CN104950220B - Double-circuit lines on the same pole road singlephase earth fault method of single end distance measurement is realized using single back line single-end electrical quantity - Google Patents
Double-circuit lines on the same pole road singlephase earth fault method of single end distance measurement is realized using single back line single-end electrical quantity Download PDFInfo
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Abstract
The invention discloses a kind of double-circuit lines on the same pole road singlephase earth fault method of single end distance measurement is realized using single back line single-end electrical quantity.The present invention uses linear search method, since double-circuit lines on the same pole road I goes back to route protection installation place, it is incremented by successively with fixed step size, the phase angle of the leading failure phase negative-sequence current of operation voltage of double-circuit lines on the same pole road I loop lines road every bit is calculated successively, until double-circuit lines on the same pole road I returns total track length, the phase corner of the leading failure phase negative-sequence current of operation voltage at certain point is chosen at (0 °, 180 °) in the range of, and at its adjacent subsequent point the leading failure phase negative-sequence current of operation voltage phase corner at (180 °, 360 °) in the range of, then this 2 points centre position is trouble point.Influence of the zero-sequence mutual inductance to double-circuit lines on the same pole road singlephase earth fault single end distance measurement precision between line is eliminated in the influence of zero-sequence mutual inductance between the method for the present invention meter and line.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System fields, concretely relate to a kind of single-ended using single back line
Electrical quantity realizes double-circuit lines on the same pole road singlephase earth fault method of single end distance measurement.
Background technology
It is divided from electrical quantity used in ranging, the method for fault localization can be divided into two major class：Both-end distance measuring and single end distance measurement.
Two-terminal Fault Location method is the method for determining transmission line malfunction position using transmission line of electricity both ends electrical quantity, it is needed by logical
Road obtains opposite end electrical quantity, therefore strong to the dependence of channel, is also easily influenced in actual use by both-end sampling value synchronization.
Single end distance measurement method is that a kind of method of transmission line malfunction position is determined merely with the voltage and current data of transmission line of electricity one end, by
An end data is only needed in it, without communication and data synchronizer, operating cost is low and algorithmic stability, therefore in mesolow line
It is widely applied in road.At present, method of single end distance measurement is broadly divided into two classes, and one kind is traveling wave method, and another kind of is impedance
Method.Traveling wave method carries out ranging using the transmission property of fault transient travelling wave, and precision is high, not by shadows such as the method for operation, excessive resistances
It rings, but very high to sample rate requirement, needs special wave recording device, do not obtain substantive application at present.Impedance method utilizes event
Voltage, the magnitude of current after barrier calculate the impedance of fault loop, carry out ranging according to the line length characteristic directly proportional to impedance, survey
It is simple and reliable away from principle, but applied to double-circuit lines on the same pole road singlephase earth fault one-end fault ranging when, range accuracy by
It is influenced to zero-sequence mutual inductance between trouble point transition resistance and line serious.There are zero-sequence mutual inductance, zero sequences between double-circuit lines on the same pole route
Mutual inductance can have an impact zero-utility theory, and then lead to impedance method distance measurement result bigger error.If double-circuit lines on the same pole
Single-phase high-impedance occurs for road, and zero-sequence mutual inductance and high transition resistance combined influence between by line, impedance method distance measurement result is usually
Beyond total track length or without distance measurement result, accurate fault location information can not be provided, causes line fault line walking difficult, it is unfavorable
It is quickly discharged and the fast quick-recovery of line powering in failure.
Invention content
It is an object of the present invention to overcome the deficiencies of the prior art, and to provide a kind of measurement accuracy, zero sequence is not mutual between by line
What the factors such as sense, load current, transition resistance and abort situation influenced realizes parallel lines on same tower using single back line single-end electrical quantity
Double-circuit line singlephase earth fault method of single end distance measurement.
