CN104950210B - Based on the non-same famous prime minister's cross-line ground fault recognition method of virtual impedance imaginary part amplitude characteristic double-circuit line - Google Patents
Based on the non-same famous prime minister's cross-line ground fault recognition method of virtual impedance imaginary part amplitude characteristic double-circuit line Download PDFInfo
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Abstract
The invention discloses one kind to be based on the non-same famous prime minister's cross-line ground fault recognition method of virtual impedance imaginary part amplitude characteristic double-circuit line.The method of the present invention calculates the imaginary part of the virtual impedance at the non-same famous prime minister's cross-line earth fault of double-circuit line, calculate the imaginary part of the virtual impedance at the protection seting range of double-circuit lines on the same pole road I loop lines road, whether the imaginary part amplitude for being less than the virtual impedance at the protection seting range of double-circuit lines on the same pole road I loop lines road by the imaginary part amplitude for judging the virtual impedance at the non-same famous prime minister's cross-line earth fault of double-circuit line is true, to decide whether to send out action trip signal, zero-sequence mutual inductance between line is eliminated in principle, transition resistance, influence of the factors such as load current and power system operation mode to fault distinguishing result, protect positive direction outlet that unprotect dead zone during double-circuit line non-same famous prime minister's cross-line earth fault occurs, negative direction outlet is protected to occur not malfunction during the non-same famous prime minister's cross-line earth fault of double-circuit line.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System fields, concretely relate to a kind of based on virtual impedance imaginary part
The non-same famous prime minister's cross-line ground fault recognition method of amplitude characteristic double-circuit line.
Background technology
Double-circuit lines on the same pole road has that floor space is few, 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 mode of electric system.There are zero-sequence mutual inductance, zero-sequence mutual inductances pair between double-circuit lines on the same pole route
Zero-utility theory has an impact, and then generates additional impedance, and the additional impedance caused by zero-sequence mutual inductance can lead to protective device
The fault impedance measured is more than physical fault impedance, causes in the protection zone of double-circuit lines on the same pole road close to protection seting range
When earth fault occurs for place, protection malfunctions, unfavorable to power network safety operation.
Even if double-circuit lines on the same pole road occurs to be directly grounded failure through shaft tower, in soil resistivity lower ground area's transition
Resistance is also near 10 Ω；In the higher local transition resistance of resistivity up to 30 Ω or even higher.Transition resistance is not zero
So that the fault impedance that protective device is calculated further comprises in addition to the fault impedance component comprising reaction true fault distance
The additional impedance generated due to transition resistance.The additional impedance that transition resistance generates connects in resistance sense or be easy to cause in capacitance-resistance
Ground impedance distance protection tripping or steady-state.False protection or tripping can bring great damage to safe operation of power system
It loses, it could even be possible to the stability of electric system can be threatened.
Acting characteristic round edge circle of existing double-circuit lines on the same pole road ground distance protection passes through coordinate origin, due to coordinate
Origin is located on acting characteristic round edge circle, when protecting positive outlet earth fault protection there are dead zone, and with transition resistance and
Load current increases, and protects positive outlet dead zone bigger.Since coordinate origin is located on acting characteristic round edge circle, negative direction is protected
Possibility of the earth fault there are malfunction is exported, and transition resistance is bigger, protection is easier when protection negative direction exports earth fault
Malfunction.
Due to there is very strong zero-sequence mutual inductance between double-circuit lines on the same pole route, existing ground distance protection can not obtain separately
The zero-sequence current on one loop line road can not eliminate the influence of zero-sequence mutual inductance between line in algorithm model, and zero-sequence mutual inductance is influenced between by line,
Traditional ground distance protection, which will be applied to double-circuit lines on the same pole Lu Shiqi protection domains, to be expanded significantly, at protection seting range
Failure is usually present steady-state so that is easily malfunctioned during protection external area error, be easy to cause the big transfer of trend, caused
Large area blackout occurs.
