CN108445347A - A kind of single-phase earth fault detecting method based on line equivalent impedance value - Google Patents

A kind of single-phase earth fault detecting method based on line equivalent impedance value Download PDF

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Publication number
CN108445347A
CN108445347A CN201810404957.0A CN201810404957A CN108445347A CN 108445347 A CN108445347 A CN 108445347A CN 201810404957 A CN201810404957 A CN 201810404957A CN 108445347 A CN108445347 A CN 108445347A
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China
Prior art keywords
value
line
zero
fault
sequence current
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CN201810404957.0A
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Chinese (zh)
Inventor
张勇志
梁国坚
谢幸生
严尹廷
杨晟
李垂有
洪毅文
周桂
张永挺
汤晓晖
蒋炯峰
朱翚
冯灿成
曲骅
陈年蔚
张勇
林永昌
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Guangdong Power Grid Co Ltd
Zhongshan Power Supply Bureau of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Zhongshan Power Supply Bureau of Guangdong Power Grid Co Ltd
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Application filed by Guangdong Power Grid Co Ltd, Zhongshan Power Supply Bureau of Guangdong Power Grid Co Ltd filed Critical Guangdong Power Grid Co Ltd
Priority to CN201810404957.0A priority Critical patent/CN108445347A/en
Publication of CN108445347A publication Critical patent/CN108445347A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/081Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/088Aspects of digital computing

Abstract

The present invention relates to the technical fields of distribution relay protection; more specifically; it is related to a kind of single-phase earth fault detecting method based on line equivalent impedance value; non-fault line is much smaller than as foundation using the ratio between the residual voltage effective value of faulty line and zero-sequence current effective value; by acquiring the residual voltage of busbar and the zero-sequence current of feeder line; the ratio for calculating the residual voltage effective value and zero-sequence current effective value of circuit, judges whether circuit occurs singlephase earth fault further according to the size of this ratio.The present invention can correctly judge faulty line and non-fault line, be influenced by transition resistance smaller, good applicability be all had for linearity failure resistance and nonlinear fault resistance, not by the polarity effect of mutual inductor;Protection can be improved to the single-phase sensitivity through high resistance earthing fault, the security and stability of distribution is improved and reduce the probability of the safety accident caused by high resistance earthing fault.

