CN106405330A - Transient current projection component polarity comparison-based fault line selection method - Google Patents
Transient current projection component polarity comparison-based fault line selection method Download PDFInfo
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- CN106405330A CN106405330A CN201610787422.7A CN201610787422A CN106405330A CN 106405330 A CN106405330 A CN 106405330A CN 201610787422 A CN201610787422 A CN 201610787422A CN 106405330 A CN106405330 A CN 106405330A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
Abstract
The invention discloses a transient current projection component polarity comparison-based fault line selection method. When a zero sequence voltage amplitude value of a bus exceeds a fixed value, zero sequence currents of all feed line outlet openings of a power distribution network are collected, transient components of the zero sequence currents of all the feed line outlet openings and transient components of zero sequence voltage of the bus are extracted, transient zero sequence currents of all the feed line outlet openings are projected onto transient zero sequence voltage of the bus, and a faulty line is determined according to a projection component polarity relation. A feed line of which transient current projection component polarity is opposite to transient current projection component polarity of other candidate feed lines is chosen as a faulty feed line; when all the candidate feed lines are the same in transient current projection component polarity, the bus is the faulty line. The transient current projection component polarity comparison-based fault line selection method can help solve a difficult fault line section problem in a small current grounding system when a high resistance earth fault occurs, and the transient current projection component polarity comparison-based fault line selection method can be widely applied.
Description
Technical field
The present invention relates to distribution network failure detection technique field, more particularly, to one kind are based on transient current projection components polarity
Fault-line selecting method relatively.
Background technology
Because medium voltage distribution network region be directly facing user, and single-phase earthing about accounts for total 80% of distribution network failure, single-phase
Reliably detection is notable on power supply reliability impact for earth fault.In China and Continental Europe, most medium voltage distribution networks are using through disappearing
Arc coil earthing mode, i.e. so-called resonant earthed system.Do not need during singlephase earth fault to excise fault immediately, be conducive to improving
Power supply reliability, but due to the reason such as fault current is faint, identification earth fault line has larger difficulty.In recent years, Europe and in
Utilization fault transient electric parameters that state develops respectively, in neutral point is added the route selection technology such as resistance, efficiently solve transition electricity
Earth fault line selection problem when resistance is less.
On the other hand, affected apart from low factor by natural environment, fixed track usage plan, often occur in power distribution network to lead through non-ideal
The single-phase high-impedance of body, such as wire falls in meadow, road etc..French small current neutral grounding system has more than 12% connect
Earth fault is high resistance ground, and U.S.'s DianKeYuan (EPRI) statistics shows, the U.S.（Three-phase four-wire system multiple spot is directly grounded）Power distribution network
The ratio of high resistive fault is 2% ~ 5%.Because fault current reduces further（Generally A level）, the reason such as trouble point is unstable, humorous
The high resistance earthing fault detection of earthed system of shaking remains a very big challenge.
Low current grounding transient analysis and transient state detection technique are study hotspots in recent years, also achieve more
Achievement, but high resistance earthing fault route selection problem is less takes into account, and achievement is also relatively fewer.Scholar is had to propose using each bar circuit event
Phasor relation between three-phase current variable quantity before and after barrier, calculates each line-to-ground conduction current, and can derive over the ground further
Conductance, selects conduction current over the ground maximum or the maximum circuit of conductance is faulty line over the ground.What the method faced is mainly stranded
Difficulty is that line selection apparatus need to access three-phase current signal and be subject to TV/TA change of disease error（As degree of unbalancedness）Impact is larger.
For small current neutral grounding system, power current itself no obvious fault feature cannot be directly in order to fault detect（Work
The frequency active component of current is possible in theory, but content is less, easily affected by TV/TA Transfer characteristic, and practicality has larger difficulty）,
Other technical schemes must be sought.
Content of the invention
It is an object of the invention to proposing one kind to be based on each bar feeder line transient current projection components on bus transient voltage
The fault-line selecting method of Polarity comparision.
For achieving the above object, the technical solution used in the present invention is：
A kind of fault-line selecting method based on transient current projection components Polarity comparision is it is characterised in that comprise the following steps：
S1：Line selection apparatus are responsible for on-line monitoring bus residual voltageExport zero-sequence current with each bar feeder line, when described bus
Residual voltageWhen amplitude is in described line selection apparatus startup threshold value scope, then there is high resistance earthing fault in explanation system；
S2：Extract each bar feeder line outlet zero-sequence currentAnd bus residual voltageTransient state component、；
S3：Each bar candidate's feeder line outlet transient zero-sequence current is projected to bus transient zero-sequence voltage, and according to the following formula
Each bar feeder line exports the projection components of transient zero-sequence current：
；
S4：Using polarity coefficientThe polarity of candidate's feeder line transient current projection components is compared two-by-two, when kth, m bar
Feeder line transient current projection components、Polarity when being compared, formula is：
In formula, T is the transient process persistent period；IfShow、Same polarity；IfShow、Reversed polarity；
S5：It is then to show that bus breaks down when the projection of all candidate's feeder line transient currents is same polarity；When a certain candidate feedback
When line transient current projection components are reversed polarity with other candidate's feeder line transient current projection components, then this candidate's feeder line is event
Barrier feeder line.
