CN106908697A - A kind of synthetic power-frequency and the distribution network fault line selection method in transient reactive power direction - Google Patents
A kind of synthetic power-frequency and the distribution network fault line selection method in transient reactive power direction Download PDFInfo
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- 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
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- 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
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Abstract
The present invention relates to distribution network failure detection technique field, and in particular to the distribution network fault line selection method in a kind of synthetic power-frequency and transient reactive power direction.After it there is singlephase earth fault, the present invention chooses the larger outlet of transient zero-sequence current Amplitude Ration as the alternative outlet of failure first, then the transient reactive power and power frequency reactive power of the alternative outlet of failure are calculated, its transient reactive power is modified using the sign function of power frequency reactive power, recycle revised transient reactive power finds out failure outlet；The present invention solves the problems, such as the uncertain single-phase earth fault line selection of TV, TA polarity in small current neutral grounding mode distribution system.TV, TA polarity of power distribution network are unknown in practical application, solve the problems, such as the uncertain single-phase grounding fault line selection in small current grounding of TV, TA polarity, there is extensive actual application value.
Description
Technical field
The present invention relates to distribution network failure detection technique field, and in particular to a kind of synthetic power-frequency and transient reactive power side
To distribution network fault line selection method.
Background technology
Resonance neutral grounding is used China's 6~35kV medium voltage distribution networks more, and arc suppression coil is typically in overcompensation state.
Although so improve fault self-recovery level and power supply reliability, the inductive current of overcompensation makes faulty line power frequency zero sequence electricity
Stream polarity is identical with circuit is perfected, amplitude is even less than and perfects circuit so that tradition utilizes the failure line selection side of stable state electrical quantity
Method there are problems that failure amount it is not prominent, unstable or even, it is impossible to ensure reliability and the sensitivity of route selection.Due to
Earth fault transient current amplitude be usually the several times of power current to decades of times, up to hundreds of amperes, and do not receive arc suppression coil
Compensation way influences, therefore transient line selection reliability in resonator system is higher.By development in recent years, using transient state electricity
The low-current ground fault line selection technology of tolerance has been realized breaking through.
Using fault transient reactive power direction（Hereinafter referred to as transient power）Route selection is a kind of typical case side of transient state route selection
Method.Transient power selection method is the transient reactive power direction by relatively each outlet, direction it is different with other outlets be
Failure outlet, is busbar grounding failure if all outlet transient reactive power directions are all identical.The method is not required nothing more than
Zero sequence current mutual inductor between each outlet（TA）Polarity is consistent, also requires zero sequential potential transformer（TV）Corresponding TA poles
Property is consistent, and just can guarantee that the correctness in transient power direction, and then carry out correct route selection.But due to conventional electrical distribution circuit very
Direction protection is used less, and the installation of live TV and TA is seldom in view of the polar relationship between transformer, it is easy to due to once
Side secondary side wiring is not corresponded to and causes error-polarity connection, is made transient power direction calculating uncertain and is caused route selection mistake.
Number of patent application：CN201210479994.0, title：A kind of resonant earthed system choosing based on reactive power flow direction
Line method and paper《The resonant earthed system low-current ground fault line selection of comprehensive transient state and power frequency information》Propose respectively logical
Cross and compare the method for the uniformity of each outlet transient reactive power and power frequency reactive power flow direction after low current grounding and carry out
Route selection, this method eliminates the uncertain influence of TV, TA polarity, improve the reliability and adaptability of transient state route selection.But should
Algorithm is not readily understood in principle, route selection process slightly complicated.
