CN104062555B - The discrimination method of distribution line high resistance earthing fault characteristic harmonics - Google Patents
The discrimination method of distribution line high resistance earthing fault characteristic harmonics Download PDFInfo
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- CN104062555B CN104062555B CN201410338298.7A CN201410338298A CN104062555B CN 104062555 B CN104062555 B CN 104062555B CN 201410338298 A CN201410338298 A CN 201410338298A CN 104062555 B CN104062555 B CN 104062555B
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Abstract
The present invention relates to a kind of high resistance earthing fault characteristic harmonics with the differentiation of harmonic wave produced under other operating mode and discrimination method, belong to protecting electrical power system and control field.In circuit running, other fault types such as: three-phase ground short circuit, two-phase grounding fault, biphase phase fault and load switching time produce harmonic wave to high resistive fault screen have interference.The higher hamonic wave of the residual voltage of circuit is done Real-time Collection by this method, obtains harmonic spectrum by FFT method, is distinguish between in identification process according to its characteristic harmonics different frequent points and amplitude.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 distinguish between with other nominal situation and other fault types, more clearly from picks out high resistive fault and not by other interference effects.
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 the most serious harm, but easily causes more serious accident.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, it is difficult to identification and location, and the causing trouble initial stage is difficult to be found.Can cause often being produced harmonic wave by circuit other types fault and some special circumstances during differentiation and the identification carrying out fault when harmonic wave in the residual voltage current signal utilizing faulty line is as criterion to be affected.It is significant that the harmonic wave rationally effectively making single-phase high-impedance produce is distinguish between the identification for power distribution network single-phase high-impedance with the harmonic wave that other situations produce.
Utilize criterion accurately to carry out during on-line identification and the monitoring of power distribution network high resistance earthing fault can to realize one-phase earthing failure in electric distribution network to find in time, timely early warning, in time location, the purpose processed in time, it is unlikely to develop into catastrophe failure, thus eliminates potential faults.Rationally criterion decides again the precision maneuver of device the most accurately, it is possible to reduce malfunction and tripping thus realize on-line identification and the susceptiveness of monitoring device and reliability.
But there is various disturbance during network operation, particularly at the power distribution network near load side, the switching of load, unexpected start and stop all can produce a lot of harmonic components in zero sequence signal.Additionally, the fault of routine occurs and protection act can produce the highest harmonic component equally, can disturbance harmonic wave and the high resistance earthing fault characteristic harmonics that effectively distinguish this type of directly affect the accuracy that protection judges.
Summary of the invention
Need to utilize harmonic frequency and amplitude to carry out distinguishing of characteristic harmonics owing to being applied to the detection method of low-voltage network single-phase high-impedance at present, load produced harmonic wave with other fault types on circuit and switching and need difference, to improve the accuracy of fault identification.It is an object of the invention to provide the discrimination method of a kind of transmission line of electricity high resistance earthing fault characteristic harmonics, produced the frequency of harmonic wave, amplitude according to other fault types of circuit, switching load and distinguish the characteristic harmonics of high resistance earthing fault with or without DC component.
In order to reach object above, the technical scheme is that
The discrimination method of described distribution line high resistive fault characteristic harmonics, it is characterised in that comprise the following steps.
1) fault signature harmonic frequency when determining that distribution line single-phase high-impedance occurs according to wire topologies, amplitude, be defined as harmonic frequency (certain concrete numerical value between 1000 ~ 5000Hz), amplitude (the concrete amplitude of the 5% ~ 9% of fundamental voltage amplitude) and without DC component.
2) according to wire topologies, determine when above-mentioned circuit generation switching loads, the higher hamonic wave feature produced in line zero sequence voltage, i.e. harmonic frequency mostly is 2 ~ 5 frequencys multiplication, and there is the highest DC component, can be in this, as single-phase high-impedance frequency between 1000 ~ 5000Hz, amplitude is the 5% ~ 9% of fundamental voltage amplitude, and does not contains the differentiation of the characteristic harmonics of DC component.
3), according to wire topologies, when determining above-mentioned circuit generation three-phase ground fault, the higher hamonic wave feature produced in line zero sequence voltage, i.e. harmonic frequency is concentrated mainly on more than 6000Hz, and harmonic amplitude is between the 0.2% ~ 1.2% of fundamental voltage amplitude.Can be in this, as single-phase high-impedance frequency between 1000 ~ 5000Hz, amplitude is the 5% ~ 9% of fundamental voltage amplitude, and does not contains the differentiation of the characteristic harmonics of DC component.
