CN107611943A - Small resistance grounding system feeder line Adaptive Zero-sequence Current Protection method - Google Patents

Small resistance grounding system feeder line Adaptive Zero-sequence Current Protection method Download PDF

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CN107611943A
CN107611943A CN201710800167.XA CN201710800167A CN107611943A CN 107611943 A CN107611943 A CN 107611943A CN 201710800167 A CN201710800167 A CN 201710800167A CN 107611943 A CN107611943 A CN 107611943A
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zero
sequence current
sequence
feeder line
adaptive
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CN107611943B (en
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曾德辉
王钢
杨伟涛
梁远升
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South China University of Technology SCUT
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Abstract

The invention discloses a kind of small resistance grounding system feeder line Adaptive Zero-sequence Current Protection method, methods described includes fixed value adjusting and Adaptive Zero-sequence Current Protection two parts, when zero-sequence current exceedes the value of fixed value adjusting, starts Adaptive Zero-sequence Current Protection action；The present invention can be in the case where simultaneously phase earth fault of the same name occurs for more loop lines, utilize the positive sequence of fault feeder, negative phase-sequence and zero-sequence current, phase voltage before and after failure, the parameter such as zero-utility theory and zero sequence system impedance, current zero-sequence current is modified to zero-sequence current when singlephase earth fault occurs for single loop line zero load, relay fail problem caused by overcoming in more loop lines while being reduced because of feeder line zero-sequence current when phase earth fault of the same name occurs, influence of the load current to zero-sequence current is reduced to greatest extent simultaneously, it ensure that the sensitivity and reliability of feeder line zero-sequence current protection action.

Description

Small resistance grounding system feeder line Adaptive Zero-sequence Current Protection method
Technical field
The present invention relates to the distribution network system feeder line zero-sequenceprotection field of Neutral Point Through Low Resistance, and in particular to a kind of The small resistance grounding system feeder line Adaptive Zero-sequence Current Protection method of loading effects can be eliminated.
Background technology
Neutral grounding in distribution power network is used as plays act with extremely the key link, the operation to power distribution network in network operation The effect of sufficient weight, it is the synthtic price index for being related to many aspects such as technology, economy and safety.At present, domestic city is matched somebody with somebody Neutral point of electric network is substantially all using low resistance grounding mode and arc-extinguishing system earthing mode.With the quick increasing of power demand Add, power supply reliability requirement constantly increase and land resource it is increasingly rare, large- and-medium size cities power network generally uses underground Cable is as transmission of electricity carrier.Because cable run has larger direct-to-ground capacitance so that the electric capacity electricity of cable-type distribution network system Stream is very big, and built arc suppression coil is difficult to the quick increased compensation capacity demand of reply, the abnormal fortune such as undercompensation easily occurs Row state, or even there are the danger such as resonance overvoltage.Under comparing, because small resistance grounding system can be positioned more accurately Failure and quickly fix a breakdown, be effectively reduced system overvoltage, while also without the complicated device such as failure line selection, because This is used by increasing big and medium-sized cities.
Relative to other earthing modes, small resistance grounding system occurs that larger zero-sequence fault electricity can be produced during earth fault Stream, circuit, which can not work long hours, nonserviceables, therefore small resistance grounding system is to the reliability of feeder line zero-sequence current protection It is it is required that higher.However as the development of urban power distribution network, multiple-loop line makes somebody a mere figurehead line technology and has also obtained increasing application, makes Urban power distribution network is obtained to occur to greatly increase with the probability of female more line downs.When occurring to occur with female more loop line earth faults, Due to being grounded the presence of small resistor, the zero-sequence current on each loop line road can significantly reduce because of shunting, may cause feeder line zero Sequence current protection tripping, or even there are the serious conditions of transform er backup protection malfunction.In addition, single-point, multipoint earth faults Significant difference, and load current be present to influenceing all to give traditional feeder line zero sequence electricity caused by zero-sequence current in fault current characteristics The obstacle for causing to go beyond is adjusted and coordinated in stream protection.If, can be shorter due to distribution network line using distance protection, Branch is more and is difficult to adjust, and is then not suitable for the large-scale application in power distribution network because cost is too high for differential protection.It is comprehensive On, traditional feeder line zero-sequence current protection is difficult to ensure that higher sensitivity and reliability in small resistance grounding system, and away from Power distribution network is not suitable for again from protection and differential protection, therefore needs to be improved for existing feeder line zero-sequence current protection.