To complete above-mentioned purpose, the present invention adopts the following technical scheme that：
Double-circuit lines on the same pole road singlephase earth fault method of single end distance measurement is realized using single back line single-end electrical quantity,
It 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 currentFailure phase negative-sequence currentAnd zero-sequence currentWherein, φ=I loop lines road A phases, I loop lines road B phases, I loop lines
Road C phases；
(2) it is l that protective device, which chooses fault distance initial value,x, the zero sequence on calculating double-circuit lines on the same pole road II loop lines road
Electric current
Wherein, Zm0The zero sequence system equivalent impedance of installation place is protected for this side of double-circuit lines on the same pole road I loop lines road；Zn0
The zero sequence system equivalent impedance of installation place is protected for double-circuit lines on the same pole road I loop lines road offside；ZmFor double-circuit lines on the same pole
Zero-sequence mutual inductance between road I loop lines road and double-circuit lines on the same pole road II loop lines road；L is double-circuit lines on the same pole road I loop lines road
Length；ZI0Zero sequence impedance for double-circuit lines on the same pole road I loop lines road；
(3) it calculates and returns route protection installation place l away from double-circuit lines on the same pole road IxThe operation voltage of point
Wherein, ZI0Zero sequence impedance for double-circuit lines on the same pole road I loop lines road；ZI1For double-circuit lines on the same pole road I loop lines
The positive sequence impedance on road；φ=I loop lines road A phases, I loop lines road B phases, I loop lines road C phases；ZmFor double-circuit lines on the same pole road I loop lines road
With the zero-sequence mutual inductance between the II loop lines road of double-circuit lines on the same pole road；L returns line length for double-circuit lines on the same pole road I；
(4) it calculates and returns route protection installation place l away from double-circuit lines on the same pole road IxThe operation voltage of pointLeading failure
Phase negative-sequence currentPhase angle theta (lx)；Wherein, φ=I loop lines road A phases, I loop lines road B phases, I loop lines road C phases；
(5) fault distance initial value lxIt is incremented by with fixed step size Δ l, return to step (2), calculates parallel lines on same tower double back successively
The operation voltage of circuit I loop lines road every bitLeading failure phase negative-sequence currentPhase angle theta (lx), until with bar simultaneously
Frame double-circuit line I returns total track length；Wherein, fixed step size Δ l takes 0.001l, and l is long for double-circuit lines on the same pole road I loop lines road
Degree；
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 and returns the faulted phase voltage of route protection installation place, failure first
Phase current, failure phase negative-sequence current and zero-sequence current return the failure phase of route protection installation place using double-circuit lines on the same pole road I
Electrical quantity calculates the zero-sequence current on double-circuit lines on the same pole road II loop lines road, then using linear search method, from parallel lines on same tower
Double-circuit line I goes back to route protection installation place and starts, incremented by successively with fixed step size, calculates double-circuit lines on the same pole road I successively and returns
The phase angle of the leading failure phase negative-sequence current of the operation voltage of every bit on circuit, until double-circuit lines on the same pole road I loop lines road is complete
Long, the phase corner for choosing the leading failure phase negative-sequence current of operation voltage at the I loop lines road certain point of double-circuit lines on the same pole road exists
In the range of (0 °, 180 °), and at its adjacent subsequent point the leading failure phase negative-sequence current of operation voltage phase corner (180 °,
360 °) in the range of, this 2 points centre position is trouble point.The influence of zero-sequence mutual inductance between the method for the present invention meter and line is eliminated
Influence of the zero-sequence mutual inductance to double-circuit lines on the same pole road singlephase earth fault single end distance measurement precision between line；The method of the present invention algorithm mould
The influence of Single-phase Ground Connection Failure voltage is considered in type, eliminates transition resistance to double-circuit lines on the same pole road singlephase earth fault
The influence of single end distance measurement precision has very high range accuracy.
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 currentFailure phase negative-sequence currentAnd zero-sequence current
Wherein, φ=I loop lines road A phases, I loop lines road B phases, I loop lines road C phases.
It is l that protective device, which chooses fault distance initial value,x, the zero-sequence current on calculating double-circuit lines on the same pole road II loop lines road
Wherein, Zm0The zero sequence system equivalent impedance of installation place is protected for this side of double-circuit lines on the same pole road I loop lines road；Zn0
The zero sequence system equivalent impedance of installation place is protected for double-circuit lines on the same pole road I loop lines road offside；ZmFor double-circuit lines on the same pole
Zero-sequence mutual inductance between road I loop lines road and double-circuit lines on the same pole road II loop lines road；L is double-circuit lines on the same pole road I loop lines road
Length；ZI0Zero sequence impedance for double-circuit lines on the same pole road I loop lines road.
