CN103779847A - Same-pole double-circuit line one-phase ground voltage ratio phase protection method based on SV network sampling - Google Patents

Same-pole double-circuit line one-phase ground voltage ratio phase protection method based on SV network sampling Download PDF

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CN103779847A
CN103779847A CN201410053655.5A CN201410053655A CN103779847A CN 103779847 A CN103779847 A CN 103779847A CN 201410053655 A CN201410053655 A CN 201410053655A CN 103779847 A CN103779847 A CN 103779847A
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phase
line
fault
loop line
protection
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CN103779847B (en
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林富洪
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State Grid Corp of China SGCC
State Grid Fujian Electric Power Co Ltd
Putian Power Supply Co of State Grid Fujian Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Fujian Electric Power Co Ltd
Putian Power Supply Co of State Grid Fujian Electric Power Co Ltd
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Abstract

The invention discloses a same-pole double-circuit line one-phase ground voltage ratio phase protection method based on SV network sampling. The method includes the steps that the fault-phase voltage of a first line, the fault-phase current of the first line, the zero-sequence current of the first line, the voltages of the other two normal phases of the first line and the zero-sequence current of a second line of a same-pole double-circuit line protection installing position are measured; the fault-phase voltage of the first circuit working normally is calculated through the voltages of the other two normal phases of the first line, the fault-phase voltage of a protection setting range of the first line is calculated, whether the phase angle of the fault-phase voltage of the protection setting range of the first line superior to the fault-phase voltage during normal work of the first line is larger than -90 degrees and smaller than 90 degrees or not is judged, and if yes, whether a one-phase ground fault of the protection setting range of the first line is generated or not is judged, and breakers at the two ends of the first line are switched off by a protection device. By means of the same-pole double-circuit line one-phase ground voltage ratio phase protection method based on SV network sampling, the influence of line-line zero-sequence mutual inductive impedance on protection motion performance is eliminated, false operation is avoided, and a good transition resistance and load current influence resistance effect is achieved.

