CN104578008B - A kind of zero-sequence direction component faulty action preventing method - Google Patents
A kind of zero-sequence direction component faulty action preventing method Download PDFInfo
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Abstract
The present invention discloses a kind of zero-sequence direction component faulty action preventing method, comprises the following steps：(1) phase current of route protection installation place is obtained；(2) fault component of phase current is extracted；(3) according to the starting criteria of faulty action preventing algorithm, judge whether to start faulty action preventing algorithm.If started, into (4)；(4) similarity of relatively more each phase fault current weight waveform；(5) selected according to similarity-rough set result and perfect circuit.If three-phase fault current weight waveform is essentially identical, i.e., similarity is higher, judges this circuit to perfect circuit, and give locking to zero-sequence direction component；If three-phase fault current weight waveform difference is larger, i.e., similarity is relatively low, then judges that this circuit, as faulty line, locking is refused to zero-sequence direction component.The present invention is recognizable to perfect circuit and faulty line merely with this line one-terminal current, it is to avoid the generation due to perfecting circuit zero-sequence direction component maloperation caused by mutual inductance between line, effectively improves the performance of zero-sequence direction component.
Description
【Technical field】
The present invention relates to power system transmission line relay protection field, more particularly to a kind of zero-sequence direction component faulty action preventing
Method.
【Background technology】
Multi-circuit lines on the same tower is using commonplace, especially in economically developed and densely populated Japan and Some European country
Using more.It is effectively to utilize line corridor in Germany, the necessary wiring on the same tower of all newly-built circuits of statutory regulation more than twice.
In its high pressure and supertension line, with tower, four times are conventional line, up to six times.Tokyo Electric Power is because of area under one's jurisdiction soil
Resource is nervous, to reduce line corridor land used, as far as possible using multiloop parallel erected on same tower.110kV and the circuit of above majority are same
Tower four times, 500kV circuits except early stage 2 be single loop in addition to, remaining is same pylon double back.At present, Japanese parallel erected on same tower is most
Feeder number is eight times.In recent years, with the quickening of power grid construction speed, Beijing that Economic contrast is flourishing, planning facility is intensive,
The multi-circuit lines on the same tower application of the area such as Guangdong is also commonplace, and by the research and application of more than ten years, parallel erected on same tower there has been length
The development of foot, is increasingly becoming a ripe technology.Domestic first is built in nineteen ninety-five with the loop line road of tower 4, is that Beijing area is known
In spring -220kV, the 110kV in Qinghe be with tower circuit.The circuit employs self-supporting drum type tower, and each loop three-phase conducting wire is using vertical
In line row, totally seven layers of cross-arm.Upper strata is lightning-arrest line bracket, and middle three layers are 220kV wire cross-arms, below three layers led for 110kV
Line cross-arm.In order to limit wire windage yaw, design span is no more than 300m.In order to improve stability, control tower overall height is left in 50m
It is right.Ankang-southern suburbs (Xi'an) line is the parallel erected on same tower double-circuit line of the domestic 330kV voltage class built earliest, is safe and comfortable electricity
Factory uniquely sends out basic routing line, is the important channel of the safe and comfortable power plant of connection and Shaanxi Power System.It is extensive due to multi-circuit lines on the same tower
Using its Related Technical Issues research is one of hot research direction of power system.
For fault signature, the main distinction of the multi-circuit lines on the same tower compared with common single back line is it by adjacent lines
Influence.For there is the method for operation of circuit contact, fault signature not only needs to consider the play of adjacent lines correspondence phase electrical quantity
Strong change, in addition it is also necessary to consider the influence of mutual inductance between different loop lines.For the method for operation contacted in the absence of circuit, then fault signature
Only need to consider the influence of mutual inductance between different loop lines.Perfecting the electrical quantity change that circuit occurs in failure makes it there is malfunction wind
The malfunction problem of adjacent lines zero-sequence direction component is of common occurrence in each voltage class power network in the case of danger, and single line down, past
It is past to cause the misoperation of zero-sequence voltage injection.For long range with the corridor construction of line, because mutual inductance is acted between line, zero sequence side
Malfunction problem is equally existed to protection.
To sum up analyze, for the multi-circuit lines on the same tower with the strong magnetic contact of light current and over long distances with the corridor construction of line, zero
Although there is the selectivity and sensitivity problem of faulty line protection in sequence direction protection, but perfect the malfunction problem of route protection also
It is very prominent, it should to cause enough attention.
