.Each cycle carries out one-time detection analysis, if harmonic spectrum composition meets described in eigen in circuit, as Fig. 2, regards as circuit three-phase ground fault, does not carry out judgement and the computing the resistor value of high resistance earthing fault as the criterion of high resistance earthing fault.
4) according to line topological structure, while determining above-mentioned circuit generation two-phase phase fault, the higher hamonic wave feature producing in line zero sequence voltage, harmonic frequency mainly concentrates on 2000Hz, and harmonic amplitude is fundamental voltage amplitude below 0.6%.Can using this as and single-phase high resistance earthing fault frequency between 1000 ~ 5000Hz, amplitude is fundamental voltage amplitude 5% ~ 9%, and does not contain the differentiation of the characteristic harmonics of DC component.Each cycle carries out one-time detection analysis, if harmonic spectrum composition meets as described in eigen as figure in circuit, as Fig. 3, regards as circuit two-phase phase fault, does not carry out judgement and the computing the resistor value of high resistance earthing fault as the criterion of high resistance earthing fault.
5) according to line topological structure, while determining above-mentioned circuit generation two-phase short circuit and ground fault, the higher hamonic wave feature producing in line zero sequence voltage, harmonic frequency mainly concentrates on 4000Hz, and harmonic amplitude is between 50% ~ 450% fundamental voltage amplitude.Can using this as and single-phase high resistance earthing fault frequency between 1000 ~ 5000Hz, amplitude is fundamental voltage amplitude 5% ~ 9%, and does not contain the differentiation of the characteristic harmonics of DC component.Each cycle carries out one-time detection analysis, if harmonic spectrum composition meets as described in eigen as figure in circuit, as Fig. 4, regards as circuit two-phase short circuit and ground fault, does not carry out judgement and the computing the resistor value of high resistance earthing fault as the criterion of high resistance earthing fault.
The foregoing is only better embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. the discrimination method of a distribution line high resistance earthing fault characteristic harmonics, it is characterized in that, the harmonic wave that other transient processes of the characteristic harmonics producing when single-phase high resistance earthing fault occurs distribution network line and circuit produce while generation has interference, utilize high resistance earthing fault characteristic harmonics frequency (between 1000 ~ 5000Hz), amplitude (up to the feature of first-harmonic 5% ~ 9%) and have or not DC component, comprehensive relatively two-phase short circuit and ground fault, phase fault, the factor of the similar harmonic waves of various generations such as three-phase ground short trouble and switching load, carry out feature identification, improve criterion accuracy, avoid erroneous judgement.
2. method as claimed in claim 1, is characterized in that, in distribution system, the harmonic wave that single-phase high resistance earthing fault produces at residual voltage is mainly between 1000 ~ 5000Hz, and amplitude is up to 5% ~ 9% fundametal compoment, and DC component is very little.
3. method as claimed in claim 1, is characterized in that, the harmonic wave producing in residual voltage while utilizing circuit switching load in distribution system mostly is the harmonic wave of 2 ~ 5 frequencys multiplication, and has very high DC component and high resistance earthing fault characteristic harmonics to distinguish.
4. method as claimed in claim 1, it is characterized in that, more than the harmonic frequency producing in residual voltage while utilizing three-phase ground fault in distribution system mainly concentrates on 6000Hz, harmonic amplitude is fundamental voltage amplitude distinguishes with high resistance earthing fault characteristic harmonics between 0.2% ~ 1.2%.
5. method as claimed in claim 1, it is characterized in that, the harmonic frequency producing in residual voltage while utilizing two-phase phase fault in distribution system to occur mainly concentrates on 2000Hz, and harmonic amplitude is fundamental voltage amplitude below 0.6% and high resistance earthing fault characteristic harmonics is distinguished.
6. method as claimed in claim 1, it is characterized in that, the harmonic frequency producing in residual voltage while utilizing two-phase short circuit and ground fault in distribution system mainly concentrates on 4000Hz, and harmonic amplitude is distinguished with high resistance earthing fault characteristic harmonics between 50% ~ 450% fundamental voltage amplitude.
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| DE102016208322A1 (en) * | 2016-05-13 | 2017-11-16 | Bender Gmbh & Co. Kg | Method and apparatus for arc fault detection in an ungrounded power system |
| CN110780160A (en) * | 2019-12-06 | 2020-02-11 | 广东电网有限责任公司 | Arc light high-resistance grounding fault detection method and device |
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| CN115951114A (en) * | 2023-01-17 | 2023-04-11 | 上海山源电子科技股份有限公司 | Current signal identification method in power supply monitoring system |
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| CN110780160A (en) * | 2019-12-06 | 2020-02-11 | 广东电网有限责任公司 | Arc light high-resistance grounding fault detection method and device |
| CN110780160B (en) * | 2019-12-06 | 2021-10-19 | 广东电网有限责任公司 | Arc light high-resistance grounding fault detection method and device |
| CN115951114A (en) * | 2023-01-17 | 2023-04-11 | 上海山源电子科技股份有限公司 | Current signal identification method in power supply monitoring system |
| CN115951114B (en) * | 2023-01-17 | 2023-06-23 | 上海山源电子科技股份有限公司 | Current signal identification method in power supply monitoring system |
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