Invention content
It is an object of the present invention to overcome the deficiencies of the prior art, and to provide one kind is special based on virtual impedance imaginary part amplitude
Property the non-same famous prime minister's cross-line ground fault recognition method of double-circuit line, between this method meter and line zero-sequence mutual inductance influence calculate zero sequence mend
Electric current is repaid, calculates the imaginary part of the virtual impedance at the non-same famous prime minister's cross-line earth fault of double-circuit line, calculates parallel lines on same tower double back
The imaginary part of virtual impedance at the protection seting range of circuit I loop lines road, by judging that the non-same famous prime minister's cross-line of double-circuit line is grounded event
The imaginary part amplitude of virtual impedance at barrier point is less than the virtual impedance at the protection seting range of double-circuit lines on the same pole road I loop lines road
Imaginary part amplitude it is whether true, to decide whether to send out action trip signal, zero-sequence mutual inductance between line, transition electricity are eliminated in principle
The influences of the factors to fault distinguishing result such as resistance, load current and power system operation mode, the outlet of protection positive direction occur double
The non-same famous prime minister's cross-line of double-circuit line occurs for unprotect dead zone during loop line Lu Feitong famous prime minister's cross-line earth fault, the outlet of protection negative direction
It is not malfunctioned during earth fault, suitable for the single-end electrical quantity back-up protection of double-circuit lines on the same pole road.
To complete above-mentioned purpose, the present invention adopts the following technical scheme that：
Based on the non-same famous prime minister's cross-line ground fault recognition method of virtual impedance imaginary part amplitude characteristic double-circuit line, feature exists
In 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 lines road A phases, I loop lines road B phases, I loop lines road C phases；
(2) protective device calculates the zero sequence compensation electric current on double-circuit lines on the same pole road I loop lines road
(3) protective device calculates the imaginary part of the virtual impedance at the non-same famous prime minister's cross-line earth fault of double-circuit line
(4) protective device calculates l at the protection seting range of double-circuit lines on the same pole road I loop lines roadsetThe virtual impedance of point
Imaginary part
Wherein, l returns line length for double-circuit lines on the same pole road I；ZmFor double-circuit lines on the same pole road I loop line Lu Yutong bars
And the zero-sequence mutual inductance between frame double-circuit line II loop lines road；ZI0Zero sequence impedance for double-circuit lines on the same pole road I loop lines road；ZI1
Positive sequence impedance for double-circuit lines on the same pole road I loop lines road；lsetFor double-circuit lines on the same pole road I loop lines road protection seting range,
0.85 times of double-circuit lines on the same pole road I is taken to return line length；
(5) protective device judges the imaginary part amplitude of the virtual impedance at the non-same famous prime minister's cross-line earth fault of double-circuit lineLess than double-circuit lines on the same pole road I loop lines road protection seting model
Enclose place lsetThe imaginary part amplitude of the virtual impedance of point | λ (lset) | it is whether true, if so, then judge the non-same famous prime minister of double-circuit line across
Line earth fault is located within the scope of the protection seting of double-circuit lines on the same pole road I loop lines road, and protective device sends out action tripping
Signal.
The features of the present invention and technological achievement：
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, differentiates knot
Fruit is not influenced by power system operation mode, still has very high failure when larger change occurs for power system operation mode
Discriminant accuracy.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, protection
Secondary circuit is not gone here and there mutually independently of each other, enhances fault distinguishing result accuracy.The method of the present invention is by judging that double-circuit line is non-same
The imaginary part amplitude of virtual impedance at famous prime minister's cross-line earth fault is less than double-circuit lines on the same pole road I loop lines road protection seting model
Whether the imaginary part amplitude for enclosing the virtual impedance at place is true, to decide whether to send out action trip signal, is eliminated in principle between line
Influence of the factors such as zero-sequence mutual inductance, transition resistance, load current and power system operation mode to fault distinguishing result, protection is just
Unprotect dead zone during double-circuit line non-same famous prime minister's cross-line earth fault occurs for direction outlet, and double loop occurs for the outlet of protection negative direction
It is not malfunctioned during Lu Feitong famous prime minister's cross-line earth fault, suitable for the single-end electrical quantity back-up protection of double-circuit lines on the same pole road.