【The content of the invention】
It is an object of the invention to provide a kind of zero-sequence direction component faulty action preventing method, to solve to perfect line caused by mutual inductance
Road zero-sequence voltage injection misoperation problem.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of zero-sequence direction component faulty action preventing method, comprises the following steps：
(1) phase current of route protection installation place is obtained；
(2) fault component of phase current is extracted；
(3) according to the starting criteria of faulty action preventing algorithm, judge whether to start faulty action preventing algorithm；If started, into step
(4)；
(4) similarity of each phase fault current weight waveform in each circuit is compared；Selected according to similarity-rough set result strong
Full line, and give its zero-sequence direction component locking, the zero-sequence direction component of faulty line then refuses locking.
By calculating the model error faults current weight ripple of three-phase fault current weight between any two in step (4)
Similarity between shape, and using any two tectonic model error criterion in three model errors；If the two of a certain circuit
Individual model error value is respectively less than setting valve, judges this circuit to perfect circuit, and give locking to zero-sequence direction component；If a certain
Two model error values of circuit are not both less than setting valve, then judge that this circuit, as faulty line, is refused zero-sequence direction component
Locking.
The starting criteria of faulty action preventing algorithm is in step (3)：
IsetValue is 0.2 times of zero-sequence direction component starting current setting valve.
The model error of three-phase fault current weight between any two is in step (4)：
Wherein, Δ iαWith Δ iβFor two in A, B, C three-phase fault current weight.
Step (4) if in selection calculate model error between A, B two-phase and B, C phase to phase fault current weight, model
Error criterion is：
r(Δia,Δib)<rsetAnd r (Δ ib,Δic)<rset
Wherein, rsetAny number in the range of (0,0.8) can be taken.To ensure the reliability of criterion, rsetIt can be taken as
0.4。
Present invention solves the technical problem that having：1st, when a loop line breaks down in the case of the strong magnetic of light current, faulty line and strong
The fault signature essential difference of full line；2nd, to faulty line and description and the identification side of line fault feature essential difference are perfected
Method；3rd, circuit zero-sequence direction component locking measure is perfected.
The present invention key technology be：(1) when a loop line breaks down in the case of the strong magnetic of light current, circuit and fault wire are perfected
The electric characteristic essential difference on road；(2) reliable recognition of circuit is perfected.
Compared with existing zero-sequence direction component faulty action preventing method, the present invention has three below advantage：
1st, it can carry out perfecting circuit merely with this line one-terminal current information and faulty line is recognized, be conducive to preventing between line
Perfect circuit zero-sequence direction component malfunction caused by mutual inductance；
2nd, the calculating of model error criterion is carried out in time domain, and amount of calculation is small, and data window is short, and distinguishing speed is fast；
3rd, while being applied to unsymmetrical short-circuit and disconnection fault, and with higher sensitivity.
The present invention provides a kind of zero-sequence direction component faulty action preventing method, it is ensured that zero-sequence direction component is in line fault
Precision maneuver, it is to avoid perfect the misoperation of circuit zero-sequence voltage injection.For the multi-circuit lines on the same tower with the strong magnetic contact of light current
Or over long distances with the corridor construction of line, in the case of various transpositions, the average mutual impedance coefficient very little of positive-negative sequence between loop line,
It is negligible, and zero-sequence mutual inductance is still very big.Therefore, when unsymmetrical short-circuit or disconnection fault occur for a loop line, perfect
The phase current change of circuit is only caused by zero-sequence mutual inductance, it is characterized in that three-phase current is with mutation；And the phase current of faulty line becomes
Change is mainly caused by this line failure, simultaneously containing positive sequence, negative phase-sequence and zero-sequence component, it is characterized in that three-phase current difference mutation.According to
This can go out to perfect circuit using the similarity identification of three-phase fault current weight waveform, and locking its zero-sequence direction component, from
And ensure the reliable selection sexual act of relay protection.
【Brief description of the drawings】
Fig. 1 is the single line structure chart of common-tower double-return line.
Zero mould network during disconnection fault occurs for a loop line in common-tower double-return line for Fig. 2.
