CN104833900B - The faulty line selection method of low current singlephase earth fault - Google Patents
The faulty line selection method of low current singlephase earth fault Download PDFInfo
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- 238000010187 selection method Methods 0.000 title claims abstract description 11
- 238000005259 measurement Methods 0.000 claims abstract description 31
- 230000007257 malfunction Effects 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
Abstract
The present invention relates to a kind of faulty line selection method of low current singlephase earth fault, it comprises the following steps：Step 1, when bus residual voltage be more than threshold voltage when, jump to step 2；Step 2, determination are used as corresponding fault measurement value during each feed line failure criterion using steady-state current amplitude, steady-state current phase angle and stable state zero sequence admittance amplitude respectively；Step 3, the weight for determining each failure criterion, and be modified according to the weight of determination to the fault measurement value of each failure criterion, step 4, are merged using D S evidence theories, to obtain the probability of malfunction value of i-th feeder line；The probability of malfunction value of step 5, relatively each feed line obtained above, and using feeder line corresponding with maximum probability of malfunction value as singlephase earth fault circuit.The present invention is easy to operate, improves the route selection efficiency and route selection precision of low current singlephase earth fault, safe and reliable.
Description
Technical field
The present invention relates to a kind of selection method, especially a kind of faulty line selection method of low current singlephase earth fault, category
In the technical field of power system failure diagnostic.
Background technology
Counted according to the dependent failure situation of operation power department of China, in small current neutral grounding system, singlephase earth fault
Incidence highest, account for more than the 85% of various failure.When singlephase earth fault occurs for system, because fault-signal is more micro-
It is weak, power distribution network complicated structure and severe field condition, the route selection of single-phase grounded malfunction in grounded system of low current in itself in addition
It is one in the power system problem not solved very well yet so far with orientation problem.Existing various selection methods can not
The shortcomings of presence fault-signal detection difficulty that avoids is big, high and positioning precision of falsely dropping False Rate is poor；And current failure is determined
Position method still relies primarily on artificial line walking, not only consumes substantial amounts of manpower and materials, extends the system cut-off time, reduces and be
System power supply reliability, it is impossible to adapt to the demand for development of power distribution automation.
The content of the invention
The purpose of the present invention is to overcome the deficiencies in the prior art there is provided a kind of the comprehensive of low current singlephase earth fault
Selection method is closed, its is easy to operate, improve the route selection efficiency and route selection precision of low current singlephase earth fault, it is safe and reliable.
A kind of technical scheme provided according to the present invention, faulty line selection method of low current singlephase earth fault is described to connect
The faulty line selection method of earth fault comprises the following steps：
Step 1, the residual voltage for gathering bus, when the residual voltage of the bus is more than the threshold voltage of setting, are jumped
Go to step 2；
Step 2, collection are connected the feeder current of feeder line with bus, female according to the feeder current of each feeder line and above-mentioned collection
Steady-state current amplitude, steady-state current phase angle and the stable state zero sequence that the residual voltage of line obtains as each feed line failure criterion are led
Receive amplitude, and determine to be used as each feed line using steady-state current amplitude, steady-state current phase angle and stable state zero sequence admittance amplitude respectively
Corresponding fault measurement value m during failure criterionj(li), wherein, j=1,2,3, i=0,1,2 ..., N, N is the feedback being connected with bus
The quantity of line；
Step 3, the weight for determining each failure criterion, and according to the fault measurement of the weight of determination to each failure criterion
Value mj(li) be modified, the revised fault measurement value is：
m′j(li)=mj(li)*ωj, j=1,2,3, i=0,1,2 ..., N
Step 4, merged using D-S evidence theory, to obtain the probability of malfunction value m (l of i-th feeder linei) be
Wherein,A is to own using steady-state current amplitude as during failure criterion
The set of the revised fault measurement value of feeder line, B is revised using steady-state current phase angle as all feeder lines during failure criterion
The set of fault measurement value, C is to be used as all feeder lines revised fault measurement during failure criterion using stable state zero sequence admittance amplitude
The set of value；
The probability of malfunction value of step 5, each feed line relatively more obtained above, and will be corresponding with maximum probability of malfunction value
Feeder line as singlephase earth fault circuit.
Comprise the following steps in the step 3：
Step 3.1, in steady-state current amplitude, two failure criterions of steady-state current phase angle, steady-state current amplitude with it is steady
The correlation coefficient r of both state current phase angles12For
Wherein, m1(li) be i-th feeder line using steady-state current amplitude as failure criterion when fault measurement value, m2(li) be
Fault measurement value when i-th feeder line is using steady-state current phase angle as failure criterion；
The mutual distance d of both step 3.2, steady-state current amplitude and steady-state current phase angle12For
Wherein, A ' is the set using steady-state current amplitude as the fault measurement value of all feeder lines during failure criterion, and B ' is
The set of the fault measurement value of all feeder lines during failure criterion is used as using steady-state current phase angle；
Step 3.3, the consistent degree a for determining distance between steady-state current amplitude and steady-state current phase angle12For
Step 3.4, according to said process, obtain the one of steady-state current amplitude and the distance between stable state zero sequence admittance amplitude
Cause degree a13And the distance between steady-state current phase angle and stable state zero sequence admittance amplitude consistent degree a23, so as to obtain steady-state current
The weights omega of amplitude1, have
Step 3.5, basis obtain the weights omega of steady-state current amplitude1Process, obtain the weights omega of steady-state current phase angle2
And the weights omega of stable state zero sequence admittance amplitude3。
Advantages of the present invention：It regard steady-state current amplitude, steady-state current phase angle and stable state zero sequence admittance amplitude as failure
Criterion, is carried out by D-S evidence theory, the probability of malfunction value of maximum is obtained, can quickly realize the feedback to singlephase earth fault
Line judges that judgement precision is high, safe and reliable.
