CN104950219B - The non-same famous prime minister's cross-line earth fault type diagnostic method of double-circuit line - Google Patents
The non-same famous prime minister's cross-line earth fault type diagnostic method of double-circuit line Download PDFInfo
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Abstract
The invention discloses a kind of non-same famous prime minister's cross-line earth fault type diagnostic methods of double-circuit line.The present invention calculates the zero-sequence current phase angle on double-circuit lines on the same pole road II loop line road, calculates the zero-sequence current on double-circuit lines on the same pole road II loop line road, calculates transition resistance；Then diagnosis criterion, the non-same famous prime minister's cross-line earth fault type of accurate judgement double-circuit line are constituted using transition resistance and set resistor.The method of the present invention only uses single-ended single back line electrical quantity, does not need to introduce another loop line road electrical quantity, diagnosis performance is not influenced by power system operation mode.The method of the present invention accurately calculates adjacent lines zero-sequence current using single-ended single back line electrical quantity, the influence of zero-sequence mutual inductance between line is considered in algorithm model, the influence of transition resistance and load current to diagnosis performance is eliminated, it can the non-same famous prime minister's cross-line earth fault type of accurate judgement double-circuit line.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System fields, concretely relate to a kind of non-same famous prime minister of double-circuit line
Cross-line earth fault type diagnostic method.
Background technique
Double-circuit lines on the same pole road is few with occupied area, cost is low, and connection operation of power networks is reliable and stable, it has also become
A kind of common transmission line of electricity connection type of electric system.Double-circuit lines on the same pole road running environment is complicated, and failure factor type is numerous
More, the failure factor for causing double-circuit lines on the same pole Lu Feitong famous prime minister's cross-line to be grounded has insulator arc-over, lightning stroke, floating material, fire
Burn mountain, villager burns the grass on waste land, route discharges moso bamboo to tree discharge, route, bird hangs grass and causes the alternate safe distance deficiency of route, bird
Outstanding grass causes safe distance deficiency etc. between route and ground wire.Earth fault type caused by different faults factor is different, substantially
Low resistance earthing, middle resistance eutral grounding and high resistance grounding three classes can be divided into.If a kind of double-circuit lines on the same pole Lu Feitong can be studied
Famous prime minister's cross-line through low middle high resistance grounding fault type diagnostic method, diagnosis performance not zero-sequence mutual inductance between by line, transition resistance and
The influence of load current accurately differentiates non-same famous prime minister's cross-line earth fault type, can effectively reduce failure factor range, in conjunction with
Fault localization result and distance protection action situation can be greatly improved failure line walking efficiency and shorten troubleshooting time, thus
Improve electric power netting safe running stability.
Summary of the invention
It is an object of the present invention to overcome the deficiencies of the prior art, and to provide zero sequence is not mutual between by line for a kind of diagnostic result
Sense, transition resistance and load current influence, the fault type diagnosis side suitable for the non-same famous prime minister's cross-line ground fault of double-circuit line
Method.
To complete above-mentioned purpose, the present invention adopts the following technical scheme:
The non-same famous prime minister's cross-line earth fault type diagnostic method of double-circuit line, which is characterized in that including following sequential steps:
(1) protector measuring double-circuit lines on the same pole road I returns the faulted phase voltage of route protection installation placeFailure
Phase currentAnd zero-sequence currentWherein, φ=I loop line road A phase, I loop line road B phase, I loop line road C phase；
(2) protective device calculates the zero-sequence current phase angle α on double-circuit lines on the same pole road II loop line road:
α=r1+r2-π-β
Wherein,
ZmFor the zero-sequence mutual inductance between double-circuit lines on the same pole road I loop line road and double-circuit lines on the same pole road II loop line road；ZI0For same bar
And the zero sequence impedance on frame double-circuit line I loop line road；ZI1For the positive sequence impedance on double-circuit lines on the same pole road I loop line road；φ=I loop line
Road A phase, I loop line road B phase, I loop line road C phase；For real part；For imaginary part；For real part；For void
Portion；For amplitude；For phase angle；For arcsin function value；For arcsine letter
Numerical value；J is complex operator.