Fig. 3 perfects the zero sequence at circuit and faulty line two ends when occurring single-phase wire break failure for a loop line in common-tower double-return line
The waveform of voltage, current waveform and residual voltage and current and phase difference；Wherein Fig. 3 (a), Fig. 3 (b) are the ripple for perfecting circuit two ends
Shape, Fig. 3 (c), Fig. 3 (d) are the waveform at faulty line two ends.Define and the pros that generatrix direction is zero-sequence current are flowed to by circuit
To.In order to compare the phase relation of residual voltage and electric current, the amplitude of residual voltage standardization processing has been subjected to.
Fig. 4 perfects the zero sequence at circuit and faulty line two ends when occurring singlephase earth fault for a loop line in common-tower double-return line
The waveform of voltage, current waveform and residual voltage and current and phase difference, wherein Fig. 4 (a), Fig. 4 (b) are the ripple for perfecting circuit two ends
Shape, Fig. 4 (c), Fig. 4 (d) are the waveform at faulty line two ends.
Fig. 5 perfects the model at circuit and faulty line two ends when occurring A phase disconnection faults for a loop line in common-tower double-return line
Error waveform, wherein Fig. 5 (a), Fig. 5 (b) are the model error waveform for perfecting circuit two ends, and Fig. 5 (c), Fig. 5 (d) are fault wire
The model error waveform at road two ends.
Fig. 6 perfects the model at circuit and faulty line two ends when occurring A phase earth faults for a loop line in common-tower double-return line
Error waveform, wherein Fig. 6 (a), Fig. 6 (b) are the model error waveform for perfecting circuit two ends, and Fig. 6 (c), Fig. 6 (d) are fault wire
The model error waveform at road two ends.
【Embodiment】
The invention will be further described below in conjunction with the accompanying drawings.
The present invention provides a kind of zero-sequence direction component faulty action preventing method, and its main purpose is to solve traditional zero-sequence voltage injection
Misoperation problem.Identify first after a failure and perfect circuit simultaneously its zero-sequence direction component of locking, prevent from perfecting circuit zero sequence
The generation of direction protection misoperation.
The present invention general principle be：For the multi-circuit lines on the same tower with the strong magnetic contact of light current or the same corridor of long range
The construction of line, wherein a loop line occurs after unsymmetrical short-circuit or disconnection fault, the phase current for perfecting circuit changes by fault wire
The zero-sequence mutual inductance on road causes, so showing fault signature of the three-phase current with mutation；The phase current change of faulty line is main
Caused by failure, fault component electric current not only includes zero-sequence component, also containing positive sequence and negative sequence component, so showing three-phase electricity
Flow the fault signature of different mutation.Based on this fault signature difference, it is possible to use the similarity of three-phase fault current weight waveform
Identify and perfect circuit, and locking its zero-sequence direction component.
The zero-sequence voltage injection for perfecting circuit occurs in the case of misoperation only occurs in " the strong magnetic of light current ".For shown in Fig. 1
Multiple-circuit on same tower of the two ends without electrical link, when single-phase wire break failure occurs for loop line I, by zero-sequence network figure (Fig. 2) and
The phase relation of residual voltage current waveform (Fig. 3) understands that the correct failure judgement of zero-sequence voltage injection of faulty line occurs
In area, and the zero-sequence voltage injection for perfecting circuit then judges failure by accident for troubles inside the sample space, so as to cause misoperation.When loop line I occurs
During singlephase earth fault, it equally may determine that the zero-sequence voltage injection for perfecting circuit can misoperation by Fig. 4.Perfect circuit zero sequence
The basic reason of direction protection misoperation is the zero-sequence mutual inductance effect between loop line.In the presence of zero-sequence mutual inductance, perfect circuit
Three-phase current show the fault signature of identical mutation, and the three-phase current of fault wire is acted on by the zero-sequence mutual inductance for perfecting circuit
Smaller, fault signature is identical with the case of single loop line, without feature of the three-phase current with mutation.According to the difference of fault signature
It is different, it is possible to use the similarity identification of three-phase fault current weight waveform, which goes out, perfects circuit, and locking its zero-sequence direction component, from
And prevent zero-sequence voltage injection misoperation.
The principle of Model Identification：
The method of Model Identification has been successfully applied to relay protection field, its basic ideas be first to Nei He areas of area outside
The network of failure carries out Equivalent Modeling, then distinguishes event outside Nei He areas of area according to the matching degree of two kinds of models and actual measurement electrical quantity
Barrier.Specifically method of discrimination is generally realized by model error, model, the formula of model error on the basis of choosing in area or outside area
It is as follows：
Wherein, f is the electrical quantity of model on the basis of the electrical quantity of actual measurement, g.