Application time of the small resistance grounding system in China is not grown, and still lacks the guiding theory of system, just with female more loop lines Failure and load current solve on influence caused by small resistance grounding system feeder line zero-sequence current protection there is presently no good Method.Therefore need badly and develop a kind of feeder line Adaptive Zero-sequence Current Protection new method for small resistance grounding system, and by examining Consider the current characteristics of 10kV feeder line different combinations failures, propose the adaptive fixed value adjusting method of high fit, it is ensured that feedback The sensitivity and reliability of line Adaptive Zero-sequence Current Protection.
The content of the invention
The purpose of the present invention is to consider the electricity of 10KV feeder line different combinations failures in view of the shortcomings of the prior art Properties of flow, there is provided a kind of small resistance grounding system feeder line Adaptive Zero-sequence Current Protection method for eliminating loading effects, institute Method is stated under conditions of the zero-sequence current for not changing original zero-sequence current protection acts definite value, is solved same with female more loop lines During phase earth fault caused by feeder line zero-sequence current is reduced relay fail problem, while reduce load current to greatest extent Influence to zero-sequence current, the sensitivity and reliability of protection for feed line action are ensure that, be the complicated ground connection of small resistance grounding system Failure provides more effective protection.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of small resistance grounding system feeder line Adaptive Zero-sequence Current Protection method, methods described is including fixed value adjusting and certainly Zero-sequence current protection two parts are adapted to, when zero-sequence current exceedes the value of fixed value adjusting, starts Adaptive Zero-sequence Current Protection and moves Make；
The fixed value adjusting part includes：
1) feeder line Adaptive Zero-sequence Current Protection action definite value I is set0.setDefinite value phase is acted with original zero-sequence current protection Together；
2) the adaptive zero-sequence current of feeder line is set to start definite value according to avoiding single loop line maximum imbalance current setting valve I0.min；
3) set feeder line Adaptive Zero-sequence Current Protection time definite value identical with original zero-sequence current protection time definite value；
4) below equation computing system comprehensive impedance definite value Z is usedSΣ：
ZS∑=2ZS+ZT0+3R0
In formula, ZSFor the positive sequence impedance (generally negligible) of 10kV systems, ZT0For Zero-sequence Impedance for Earthing Transformer, R0 For neutral ground small resistor；
5) zero-utility theory k is calculated using below equation0：
In formula, ZL0nFor the zero sequence impedance of feeder line unit length, ZL1nFor circuit unit length positive sequence impedance；
The realization of the Adaptive Zero-sequence Current Protection part comprises the following steps：
It is electric on S1, protective relaying device；
S2, read feeder line Adaptive Zero-sequence Current Protection action definite value I0.set, the adaptive zero-sequence current of feeder line start definite value I0.min, system comprehensive impedance definite value ZSΣAnd zero-utility theory k0；
S3, circulation are measured and are calculated feeder line zero-sequence current amplitudeAnd Sudden Changing Rate | d (3I0) |, if feeder line zero-sequence current AmplitudeMeetOr Sudden Changing Rate | d (3I0) | meet | d (3I0)|>0.2A, then into step S4；
S4, judge earth fault, delay counter T occursLReset, record first three phase voltage of failure UA·n、UB·nAnd UC·n；
S5, measurement simultaneously calculate feeder fault forward-order currentNegative-sequence currentAnd zero-sequence currentAnd feeder fault three Phase voltage UA·f、UB·fAnd UC·f；
If S6, meet feeder fault zero-sequence current amplitudeThen enter step S7, otherwise return to step S3；
S7, compare feeder fault three-phase voltage UA·f、UB·fAnd UC·fAmplitude, judge amplitude it is minimum for failure phase, profit Zero-sequence current correction value is calculated with below equation
In formula,For voltage before the failure of failure phase,For faulted phase voltage；IfThen continue, it is no Then return to step S3；
Delay counter TLIt is cumulative, when reaching setting value TL.set, then protection act excision faulty line, otherwise return to step S5。
Further, methods described is applied to more loop lines and the situation of singlephase earth fault occurs simultaneously, when more loop lines simultaneously During generation double earthfault, this method will be modified to zero-sequence current zero sequence electricity during single loop line generation singlephase earth fault Stream, so that zero-sequence current correction value is bigger than normal.