Preferably, the line selection apparatus described in step S1 start threshold value scope is 15V<U th <90V.
Compared to the prior art, what the present invention produced has the beneficial effects that the present invention solves high resistance earthing fault in little electricity
A failure line selection difficult problem in stream earthed system, has extensive actual application value.
Brief description
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, will make to required in embodiment description below
Accompanying drawing be briefly described it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, can also be obtained other according to these accompanying drawings
Accompanying drawing, wherein：
Fig. 1 is route selection FB(flow block) proposed by the present invention；
Fig. 2 is typical distribution circuit emulation model structure schematic diagram；
There is each feeder current busbar voltage during the high resistance earthing fault that earth resistance is 30 Ω for system shown in Figure 2 in Fig. 3 (a)
Zero-sequence component comparison of wave shape figure；
There is each feeder current busbar voltage during the high resistance earthing fault that earth resistance is 30 Ω for system shown in Figure 2 in Fig. 3 (b)
Transient state component comparison of wave shape figure；
There is each feeder current busbar voltage during the high resistance earthing fault that earth resistance is 30 Ω for system shown in Figure 2 in Fig. 3 (c)
Projection components comparison of wave shape figure；
There is each feeder current busbar voltage during the high resistance earthing fault that earth resistance is 1500 Ω for system shown in Figure 2 in Fig. 4 (a)
Zero-sequence component comparison of wave shape figure；
There is each feeder current busbar voltage during the high resistance earthing fault that earth resistance is 1500 Ω for system shown in Figure 2 in Fig. 4 (b)
Transient state component comparison of wave shape figure；
There is each feeder current busbar voltage during the high resistance earthing fault that earth resistance is 1500 Ω for system shown in Figure 2 in Fig. 4 (c)
Projection components comparison of wave shape figure.
Specific embodiment
Below in conjunction with the accompanying drawing in present example, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground description.Obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on and send out
Embodiment in bright, the every other enforcement that those of ordinary skill in the art are obtained under the premise of not making creative work
Example, broadly falls into the scope of protection of the invention.
Fig. 1 is route selection FB(flow block) proposed by the present invention, as shown in figure 1, a kind of be based on transient current projection components polarity
Fault-line selecting method relatively, comprises the following steps：
S1：Line selection apparatus are responsible for on-line monitoring bus residual voltageExport zero-sequence current with each bar feeder line, when described bus
Residual voltageWhen amplitude is in described line selection apparatus startup threshold value scope, then there is high resistance earthing fault in explanation system.This
In embodiment, it is 15V that line selection apparatus start threshold value scope<U th <90V.When there is high resistance earthing fault in circuit, route selection
Device starts according to bus residual voltage, and records bus residual voltage, the zero sequence current signal in each bar feeder line exit, fault
The fault datas such as persistent period, time of failure, then carry out failure line selection according to recorded data.
S2：Extract each bar feeder line outlet zero-sequence currentAnd bus residual voltageTransient state component、.
S3：Each bar candidate's feeder line outlet transient zero-sequence current is projected to bus transient zero-sequence voltage, and presses following formula
Calculate the projection components that each bar feeder line exports transient zero-sequence current：
.
S4：Using polarity coefficientThe polarity of candidate's feeder line transient current projection components is compared two-by-two, such as kth,
M bar feeder line transient current projection components、The formula that is compared of polarity be：
In formula, T is the transient process persistent period；IfShow、Same polarity；IfShow、Reversed polarity；
S5：It is then to show that bus breaks down when the projection of all candidate's feeder line transient currents is same polarity；When a certain candidate feedback
When line transient current projection components are reversed polarity with other candidate's feeder line transient current projection components, then this candidate's feeder line is event
Barrier feeder line.
Fig. 2 is typical distribution circuit emulation model structure schematic diagram.In the present embodiment, there is high resistant in setting circuit 2 end
Earth fault, to verify the effectiveness of said method.