For multi-circuit lines on the same tower or over long distances with the corridor construction of line, it is possible to use perfect circuit and faulty line three
The difference of phase fault current weight wave-form similarity, builds the equivalent model for perfecting circuit and faulty line.For perfecting circuit,
Equivalent model is that three-phase fault current weight waveform is essentially identical, i.e. the higher model of similarity；For faulty line, equivalent mould
Type is that three-phase fault current weight waveform differs larger, i.e. the relatively low model of similarity.Thus, it is possible to which tectonic model error is carried out
Perfect the differentiation of circuit.With A, exemplified by B phase fault current weights, the formula of model error is as follows：
Wherein, N is per cycle sampling number.
It is 0 for perfecting the model error between circuit, three-phase fault current weight；And for faulty line, three-phase
Model error between fault component electric current is not all 0.
The present invention provides a kind of zero-sequence direction component faulty action preventing method, specifically includes following steps：
(1) three-phase voltage and electric current of route protection installation place are acquired, and carry out A/D conversions, obtain three-phase electricity
The digital quantity of pressure and electric current.
(2) three-phase voltage and the electrical quantity of electric current that the initiating element of protective relaying device is obtained according to step (1) judge
Whether starting failure decision logic.If started, into step (3).
(3) fault component of phase current is extracted, the power frequency composition of fault component also can be only extracted.
(4) according to the starting criteria of faulty action preventing algorithm, judge whether to start faulty action preventing algorithm.If started, into step
(5)。
The starting criteria of faulty action preventing algorithm is：
IsetValue is 0.2 times of zero-sequence direction component starting current setting valve.
(5) model error between three-phase fault current weight is calculated.
So that A phase earth faults occur for a loop line as an example, the three-phase fault current weight relation of fault wire is as follows
Wherein, C1、C0For positive sequence and zero sequence diverting coefficient,For the zero-sequence current of trouble point.
Usual C1And C0Numerical value is suitable, so when occurring A phase earth faults, the fault component electric current of B, C phase is much smaller than A phases
Fault component electric current.Therefore, calculating obtained model error is：
The three-phase fault current weight for perfecting circuit meets following relation:
Calculating obtains model error：
Faulty line can be dependably distinguished from according to the model error result of calculation of formula (4) and formula (6) and perfect line
Road.
(6) selected according to model error result of calculation and perfect line, and locking is given to the zero-sequence direction component for perfecting circuit,
The zero-sequence direction component of faulty line refuses locking.
According to actual derivation of equation result, in the case of various unsymmetrical short-circuits and disconnection fault, perfect the event of circuit three-phase
The model error value hindered between current weight is 0, and the model error between fault wire three-phase fault current weight is at least
Two values are close to 1.It therefore, it can only calculate the identification that any two model error perfect circuit.
If selection calculates the model error between A, B two-phase and B, C phase to phase fault current weight, model error criterion
For：
r(Δia,Δib)<rsetAnd r (Δ ib,Δic)<rset
For actual multi-circuit lines on the same tower or over long distances with the corridor construction of line, to ensure the reliability of criterion, rset
0.4 can be taken.
It is the particular content of the present invention above.
When for a loop line in common-tower double-return line single-phase wire break failure occurs for Fig. 3, perfect the zero of circuit and faulty line two ends
The waveform of sequence voltage, current waveform and residual voltage and current and phase difference.It can be seen that perfecting circuit and faulty line
The residual voltage and current phase relation at two ends meet about 90 degree of residual voltage leading current, so that circuit two ends zero sequence direction is first
The positive direction criterion of part is set up.So, the zero-sequence voltage injection of faulty line reliably Judging fault can occur in area, and be good for
The zero-sequence voltage injection erroneous judgement failure of full line occurs in area, so as to misoperation occur.
When for a loop line in common-tower double-return line singlephase earth fault occurs for Fig. 4, perfect the zero of circuit and faulty line two ends
The waveform of sequence voltage, current waveform and residual voltage and current and phase difference.It can be seen that perfecting circuit and faulty line
The residual voltage and current phase relation at two ends meet about 90 degree of residual voltage leading current, so that circuit two ends zero sequence direction is first
The positive direction criterion of part is set up.So, the zero-sequence voltage injection of faulty line reliably Judging fault can occur in area, and be good for
The zero-sequence voltage injection erroneous judgement failure of full line occurs in area, so as to misoperation occur.