(3) protective device calculates the zero-sequence current on double-circuit lines on the same pole road II loop line road
(4) protective device calculates transition resistanceWherein,
For leading angle, θ1=Arg (ZI1), it is double-circuit lines on the same pole road I loop line
Road positive sequence impedance ZI1Angle；It is leading
Angle；ZmFor the zero-sequence mutual inductance between double-circuit lines on the same pole road I loop line road and double-circuit lines on the same pole road II loop line road；ZI0
For the zero sequence impedance on double-circuit lines on the same pole road I loop line road；ZI1For the positive sequence impedance on double-circuit lines on the same pole road I loop line road；φ
=I loop line road A phase, I loop line road B phase, I loop line road C phase；
(5) protective device judges whether R >=200 are true, if so, then judge the non-same famous prime minister's cross-line of double-circuit line through high electricity
Hinder ground fault；Protective device judges whether 100≤R < 200 is true, if so, then judge the non-same famous prime minister's cross-line of double-circuit line
The resistance eutral grounding failure in；Protective device judges whether 0 < R < 100 is true, if so, then judge the non-same famous prime minister of double-circuit line
Cross-line is through low resistance grounding failure.
The features of the present invention and technological achievement:
The method of the present invention measures double-circuit lines on the same pole road I first and returns the faulted phase voltage of route protection installation place, failure
Phase current and zero-sequence current calculate the zero-sequence current phase angle on double-circuit lines on the same pole road II loop line road, calculate parallel lines on same tower double back
The zero-sequence current on route II loop line road calculates transition resistance；Then diagnosis criterion is constituted using transition resistance and set resistor, it is quasi-
Really judge the non-same famous prime minister's cross-line earth fault type of double-circuit line.The method of the present invention only uses single-ended single back line electrical quantity, no
Need to introduce another loop line road electrical quantity, diagnosis performance is not influenced by power system operation mode.The method of the present invention utilizes list
End single back line electrical quantity accurately calculates adjacent lines zero-sequence current, and the influence of zero-sequence mutual inductance between line is considered in algorithm model,
The influence of transition resistance and load current to diagnosis performance is eliminated, it can the non-same famous prime minister's cross-line ground connection event of accurate judgement double-circuit line
Hinder type.
Detailed description of the invention
Fig. 1 is using double-circuit lines on the same pole road transmission system schematic diagram of the invention.
Specific embodiment
Fig. 1 is using double-circuit lines on the same pole road transmission system schematic diagram of the invention.In Fig. 1 PT be voltage transformer,
CT is current transformer, and m, n are that the both ends on double-circuit lines on the same pole road are numbered.Protector measuring double-circuit lines on the same pole road I
Return the faulted phase voltage of route protection installation placeFaulted phase currentAnd zero-sequence currentWherein, φ=I loop line road A
Phase, I loop line road B phase, I loop line road C phase.
The zero-sequence current phase angle α on protective device calculating double-circuit lines on the same pole road II loop line road:
α=r1+r2-π-β
Wherein, ZmFor the zero sequence between double-circuit lines on the same pole road I loop line road and double-circuit lines on the same pole road II loop line road
Mutual inductance；ZI0For the zero sequence impedance on double-circuit lines on the same pole road I loop line road；ZI1For the positive sequence on double-circuit lines on the same pole road I loop line road
Impedance；φ=I loop line road A phase, I loop line road B phase, I loop line road C phase；For amplitude；For phase angle；For real part；For imaginary part；For real part；For imaginary part；r1、r2For intermediate variable, no physical significance, andFor arcsin function value；For arcsin function value.
The zero-sequence current on protective device calculating double-circuit lines on the same pole road II loop line roadIts
In, j is complex operator.
Protective device calculates double-circuit lines on the same pole road I loop line road positive sequence impedance ZI1Phase angle theta1=Arg (ZI1)。
Protective device calculatesLeading phase angle
Protective device calculates leadingPhase angle
Protective device calculates transition resistance
Protective device judges whether R >=200 are true, if so, then judge the non-same famous prime minister's cross-line of double-circuit line through high resistance
Ground fault.
Protective device judges whether 100≤R < 200 is true, if so, then judge in the non-same famous prime minister's cross-line warp of double-circuit line
Resistance eutral grounding failure.
Protective device judges whether 0 < R < 100 is true, if so, then judge the non-same famous prime minister's cross-line of double-circuit line through small electricity
Hinder ground fault.