Description of the drawings
Fig. 1 is the double-circuit lines on the same pole road transmission system schematic diagram using the present invention.
Specific embodiment
Fig. 1 is the double-circuit lines on the same pole road transmission system schematic diagram using the present invention.In Fig. 1 PT for 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 is separate for failure,
φ=I loop lines road A phases, I loop lines road B phases, I loop lines road C phases.
Protective device calculates the zero sequence compensation electric current on double-circuit lines on the same pole road I loop lines road
Protective device calculates the imaginary part of the virtual impedance at the non-same famous prime minister's cross-line earth fault of double-circuit line
Protective device calculates l at the protection seting range of double-circuit lines on the same pole road I loop lines roadsetThe void of the virtual impedance of point
Portion
Wherein, l returns line length for double-circuit lines on the same pole road I；ZmFor double-circuit lines on the same pole road I loop line Lu Yutong bars
And the zero-sequence mutual inductance between frame double-circuit line II loop lines road；ZI0Zero sequence impedance for double-circuit lines on the same pole road I loop lines road；ZI1
Positive sequence impedance for double-circuit lines on the same pole road I loop lines road；lsetFor double-circuit lines on the same pole road I loop lines road protection seting range,
0.85 times of double-circuit lines on the same pole road I is taken to return line length；J is complex operator.
If the non-same famous prime minister's cross-line earth fault of double-circuit line is located at double-circuit lines on the same pole road I loop lines road protection seting model
Within enclosing, then the imaginary part amplitude of the virtual impedance at the non-same famous prime minister's cross-line earth fault of double-circuit line is less than parallel lines on same tower double back
L at the protection seting range of circuit I loop lines roadsetThe imaginary part amplitude of the virtual impedance of point.If the non-same famous prime minister's cross-line ground connection of double-circuit line
Trouble point is located at except the protection seting range of double-circuit lines on the same pole road I loop lines road, then the non-same famous prime minister's cross-line ground connection of double-circuit line
The imaginary part amplitude of the virtual impedance of fault point is more than l at the protection seting range of double-circuit lines on the same pole road I loop lines roadsetPoint
The imaginary part amplitude of virtual impedance.The non-same famous prime minister's cross-line earth fault of double-circuit line is proposed using this virtual impedance imaginary part amplitude characteristic
Identical criterion：
Protective device judges the imaginary part amplitude of the virtual impedance at the non-same famous prime minister's cross-line earth fault of double-circuit lineLess than double-circuit lines on the same pole road I loop lines road protection seting model
Enclose place lsetThe imaginary part amplitude of the virtual impedance of point | λ (lset) | it is whether true, if so, then judge the non-same famous prime minister of double-circuit line across
Line earth fault is located within the scope of the protection seting of double-circuit lines on the same pole road I loop lines road, and protective device sends out action tripping
Signal.
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, differentiates knot
Fruit is not influenced by power system operation mode, still has very high failure when larger change occurs for power system operation mode
Discriminant accuracy.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, protection
Secondary circuit is not gone here and there mutually independently of each other, enhances fault distinguishing result accuracy.The method of the present invention is by judging that double-circuit line is non-same
The imaginary part amplitude of virtual impedance at famous prime minister's cross-line earth fault is less than double-circuit lines on the same pole road I loop lines road protection seting model
Whether the imaginary part amplitude for enclosing the virtual impedance at place is true, to decide whether to send out action trip signal, is eliminated in principle between line
Influence of the factors such as zero-sequence mutual inductance, transition resistance, load current and power system operation mode to fault distinguishing result, protection is just
Unprotect dead zone during double-circuit line non-same famous prime minister's cross-line earth fault occurs for direction outlet, and double loop occurs for the outlet of protection negative direction
It is not malfunctioned during Lu Feitong famous prime minister's cross-line earth fault, suitable for the single-end electrical quantity back-up protection of double-circuit lines on the same pole road.