When for a loop line in common-tower double-return line A phase disconnection faults occur for Fig. 5, perfect the model at circuit and faulty line two ends
Error waveform.It can be seen that the model error value for perfecting circuit two ends is 0, much smaller than setting valve 0.4, model is missed
Poor criterion is set up；The model error value at faulty line two ends is about 1 and 0, and model error criterion is invalid.Therefore, use this sentence
Perfect circuit according to can reliably select.
When for a loop line in common-tower double-return line A phase earth faults occur for Fig. 6, perfect the model at circuit and faulty line two ends
Error waveform.It can be seen that the model error value for perfecting circuit two ends is 0, much smaller than setting valve 0.4, model is missed
Poor criterion is set up；The model error value at fault wire two ends is about 1 and 0, and model error criterion is invalid.Therefore, using the criterion
It can reliably select and perfect circuit.
In summary analyze, when asymmetric earth fault and disconnection fault occur for a loop line in common-tower double-return line, perfect line
The zero-sequence direction component on road can judge fault direction by accident.It can reliably be selected using model error criterion and perfect circuit, so as to prevent from being good for
The misoperation of full line zero-sequence voltage injection.For the multi-circuit lines on the same tower with the strong magnetic contact of light current or the same corridor of long range
The construction of line, the zero-sequence direction component faulty action preventing method for perfecting circuit using model error identification is equally applicable.
Claims (1)
1. a kind of zero-sequence direction component faulty action preventing method, it is characterised in that comprise the following steps：
(1) phase current of route protection installation place is obtained；
(2) fault component of phase current is extracted；
(3) according to the starting criteria of faulty action preventing algorithm, judge whether to start faulty action preventing algorithm；If started, into step (4)；
(4) similarity of each phase fault current weight waveform in each circuit is compared；Selected according to similarity-rough set result and perfect line
Road, and give its zero-sequence direction component locking, the zero-sequence direction component of faulty line then refuses locking；
In step (4) by calculate the model error faults current weight waveform of three-phase fault current weight between any two it
Between similarity, and using any two tectonic model error criterion in three model errors；If two moulds of a certain circuit
Type error amount is respectively less than setting valve, judges this circuit to perfect circuit, and give locking to zero-sequence direction component；If a certain circuit
Two model error values not be both less than setting valve, then judge that this circuit, as faulty line, locking is refused to zero-sequence direction component；
The model error of three-phase fault current weight between any two is in step (4)：
Wherein, Δ iαWith Δ iβFor the two-phase in A, B, C three-phase fault current weight；N is per cycle sampling number.
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| CN106899010B (en) * | 2015-12-21 | 2019-04-05 | 中国电力科学研究院 | A kind of zero-sequenceprotection method considering disconnection fault |
| CN106300254B (en) * | 2016-10-13 | 2019-02-15 | 国家电网公司 | Route is single-phase or the relay protecting method of two-phase broken string for a kind of identification |
Citations (3)
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| CN1452287A (en) * | 2003-05-20 | 2003-10-29 | 西安交通大学 | Failure component extracting algorithm based on failure type |
| CN102427223A (en) * | 2011-10-21 | 2012-04-25 | 浙江省电力公司 | Method for judging locking by adopting zero sequence voltage and current |
| CN102820640A (en) * | 2012-07-25 | 2012-12-12 | 西安交通大学 | Method for blocking elements in zero-sequence direction for double-circuit lines on same tower |
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2015
- 2015-01-12 CN CN201510014671.8A patent/CN104578008B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1452287A (en) * | 2003-05-20 | 2003-10-29 | 西安交通大学 | Failure component extracting algorithm based on failure type |
| CN102427223A (en) * | 2011-10-21 | 2012-04-25 | 浙江省电力公司 | Method for judging locking by adopting zero sequence voltage and current |
| CN102820640A (en) * | 2012-07-25 | 2012-12-12 | 西安交通大学 | Method for blocking elements in zero-sequence direction for double-circuit lines on same tower |
Non-Patent Citations (1)
| Title |
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| 基于相电流突变量的配电网单相接地故障区段定位;宋国兵等;《电力系统自动化》;20111110;第2.1节，图2 * |
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