Further, when simultaneously singlephase earth fault occurs for more loop lines, zero-sequence current will be modified to zero load by this method When zero-sequence current when occurring singlephase earth fault of list loop line, rather than zero when singlephase earth fault occurs for current loads list loop line Sequence electric current.
The present invention compared with prior art, has the following advantages that and beneficial effect：
The present invention occurs single-phase with famous prime minister simultaneously on the basis of original zero-sequence current action definite value is kept in more loop lines Earth fault and it is load-carrying in the case of, using the positive sequence, negative phase-sequence and zero-sequence current of faulty line, phase voltage before and after failure, The parameter such as zero-utility theory and zero sequence system impedance, current zero-sequence current is modified to single loop line zero load single-phase connect occurs Zero-sequence current during earth fault, overcome more loop lines and meanwhile occur with famous prime minister's singlephase earth fault when because feeder line zero-sequence current subtracts Relay fail problem caused by less, while influence of the load current to zero-sequence current is reduced to greatest extent, it ensure that feedback The sensitivity and reliability of line zero-sequence current protection action, so as to be provided effectively for the various earth faults of small resistance grounding system Protection；And present invention introduces line current, the metrical information such as busbar voltage be existing information for protection for feed line, Er Qieyuan The action definite value of some zero-sequence current protections stands good, therefore simple and reliable, is easy to Project Realization.
Brief description of the drawings
Fig. 1 is a kind of flow of small resistance grounding system feeder line Adaptive Zero-sequence Current Protection method of the embodiment of the present invention Figure.
Fig. 2 is the 10kV small resistance grounding system primary connection figures of the embodiment of the present invention.
Embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are unlimited In this.
Embodiment：
A kind of small resistance grounding system feeder line Adaptive Zero-sequence Current Protection method is present embodiments provided, methods described Flow chart is as shown in figure 1, including fixed value adjusting and Adaptive Zero-sequence Current Protection two parts, when zero-sequence current exceedes fixed value adjusting Value when, start Adaptive Zero-sequence Current Protection action；
The fixed value adjusting part includes：
1) feeder line Adaptive Zero-sequence Current Protection action definite value I is set0.setDefinite value phase is acted with original zero-sequence current protection Together；
2) the adaptive zero-sequence current of feeder line is set to start definite value according to avoiding single loop line maximum imbalance current setting valve I0.min；
3) set feeder line Adaptive Zero-sequence Current Protection time definite value identical with original zero-sequence current protection time definite value；
4) below equation computing system comprehensive impedance definite value Z is usedSΣ：
ZS∑=2ZS+ZT0+3R0
In formula, ZSFor the positive sequence impedance (generally negligible) of 10kV systems, ZT0For Zero-sequence Impedance for Earthing Transformer, R0 For neutral ground small resistor；
5) zero-utility theory k is calculated using below equation0：
In formula, ZL0nFor the zero sequence impedance of feeder line unit length, ZL1nFor circuit unit length positive sequence impedance；
The realization of the Adaptive Zero-sequence Current Protection part comprises the following steps：
It is electric on S1, protective relaying device；
S2, read feeder line Adaptive Zero-sequence Current Protection action definite value I0.set, the adaptive zero-sequence current of feeder line start definite value I0.min, system comprehensive impedance definite value ZSΣAnd zero-utility theory k0；