Brief description of the drawings
Fig. 1 is flow chart of the invention.
Embodiment
With reference to specific drawings and examples, the invention will be further described.
As shown in Figure 1：In order to improve the route selection efficiency and route selection precision of low current singlephase earth fault, present invention ground connection
The faulty line selection method of failure comprises the following steps：
Step 1, the residual voltage for gathering bus, when the residual voltage of the bus is more than the threshold voltage of setting, are jumped
Go to step 2；
Specifically, the residual voltage of bus can be obtained by conventional technology, the threshold voltage of setting is according to difference
The working condition of bus be determined, the gatherer process of the residual voltage of bus and the size for setting threshold voltage are this
Known to technical field personnel, here is omitted.After the residual voltage of bus is being collected, by the residual voltage of bus with
The threshold voltage of setting is compared, when bus residual voltage be not more than setting threshold voltage when, then illustrate bus and
Low current singlephase earth fault is not present between the feeder line being connected with bus, otherwise, i.e., explanation has low current singlephase earth fault.
When in the absence of low current singlephase earth fault, then need continuous collecting bus residual voltage and by the residual voltage of bus with
The threshold voltage of setting compares, can find low current singlephase earth fault in time.And determine there is the event of low current single-phase earthing
After barrier, then following step is performed, to determine the circuit for occurring low current singlephase earth fault.
Step 2, collection are connected the feeder current of feeder line with bus, female according to the feeder current of each feeder line and above-mentioned collection
Steady-state current amplitude, steady-state current phase angle and the stable state zero sequence that the residual voltage of line obtains as each feed line failure criterion are led
Receive amplitude, and determine to be used as each feed line using steady-state current amplitude, steady-state current phase angle and stable state zero sequence admittance amplitude respectively
Corresponding fault measurement value m during failure criterionj(li), wherein, j=1,2,3, i=0,1,2 ..., N, N is the feedback being connected with bus
The quantity of line；
Specifically, the feeder current of feeder line is gathered by conventional technology, the process of feeder current is obtained for this
Known to technical field personnel, here is omitted.For an arbitrary feeder line, it is determined that the feeder line feeder current with
And after the residual voltage of bus, according to feeder current and the residual voltage of bus, then can obtain the steady-state current of each feed line
Amplitude, steady-state current phase angle and stable state zero sequence admittance amplitude.Calculated and obtained according to the residual voltage of feeder current and bus
The process of steady-state current amplitude, steady-state current phase angle and stable state zero sequence admittance amplitude be those skilled in the art known to, this
Place is repeated no more.
In the embodiment of the present invention, after it is determined that producing low current singlephase earth fault, for any one feeder line, respectively with steady
State current amplitude, steady-state current phase angle and stable state zero sequence admittance amplitude judge whether its feeder line is small electricity as failure criterion
Flow the faulty line of single-phase earthing.For any feeder line, in steady-state current amplitude, steady-state current phase angle and stable state zero sequence admittance
In three failure criterions of amplitude, then faulty measure value mj(li), that is, represent the failure of j-th of failure criterion of i-th feeder line
Measure value, when i is 0, represents bus.Correspondence in steady-state current amplitude, steady-state current phase angle and stable state zero sequence admittance amplitude
Fault measurement value computational methods for known to those skilled in the art, here is omitted.
Step 3, the weight for determining each failure criterion, and according to the fault measurement of the weight of determination to each failure criterion
Value mj(li) be modified, the revised fault measurement value is：
m′j(li)=mj(li)*ωj, j=1,2,3, i=0,1,2 ..., N
Comprise the following steps in the step 3：
Step 3.1, in steady-state current amplitude, two failure criterions of steady-state current phase angle, steady-state current amplitude with it is steady
The correlation coefficient r of both state current phase angles12For
Wherein, m1(li) be i-th feeder line using steady-state current amplitude as failure criterion when fault measurement value, m2(li) be
Fault measurement value when i-th feeder line is using steady-state current phase angle as failure criterion；
The mutual distance d of both step 3.2, steady-state current amplitude and steady-state current phase angle12For
Wherein, A ' is the set using steady-state current amplitude as the fault measurement value of all feeder lines during failure criterion, and B ' is
The set of the fault measurement value of all feeder lines during failure criterion is used as using steady-state current phase angle.