Description

Based on SV network sampling double-circuit line on same pole road single-phase earthing voltage ratio phase guard method
Technical field
The present invention relates to Relay Protection Technology in Power System field, specifically relate to a kind of based on SV network sampling double-circuit line on same pole road single-phase earthing voltage ratio phase guard method.
Background technology
Impedance distance protection is positioned at protection zone apart from length with differentiation fault point according to measurement impedance magnitude faults and is still positioned at outside protection zone.Impedance distance protection is little owing to affected by power system operation mode and structural change, is total failure component for the electric parameters of computation and measurement impedance, is applicable to the line protection of the whole failure process of circuit.
Tradition transmission line single-phase earthing distance protection hypothesis single phase ground fault is metallic short circuit fault; ratio calculation by fault phase voltage and fault phase electric current is measured impedance, and the distance of carrying out faults point according to measurement impedance magnitude is to determine whether to send action trip signal.In fact, in electric power system, except the metallic earthing short trouble of arteface, the transition resistance of actual transmission line one-phase earth fault point is also non-vanishing, and the additional impedance that transition resistance produces can have a strong impact on the performance of impedance distance protection.If the additional impedance that transition resistance produces is resistance sense, impedance distance protection tripping while easily causing in protection zone single phase ground fault; If the additional impedance that transition resistance produces is capacitance-resistance, impedance distance protection generation steady-state while easily causing single phase ground fault the protection zone outside.
Operating characteristics round edge circle of existing transmission line single-phase earthing distance protection is through the origin of coordinates; because the origin of coordinates is positioned on operating characteristics round edge circle; when protection forward outlet single-phase grounding fault there is dead band in protection; and along with transition resistance and load current increase, protection forward outlet dead band is larger.Because the origin of coordinates is positioned on operating characteristics round edge circle, protection in the other direction exports single-phase grounding fault and exists possibility of malfunction, and transition resistance is larger, protects easier misoperation when protection exports single-phase grounding fault in the other direction.
Owing to there being very strong zero-sequence mutual inductance between analyses for double circuits on same tower line, based on traditional transformer station of cable secondary circuit, single-phase earthing distance protection cannot be obtained the zero-sequence current on another loop line road, in algorithm model, cannot eliminate the impact of zero-sequence mutual inductance between line, be subject to the impact of zero-sequence mutual inductance between line, when traditional single phase ground distance protection is applied to analyses for double circuits on same tower, its protection range will expand greatly, at protection setting range place usually there is steady-state in fault, while making to protect external area error, easily there is misoperation, easily cause the large transfer of trend, causing large area blackout occurs.
Summary of the invention
The object of the invention is to overcome the deficiency that prior art exists; unprotect dead band when a kind of protection forward outlet single back line single phase ground fault is provided; not misoperation when protection exports single back line single phase ground fault in the other direction; without voltage before line fault is remembered; keep loop without voltage before line fault is set, operating characteristics the whole failure process of double-circuit line generation single back line single phase ground fault be all transient state operating characteristics based on the double-circuit line on same pole road single-phase earthing voltage ratio phase guard method of sampling of SV network.
The technical solution adopted for the present invention to solve the technical problems is: based on SV network sampling double-circuit line on same pole road single-phase earthing voltage ratio phase guard method, comprise following sequential steps:
(1) the I loop line road fault phase voltage of protection installation place, protector measuring double-circuit line on same pole road
Figure BDA0000466709540000025
, I loop line road fault phase electric current
Figure BDA0000466709540000026
with I loop line road zero-sequence current
Figure BDA0000466709540000027
, measure other two normal phases voltages of I loop line road
Figure BDA0000466709540000028
; Measure the II loop line road zero-sequence current of protection installation place, double-circuit line on same pole road
Figure BDA0000466709540000029
; Wherein, φ α β=ACB, BAC, CBA phase;
(2) φ phase voltage when protective device calculating I loop line road is normally moved
Figure BDA00004667095400000210
wherein, φ α β=ACB, BAC, CBA phase;
(3) protective device calculates the φ phase voltage that I goes back to route protection setting range place
Figure BDA0000466709540000021
wherein, x setfor I returns route protection setting range; z i1, z i0be respectively unit length I loop line road positive sequence impedance, zero sequence impedance; z m0for the zero-sequence mutual inductance impedance between unit length I loop line road and unit length II loop line road;
(4) protective device judges that I returns the φ phase voltage at route protection setting range place
Figure BDA0000466709540000022
φ phase voltage when leading I loop line road is normally moved
Figure BDA0000466709540000023
phase angle
Figure BDA0000466709540000024
drop in (90 °, 90 °) scope and whether set up, if set up, judge that I returns generation φ phase earth fault in route protection setting range, the circuit breaker at two ends, protective device tripping I loop line road.
The invention has the beneficial effects as follows:
First the inventive method measures I loop line road fault phase voltage, I loop line road fault phase electric current and the I loop line road zero-sequence current of protection installation place, double-circuit line on same pole road, measure other two normal phases voltages of I loop line road, measure the II loop line road zero-sequence current of protection installation place, double-circuit line on same pole road; Fault phase voltage while utilizing two normal phase voltage calculation I loop line roads, I loop line road normally to move; calculate the fault phase voltage that I goes back to route protection setting range place; then the phase angle that judges fault phase voltage when the leading I loop line of fault phase voltage road that I goes back to route protection setting range place is normally moved drops on (90 °; 90 °) whether set up in scope; if set up; judge that I returns generation single phase ground fault in route protection setting range, the circuit breaker at two ends, protective device tripping I loop line road.The inventive method is sampled and is obtained another loop line road zero-sequence current based on SV network, takes into account the impact of another loop line road zero-sequence current in algorithm model, has eliminated the impact of zero-sequence mutual inductance impedance on Perfomance of protective relaying between line in principle.The inventive method operating characteristics circle is through third quadrant; the origin of coordinates is positioned at operating characteristics circle; therefore the inventive method unprotect dead band in the time of protection outlet single back line single phase ground fault, not misoperation when protection exports single back line single phase ground fault in the other direction.The inventive method is without voltage before line fault is remembered, and relaying protection hardware keeps loop without voltage before line fault is set.The inventive method operating characteristics is all transient state operating characteristics in the whole failure process of double-circuit line generation single back line single phase ground fault, has the ability of very strong anti-transition resistance and load current impact.
Accompanying drawing explanation
Fig. 1 is application double-circuit line on same pole of the present invention road transmission system schematic diagram.
Embodiment
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 current transformer.In intelligent substation; sampled digital signal transmission channel is carried out to SV network communication networking; after the ac analog of merge cells Real-time Collection voltage transformer CVT summation current transformer CT output; the ac analog of the voltage transformer CVT summation current transformer CT output collecting is changed into sampled digital signal by merge cells; be transferred to interchanger through optical-fibre communications, and then be transferred to the relay protection of transmission line device of application the inventive method through optical-fibre communications.
Protective relaying device is measured the I loop line road fault phase voltage of protection installation place, double-circuit line on same pole road
Figure BDA0000466709540000031
i loop line road fault phase electric current
Figure BDA0000466709540000032
with I loop line road zero-sequence current
Figure BDA0000466709540000033
measure other two normal phases voltages of I loop line road
Figure BDA0000466709540000034
during based on SV network implementation, measure the II loop line road zero-sequence current of protection installation place, double-circuit line on same pole road
Figure BDA0000466709540000047
; Wherein, φ α β=ACB, BAC, 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.Above-mentioned I loop line road refers to a loop line road of fault in double-circuit line on same pole road, II loop line road refer in double-circuit line on same pole road normal operation another loop line road.
Fault phase voltage when protective relaying device utilizes two normal phase voltage calculation I loop line roads, I loop line road normally to move, utilizes I loop line road two normal phase voltages
Figure BDA0000466709540000041
φ phase voltage when calculating I loop line road is normally moved wherein, φ α β=ACB, BAC, 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.
Protective relaying device calculates the φ phase voltage that I goes back to route protection setting range place
Figure BDA0000466709540000043
wherein, x setfor I returns route protection setting range; z i1, z i0be respectively unit length I loop line road positive sequence impedance, zero sequence impedance; z m0for the zero-sequence mutual inductance impedance between unit length I loop line road and unit length II loop line road.
Protective relaying device judges that I returns the φ phase voltage at route protection setting range place
Figure BDA0000466709540000044
φ phase voltage when leading I loop line road is normally moved phase angle
drop in the scope of operating characteristics region (90 °, 90 °) and whether set up, if set up, judge that I returns generation φ phase earth fault in route protection setting range, the circuit breaker at two ends, protective relaying device tripping I loop line road.
The inventive method is sampled and is obtained another loop line road zero-sequence current based on SV network, takes into account the impact of another loop line road zero-sequence current in algorithm model, has eliminated the impact of zero-sequence mutual inductance impedance on Perfomance of protective relaying between line in principle.
The inventive method operating characteristics circle is through third quadrant; the origin of coordinates is positioned at operating characteristics circle; therefore the inventive method unprotect dead band in the time of protection outlet single back line single phase ground fault, not misoperation when protection exports single back line single phase ground fault in the other direction.
The inventive method is without voltage before line fault is remembered, and relaying protection hardware keeps loop without voltage before line fault is set.
The inventive method operating characteristics is all transient state operating characteristics in the whole failure process of double-circuit line generation single back line single phase ground fault, has the ability of very strong anti-transition resistance and load current impact.
The foregoing is only preferred embodiment of the present invention; but protection scope of the present invention is not limited to this; any be familiar with those skilled in the art the present invention disclose technical scope in, the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.