The foregoing is merely the preferred embodiment of the present invention, but protection scope of the present invention is not limited thereto, and is appointed
What those familiar with the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in, all
It is covered by the protection scope of the present invention.
Claims (1)
1. based on the non-same famous prime minister's cross-line ground fault recognition method of virtual impedance imaginary part amplitude characteristic double-circuit line, feature exists
In 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 lines road A phases, I loop lines road B phases, I loop lines road C phases；
(2) protective device calculates the zero sequence compensation electric current on double-circuit lines on the same pole road I loop lines road
Wherein,
ZmFor the zero-sequence mutual inductance between double-circuit lines on the same pole road I loop lines road and double-circuit lines on the same pole road II loop lines road；ZI0For same bar
And the zero sequence impedance on frame double-circuit line I loop lines road；ZI1Positive sequence impedance for double-circuit lines on the same pole road I loop lines road；
ForReal part；ForImaginary part；ForReal part；ForImaginary part；ForAmplitude；ForPhase angle；ForArcsin function value；
ForArcsin function value；J is complex operator；
(3) protective device calculates the imaginary part of the virtual impedance at the non-same famous prime minister's cross-line earth fault of double-circuit line
(4) protective device calculates l at the protection seting range of double-circuit lines on the same pole road I loop lines roadsetThe imaginary part of the virtual impedance of point
Wherein, l returns line length for double-circuit lines on the same pole road I；lsetFor double-circuit lines on the same pole road I loop lines road protection seting
Range takes 0.85 times of double-circuit lines on the same pole road I to return line length；
(5) protective device judges the imaginary part amplitude of the virtual impedance at the non-same famous prime minister's cross-line earth fault of double-circuit lineLess than double-circuit lines on the same pole road I loop lines road protection seting range
Locate lsetThe imaginary part amplitude of the virtual impedance of point | λ (lset) | it is whether true, if so, then judge the non-same famous prime minister's cross-line of double-circuit line
Earth fault is located within the scope of the protection seting of double-circuit lines on the same pole road I loop lines road, and protective device sends out action tripping letter
Number.
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| CN111463794B (en) * | 2020-04-29 | 2021-07-30 | 山东大学 | Transmission and distribution network cooperative power flow control method and system with additional earth impedance |
| CN113659546B (en) * | 2021-08-19 | 2023-08-08 | 国网湖南省电力有限公司 | Zero sequence direction element compensation method and system for double-circuit line power supply system |
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|---|---|---|---|---|
| US20090267611A1 (en) * | 2008-04-29 | 2009-10-29 | Abb Technology Ag | Apparatus and method for determining location of phase-to-phase fault or three-phase fault |
| CN103293439A (en) * | 2013-05-19 | 2013-09-11 | 国家电网公司 | Single-terminal distance measurement method for line single-phase earth faults based on distributed parameter measurement impedance amplitude characteristics |
| CN103762560A (en) * | 2014-02-18 | 2014-04-30 | 国家电网公司 | Double-circuit line non-same-name-phase overline grounded reactance distance protection method |
| CN104049180A (en) * | 2014-07-04 | 2014-09-17 | 国家电网公司 | Double-circuit line non-in-phase jumper wire earth fault single-end distance measurement method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090267611A1 (en) * | 2008-04-29 | 2009-10-29 | Abb Technology Ag | Apparatus and method for determining location of phase-to-phase fault or three-phase fault |
| CN103293439A (en) * | 2013-05-19 | 2013-09-11 | 国家电网公司 | Single-terminal distance measurement method for line single-phase earth faults based on distributed parameter measurement impedance amplitude characteristics |
| CN103762560A (en) * | 2014-02-18 | 2014-04-30 | 国家电网公司 | Double-circuit line non-same-name-phase overline grounded reactance distance protection method |
| CN104049180A (en) * | 2014-07-04 | 2014-09-17 | 国家电网公司 | Double-circuit line non-in-phase jumper wire earth fault single-end distance measurement method |
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