4) according to wire topologies, determine that, when above-mentioned circuit occurs biphase phase fault, the higher hamonic wave feature produced in line zero sequence voltage, i.e. harmonic frequency is concentrated mainly on 2000Hz, and harmonic amplitude is less than the 0.6% of fundamental voltage amplitude.Can be in this, as single-phase high-impedance frequency between 1000 ~ 5000Hz, amplitude is the 5% ~ 9% of fundamental voltage amplitude, and does not contains the differentiation of the characteristic harmonics of DC component.
5), according to wire topologies, when determining above-mentioned circuit generation two-phase short circuit and ground fault, the higher hamonic wave feature produced in line zero sequence voltage, i.e. harmonic frequency is concentrated mainly on 4000Hz, and harmonic amplitude is between the fundamental voltage amplitude of 50% ~ 450%.Can be in this, as single-phase high-impedance frequency between 1000 ~ 5000Hz, amplitude is the 5% ~ 9% of fundamental voltage amplitude, and does not contains the differentiation of the characteristic harmonics of DC component.
Compared with prior art, patent of the present invention provides the benefit that:
1) according to theoretical ripe, discrimination is obvious, and each situation harmonic wave is with conspicuous characteristics in terms of frequency, amplitude and DC component content；
2) discrimination method is simple, and the corresponding logic circuit structure for realizing discriminating function is simple, measuring instrument equipment and technology is ripe, overcomes the shortcoming being difficult in actual production running.
Accompanying drawing explanation
The figure of residual voltage frequency spectrum when Fig. 1 is power distribution network switching of the present invention load.
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 that power distribution network of the present invention occurs biphase phase fault residual voltage frequency spectrum.
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.
Detailed description of the invention
The discrimination method detailed description of the invention of a kind of transmission line of electricity high resistance earthing fault characteristic harmonics is:
1) according to wire topologies, determine fault signature harmonic frequency when distribution line single-phase high-impedance occurs, amplitude, be defined as harmonic frequency (certain concrete numerical value between 1000 ~ 5000Hz), amplitude (the concrete amplitude of the 5% ~ 9% of fundamental voltage amplitude) and without DC component.Each cycle carries out one-time detection analysis, meets features described above and is difficult the characteristic harmonics of the high resistance earthing fault regarded as of lower narrating characteristic, can carry out the judgement of high resistance earthing fault with this.
2) according to wire topologies, determine when above-mentioned circuit generation switching loads, the higher hamonic wave feature produced in line zero sequence voltage, i.e. harmonic frequency mostly is 2 ~ 5 frequencys multiplication, and there is the highest DC component, can be in this, as single-phase high-impedance frequency between 1000 ~ 5000Hz, amplitude is the 5% ~ 9% of fundamental voltage amplitude, and does not contains 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, such as Fig. 1, then regards as the switching of line load, carries out judgement and the computing the resistor value of high resistance earthing fault not as the criterion of high resistance earthing fault.
3), according to wire topologies, when determining above-mentioned circuit generation three-phase ground fault, the higher hamonic wave feature produced in line zero sequence voltage, i.e. harmonic frequency is concentrated mainly on more than 6000Hz, and harmonic amplitude is between the 0.2% ~ 1.2% of fundamental voltage amplitude.Can be in this, as single-phase high-impedance frequency between 1000 ~ 5000Hz, amplitude is the 5% ~ 9% of fundamental voltage amplitude, and does not contains 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, such as Fig. 2, then regards as circuit three-phase ground fault, carries out judgement and the computing the resistor value of high resistance earthing fault not as the criterion of high resistance earthing fault.
4) according to wire topologies, determine that, when above-mentioned circuit occurs biphase phase fault, the higher hamonic wave feature produced in line zero sequence voltage, i.e. harmonic frequency is concentrated mainly on 2000Hz, and harmonic amplitude is less than the 0.6% of fundamental voltage amplitude.Can be in this, as single-phase high-impedance frequency between 1000 ~ 5000Hz, amplitude is the 5% ~ 9% of fundamental voltage amplitude, and does not contains the differentiation of the characteristic harmonics of DC component.Each cycle carries out one-time detection analysis, if harmonic spectrum composition is as described in figure meets eigen in circuit, such as Fig. 3, then regards as the biphase phase fault of circuit, carries out judgement and the computing the resistor value of high resistance earthing fault not as the criterion of high resistance earthing fault.