Step 3.3, the consistent degree a for determining distance between steady-state current amplitude and steady-state current phase angle12For
Step 3.4, according to said process, obtain the one of steady-state current amplitude and the distance between stable state zero sequence admittance amplitude
Cause degree a13And the distance between steady-state current phase angle and stable state zero sequence admittance amplitude consistent degree a23, so as to obtain steady-state current
The weights omega of amplitude1, have
Step 3.5, basis obtain the weights omega of steady-state current amplitude1Process, obtain the weights omega of steady-state current phase angle2
And the weights omega of stable state zero sequence admittance amplitude3。
Step 4, merged using D-S evidence theory, to obtain the probability of malfunction value m (l of i-th feeder linei) be
Wherein,A is to be used as all feedbacks during failure criterion using steady-state current amplitude
The set of the revised fault measurement value of line, B is to be used as the revised event of all feeder lines during failure criterion using steady-state current phase angle
Hinder the set of measure value, C is to be used as the revised fault measurement value of all feeder lines during failure criterion using stable state zero sequence admittance amplitude
Set；
The probability of malfunction value of step 5, each feed line relatively more obtained above, and will be corresponding with maximum probability of malfunction value
Feeder line as singlephase earth fault circuit.
In the embodiment of the present invention, by the probability of malfunction value of relatively more all feeder lines, maximum probability of malfunction value m (l are selectedi)
It is used as the circuit of singlephase earth fault.
Claims (1)
1. a kind of faulty line selection method of low current singlephase earth fault, it is characterized in that, the faulty line selection side of the earth fault
Method comprises the following steps：
Step 1, the residual voltage for gathering bus, when the residual voltage of the bus is more than the threshold voltage of setting, are jumped to
Step 2；
Step 2, collection are connected the feeder current of feeder line with bus, according to the feeder current of each feeder line and above-mentioned collection bus
Residual voltage obtains steady-state current amplitude, steady-state current phase angle and the stable state zero sequence admittance width as each feed line failure criterion
Value, and determine to be used as each feed line failure using steady-state current amplitude, steady-state current phase angle and stable state zero sequence admittance amplitude respectively
Corresponding fault measurement value m during criterionj(li), wherein, j=1,2,3, i=0,1,2 ..., N, N is the feeder line being connected with bus
Quantity；
Step 3, the weight for determining each failure criterion, and according to the fault measurement value m of the weight of determination to each failure criterionj
(li) be modified, the revised fault measurement value is：
m′j(li)=mj(li)*ωj, j=1,2,3, i=0,1,2 ..., N
Step 4, merged using D-S evidence theory, to obtain the probability of malfunction value m (l of i-th feeder linei) be
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Wherein,A is to be repaiied using steady-state current amplitude as all feeder lines during failure criterion
The set of fault measurement value after just, B is to be surveyed using steady-state current phase angle as the revised failure of all feeder lines during failure criterion
The set of angle value, C is the collection using stable state zero sequence admittance amplitude as the revised fault measurement value of all feeder lines during failure criterion
Close；
The probability of malfunction value of step 5, relatively each feed line obtained above, and by feeder line corresponding with maximum probability of malfunction value
It is used as the circuit of singlephase earth fault；
Comprise the following steps in the step 3：
Step 3.1, in steady-state current amplitude, two failure criterions of steady-state current phase angle, steady-state current amplitude and stable state electricity
Flow the correlation coefficient r of both phase angles12For
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Wherein, m1(li) be i-th feeder line using steady-state current amplitude as failure criterion when fault measurement value, m2(li) it is i-th
Fault measurement value when feeder line is using steady-state current phase angle as failure criterion；
The mutual distance d of both step 3.2, steady-state current amplitude and steady-state current phase angle12For
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Wherein, A ' is the set using steady-state current amplitude as the fault measurement value of all feeder lines during failure criterion, and B ' is with steady
The set of the fault measurement value of all feeder lines when state current phase angle is as failure criterion；
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| CN105425109B (en) * | 2015-11-27 | 2018-07-27 | 天津大学 | A kind of small current grounding system single-phase grounding selecting method that can improve accuracy rate |
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| CN106019047A (en) * | 2016-05-18 | 2016-10-12 | 成都理工大学 | Comprehensive line selection fault measurement calculation method for small-current grounding system |
| CN108919046B (en) * | 2018-05-15 | 2020-11-06 | 国网山东省电力公司济南供电公司 | Power distribution network ground fault trial stop line sequence decision method and system |
| CN109581142B (en) * | 2019-01-25 | 2020-06-09 | 广东电网有限责任公司 | Novel multi-dimensional fusion high-voltage generator set stator single-phase earth fault detection method |
| CN112710923B (en) * | 2020-12-16 | 2022-07-26 | 中国电建集团华东勘测设计研究院有限公司 | Data-driven single-phase earth fault line selection method based on post-fault steady-state information |
| CN112710924B (en) * | 2020-12-16 | 2022-07-26 | 中国电建集团华东勘测设计研究院有限公司 | Single-phase earth fault line selection method based on steady-state variable quantity before and after fault |
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