Claims (1)

1. based on SV network sampling double-circuit line on same pole road single-phase earthing voltage ratio phase guard method, it is characterized in that, comprise following sequential steps:
(1) the I loop line road fault phase voltage of protection installation place, protector measuring double-circuit line on same pole road
Figure FDA0000466709530000011
i loop line road fault phase electric current with I loop line road zero-sequence current
Figure FDA0000466709530000012
measure other two normal phases voltages of I loop line road
Figure FDA0000466709530000013
measure the II loop line road zero-sequence current of protection installation place, double-circuit line on same pole road ; Wherein, φ α β=ACB, BAC, CBA phase;
(2) φ phase voltage when protective device calculating I loop line road is normally moved
Figure FDA0000466709530000014
wherein, φ α β=ACB, BAC, CBA phase;
(3) protective device calculates the φ phase voltage that I goes back to route protection setting range place
Figure FDA0000466709530000015
wherein, x setfor I returns route protection setting range; z i1, z i0be respectively unit length I loop line road positive sequence impedance, zero sequence impedance; z m0for the zero-sequence mutual inductance impedance between unit length I loop line road and unit length II loop line road;
(4) protective device judges that I returns the φ phase voltage at route protection setting range place
Figure FDA0000466709530000016
φ phase voltage when leading I loop line road is normally moved
Figure FDA0000466709530000017
phase angle
Figure FDA0000466709530000018
drop in the scope of operating characteristics region (90 °, 90 °) and whether set up, if set up, judge that I returns generation φ phase earth fault in route protection setting range, the circuit breaker at two ends, protective device tripping I loop line road.
CN201410053655.5A 2014-02-18 2014-02-18 Based on the guard method of SV network samples common-tower double-circuit lines single-phase earthing voltage ratio phase Active CN103779847B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104052035A (en) * 2014-07-09 2014-09-17 国家电网公司 Same-tower double-circuit line single-phase grounded reactance relay
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
CN104953566A (en) * 2015-06-17 2015-09-30 国家电网公司 Voltage protection method for non-homonymic phase overline grounding fault of double-circuit line with full transient action characteristic

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CN101593964A (en) * 2009-06-30 2009-12-02 许继电气股份有限公司 The method for longitudinal zero-sequence power direction protection of double-circuit lines on the same pole
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104052035A (en) * 2014-07-09 2014-09-17 国家电网公司 Same-tower double-circuit line single-phase grounded reactance relay
CN104052035B (en) * 2014-07-09 2017-02-15 国家电网公司 Same-tower double-circuit line single-phase grounded reactance relay
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
CN104953566A (en) * 2015-06-17 2015-09-30 国家电网公司 Voltage protection method for non-homonymic phase overline grounding fault of double-circuit line with full transient action characteristic

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Address after: 100031 West Chang'an Avenue, Xicheng District, Xicheng District, Beijing

Co-patentee after: STATE GRID FUJIAN ELECTRIC POWER Co.,Ltd.

Patentee after: STATE GRID CORPORATION OF CHINA

Co-patentee after: STATE GRID PUTIAN ELECTRIC POWER SUPPLY Co.

Address before: 100031 West Chang'an Avenue, Xicheng District, Xicheng District, Beijing

Co-patentee before: STATE GRID FUJIAN ELECTRIC POWER Co.,Ltd.

Patentee before: State Grid Corporation of China

Co-patentee before: STATE GRID PUTIAN ELECTRIC POWER SUPPLY Co.

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Effective date of registration: 20181204

Address after: 351100 No. 999, South Garden Road, Xia Lin Street, Chengxiang District, Putian, Fujian

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Patentee after: STATE GRID PUTIAN ELECTRIC POWER SUPPLY Co.

Co-patentee after: STATE GRID CORPORATION OF CHINA

Address before: 100031 West Chang'an Avenue, Xicheng District, Xicheng District, Beijing

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