CN103869220B - Based on directly adopting straight jumping communication mode double-circuit line method for locating single-phase ground fault - Google Patents

Based on directly adopting straight jumping communication mode double-circuit line method for locating single-phase ground fault Download PDF

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CN103869220B
CN103869220B CN201410060245.3A CN201410060245A CN103869220B CN 103869220 B CN103869220 B CN 103869220B CN 201410060245 A CN201410060245 A CN 201410060245A CN 103869220 B CN103869220 B CN 103869220B
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phase
road
amp
fault
loop line
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CN201410060245.3A
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CN103869220A (en
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林富洪
曾惠敏
陈文景
徐致远
李振华
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国家电网公司
国网福建省电力有限公司
国网福建省电力有限公司莆田供电公司
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Abstract

The invention discloses a kind of based on directly adopting straight jumping communication mode double-circuit line method for locating single-phase ground fault, the method is measured fault phase voltage, fault phase electric current, the zero-sequence current on the I loop line road of protection installation place, double-circuit line on same pole road, measure other two normal phases voltage, measure II loop line road zero-sequence current, the fault phase voltage while utilizing two normal phase voltage calculation I loop line roads, I loop line road normally to move; From protection installation place, double-circuit line on same pole road; the phase angle of the fault phase voltage when increasing progressively the leading I loop line of the fault phase voltage road of calculating successively every bit on I loop line road and normally move with fixed step size, utilizes voltage ratio phase phase angle before and after trouble point that the accurate location that step evolution changes this characteristic and realizes double-circuit line singlephase earth fault can occur. The present invention, without voltage before line fault is remembered, keeps loop without voltage before line fault is set; Eliminate the impact of zero-sequence mutual inductance on fault localization precision between transition resistance, load current and line.

Description

Based on directly adopting straight jumping communication mode double-circuit line method for locating single-phase ground fault

Technical field

The present invention relates to Relay Protection Technology in Power System field, specifically relate to a kind of two based on directly adopting straight jumping communication modeLoop line road method for locating single-phase ground fault.

Background technology

Divide from the electric parameters used of finding range, the method for fault localization can be divided into two large classes: both-end distance measuring and single end distance measurement. Both-endFault locating methods is to utilize transmission line of electricity two ends electric parameters to determine the method for transmission line malfunction position, and it need to obtain by passageOpposite end electric parameters, therefore strong to the dependence of passage, reality is also subject to the impact of both-end sampling value synchronization in using. Single-ended surveyOnly to utilize the electric current and voltage data of transmission line of electricity one end to determine a kind of method of transmission line malfunction position apart from method, because it only needsWant an end data, need not communication and data synchronizer, operating cost is low and algorithm stable, therefore in mid & low-voltage line, obtainsWidely application. At present, method of single end distance measurement is mainly divided into two classes, and a class is traveling wave method, and another kind of is impedance method. Row rippleMethod utilizes the transmission character of fault transient travelling wave to find range, and precision is high, not affected by the method for operation, excessive resistance etc., but rightSample rate requires very high, needs special wave recording device, does not obtain at present substantial application. Impedance method is utilized the electricity after faultThe impedance of press, the magnitude of current calculating fault loop, the characteristic being directly proportional to impedance according to line length is found range, range measurement principle letterSingle reliable, but while being applied to analyses for double circuits on same tower singlephase earth fault one-end fault ranging, range accuracy is subject to trouble point mistakeCrossing zero-sequence mutual inductance between resistance and line affects serious. Between analyses for double circuits on same tower line, have zero-sequence mutual inductance, zero-sequence mutual inductance can be to zero sequencePenalty coefficient exerts an influence, and then causes impedance method range finding resultant error bigger than normal. If there is single-phase height in analyses for double circuits on same towerResistance earth fault, is subject to zero-sequence mutual inductance and high transition resistance combined influence between line, impedance method range finding result usually exceed total track length orWithout range finding result, abort situation information accurately cannot be provided, cause line fault line walking difficulty, be unfavorable for quick elimination of faultWith the fast quick-recovery of line powering.

Summary of the invention

The object of the invention is to overcome the deficiency that prior art exists, a kind of protection forward outlet single back line single-phase earthing is providedWhen fault, fault-free range finding dead band, without voltage before line fault is remembered, keeps back without voltage before line fault is setRoad, utilizes before and after trouble point voltage ratio phase phase angle that step evolution can occur and changes this characteristic and realize double-circuit line singlephase earth fault essenceDetermine the method for position.