（One）There is the high resistance earthing fault of 30 Ω in circuit 2 end
（1）When bus residual voltage amplitude surmounts preset threshold, starter record bus residual voltage, the outlet of each bar feeder line
The zero sequence current signal at place, such as shown in Fig. 3 (a)；
（2）Extract each bar feeder line outlet zero-sequence currentAnd bus residual voltageTransient state component、, such as Fig. 3 (b)
Shown；
（3）Each bar candidate's feeder line outlet transient zero-sequence current is projected to bus transient zero-sequence voltage, such as shown in Fig. 3 (c), root
Calculate the projection components that each bar feeder line exports transient zero-sequence current according to following formula：
；
（4）Using polarity coefficientThe polarity of candidate's feeder line transient current projection components is compared two-by-two, the public affairs comparing
Formula is：
In formula, T is the transient process persistent period；IfShow、Same polarity；IfShow、Reversed polarity；
（5）Result of the comparison shows, feeder line 2 is reversed polarity with other candidate's feeder line transient current projection components, then show feeder line 2
For fault feeder, result of calculation is consistent with actual result, and this method is effective.
（Two）There is the high resistance earthing fault of 1500 Ω in circuit 2 end
（1）When bus residual voltage amplitude surmounts preset threshold, starter record bus residual voltage, the outlet of each bar feeder line
The zero sequence current signal at place, such as shown in Fig. 4 (a)；
（2）Extract each bar feeder line outlet zero-sequence currentAnd bus residual voltageTransient state component、, such as Fig. 4 (b)
Shown；
（3）Each bar candidate's feeder line outlet transient zero-sequence current is projected to bus transient zero-sequence voltage, such as shown in Fig. 4 (c), root
Calculate the projection components that each bar feeder line exports transient zero-sequence current according to following formula：
；
（4）Using polarity coefficientThe polarity of candidate's feeder line transient current projection components is compared two-by-two, the public affairs comparing
Formula is：
In formula, T is the transient process persistent period；IfShow、Same polarity；IfShow、Reversed polarity；
（5）Result of the comparison shows, feeder line 2 is reversed polarity with other candidate's feeder line transient current projection components, then show feeder line 2
For fault feeder, result of calculation is consistent with actual result, and this method is effective.
Above example only in order to technical scheme to be described, is not intended to limit；Although with reference to the foregoing embodiments
The present invention has been described in detail, it will be understood by those within the art that：It still can be to aforementioned each enforcement
Technical scheme described in example is modified, or carries out equivalent to wherein some technical characteristics；And these modification or
Replace, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (2)
1. a kind of fault-line selecting method based on transient current projection components Polarity comparision is it is characterised in that comprise the following steps：
S1：Line selection apparatus are responsible for on-line monitoring bus residual voltageExport zero-sequence current with each bar feeder line, when described bus
Residual voltageWhen amplitude is in described line selection apparatus startup threshold value scope, then there is high resistance earthing fault in explanation system；
S2：Extract each bar feeder line outlet zero-sequence currentAnd bus residual voltageTransient state component、；
S3：Each bar candidate's feeder line outlet transient zero-sequence current is projected to bus transient zero-sequence voltage, and according to the following formula
Each bar feeder line exports the projection components of transient zero-sequence current：
；
S4：Using polarity coefficientThe polarity of candidate's feeder line transient current projection components is compared two-by-two, when kth, m bar
Feeder line transient current projection components、Polarity when being compared, formula is：
In formula, T is the transient process persistent period；IfShow、Same polarity；IfShow
、Reversed polarity；
S5：It is then to show that bus breaks down when the projection of all candidate's feeder line transient currents is same polarity；When a certain candidate feedback
When line transient current projection components are reversed polarity with other candidate's feeder line transient current projection components, then this candidate's feeder line is event
Barrier feeder line.
2. a kind of fault-line selecting method based on transient current projection components Polarity comparision according to claim 1, it is special
Levy and be, it is 15V that the line selection apparatus described in step S1 start threshold value scope<U th <90V.
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| CN201610787422.7A CN106405330A (en) | 2016-08-31 | 2016-08-31 | Transient current projection component polarity comparison-based fault line selection method |
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| CN106980069A (en) * | 2017-05-05 | 2017-07-25 | 国网山东省电力公司电力科学研究院 | High resistance earthing fault localization method based on transient current projection coefficient difference comparsion |
| CN106990320A (en) * | 2017-02-24 | 2017-07-28 | 新疆电力建设调试所 | A kind of microgrid, micro-grid system and microgrid Fault Locating Method |
| CN108896876A (en) * | 2018-07-26 | 2018-11-27 | 国网山东省电力公司莱芜供电公司 | A kind of electric network fault detection method, device, equipment and storage medium |
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| CN108896876A (en) * | 2018-07-26 | 2018-11-27 | 国网山东省电力公司莱芜供电公司 | A kind of electric network fault detection method, device, equipment and storage medium |
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