5), according to wire topologies, when determining above-mentioned circuit generation two-phase short circuit and ground fault, the higher hamonic wave feature produced in line zero sequence voltage, i.e. harmonic frequency is concentrated mainly on 4000Hz, and harmonic amplitude is between the fundamental voltage amplitude of 50% ~ 450%.Can be in this, as single-phase high-impedance frequency between 1000 ~ 5000Hz, amplitude is the 5% ~ 9% of fundamental voltage amplitude, and does not contains the differentiation of the characteristic harmonics of DC component.Each cycle carries out one-time detection analysis, if harmonic spectrum composition is as described in figure meets eigen in circuit, such as Fig. 4, then regards as circuit two-phase short circuit and ground fault, carries out judgement and the computing the resistor value of high resistance earthing fault not as the criterion of high resistance earthing fault.
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 (1)
1. the discrimination method of a distribution line high resistance earthing fault characteristic harmonics, it is characterised in that distribution netting twine
Road occurs the characteristic harmonics produced during single-phase high-impedance and other transient processes of circuit to produce when occurring
Harmonic wave has interference, utilizes high resistance earthing fault characteristic harmonics frequency, amplitude and with or without DC component, comprehensively than
Relatively two-phase short circuit and ground fault, phase fault, three-phase ground fault and switching load these four produce
The factor of similar harmonic wave, carries out feature identification, improves criterion accuracy, avoids erroneous judgement；
In distribution system, single-phase high-impedance is mainly 1000～5000Hz at the harmonic wave that residual voltage produces
Between, amplitude is up to the fundametal compoment of 5%～9%, and without DC component, each cycle carries out one-time detection
Analyze, meet the harmonic characteristic that single-phase high-impedance produces at residual voltage and regard as high resistance earthing fault
Characteristic harmonics, carry out the judgement of high resistance earthing fault；
The harmonic wave produced in residual voltage when utilizing circuit switching load in distribution system mostly is the humorous of 2～5 frequencys multiplication
Ripple, and have the highest DC component to make a distinction with high resistance earthing fault characteristic harmonics, each cycle is carried out
One-time detection is analyzed, if produce in residual voltage when in circuit, harmonic spectrum composition meets switching load is humorous
Wave characteristic, then regard as the switching of line load, and the criterion not as high resistance earthing fault carries out high resistance ground
The judgement of fault and computing the resistor value；
The harmonic frequency produced in residual voltage when utilizing three-phase ground fault in distribution system is concentrated mainly on
More than 6000Hz, harmonic amplitude be fundamental voltage amplitude 0.2%～1.2% between with high resistance earthing fault characteristic harmonics
Making a distinction, each cycle carries out one-time detection analysis, if harmonic spectrum composition meets three and connects in circuit
The harmonic characteristic produced in residual voltage during earth fault, then regard as circuit three-phase ground fault, not as height
The criterion of resistance earth fault carries out judgement and the computing the resistor value of high resistance earthing fault；
Utilize the harmonic frequency produced in residual voltage when biphase phase fault occurs in distribution system main
Concentrating on 2000Hz, harmonic amplitude is that less than the 0.6% of fundamental voltage amplitude is carried out with high resistance earthing fault characteristic harmonics
Distinguishing, each cycle carries out one-time detection analysis, if harmonic spectrum composition meets biphase alternate short in circuit
The harmonic characteristic produced in residual voltage when road fault occurs, then regard as the biphase phase fault of circuit,
Criterion not as high resistance earthing fault carries out judgement and the computing the resistor value of high resistance earthing fault；
The harmonic frequency produced in residual voltage when utilizing two-phase short circuit and ground fault in distribution system is mainly concentrated
At 4000Hz, harmonic amplitude enters with high resistance earthing fault characteristic harmonics between the fundamental voltage amplitude of 50%～450%
Row is distinguished, and each cycle carries out one-time detection analysis, if harmonic spectrum composition meets two phase ground in circuit
The harmonic characteristic produced in residual voltage during short trouble, then regard as circuit two-phase short circuit and ground fault, no
Criterion as high resistance earthing fault carries out judgement and the computing the resistor value of high resistance earthing fault.
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| DE102016208322B4 (en) | 2016-05-13 | 2020-11-26 | Bender Gmbh & Co. Kg | Method and device for arc fault detection in an ungrounded power supply system |
| CN111308263B (en) * | 2019-12-03 | 2021-08-03 | 昆明理工大学 | High-resistance grounding fault detection method for power distribution network |
| 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 |
| 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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