S3, circulation are measured and are calculated feeder line zero-sequence current amplitudeAnd Sudden Changing Rate | d (3I0) |, if feeder line zero-sequence current AmplitudeMeetOr Sudden Changing Rate | d (3I0) | meet | d (3I0)|>0.2A, then into step S4；
S4, judge earth fault, delay counter T occursLReset, record first three phase voltage of failure UA·n、UB·nAnd UC·n；
S5, measurement simultaneously calculate feeder fault forward-order currentNegative-sequence currentAnd zero-sequence currentAnd feeder fault three Phase voltage UA·f、UB·fAnd UC·f；
If S6, meet feeder fault zero-sequence current amplitudeThen enter step S7, otherwise return to step S3；
S7, compare feeder fault three-phase voltage UA·f、UB·fAnd UC·fAmplitude, judge amplitude it is minimum for failure phase, profit Zero-sequence current correction value is calculated with below equation
In formula,For voltage before the failure of failure phase,For faulted phase voltage；IfThen continue, it is no Then return to step S3；
Delay counter TLIt is cumulative, when reaching setting value TL.set, then protection act excision faulty line, otherwise return to step S5。
Using the data of the transformer station of 10KV low resistance groundings as model, 10KV small resistance grounding system primary connections figure is as schemed Shown in 2, system impedance Zs=j0.5 Ω；Ground connection becomes zero sequence impedance ZT0=j12 Ω, ground connection small resistor R0=12 Ω.Feeder line L1, L2 Length with L3 is respectively 8.1km, 6.1km and 7.6km, and all for LGJ-185, positive order parameter is the circuit model that feeder line uses： R1=0.13 Ω/km, X1=0.356 Ω/km, Zero sequence parameter are：R1=0.39 Ω/km, X1=1.068 Ω/km.Three-line Operation total capacity be respectively 9.16MVA, 4.01MVA and 6.10MVA, and power factor is cos θ=0.85.
In the present embodiment, single loop line and two loop line A phase metallicity are respectively provided with feeder line L1 and L2 3km and 6km Earth fault, the protection act situation of faulty line is examined, to verify effectiveness of the invention.The feeder line of the transformer station only sets one Section acts the zero-sequencedirectional protection in tripping operation, and original zero-sequence current protection definite value is 4A, and the no-load voltage ratio of ZCT is 50:5. The definite value of adaptive zero-sequencedirectional protection is still I in the present embodiment0.set=4A, feeder line zero-sequence current start definite value I0.min=1A, System comprehensive impedance definite value ZSΣ=(12+j13) Ω and zero-utility theory k0=0.667.
Table 1
Zero sequence current measurement value and amendment when table 1 is feeder line L1 generations A phase metallic earthing failures under different loads rate Value, when being broken down using load factor as 90%, 6km, is analyzed exemplified by feeder line L1 adaptive zero-sequencedirectional protection：
A) measure and calculate when single phase metal earth fault occurs, the zero sequence current measurement value for protecting installation place is
B) meet to judgeMask register starts timing, and faulty line is cut off after reaching setting value.
It can be seen that by the protection act process analysis to table 1 and feeder line L1：When single loop line list occurs in this circuit During phase metallic earthing failure, zero sequence current measurement value meetsActed after directly entering line delay, so can be Zero-sequence current amendment link is needed not move through in the case that single line down, zero-sequence current are larger, ensure that zero-sequence current protection Fast and reliable action；And can be found by the zero sequence current measurement value in table 1, influence of the load to zero sequence current measurement value compared with Greatly.In addition in order to verify the validity of the zero-sequence current correction algorithm of the invention put forward, zero-sequence current amendment is also recorded in table 1 Value, it can find that institute's extracting method of the present invention can subtract effectively compared with the zero sequence current measurement value of generation singlephase earth fault when zero load Few influence of the load current to zero-sequence current.