Description

A kind of single-phase earth fault detecting method based on line equivalent impedance value
Technical field
The present invention relates to the technical fields of distribution relay protection, and line equivalent impedance value is based on more particularly, to one kind Single-phase earth fault detecting method.
Background technology
Compared with isolated neutral mode and through grounding through arc mode, Neutral Point Through Low Resistance mode is more Add suitable for the large- and-medium size cities distribution based on cable run, has and effectively limit various overvoltage and quickly excision The advantages that faulty line, is widely used in the distribution of large- and-medium size cities.Environment residing for distribution network feeder is complicated, single-phase warp High resistance earthing fault occurs often, main cause include overhead transmission line broken string, branch extension touch, insulator or arrester aging And breakdown, cable insulation makes moist, especially bad environments of cable duct, and along with southern rainfall is big, cable insulation Phenomenon make moist frequent occurrence.Meanwhile the overhead transmission line fallen on the ground will produce higher step voltage, the adjoint electric arc of high resistive fault High temperature is will produce, these all will cause huge life threat to the pedestrian of surrounding.
Although the zero-sequence current step protection scheme for being now widely used for small resistance grounding system requires it to single-phase There is certain sensitivity through transition resistance eutral grounding failure, but when due to needing to escape external area error this circuit direct-to-ground capacitance Electric current, protection definite value setting is higher, very low to the sensitivity of high resistance earthing fault, cannot be satisfied the need of high resistance earthing fault It asks;Also there is part substation to use zero-sequence voltage injection scheme, but since the polarity of mutual inductor verifies difficulty, add failure The zero sequence power direction of circuit has only differed 90 degree or so with non-fault line, and larger calculating is easy tod produce when electric current is smaller Error causes to judge by accident.
Invention content
It is connect based on the single-phase of line equivalent impedance value it is an object of the invention to overcome the deficiencies of the prior art and provide a kind of Earth fault detection method is deposited using the ratio between the residual voltage virtual value of faulty line and non-fault line and zero-sequence current virtual value The notable difference the characteristics of, the ratio between residual voltage virtual value and zero-sequence current virtual value of circuit are calculated, and pass through this ratio Size judges whether circuit occurs singlephase earth fault, to improve sensitivity of the protection to high resistance earthing fault.
In order to solve the above technical problems, the technical solution adopted by the present invention is:
A kind of single-phase earth fault detecting method based on line equivalent impedance value is provided, is included the following steps:
S1. it assigns initial value and gives protection act setting valve Zact, zero-sequence current maximum unbalanced value I0.unbAnd residual voltage lower limit Value U0.lim
S2. acquire and calculate the effective value I of feeder line zero-sequence current0And the effective value of bus residual voltage U0
S3. whether multilevel iudge meets I0>I0.unb, if satisfied, then going to step S4;If not satisfied, then return to step S2;
S4. whether multilevel iudge meets U0>U0.lim, if satisfied, then going to step S5;If not satisfied, then return to step S2;
S5. according to formula Z=I0/U0×103Calculate the equivalent admittance value of feeder line;
S6. whether multilevel iudge meets Z<Zact, if satisfied, then going to step S7;If not satisfied, then return to step S2;
S7. high resistance earthing fault alarm or trip signal are sent out.
The single-phase earth fault detecting method based on line equivalent impedance value of the present invention, can be to faulty line and non-event Barrier circuit is correctly judged, is influenced by transition resistance smaller and equal for linearity failure resistance and nonlinear fault resistance With good applicability, not by the polarity effect of mutual inductor.In addition, the present invention only need to be in tradition acquisition zero sequence current signal On the basis of, increase the acquisition and processing of residual voltage signal, is easy to Project Realization.The present invention can improve protection to single-phase through height The sensitivity for hindering earth fault improves the security and stability of distribution and reduces the safety accident caused by high resistance earthing fault Probability.
Preferably, the zero-sequence current maximum unbalanced value I in step S10.unbValue range is 1.2A~2A, residual voltage Lower limiting value U0.limValue range be 55V~65V, the protection act setting valve ZactValue range be 54~60.Zero sequence electricity The maximum unbalanced value I of stream0.unbIt needs to consider the maximum unbalanced value that zero sequence current mutual inductor is likely to occur, includes the injustice of system " drift " degree of weighing apparatus degree and zero sequence transformer itself;Residual voltage lower limiting value U0.limIt needs to consider to be open three when normal operation The maximum value of angle winding voltage;Protection act setting valve ZactIt can be to be grounded the resistance value of low resistance and consider certain reliable system Number is estimated.