The technical solution adopted for the present invention to solve the technical problems is: based on directly adopting straight jumping communication mode double-circuit line single-phase earthingFault Locating Method, comprises following sequential steps:

(1) the I loop line road fault phase voltage of protection installation place, protector measuring double-circuit line on same pole roadI loop line road fault phaseElectric currentWith I loop line road zero-sequence currentMeasure other two normal phases voltages of I loop line roadWith II loop line road zero-sequence currentWherein, φ α β is ACB phase or BAC phase or CBA phase;

(2) φ phase voltage when protective device calculating I loop line road is normally movedWherein, φ α β is ACBPhase or BAC phase or CBA phase;

(3) to choose fault distance initial value be l to protective devicex, calculate on I loop line road, double-circuit line on same pole road apart from double-circuit line on same pole roadProtection installation place fault distance is lxThe φ phase voltage of pointWherein, zI1、zI0Be respectively unit length I loop line road positive sequence impedance, zero sequence impedance; zm0For unit length I loop line road and unit length II loop line road itBetween zero-sequence mutual inductance impedance;

(4) fault distance initial value lxWith fixed step size Δ, l increases progressively, and returns to step (3) and calculates successively double-circuit line on same pole road IThe φ phase voltage of every bit on loop line roadWhen leading I loop line road is normally movedφ phase voltage - j U · Iα - U · Iβ 3 Phase angle θ ( l x ) = Arg ( U · Iφ - l x z I 1 ( I · Iφ + z I 0 - z I 1 z I 1 I · I 0 + z m 0 3 z I 1 I · II 0 ) - j U · Iα - U · Iβ 3 ) , Until same barDouble-circuit line I returns total track length;

(5) choose l on I loop line road, double-circuit line on same pole roadxθ (the l that point is correspondingx) drop in (90 °, 270 °) and its adjacent underA lxθ (the l that+Δ l point is correspondingx+ Δ l) drops in (90 °, 90 °), and this centre position of 2 is trouble point.

The invention has the beneficial effects as follows:

Fault phase when the inventive method is utilized same loop line road two normal phase voltages after fault to calculate in real time double-circuit line normally to moveVoltage, without voltage before line fault is remembered, keeps loop without voltage before line fault is set. The inventive method profitWith voltage ratio phase phase angle before and after trouble point, step evolution can occur changes this characteristic and realizes the accurately fixed of double-circuit line singlephase earth faultPosition, has eliminated the impact on fault localization precision of transition resistance and load current in principle, at protection forward outlet single back line listFault-free range finding dead band when phase earth fault. The inventive method utilization is directly adopted straight jumping communication mode and is obtained another loop line road zero-sequence current,In algorithm model, take into account the impact of another loop line road zero-sequence current, in principle, eliminated zero-sequence mutual inductance between line to fault localization precisionImpact, has very high range accuracy.

Brief description of the drawings

Fig. 1 is application double-circuit line on same pole of the present invention road transmission system schematic diagram.

Detailed description of the invention

According to Figure of description, technical scheme of the present invention is expressed in further detail below.

Fig. 1 is application double-circuit line on same pole of the present invention road transmission system schematic diagram. In Fig. 1, CVT is that voltage transformer, CT are electricityCurrent transformer. In intelligent substation, sampled digital signal transmission channel is carried out to SV network communication networking, merge cells is adopted in real timeAfter the ac analog of collecting voltage transformer CVT summation current transformer CT output, merge cells is by the voltage transformer collectingThe ac analog of CVT summation current transformer CT output changes into sampled digital signal, is transferred to interchanger through optical-fibre communications, soAfter be directly transferred to protective relaying device through optical-fibre communications again.

One of the present invention, based on directly adopting straight jumping communication mode double-circuit line method for locating single-phase ground fault, comprises as follows sequentially stepRapid:

Protective relaying device is measured the I loop line road fault phase voltage of protection installation place, double-circuit line on same pole roadI loop line road fault phaseElectric currentWith I loop line road zero-sequence currentMeasure other two normal phases voltages of I loop line roadWith II loop line road zero sequenceElectric currentWherein, φ α β is ACB phase or BAC phase or CBA phase, that is, when φ=A phase time, α=C phase, β=B phase; As φ=BPhase time, α=A phase, β=C phase; When φ=C phase time, α=B phase, β=A phase; Above-mentioned I loop line road refers to event in double-circuit line on same pole roadOne loop line road of barrier, II loop line road refer in double-circuit line on same pole road normal operation another loop line road;

φ phase voltage when protective relaying device calculating I loop line road is normally movedWherein, φ α β is ACBPhase or BAC phase or CBA phase, that is, when φ=A phase time, α=C phase, β=B phase; When φ=B phase time, α=A phase, β=C phase;When φ=C phase time, α=B phase, β=A phase;

It is l that protective relaying device is chosen fault distance initial valuex, calculate on I loop line road, double-circuit line on same pole road apart from double-circuit line on same pole roadProtection installation place fault distance is lxThe φ phase voltage of pointWherein, zI1、zI0Be respectively unit length I loop line road positive sequence impedance, zero sequence impedance; zm0For unit length I loop line road and unit length II loop lineZero-sequence mutual inductance impedance between road;

Fault distance initial value lxWith fixed step size Δ, l increases progressively, and calculates successively the φ phase of every bit on I loop line road, double-circuit line on same pole roadVoltageφ phase voltage when leading I loop line road is normally movedPhase angle θ ( l x ) = Arg ( U · Iφ - l x z I 1 ( I · Iφ + z I 0 - z I 1 z I 1 I · I 0 + z m 0 3 z I 1 I · II 0 ) - j U · Iα - U · Iβ 3 ) , Until double-circuit line on same pole road I returns total track length;

Choose l on I loop line road, double-circuit line on same pole roadxθ (the l that point is correspondingx) drop in (90 °, 270 °) and its adjacent next onelxθ (the l that+Δ l point is correspondingx+ Δ l) drops in (90 °, 90 °), and this centre position of 2 is trouble point.