The content of the invention
In order to failure line selection when solving to occur in the uncertain small current neutral grounding system of TV, TA polarity single-phase earthing is asked
Topic, the invention provides a kind of synthetic power-frequency and the distribution network fault line selection method in transient reactive power direction, particular technique side
Case is as follows：
The distribution network fault line selection method in a kind of synthetic power-frequency and transient reactive power direction is comprised the following steps：
（1）The zero-sequence current and bus residual voltage in each outlet bus exit of on-line acquisition system, when monitoring bus zero sequence
When voltage magnitude exceedes the bus residual voltage amplitude thresholds for pre-setting, explanation system there occurs singlephase earth fault；
（2）The larger n bars outlet of transient zero-sequence current Amplitude Ration is chosen as the alternative outlet of failure；Wherein n>1；
（3）According to following formula calculation procedures（2）The transient reactive power of the n alternative outlets of bar failure of middle selection：
；
Wherein, k for the alternative outlet of failure numbering, k=1,2, n；TIt is the transient process duration,It is event
Hinder the transient zero-sequence current in the bus exit of alternative outlet k,It is bus transient zero-sequence voltage；If, then table
Show that the transient reactive power of the alternative outlet k of failure flows to the alternative outlet k of failure by bus, the alternative outlet k of failure is to perfect circuit；
If, then it represents that the transient reactive power of the alternative outlet k of failure flows to bus by the alternative outlet k of failure, and failure alternatively goes out
Line k is faulty line；If the faulty alternative outlet of institute is satisfied by, then system is busbar grounding failure；
（4）According to following formulaCalculation procedure（2）Middle selection faulty alternative outlet power frequency reactive power：
；
Wherein, k for the alternative outlet of failure numbering, k=1,2, n；It is the zero-sequence current of the alternative outlet k of failure
Power frequency component,It is bus residual voltage power frequency component,TIt is the transient process duration；If, then it represents that work
Frequency reactive power flows to the alternative outlet k of failure by bus；If, then it represents that power frequency reactive power is by the alternative outlet of failure
K flows to bus；
（5）The transient reactive power of the alternative outlet of failure is modified using the power frequency reactive power of failure alternative outlet, so
Compare revised transient reactive power afterwards, the direction according to revised transient reactive power carries out route selection, if revised
Transient reactive power is, then
；
If, then it represents that transient reactive power flows to the alternative outlet k of failure by bus, and the alternative outlet k of failure is sound
Circuit；If, then it represents that transient reactive power flows to bus by the alternative outlet k of failure, and the alternative outlet k of failure is failure
Circuit；If all circuits are satisfied by, then system is busbar grounding failure.
Further, the step（4）Middle selection T is a power frequency period.
Beneficial effects of the present invention are：
The invention provides a kind of synthetic power-frequency and the distribution network fault line selection method in transient reactive power direction, the present invention is disobeyed
Rely in TV, TA polarity, power frequency reactive power during by singlephase earth fault is modified to transient reactive power, and then utilize
Revised transient reactive power carries out route selection；The invention comprehensively utilizes the idle work(of transient reactive power and power frequency of outlet
Rate, eliminates the influence of TV, TA error-polarity connection, and algorithm is simple, should be readily appreciated that and route selection reliability is high.Power distribution network in practical application
TV, TA polarity it is unknown, occur in the small current neutral grounding system that the present invention solves in the probabilistic power distribution network of TV, TA polarity
Failure line selection problem during single-phase earthing, there is extensive actual application value.
Brief description of the drawings
Accompanying drawing 1 is the flow of the distribution network fault line selection method in a kind of synthetic power-frequency of the invention and transient reactive power direction
Figure；
Accompanying drawing 2 is that small current neutral grounding system occurs each outlet residual voltage and zero-sequence current oscillogram during intermittent grounding fault.
Specific embodiment
In order to be better understood from the present invention, the invention will be further described with specific embodiment below in conjunction with the accompanying drawings：
As shown in figure 1, the distribution network fault line selection method in a kind of synthetic power-frequency and transient reactive power direction is comprised the following steps：
（1）The zero-sequence current and bus residual voltage in each outlet bus exit of on-line acquisition system, when monitoring bus zero sequence
When voltage magnitude exceedes the bus residual voltage amplitude thresholds for pre-setting, explanation system there occurs singlephase earth fault；If female
Line residual voltage amplitude is U0, bus residual voltage amplitude thresholds are U0set, work as U0>U0set, explanation system there occurs single-phase earthing
Failure；Then carry out step（2）；If bus residual voltage amplitude is not above the bus residual voltage amplitude thresholds U for setting0set
When, i.e.,, not there is singlephase earth fault, then continue the zero sequence to each outlet bus exit of system in explanation system
Electric current and bus residual voltage are acquired and monitor；
（2）The larger n bars outlet of transient zero-sequence current Amplitude Ration is chosen as the alternative outlet of failure；Wherein n>1；
（3）According to following formulaCalculation procedure（2）The transient reactive power of the n alternative outlets of bar failure of middle selection：
；
Wherein, k for the alternative outlet of failure numbering, k=1,2, n；TIt is the transient process duration,It is failure
The transient zero-sequence current in the bus exit of alternative outlet k,It is bus transient zero-sequence voltage；If, then it represents that
The transient reactive power of the alternative outlet k of failure flows to the alternative outlet k of failure by bus, and the alternative outlet k of failure is to perfect circuit；Such as
Really, then it represents that the transient reactive power of the alternative outlet k of failure flows to bus by the alternative outlet k of failure, and failure alternatively goes out
Line k is faulty line；If the faulty alternative outlet of institute is satisfied by, then system is busbar grounding failure；