Preferably, the zero-sequence current maximum unbalanced value I0.unbValue is 1.4A, residual voltage lower limiting value U0.limTake Value is 58V, the protection act setting valve ZactValue is 60.
Preferably, the protection act setting valve Zact=3Rg×krel, in formula, RgTo be grounded the resistance value of low resistance, krelFor Safety factor, value range are 1.8~2.
Preferably, the zero-sequence current maximum unbalanced value I described in step S10.unbBy formula I0.unb=1/3 (K+ Pasy) A calculating, wherein K is the degree of asymmetry of circuit;PasyFor the degree of asymmetry of system;A is circuit total ground capacitance electric current.
Compared with prior art, the beneficial effects of the invention are as follows:
(1) present invention only need to tradition acquire zero sequence current signal on the basis of, increase residual voltage signal acquisition and Processing, is easy to Project Realization.
(2) present invention is influenced very little by transition resistance, can improve protection to single-phase through the sensitive of high resistance earthing fault Property, to improve the security and stability of distribution and reduce the probability of the safety accident caused by high resistance earthing fault.
(3) present invention can correctly judge faulty line and non-fault line, influenced by transition resistance it is smaller, And good applicability is all had for linearity failure resistance and nonlinear fault resistance, not by the polarity effect of mutual inductor.
Description of the drawings
Fig. 1 is the flow chart of the single-phase earth fault detecting method based on line equivalent impedance value.
Fig. 2 is the primary connection figure of the 10kV small resistance grounding systems of embodiment one.
Protection act situation when Fig. 3 is two circuit head end failure of embodiment.
Protection act situation when Fig. 4 is two circuit midpoint failure of embodiment.
Protection act situation when Fig. 5 is two circuit end fault of embodiment.
Fig. 6 is protection act situation when arc fault occurs for embodiment two.
Specific implementation mode
The present invention is further illustrated With reference to embodiment.Wherein, attached drawing only for illustration, What is indicated is only schematic diagram rather than pictorial diagram, should not be understood as the limitation to this patent;Reality in order to better illustrate the present invention Example is applied, the certain components of attached drawing have omission, zoom in or out, and do not represent the size of actual product;To those skilled in the art For, the omitting of some known structures and their instructions in the attached drawings are understandable.
The same or similar label correspond to the same or similar components in the attached drawing of the embodiment of the present invention;In retouching for the present invention In stating, it is to be understood that if it is based on attached drawing to have the orientation or positional relationship of the instructions such as term "upper", "lower", "left", "right" Shown in orientation or positional relationship, be merely for convenience of description of the present invention and simplification of the description, do not indicate or imply the indicated Device or element must have a particular orientation, with specific azimuth configuration and operation, therefore position relationship described in attached drawing Term only for illustration, should not be understood as the limitation to this patent, for the ordinary skill in the art, can To understand the concrete meaning of above-mentioned term as the case may be.
Embodiment one
It is the first embodiment of the single-phase earth fault detecting method based on line equivalent impedance value as shown in Figure 1, including Following steps:
S1. it assigns initial value and gives protection act setting valve Zact, zero-sequence current maximum unbalanced value I0.unbAnd residual voltage lower limit Value U0.lim
S2. acquire and calculate the effective value I of feeder line zero-sequence current0And the effective value of bus residual voltage U0
S3. whether multilevel iudge meets I0>I0.unb, if satisfied, then going to step S4;If not satisfied, then return to step S2;
S4. whether multilevel iudge meets U0>U0.lim, if satisfied, then going to step S5;If not satisfied, then return to step S2;
S5. according to formula Z=I0/U0×103Calculate the equivalent admittance value of feeder line;
S6. whether multilevel iudge meets Z<Zact, if satisfied, then going to step S7;If not satisfied, then return to step S2;
S7. high resistance earthing fault alarm or trip signal are sent out.
Wherein, protection act setting valve Z in step S1act=3Rg×krel, in formula, RgTo be grounded the resistance value of low resistance, krel For safety factor, value range is 1.8~2;Zero-sequence current maximum unbalanced value I in step S10.unbBy formula I0.unb=1/ 3·(K+Pasy) A calculating, wherein K is the degree of asymmetry of circuit;PasyFor the degree of asymmetry of system;A is that circuit is always electric over the ground Capacitance current.
By above step, the present invention can correctly judge faulty line and non-fault line, by transition resistance Influence it is smaller, and good applicability is all had for linearity failure resistance and nonlinear fault resistance, not by mutual inductor Polarity effect.
Embodiment two