Fault phase when the inventive method is utilized same loop line road two normal phase voltages after fault to calculate in real time double-circuit line normally to moveVoltage, without voltage before line fault is remembered, keeps loop without voltage before line fault is set.

The inventive method is utilized before and after trouble point voltage ratio phase phase angle that step evolution can occur to change this characteristic to realize double-circuit line single-phaseThe accurate location of earth fault, has eliminated the impact on fault localization precision of transition resistance and load current in principle, in protection justFault-free range finding dead band during to outlet single back line singlephase earth fault.

The inventive method utilization is directly adopted straight jumping communication mode and is obtained another loop line road zero-sequence current, takes into account another loop line in algorithm modelThe impact of road zero-sequence current, has eliminated the impact of zero-sequence mutual inductance on fault localization precision between line in principle, have very high range finding essenceDegree.

The foregoing is only preferred embodiment of the present invention, but protection scope of the present invention is not limited to this, any familiarIn the technical scope that those skilled in the art disclose in the present invention, the variation that can expect easily or replacement, all should be encompassed inWithin protection scope of the present invention.

Claims (1)

1. based on directly adopting straight jumping communication mode double-circuit line method for locating single-phase ground fault, it is characterized in that, comprise as follows sequentiallyStep:
(1) the I loop line road fault phase voltage of protection installation place, protector measuring double-circuit line on same pole roadI loop line road fault phaseElectric currentWith I loop line road zero-sequence currentMeasure other two normal phases voltages of I loop line roadWith II loop line road zero-sequence currentWherein, φ α β is ACB phase or BAC phase or CBA phase;
(2) φ phase voltage when protective device calculating I loop line road is normally movedWherein, φ α β is ACBPhase or BAC phase or CBA phase;
(3) to choose fault distance initial value be l to protective devicex, calculate on I loop line road, double-circuit line on same pole road apart from double-circuit line on same pole roadProtection installation place fault distance is lxThe φ phase voltage of pointWherein, zI1、zI0Be respectively unit length I loop line road positive sequence impedance, zero sequence impedance; zm0For unit length I loop line road and unit length II loop line road itBetween zero-sequence mutual inductance impedance;
(4) fault distance initial value lxWith fixed step size Δ, l increases progressively, and returns to step (3), calculates successively double-circuit line on same pole road I and returnsThe φ phase voltage of every bit on circuitφ when leading I loop line road is normally movedPhase voltage - j U · Iα - U · Iβ 3 Phase angle θ ( l x ) = Arg ( U · Iφ - l x z I 1 ( I · Iφ + z I 0 - z I 1 z I 1 I · I 0 + z m 0 3 z I 1 I · II 0 ) - j U · Iα - U · Iβ 3 ) , Until two with barLoop line road I returns total track length;
(5) choose l on I loop line road, double-circuit line on same pole roadxθ (the l that point is correspondingx) drop in (90 °, 270 °) and its adjacent underA lxθ (the l that+Δ l point is correspondingx+ Δ l) drops in (90 °, 90 °), and this centre position of 2 is trouble point.
CN201410060245.3A 2014-02-21 2014-02-21 Based on directly adopting straight jumping communication mode double-circuit line method for locating single-phase ground fault CN103869220B (en)

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CN104035004B (en) * 2014-07-04 2016-08-24 国家电网公司 The non-same famous prime minister's cross-line earth fault method of single end distance measurement of double-circuit line of zero sequence compensation
CN104049181A (en) * 2014-07-04 2014-09-17 国家电网公司 Double-circuit line non-synonymous cross-line grounding fault discrimination method
CN104062551B (en) * 2014-07-04 2016-08-17 国家电网公司 A kind of non-same famous prime minister's cross-line earth fault method for rapidly positioning of double-circuit line
CN104035006B (en) * 2014-07-04 2017-02-01 国家电网公司 Double-circuit line non-in-phase cross-line earth fault judgment method based on trigonometric function
CN104062550B (en) * 2014-07-04 2017-02-15 国家电网公司 Method for locating non-homonymic phase overline earth fault of double-circuit line based on binary search
CN104062539B (en) * 2014-07-04 2017-02-15 国家电网公司 Single-ended distance measuring method for double-circuit line non-same-name phase crossover line ground fault
CN104090210B (en) * 2014-07-15 2016-08-17 国家电网公司 The non-same famous prime minister's cross-line earth fault method of single end distance measurement of double-circuit line
CN104090200B (en) * 2014-07-15 2016-08-24 国家电网公司 Double-circuit line non-same famous prime minister's cross-line earth fault single-ended amplitude distance-finding method
CN104090213A (en) * 2014-07-25 2014-10-08 国家电网公司 Double-circuit-line non-same-name phase overline ground fault positioning method
CN105203919A (en) * 2015-09-14 2015-12-30 国网福建省电力有限公司 Circuit single-phase earth fault single-end locating method based on impedance locating function phase characteristics

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