Table 2
Table 2 is that simultaneously faulty line zero-sequence current during A phase earth faults occurs for feeder line L1 and feeder line L2 under different loads rate Measured value and correction value, when being broken down using load factor as 90%, 6km, divide exemplified by feeder line L1 adaptive zero-sequencedirectional protection Analysis：
A) measure and calculate the zero sequence current measurement for when the single-phase resistance eutral grounding failure through transition occurs, protecting installation place It is worth and is
B) it is unsatisfactory for judgingIt is mutually A phases by the amplitude features failure for comparing three-phase voltage, utilizes following formula Calculate zero-sequence current correction value
C) meet to judgeWithDelay register starts timing, and event is cut off after reaching setting value Hinder circuit.
It can be seen that by the protection act process analysis to table 2 and feeder line L1：It is of the same name when occurring on two loop line roads simultaneously During phase metallic earthing failure, diminish when the zero-sequence current of L1 circuits is compared to single line down, zero sequence current measurement value is discontented with FootRevised zero-sequence current is close to single line down zero-sequence current during the zero load of this circuit, by payload Influence it is smaller, protection can correctly act, successfully reduce the possibility of zero-sequence current protection tripping.And zero sequence electricity List line down zero-sequence current when flowing correction value no more than the zero load of this circuit, avoid the possibility of malfunction.
Theory and practice shows：The Adaptive Zero-sequence Current Protection method carried in the present embodiment is able to ensure that small in 10KV Action message during phase earth fault of the same name with the more loop lines of mother occurs in resistance grounded system in the case of different loads rate, and not It can malfunction, improve the sensitivity of protection.
It is described above, patent preferred embodiment only of the present invention, but the protection domain of patent of the present invention is not limited to This, any one skilled in the art is in the scope disclosed in patent of the present invention, according to the skill of patent of the present invention Art scheme and its patent of invention design are subject to equivalent substitution or change, belong to the protection domain of patent of the present invention.

Claims (3)

  1. A kind of 1. small resistance grounding system feeder line Adaptive Zero-sequence Current Protection method, it is characterised in that：Methods described includes fixed Value adjust with Adaptive Zero-sequence Current Protection two parts, when zero-sequence current exceed fixed value adjusting value when, start adaptive zero sequence Current protection acts；
    The fixed value adjusting part includes：
    1) feeder line Adaptive Zero-sequence Current Protection action definite value I is set0.setIt is identical with original zero-sequence current protection action definite value；
    2) the adaptive zero-sequence current of feeder line is set to start definite value I according to avoiding single loop line maximum imbalance current setting valve0.min；
    3) set feeder line Adaptive Zero-sequence Current Protection time definite value identical with original zero-sequence current protection time definite value；
    4) below equation computing system comprehensive impedance definite value Z is usedSΣ：
    ZS∑=2ZS+ZT0+3R0
    In formula, ZSFor the positive sequence impedance of 10kV systems, ZT0For Zero-sequence Impedance for Earthing Transformer, R0For neutral ground small resistor；
    5) zero-utility theory k is calculated using below equation0：
    <mrow> <msub> <mi>k</mi> <mn>0</mn> </msub> <mo>=</mo> <mfrac> <mrow> <msub> <mi>Z</mi> <mrow> <mi>L</mi> <mn>0</mn> <mi>n</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>Z</mi> <mrow> <mi>L</mi> <mn>1</mn> <mi>n</mi> </mrow> </msub> </mrow> <mrow> <mn>3</mn> <msub> <mi>Z</mi> <mrow> <mi>L</mi> <mn>1</mn> <mi>n</mi> </mrow> </msub> </mrow> </mfrac> </mrow>
    In formula, ZL0nFor the zero sequence impedance of feeder line unit length, ZL1nFor circuit unit length positive sequence impedance；
    The realization of the Adaptive Zero-sequence Current Protection part comprises the following steps：
    It is electric on S1, protective relaying device；
    S2, read feeder line Adaptive Zero-sequence Current Protection action definite value I0.set, the adaptive zero-sequence current of feeder line start definite value I0.min、 System comprehensive impedance definite value ZSΣAnd zero-utility theory k0；
    S3, circulation are measured and are calculated feeder line zero-sequence current amplitudeAnd Sudden Changing Rate | d (3I0) |, if feeder line zero-sequence current amplitudeMeetOr Sudden Changing Rate | d (3I0) | meet | d (3I0)|>0.2A, then into step S4；
    S4, judge earth fault, delay counter T occursLReset, record first three phase voltage of failure UA·n、UB·nAnd UC·n；
    S5, measurement simultaneously calculate feeder fault forward-order currentNegative-sequence currentAnd zero-sequence currentAnd feeder fault three-phase electricity Press UA·f、UB·fAnd UC·f；
    If S6, meet feeder fault zero-sequence current amplitudeThen enter step S7, otherwise return to step S3；
    S7, compare feeder fault three-phase voltage UA·f、UB·fAnd UC·fAmplitude, judge amplitude it is minimum for failure phase, utilize with Lower formula calculates zero-sequence current correction value
    In formula,For voltage before the failure of failure phase,For faulted phase voltage；IfThen continue, otherwise return Step S3；
    Delay counter TLIt is cumulative, when reaching setting value TL.set, then protection act excision faulty line, otherwise return to step S5.