It calculates and returns route protection installation place l away from double-circuit lines on the same pole road IxThe operation voltage of point
Wherein, ZI0Zero sequence impedance for double-circuit lines on the same pole road I loop lines road；ZI1For double-circuit lines on the same pole road I loop lines
The positive sequence impedance on road；φ=I loop lines road A phases, I loop lines road B phases, I loop lines road C phases；ZmFor double-circuit lines on the same pole road I loop lines road
With the zero-sequence mutual inductance between the II loop lines road of double-circuit lines on the same pole road；L returns line length for double-circuit lines on the same pole road I.
It calculates and returns route protection installation place l away from double-circuit lines on the same pole road IxThe operation voltage of pointLeading failure phase
Negative-sequence currentPhase angleWherein, φ=I loop lines road A phases, I loop lines road B phases, I loop lines road C phases.
Fault distance initial value lxIt is incremented by with fixed step size Δ l, it is every calculates double-circuit lines on the same pole road I loop lines road successively
The operation voltage of a bitLeading failure phase negative-sequence currentPhase angle theta (lx), until double-circuit lines on the same pole road I is returned
Total track length；Wherein, fixed step size Δ l takes 0.001l, l to return line length for double-circuit lines on the same pole road I.
The method of the present invention measures double-circuit lines on the same pole road I and returns the faulted phase voltage of route protection installation place, failure first
Phase current, failure phase negative-sequence current and zero-sequence current return the failure phase of route protection installation place using double-circuit lines on the same pole road I
Electrical quantity calculates the zero-sequence current on double-circuit lines on the same pole road II loop lines road, then using linear search method, from parallel lines on same tower
Double-circuit line I goes back to route protection installation place and starts, incremented by successively with fixed step size, calculates double-circuit lines on the same pole road I successively and returns
The phase angle of the leading failure phase negative-sequence current of the operation voltage of every bit on circuit, until double-circuit lines on the same pole road I loop lines road is complete
Long, the phase corner for choosing the leading failure phase negative-sequence current of operation voltage at the I loop lines road certain point of double-circuit lines on the same pole road exists
In the range of (0 °, 180 °), and at its adjacent subsequent point the leading failure phase negative-sequence current of operation voltage phase corner (180 °,
360 °) in the range of, then this 2 points centre position is double-circuit lines on the same pole road I loop lines road Single-phase Ground Connection Failure.This hair
The influence of zero-sequence mutual inductance between bright method meter and line, zero-sequence mutual inductance is to double-circuit lines on the same pole road singlephase earth fault list between eliminating line
Hold the influence of range accuracy；The influence of Single-phase Ground Connection Failure voltage is considered in the method for the present invention algorithm model, eliminates transition
Influence of the resistance to double-circuit lines on the same pole road singlephase earth fault single end distance measurement precision has very high range accuracy.