The present embodiment is the Application Example of one the method for embodiment, using 10kV neutral points as low resistance grounding mode Substation is model, as shown in Fig. 2, the zero sequence impedance of the ground connection low resistance of the present embodiment and transformer is 10 Ω, feeder line 1, Feeder line 2, feeder line 3, feeder line 4 length be respectively 6km, 9km, 12km, 15km, each feeder line is all made of cable run, and model is YJV22- 3*300, positive order parameter are:R1=0.500 Ω/km, L1=0.318mH/km, C1=0.376 μ F/km, Zero sequence parameter For:R0=0.500 Ω/km, L0=6.398mH/km, C0=0.370 μ F/km.The load factor of distribution transformer is 60%, and work( Rate factor takes θ=0.9 cos.In the present embodiment, it is respectively provided in the head end of feeder line 3, midpoint and end single-phase through transition electricity Earth fault F is hindered, using the protection act situation of faulty line feeder line 3 and non-fault line feeder line 4 as sample, is implemented to verify The validity of method in example one.The parameter setting of the present embodiment is as follows:
1. zero-sequence current maximum unbalanced value I0.unb:The out-of-balance current of circuit can be calculated according to the following formula:
I0.unb=1/3 (K+Pasy)·A
In formula:K is the degree of asymmetry of circuit;PasyFor the degree of asymmetry of system;A is circuit total ground capacitance electric current.
In view of the maximum degree of asymmetry P of small resistance grounding systemasyIt is 1%, circuit maximum degree of asymmetry K takes 2.5%, According to engineering practices, line mutual-ground capacitor electric current generally takes 2A/km, maximum length 30km, then the out-of-balance current of circuit is 0.7A.And consider the other factors such as zero sequence current mutual inductor " drift ", it is 2 to take safety factor, then zero-sequence current is maximum uneven Value is 1.4A.
2. residual voltage lower limiting value U0.lim:Collection in worksite bus residual voltage generally uses the open delta of voltage transformer Winding, and the unbalance voltage of open-triangular winding is about 174V when normal operation, then residual voltage lower limiting value U0.limIt can be taken as 58V。
3. protection act setting valve Zact:Ground connection low resistance R in present caseg=10 Ω, and consider that safety factor is 1.8 ~2, according to calculation formula
Zact=3Rg×krel
Z can be calculated to obtainactIt can be taken as 54~60.Z in the present embodimentactIt is taken as 60.
When linear resistance failure occurs, transition resistance is respectively set to as 0 Ω, 600 Ω, 1200 Ω and 1500 Ω, Fig. 3 to Fig. 5 is respectively faulty line and non-event when singlephase earth fault is arranged in the head end of faulty line, midpoint and end Hinder zero-sequence current value, residual voltage value, equivalent impedance and the protection act situation of circuit.By Fig. 3 to Fig. 5 it is found that failure The protection of circuit correctly acts, and the protection of non-fault line is failure to actuate, and it is not influenced by abort situation, in this case Tolerable transition resistance value is about 1000 Ω in row;The feelings of faulty line and non-fault line when using fault point as line end Condition is made a concrete analysis of:
1. non-fault line:
The ratio between residual voltage effective value and zero-sequence current effective value of non-fault line are approximately equal to the circuit pair Ground power frequency capacitor value.The direct-to-ground capacitance of feeder line 2 be 0.376 μ F/km, length 9km, then its over the ground power frequency capacitor value be 940.63 Ω, the equivalent impedance that gained is calculated with non-fault line when metallic fault is close, is more than protection act setting valve 60, protection is not Action.And when transition resistance is higher, the zero-sequence current of non-fault line is less than zero-sequence current maximum unbalanced value I0.unb= 1.2A, so protection is failure to actuate.
2. faulty line:
The ratio between residual voltage effective value and zero-sequence current effective value of faulty line are approximately equal to 3 times of small electricity of ground connection Resistance value.In present case, ground connection low resistance resistance value is 10 Ω, i.e. the residual voltage effective value of faulty line and zero-sequence current work The ratio between frequency virtual value is about 30, close with the result 32.57 of emulation gained, is much smaller than protection act setting valve 60, therefore protect Shield acts.And it is 1200 Ω to work as transition resistance, since bus residual voltage is less than residual voltage lower limiting value U0.lim=58V, so Protection is failure to actuate.
When arc fault occurs, arc fault is generally in the form of with linear resistance RfWith a non-linear arc resistance RarcIt is in series.The present embodiment is using fault point as circuit midpoint, linear resistance RfFor 0 Ω and 500 Ω when in case of divided Analysis.When arc fault, zero-sequence current value, residual voltage value, equivalent impedance and the protection of faulty line and non-fault line As shown in fig. 6, it will be appreciated from fig. 6 that in the case where arc fault occurs, the protection of faulty line correctly acts action situation, And the protection of non-fault line is failure to actuate.The residual voltage effective value of faulty line and zero-sequence current effective value it Than being approximately equal to 3 times of ground connection low resistance resistance values, and the residual voltage effective value of non-fault line and zero-sequence current power frequency are effective The ratio between value is approximately equal to the capacitance to earth value of the circuit, this rule is equally set up in arc fault.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this All any modification, equivalent and improvement etc., should be included in the claims in the present invention made by within the spirit and principle of invention Protection domain within.

