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 PDFInfo
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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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Abstract
本发明公开了一种基于SV网络采样同杆双回线路单相接地电压比相保护方法，测量同杆双回线路保护安装处的I回线路故障相电压、I回线路故障相电流、I回线路零序电流、I回线路其他两正常相电压、II回线路零序电流；利用I回线路两正常相电压计算I回线路正常运行时的故障相电压，计算I回线路保护整定范围处的故障相电压，判断I回线路保护整定范围处的故障相电压领先I回线路正常运行时的故障相电压的相角落在（-90°，90°）范围内是否成立，若成立，则判断I回线路保护整定范围内发生单相接地故障，保护装置跳开I回线路两端的断路器。本发明消除了线间零序互感阻抗对保护动作性能的影响，不误动作，有很强的抗过渡电阻和负荷电流影响的能力。
The invention discloses a phase-comparison protection method for single-phase grounding voltage of double-circuit lines on the same pole based on SV network sampling, and measures the fault phase voltage of the I-circuit line, the fault phase current of the I-circuit line, and the Line zero-sequence current, other two normal phase voltages of I circuit line, and II circuit line zero-sequence current; use the two normal phase voltages of I circuit line to calculate the fault phase voltage of I circuit line during normal operation, and calculate the protection setting range of I circuit line Fault phase voltage, judge whether the phase angle of the fault phase voltage at the protection setting range of the I circuit line is ahead of the fault phase voltage of the I circuit line during normal operation within the range of (-90°, 90°), if it is established, then judge the I When a single-phase ground fault occurs within the setting range of the circuit protection, the protection device trips the circuit breakers at both ends of the circuit I. The invention eliminates the influence of the inter-line zero-sequence mutual inductance impedance on the protection action performance, does not operate in error, and has a strong ability to resist the influence of transition resistance and load current.
Description
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
, I loop line road fault phase electric current
with I loop line road zero-sequence current
, 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
; Wherein, φ α β=ACB, BAC, CBA phase;
(2) φ phase voltage when protective device calculating I loop line road is normally moved
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
(4) protective device judges that I returns the φ phase voltage at route protection setting range place
φ phase voltage when leading I loop line road is normally moved
phase angle
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
i loop line road fault phase electric current
with I loop line road zero-sequence current
measure other two normal phases voltages of I loop line road
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
; 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
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
Protective relaying device judges that I returns the φ phase voltage at route protection setting range place
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
i loop line road fault phase electric current
with I loop line road zero-sequence current
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
; Wherein, φ α β=ACB, BAC, CBA phase;
(2) φ phase voltage when protective device calculating I loop line road is normally moved
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
(4) protective device judges that I returns the φ phase voltage at route protection setting range place
φ phase voltage when leading I loop line road is normally moved
phase angle
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410053655.5A CN103779847B (en) | 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 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410053655.5A CN103779847B (en) | 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 |
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| CN103779847A true CN103779847A (en) | 2014-05-07 |
| CN103779847B CN103779847B (en) | 2016-04-06 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104052035A (en) * | 2014-07-09 | 2014-09-17 | 国家电网公司 | Single-phase grounding reactance relay for double-circuit lines paralleled on the same pole |
| 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 | Longitudinal zero-sequence power directional protection method for double-circuit lines paralleled on the same pole |
| CN101813736A (en) * | 2009-04-15 | 2010-08-25 | 河南省电力公司 | Distance protection measurement method of double-circuit line on the same pole |
| CN102023275A (en) * | 2010-09-27 | 2011-04-20 | 华北电力大学 | Single-end ranging method of line based on phase mutation characteristics of positioning function |
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2014
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| CN101813736A (en) * | 2009-04-15 | 2010-08-25 | 河南省电力公司 | Distance protection measurement method of double-circuit line on the same pole |
| CN101593964A (en) * | 2009-06-30 | 2009-12-02 | 许继电气股份有限公司 | Longitudinal zero-sequence power directional protection method for double-circuit lines paralleled on the same pole |
| CN102023275A (en) * | 2010-09-27 | 2011-04-20 | 华北电力大学 | Single-end ranging method of line based on phase mutation characteristics of positioning function |
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| 所南加乐: "利用单端电流的同杆双回线准确故障定位研究", 《中国电机工程学报》 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104052035A (en) * | 2014-07-09 | 2014-09-17 | 国家电网公司 | Single-phase grounding reactance relay for double-circuit lines paralleled on the same pole |
| 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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| CN103779847B (en) | 2016-04-06 |
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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 Co-patentee after: STATE GRID FUJIAN ELECTRIC POWER Co.,Ltd. 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 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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