（4）According to following formulaCalculation procedure（2）Middle selection faulty alternative outlet power frequency reactive power：
；
Wherein, k for the alternative outlet of failure numbering, k=1,2, n；It is the zero-sequence current of the alternative outlet k of failure
Power frequency component,It is bus residual voltage power frequency component,TIt is the transient process duration, is chosen for a power frequency period,
That is 20mS, if, then it represents that power frequency reactive power flows to the alternative outlet k of failure by bus；If, then it represents that
Power frequency reactive power flows to bus by the alternative outlet k of failure；
（5）The transient reactive power of the alternative outlet of failure is modified using the power frequency reactive power of failure alternative outlet, so
Compare revised transient reactive power afterwards, the direction according to revised transient reactive power carries out route selection；In resonance grounding
In system, because arc suppression coil is typically in overcompensation state, faulty line is that the perceptual power frequency for flowing to bus by circuit is idle
Power is identical by capacitive power frequency reactive power that bus flows to circuit with circuit is perfected.I.e. power frequency power direction only with TA whether
Reversal connection is relevant, and with whether faulty line is unrelated.When outlet TA polarity is without reversal connection, the power frequency reactive power of all outlets is
Just；When certain outlet TA error-polarity connections, the transient reactive power and power frequency reactive power of the outlet are while reindexing（Multiply simultaneously
With -1）, power frequency reactive power must be negative.Therefore, no matter TA polarity whether reversal connection, be multiplied by with power frequency reactive power sign function
Transient reactive power, will make transient reactive power keep original numerical value, and then carried out using revised transient reactive power
Route selection.If revised transient reactive power is, then
；
If, then it represents that transient reactive power flows to the alternative outlet k of failure by bus, and the alternative outlet k of failure is sound
Circuit；If, then it represents that transient reactive power flows to bus by the alternative outlet k of failure, and the alternative outlet k of failure is failure
Circuit；If all circuits are satisfied by, then system is busbar grounding failure.
The earth fault of certain power supply enterprise 10kV aerial cable joint line systems as shown in Figure 2, wherein, outlet F4 is
The zero sequence TA error-polarity connections of faulty line, outlet F1 and outlet F3.When outlet F4 occur metallicity singlephase earth fault, according to
Lower step carries out route selection：
A. 4 larger outlets of transient zero-sequence current Amplitude Ration are chosen as the alternative outlet of failure；
B. according to formulaCalculate the idle work(of transient state of the 4 alternative outlets of failure chosen
Rate, result of calculation is：
,,,；
C. according to formulaCalculate the 4 power frequency reactive powers of the alternative outlet of failure chosen, meter
Calculating result is：
,,,；
D. according to formulaCalculate the 4 revised transient reactive powers of the alternative outlet of failure chosen, result of calculation is：
,,,；
The revised transient reactive power directions of so outlet F4 and other 3 outlet differences, according to one kind that the present invention is provided
The distribution network fault line selection method in synthetic power-frequency and transient reactive power direction can just select outlet F4 for faulty line, eliminate
Outlet F1, outlet F3 perfect the influence of circuit TA reversal connections.
The present invention is not limited to above-described specific embodiment, the foregoing is only preferable case study on implementation of the invention
, it is not intended to limit the invention, all any modifications made within the spirit and principles in the present invention, equivalent and change
Enter, should be included within the scope of the present invention.
Claims (2)
1. the distribution network fault line selection method in a kind of synthetic power-frequency and transient reactive power direction, it is characterised in that：Including following
Step：
（1）The zero-sequence current and bus residual voltage in each outlet bus exit of on-line acquisition system, when monitoring bus zero sequence
When voltage magnitude exceedes the bus residual voltage amplitude thresholds for pre-setting, explanation system there occurs singlephase earth fault；
（2）The larger n bars outlet of transient zero-sequence current Amplitude Ration is chosen as the alternative outlet of failure；Wherein n>1；
（3）According to following formula calculation procedures（2）The transient reactive power of the n alternative outlets of bar failure of middle selection：
；
Wherein, k for the alternative outlet of failure numbering, k=1,2, n；TIt is the transient process duration,It is failure
The transient zero-sequence current in the bus exit of alternative outlet k,It is bus transient zero-sequence voltage；If, then it represents that
The transient reactive power of the alternative outlet k of failure flows to the alternative outlet k of failure by bus, and the alternative outlet k of failure is to perfect circuit；Such as
Really, then it represents that the transient reactive power of the alternative outlet k of failure flows to bus by the alternative outlet k of failure, and failure alternatively goes out
Line k is faulty line；If the faulty alternative outlet of institute is satisfied by, then system is busbar grounding failure；
（4）According to following formulaCalculation procedure（2）Middle selection faulty alternative outlet power frequency reactive power：
；
Wherein, k for the alternative outlet of failure numbering, k=1,2, n；It is the zero-sequence current of the alternative outlet k of failure
Power frequency component,It is bus residual voltage power frequency component,TIt is the transient process duration；If, then it represents that work
Frequency reactive power flows to the alternative outlet k of failure by bus；If, then it represents that power frequency reactive power is by the alternative outlet of failure
K flows to bus；
（5）The transient reactive power of the alternative outlet of failure is modified using the power frequency reactive power of failure alternative outlet, so
Compare revised transient reactive power afterwards, the direction according to revised transient reactive power carries out route selection, if revised
Transient reactive power is, then
；
If, then it represents that transient reactive power flows to the alternative outlet k of failure by bus, and the alternative outlet k of failure is sound
Circuit；If, then it represents that transient reactive power flows to bus by the alternative outlet k of failure, and the alternative outlet k of failure is failure
Circuit；If all circuits are satisfied by, then system is busbar grounding failure.