Claims (9)

1. a kind of single-phase earth fault detecting method based on line equivalent impedance value, which is characterized in that include the following steps:
S1. it assigns initial value and gives protection act setting valve Zact, zero-sequence current maximum unbalanced value I0.unbAnd residual voltage lower limiting value U0.lim
S2. acquire and calculate the effective value I of feeder line zero-sequence current0And the effective value U of bus residual voltage0
S3. whether multilevel iudge meets I0>I0.unb, if satisfied, then going to step S4;If not satisfied, then return to step S2;
S4. whether multilevel iudge meets U0>U0.lim, if satisfied, then going to step S5;If not satisfied, then return to step S2;
S5. according to formula Z=I0/U0×103Calculate the equivalent admittance value of feeder line;
S6. whether multilevel iudge meets Z<Zact, if satisfied, then going to step S7;If not satisfied, then return to step S2;
S7. high resistance earthing fault alarm or trip signal are sent out.
2. the single-phase earth fault detecting method according to claim 1 based on line equivalent impedance value, which is characterized in that Zero-sequence current maximum unbalanced value I in step S10.unbValue range is 1.2A~2A, residual voltage lower limiting value U0.limTake It is worth ranging from 55V~65V, the protection act setting valve ZactValue range be 54~60.
3. the single-phase earth fault detecting method according to claim 2 based on line equivalent impedance value, which is characterized in that The zero-sequence current maximum unbalanced value I0.unbValue is 1.4A, residual voltage lower limiting value U0.limValue be 58V, the guarantor Shield acts setting valve ZactValue is 60.
4. the single-phase earth fault detecting method according to claim 2 based on line equivalent impedance value, which is characterized in that The protection act setting valve Zact=3Rg×krel, in formula, RgTo be grounded the resistance value of low resistance, krelFor safety factor, value model Enclose is 1.8~2.
5. the single-phase earth fault detecting method according to any one of claims 1 to 4 based on line equivalent impedance value, It is characterized in that, the zero-sequence current maximum unbalanced value I described in step S10.unbBy formula I0.unb=1/3 (K+Pasy) A meters It calculates, wherein K is the degree of asymmetry of circuit;PasyFor the degree of asymmetry of system;A is circuit total ground capacitance electric current.
CN201810404957.0A 2018-04-28 2018-04-28 A kind of single-phase earth fault detecting method based on line equivalent impedance value Pending CN108445347A (en)

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CN110988598B (en) * 2019-12-17 2021-01-26 国网河北省电力有限公司 Petal type urban power grid ground fault positioning method based on zero sequence current association
CN111381129A (en) * 2020-03-05 2020-07-07 华中科技大学 Ground fault line and type identification method and device based on ultralow frequency signal
CN111796203A (en) * 2020-06-03 2020-10-20 深圳蓄能发电有限公司 Identification method and device for single-phase earth fault at network bridge side of static frequency converter
CN111796203B (en) * 2020-06-03 2022-08-26 深圳蓄能发电有限公司 Identification method and device for single-phase earth fault at network bridge side of static frequency converter
CN113295970A (en) * 2021-07-01 2021-08-24 国家电网有限公司 Resistive phase detection method for isolating single-phase earth fault on site
CN113514730A (en) * 2021-07-09 2021-10-19 长沙理工大学 Power distribution network high-resistance grounding fault line selection method based on neutral point power frequency zero-sequence current injection

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