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. realize double-circuit lines on the same pole road singlephase earth fault method of single end distance measurement using single back line single-end electrical quantity, it is special
Sign is, 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
StreamFailure phase negative-sequence currentAnd zero-sequence currentWherein, φ=I loop lines road A phases, I loop lines road B phases, I loop lines road C phases；
(2) it is l that protective device, which chooses fault distance initial value,x, the zero-sequence current on calculating double-circuit lines on the same pole road II loop lines road
Wherein, Zm0The zero sequence system equivalent impedance of installation place is protected for this side of double-circuit lines on the same pole road I loop lines road；Zn0For same bar
And the zero sequence system equivalent impedance of frame double-circuit line I loop lines road offside protection installation place；ZmFor double-circuit lines on the same pole road I loop lines
Zero-sequence mutual inductance between road and double-circuit lines on the same pole road II loop lines road；L returns line length for double-circuit lines on the same pole road I；ZI0
Zero sequence impedance for double-circuit lines on the same pole road I loop lines road；
(3) it calculates and returns route protection installation place l away from double-circuit lines on the same pole road IxThe operation voltage of point
Wherein, ZI1Positive sequence impedance for double-circuit lines on the same pole road I loop lines road；
(4) it calculates and returns route protection installation place l away from double-circuit lines on the same pole road IxThe operation voltage of pointLeading failure is mutually born
Sequence electric currentPhase angle theta (lx)；
(5) fault distance initial value lxIt is incremented by with fixed step size Δ l, return to step (2), calculates double-circuit lines on the same pole road I successively
The operation voltage of loop line road every bitLeading failure phase negative-sequence currentPhase angle theta (lx), until parallel lines on same tower is double
Loop line road I returns total track length；Wherein, fixed step size Δ l takes 0.001l；
(6) a certain l in double-circuit lines on the same pole road I loop lines road is chosenxOperation voltage at pointLeading failure phase negative-sequence currentPhase angle theta (lx) fall in the range of (0 °, 180 °), and operation voltage at its adjacent subsequent pointLeading failure phase
Negative-sequence currentPhase angle theta (lx+ Δ l) is fallen in the range of (180 °, 360 °), then this 2 points centre position be with bar simultaneously
Frame double-circuit line I loop lines road Single-phase Ground Connection Failure；Wherein,
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| CN201510336606.7A CN104950220B (en) | 2015-06-17 | 2015-06-17 | Double-circuit lines on the same pole road singlephase earth fault method of single end distance measurement is realized using single back line single-end electrical quantity |
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| CN201510336606.7A CN104950220B (en) | 2015-06-17 | 2015-06-17 | Double-circuit lines on the same pole road singlephase earth fault method of single end distance measurement is realized using single back line single-end electrical quantity |
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| CN106981861B (en) * | 2016-01-19 | 2020-01-17 | 中国电力科学研究院 | Method for preventing misoperation in longitudinal fault zero-sequence longitudinal protection of double-circuit lines on same tower |
| CN109490687A (en) * | 2018-10-31 | 2019-03-19 | 南京国电南自电网自动化有限公司 | One kind is based on failure phase angle and the polar single-phase earth fault detecting method of transient current |
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| CN104035005A (en) * | 2014-07-04 | 2014-09-10 | 国家电网公司 | Double-circuit line non-same-phase overline earth fault locating method |
| CN104035006A (en) * | 2014-07-04 | 2014-09-10 | 国家电网公司 | Double-circuit line non-in-phase cross-line earth fault judgment method based on trigonometric function |
| CN104052035A (en) * | 2014-07-09 | 2014-09-17 | 国家电网公司 | Same-tower double-circuit line single-phase grounded reactance relay |
| CN104062553A (en) * | 2014-07-09 | 2014-09-24 | 国家电网公司 | Same-tower-double-circuit double-circuit line single-phase earth fault single-end distance measurement method |
| CN104090210A (en) * | 2014-07-15 | 2014-10-08 | 国家电网公司 | Different-phase cross-line ground fault single-terminal location method for double-circuit lines |
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| EP2113778B1 (en) * | 2008-04-29 | 2017-12-06 | ABB Schweiz AG | System and method for determining location of phase-to-phase fault or three-phase fault |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104035005A (en) * | 2014-07-04 | 2014-09-10 | 国家电网公司 | Double-circuit line non-same-phase overline earth fault locating method |
| CN104035006A (en) * | 2014-07-04 | 2014-09-10 | 国家电网公司 | Double-circuit line non-in-phase cross-line earth fault judgment method based on trigonometric function |
| CN104052035A (en) * | 2014-07-09 | 2014-09-17 | 国家电网公司 | Same-tower double-circuit line single-phase grounded reactance relay |
| CN104062553A (en) * | 2014-07-09 | 2014-09-24 | 国家电网公司 | Same-tower-double-circuit double-circuit line single-phase earth fault single-end distance measurement method |
| CN104090210A (en) * | 2014-07-15 | 2014-10-08 | 国家电网公司 | Different-phase cross-line ground fault single-terminal location method for double-circuit lines |
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