2. the distribution network fault line selection method in a kind of synthetic power-frequency according to claim 1 and transient reactive power direction,
It is characterized in that：The step（4）Middle selection T is a power frequency period.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108287286A (en) * | 2018-01-16 | 2018-07-17 | 济南置真电气有限公司 | A kind of polarity check method based on singlephase earth fault recorder data |
| CN109387732A (en) * | 2018-12-21 | 2019-02-26 | 云南电网有限责任公司电力科学研究院 | A kind of adaptive in-situ protection method and system of small current grounding fault |
| CN109387742A (en) * | 2018-11-06 | 2019-02-26 | 华中科技大学 | A kind of line fault recognition methods based on multiple spot active power monitoring and difference |
| CN109507525A (en) * | 2018-10-26 | 2019-03-22 | 国网江西省电力有限公司电力科学研究院 | A kind of earth-fault detecting method based on amendment transient reactive power method |
| CN110907758A (en) * | 2019-12-06 | 2020-03-24 | 国电南瑞科技股份有限公司 | Small current ground fault line selection method covering CT polarity self-correction |
| CN111766534A (en) * | 2020-06-07 | 2020-10-13 | 中车永济电机有限公司 | Traction converter ground fault detection method and device |
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| JPH08314559A (en) * | 1995-05-19 | 1996-11-29 | Nissin Electric Co Ltd | Rush current suppressor for transformer |
| CN1696722A (en) * | 2005-06-02 | 2005-11-16 | 昆明理工大学 | Malfunction route selection method for resonant grounded system based on current decomposition and wattles detection |
| CN102944813A (en) * | 2012-11-20 | 2013-02-27 | 中国石油大学(华东) | Resonant grounding system fault line selection method based on reactive power flow directions |
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2017
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH08314559A (en) * | 1995-05-19 | 1996-11-29 | Nissin Electric Co Ltd | Rush current suppressor for transformer |
| CN1696722A (en) * | 2005-06-02 | 2005-11-16 | 昆明理工大学 | Malfunction route selection method for resonant grounded system based on current decomposition and wattles detection |
| CN102944813A (en) * | 2012-11-20 | 2013-02-27 | 中国石油大学(华东) | Resonant grounding system fault line selection method based on reactive power flow directions |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108287286A (en) * | 2018-01-16 | 2018-07-17 | 济南置真电气有限公司 | A kind of polarity check method based on singlephase earth fault recorder data |
| CN108287286B (en) * | 2018-01-16 | 2023-03-14 | 济南置真电气有限公司 | Polarity verification method based on single-phase earth fault recording data |
| CN109507525A (en) * | 2018-10-26 | 2019-03-22 | 国网江西省电力有限公司电力科学研究院 | A kind of earth-fault detecting method based on amendment transient reactive power method |
| CN109387742A (en) * | 2018-11-06 | 2019-02-26 | 华中科技大学 | A kind of line fault recognition methods based on multiple spot active power monitoring and difference |
| CN109387732A (en) * | 2018-12-21 | 2019-02-26 | 云南电网有限责任公司电力科学研究院 | A kind of adaptive in-situ protection method and system of small current grounding fault |
| CN110907758A (en) * | 2019-12-06 | 2020-03-24 | 国电南瑞科技股份有限公司 | Small current ground fault line selection method covering CT polarity self-correction |
| CN110907758B (en) * | 2019-12-06 | 2021-10-22 | 国电南瑞科技股份有限公司 | Small current ground fault line selection method covering CT polarity self-correction |
| CN111766534A (en) * | 2020-06-07 | 2020-10-13 | 中车永济电机有限公司 | Traction converter ground fault detection method and device |
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