Inventive method measures double-circuit lines on the same pole road I first and returns the faulted phase voltage of route protection installation place, failure phase
Electric current and zero-sequence current calculate the zero-sequence current phase angle on double-circuit lines on the same pole road II loop line road, calculate double-circuit lines on the same pole
The zero-sequence current on road II loop line road calculates transition resistance；Then diagnosis criterion is constituted using transition resistance and set resistor, accurately
Judge the non-same famous prime minister's cross-line earth fault type of double-circuit line.The method of the present invention only uses single-ended single back line electrical quantity, is not required to
Another loop line road electrical quantity is introduced, diagnosis performance is not influenced by power system operation mode.The method of the present invention utilizes single-ended
Single back line electrical quantity accurately calculates adjacent lines zero-sequence current, and the influence of zero-sequence mutual inductance between line is considered in algorithm model, is disappeared
Influence in addition to transition resistance and load current to diagnosis performance, can the non-same famous prime minister's cross-line ground fault of accurate judgement double-circuit line
Type.
The foregoing is merely preferred embodiments of the invention, but scope of protection of the present invention is not limited thereto, appoint
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of, all by what those familiar with the art
It is covered by the protection scope of the present invention.
Claims (1)
1. the non-same famous prime minister's cross-line earth fault type diagnostic method of double-circuit line, which is characterized in that including following sequential steps:
(1) protector measuring double-circuit lines on the same pole road I returns the faulted phase voltage of route protection installation placeFailure is mutually electric
StreamAnd zero-sequence currentWherein, φ=I loop line road A phase, I loop line road B phase, I loop line road C phase,
(2) protective device calculates the zero-sequence current phase angle α on double-circuit lines on the same pole road II loop line road:
α=r1+r2-π-β
Wherein,
ZmFor the zero-sequence mutual inductance between double-circuit lines on the same pole road I loop line road and double-circuit lines on the same pole road II loop line road；ZI0For same bar
And the zero sequence impedance on frame double-circuit line I loop line road；ZI1For the positive sequence impedance on double-circuit lines on the same pole road I loop line road；φ=I loop line
Road A phase, I loop line road B phase, I loop line road C phase；ForReal part；ForImaginary part；ForReal part；ForVoid
Portion；ForAmplitude；ForPhase angle；ForArcsin function value；ForArcsin function
Value；J is complex operator,
(3) protective device calculates the zero-sequence current on double-circuit lines on the same pole road II loop line road
(4) protective device calculates transition resistanceWherein,
ForIt is leadingAngle, θ1=Arg (ZI1), it is double-circuit lines on the same pole road I loop line
Road positive sequence impedance ZI1Angle；ForIt is leading
Angle；
(5) protective device judges whether R >=200 are true, if so, then judge that the non-same famous prime minister's cross-line of double-circuit line connects through high resistance
Earth fault；Protective device judges whether 100≤R < 200 is true, if so, then judge in the non-same famous prime minister's cross-line warp of double-circuit line
Resistance eutral grounding failure；Protective device judges whether 0 < R < 100 is true, if so, then judge the non-same famous prime minister's cross-line of double-circuit line
Through low resistance grounding failure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510336592.9A CN104950219B (en) | 2015-06-17 | 2015-06-17 | The non-same famous prime minister's cross-line earth fault type diagnostic method of double-circuit line |
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| CN201510336592.9A CN104950219B (en) | 2015-06-17 | 2015-06-17 | The non-same famous prime minister's cross-line earth fault type diagnostic method of double-circuit line |
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| CN104950219B true CN104950219B (en) | 2019-03-08 |
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| CN113064022B (en) * | 2021-03-12 | 2022-04-29 | 国网河南省电力公司电力科学研究院 | Line protection method based on transition resistance calculation |
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| JPH02116763A (en) * | 1988-10-27 | 1990-05-01 | Meidensha Corp | Fault point locator |
| CN102707197B (en) * | 2012-06-11 | 2014-07-09 | 国家电网公司 | Distance measuring method and type diagnostic method of single-phase grounding fault of electric transmission line |
| CN103760407B (en) * | 2014-02-18 | 2016-06-08 | 国家电网公司 | The non-same famous prime minister's cross-line earth fault voltage magnitude of double-circuit line and phase angle measurement method |
| CN104049182B (en) * | 2014-07-09 | 2016-08-24 | 国家电网公司 | Double-circuit lines on the same pole road singlephase earth fault type diagnostic method |
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