CN106353638A - Fault line selection method based on transient current projection component projection coefficient comparison - Google Patents
Fault line selection method based on transient current projection component projection coefficient comparison Download PDFInfo
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- CN106353638A CN106353638A CN201610777029.XA CN201610777029A CN106353638A CN 106353638 A CN106353638 A CN 106353638A CN 201610777029 A CN201610777029 A CN 201610777029A CN 106353638 A CN106353638 A CN 106353638A
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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 fault line selection method based on transient current projection component projection coefficient comparison. When the busbar zero-sequence voltage amplitude exceeds a constant value, zero-sequence current of each feeder outlet of a power distribution network is acquired, transient components of the zero-sequence current of each feeder outlet and busbar zero-sequence voltage are extracted, then transient zero-sequence current of each feeder outlet is projected on the busbar transient zero-sequence voltage, finally, fault lines are judged according to projection coefficients of projection components, and a feeder with the largest projection coefficient is selected as a fault feeder. The method solves the problem about line selection for high resistance ground faults in small current ground systems and has high actual application value.
Description
Technical field
The present invention relates to distribution network failure detection technique field, more particularly, to one kind are based on the projection of transient current projection components
The fault-line selecting method of coefficients comparison.
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.'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 the reasons such as (generally a level), trouble point be unstable further, 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 affected by tv/ta change of disease error (as degree of unbalancedness) 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 that projection coefficient compares.
For achieving the above object, the technical solution used in the present invention is:
A kind of fault-line selecting method being compared based on transient current projection components projection coefficient is it is characterised in that include following walking
Rapid:
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 and export 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 coefficient of transient zero-sequence current:
；
S4: compare the projection coefficient size that each bar feeder line exports transient zero-sequence current, select the maximum feeder line of projection coefficient to be event
Barrier feeder line；
Preferably, line selection apparatus described in step s1 start threshold value scope be 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 projected based on transient current projection components
The fault-line selecting method of coefficients comparison, 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, line selection apparatus start threshold value scope be 15v <u th <90v.When there is high resistance earthing fault in circuit, route selection fills
Put and started according to bus residual voltage, and record bus residual voltage, the zero sequence current signal in each bar feeder line exit, fault are held
The fault datas such as continuous time, time of failure, then carry out failure line selection according to recorded data.
S2: extract each bar feeder line and export 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 coefficient that each bar feeder line exports transient zero-sequence current:
；
S4: compare the projection coefficient size that each bar feeder line exports transient zero-sequence current, select the maximum feeder line of projection coefficient to be event
Barrier feeder line；
Fig. 2 is typical distribution circuit emulation model structure schematic diagram.In the present embodiment, there is high resistance ground in setting circuit 2 end
Fault, to verify the effectiveness of said method.
(1) 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 and export 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:
；
Thus calculate；；；；；
(4) compare the projection coefficient size that each bar feeder line exports transient zero-sequence current, select the maximum feeder line of projection coefficient to be event
Barrier feeder line.From above-mentioned result of calculation, the projection coefficient of feeder line 2 is maximum, and therefore, selection feeder line 2 is fault feeder.Calculate knot
Fruit is consistent with actual result, and this method is effective.
(2) 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 and export zero-sequence currentAnd bus residual voltageTransient state component、, such as Fig. 4
Shown in (b)；
(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:
；
Thus calculate；；；；；
(4) compare the projection coefficient size that each bar feeder line exports transient zero-sequence current, select the maximum feeder line of projection coefficient to be event
Barrier feeder line.From above-mentioned result of calculation, the projection coefficient of feeder line 2 is maximum, and therefore, selection feeder line 2 is fault feeder.Calculate knot
Fruit 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 being compared based on transient current projection components projection coefficient is it is characterised in that include following
Step:
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 and export 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 coefficient of transient zero-sequence current:
；
S4: compare the projection coefficient size that each bar feeder line exports transient zero-sequence current, select the maximum feeder line of projection coefficient to be event
Barrier feeder line.
2. a kind of fault-line selecting method being compared based on transient current projection components projection coefficient according to claim 1,
It is characterized in that, line selection apparatus described in step s1 start threshold value scope be 15v <u th <90v.
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Cited By (4)
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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 |
| CN107144726A (en) * | 2017-06-09 | 2017-09-08 | 深圳市中电电力技术股份有限公司 | A kind of A step voltages transient state monitoring device, method and system |
| CN107192883A (en) * | 2017-05-22 | 2017-09-22 | 中国石油大学(华东) | A kind of resonant earthed system high resistance earthing fault transition resistance discrimination method |
| CN107861031A (en) * | 2017-10-19 | 2018-03-30 | 成都汉度科技有限公司 | Realize that line insulation is monitored on-line based on transient fault signal |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN107192883A (en) * | 2017-05-22 | 2017-09-22 | 中国石油大学(华东) | A kind of resonant earthed system high resistance earthing fault transition resistance discrimination method |
| CN107192883B (en) * | 2017-05-22 | 2019-10-29 | 中国石油大学(华东) | A kind of resonant earthed system high resistance earthing fault transition resistance discrimination method |
| CN107144726A (en) * | 2017-06-09 | 2017-09-08 | 深圳市中电电力技术股份有限公司 | A kind of A step voltages transient state monitoring device, method and system |
| CN107144726B (en) * | 2017-06-09 | 2019-11-15 | 深圳市中电电力技术股份有限公司 | A kind of A step voltage transient state monitoring device, method and system |
| CN107861031A (en) * | 2017-10-19 | 2018-03-30 | 成都汉度科技有限公司 | Realize that line insulation is monitored on-line based on transient fault signal |
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