  2. 2. a kind of small resistance grounding system feeder line Adaptive Zero-sequence Current Protection method according to claim 1, its feature It is：Methods described is applied to the situation that singlephase earth fault occurs simultaneously for more loop lines, when simultaneously two phase ground occurs for more loop lines During failure, this method will be modified to zero-sequence current zero-sequence current during single loop line generation singlephase earth fault, so that zero Sequence electric current correction value is bigger than normal.
  3. 3. a kind of small resistance grounding system feeder line Adaptive Zero-sequence Current Protection method according to claim 1, its feature It is：When simultaneously singlephase earth fault occurs for more loop lines, list loop line occurs when this method will be modified to zero-sequence current zero load Zero-sequence current during singlephase earth fault, rather than zero-sequence current during current loads list loop line generation singlephase earth fault.
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CN108776284A (en) * 2018-03-29 2018-11-09 广东电网有限责任公司惠州供电局 A kind of small resistance grounding system single phase earthing protection method compared based on zero-sequence current
CN109103852A (en) * 2018-03-19 2018-12-28 中国石油大学(华东) A kind of small resistance grounding system single phase earthing protection new method compared based on zero-sequence current
CN109510166A (en) * 2018-12-29 2019-03-22 徐州中矿大传动与自动化有限公司 A kind of power system in mines electric shock detection and prevention and control device and method
CN109669096A (en) * 2019-01-24 2019-04-23 济南大学 The single loop line method for locating single-phase ground fault of double circuits on same tower transmission line of electricity
CN111799764A (en) * 2020-07-08 2020-10-20 国网江苏省电力有限公司无锡供电分公司 Method, device and system for preventing zero sequence protection of homonymous single-phase fault from being refused
CN112531659A (en) * 2020-12-09 2021-03-19 广东电网有限责任公司江门供电局 Protection method for power distribution zero sequence current constant value self-optimization
CN113361221A (en) * 2021-06-22 2021-09-07 广东电网有限责任公司 Two-point in-phase grounding fault analysis method and related device for small-resistance grounding system
CN113541109A (en) * 2021-07-02 2021-10-22 国网浙江省电力有限公司金华供电公司 Feeder fault processing system and method based on power wireless private network
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CN108321780A (en) * 2018-03-19 2018-07-24 中国石油大学(华东) It is a kind of to protect the small resistance grounding system inverse time lag zero sequence excess current earthing protecting method laterally coordinated based on each outlet
CN109103852A (en) * 2018-03-19 2018-12-28 中国石油大学(华东) A kind of small resistance grounding system single phase earthing protection new method compared based on zero-sequence current
CN108776284A (en) * 2018-03-29 2018-11-09 广东电网有限责任公司惠州供电局 A kind of small resistance grounding system single phase earthing protection method compared based on zero-sequence current
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CN108445347A (en) * 2018-04-28 2018-08-24 广东电网有限责任公司 A kind of single-phase earth fault detecting method based on line equivalent impedance value
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