CN103545799A - Circuit differential protection method automatically adapting to external bridge circuit - Google Patents
Circuit differential protection method automatically adapting to external bridge circuit Download PDFInfo
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- CN103545799A CN103545799A CN201310534664.1A CN201310534664A CN103545799A CN 103545799 A CN103545799 A CN 103545799A CN 201310534664 A CN201310534664 A CN 201310534664A CN 103545799 A CN103545799 A CN 103545799A
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Abstract
The invention discloses a circuit differential protection method automatically adapting to an external bridge circuit. The three operating states of the circuit are determined according to the position of an external bridge circuit disconnecting link and a bridge breaker disconnecting link, wherein the three operating states include a branching power supply state, a paralleling operation state and a circuit repairing state. The corresponding current is selected according to the operating states of the circuit to serve as the magnitude of the current for the circuit current differential protection. When the differential protection acts, the corresponding breaker is tripped off according to the operating state of the circuit to remove the fault. The operating states of the circuit can be automatically recognized, the problem that a 110-kilovolt external bridge circuit transformer substation cannot apply the circuit differential protection is solved, and the safety and reliability of an electric power system electric transmission line are improved.
Description
Technical field
The invention belongs to relay protection of power system and automatic field, be specifically related to a kind of line differential protection method.
Background technology
The correct operation of relay protection of transmission line equipment has vital effect to improving stability of power system and power supply reliability.Current differential protection is the main guard method of power system transmission line; fibre-optic current differential protection is the main implementation of Line Current Differential Protection; fibre-optic current differential protection is on the basis of current differential protection, to develop and come; basic protection philosophy is based on Kirchhoff's current law (KCL), and fibre-optic current differential protection is the relay protecting method extensively adopting at China's power system transmission line at present.
For Line Current Differential Protection, must obtain the application of the current information guarantee Kirchhoff's theorem of each side of protected circuit.For 110kV transformer station, also generally adopt Line Current Differential Protection; but there is no circuit breaker summation current transformer for the transformer station of outer bridging line because of line side; cannot directly implement current differential protection; make the outer bridge circuit of 110kV can not application circuit differential protection, bring hidden danger to the safe operation of power system transmission line.
Summary of the invention
The invention provides a kind of Line Current Differential Protection method that can automatically adapt to outer bridging line state, to overcome the deficiency of existing fibre-optic current differential protection.
The present invention specifically by the following technical solutions.
A line differential protection method for the outer bridging line of automatic adaptation, is characterized in that, described guard method comprises the following steps:
(1) gather electric current, this side transformer high voltage side current and the bridge circuit breaker current of circuit offside;
(2) gather the positional information of this side tool lock of this side line road disconnecting link and bridge circuit breaker;
(3) according to the positional information of this side tool lock of bridge circuit breaker and this side line road disconnecting link, determine the running status of circuit;
(4) according to the residing running status of circuit, select the corresponding magnitude of current to participate in the calculating of line differential protection, and the circuit breaker that will trip while selecting corresponding circuit breaker to move as differential protection.
4.1 when this side line road disconnecting link closure, and this side tool lock of bridge circuit breaker is when disconnect, judge that this circuit is in fanout operation state; get this side transformer high voltage side current and offside line current carries out differential protection calculating; if differential protection action, the circuit breaker of this side transformer of tripping high-pressure side circuit breaker and circuit offside transformer station;
4.2 when this side line road disconnecting link closure, when simultaneously this side tool lock of bridge circuit breaker is also closed, judge that this circuit is in paired running state, get the phasor of bridge circuit breaker current and this side transformer high voltage side current and as this side electric current, with circuit offside electric current, carry out differential protection calculating, if differential protection action, the circuit breaker of tripping bridge circuit breaker, this side transformer high-pressure side circuit breaker and circuit offside transformer station;
4.3 when this side line road disconnecting link disconnects, and judges that this circuit is when inspection travel state, and this side electric current is got to 0 and carry out differential protection calculating with the electric current of circuit offside, if differential protection action, tripping offside line switching.
The present invention is automatically the residing state of identification circuit, solved the problem that the outer bridging line of 110kV transformer station cannot application circuit differential protection, improved the safety and reliability of power system transmission line.
Accompanying drawing explanation
Fig. 1 is the current differential protection schematic diagram of the outer bridging line operational mode of 110kV;
Fig. 2 is that the application adapts to the schematic flow sheet of the line differential protection method of outer bridging line automatically.
Embodiment
Below in conjunction with accompanying drawing and example, the present invention is described in further detail.
Be illustrated in figure 1 the current differential protection schematic diagram of the outer bridging line operational mode of 110kV.There are two transformers in Ben Ce transformer station, and this side transformer high-pressure side circuit breaker is respectively QF1 and QF2, and high-pressure side circuit breaker connects with bridge circuit breaker Q F3 near line side.This side transformer high-pressure side circuit breaker Q F1 is to there being this side line road disconnecting link QS1 between circuit, this side transformer high-pressure side circuit breaker Q F2 is to there being this side line road disconnecting link QS2 between circuit, bridge circuit breaker Q F3 both sides disconnecting link is respectively QS3 and QS4, wherein claims that QS3 is this side tool lock of bridge circuit breaker.The circuit breaker of connection line offside transformer station of circuit breaker Q F1 institute is QF5.
Be illustrated in figure 2 the schematic flow sheet of the line differential protection method of the outer bridging line of the disclosed automatic adaptation of the application, the line differential protection method of the outer bridging line of described automatic adaptation specifically comprises the following steps:
Step 1: the electric current, this side transformer high voltage side current and the bridge circuit breaker current that gather circuit offside;
The offside electric current of Current Transformer measurement circuitry, i.e. the electric current of offside circuit breaker Q F5, and this side transformer high voltage side current is circuit breaker Q F1 electric current, and bridge circuit breaker Q F3 electric current;
Step 2: the positional information that gathers this side tool lock of this side line road disconnecting link and bridge circuit breaker;
The disconnecting link positional information that gathers this side line road disconnecting link QS1 and this side tool of bridge circuit breaker lock QS3, for convenience of description, closing position is 1, open position is 0.
Step 3: the running status of determining circuit according to the positional information of this side tool lock of bridge circuit breaker and this side line road disconnecting link;
According to the running status of this circuit of location positioning of this side tool lock QS3 of bridge circuit breaker and this side line road disconnecting link QS1, circuit has three kinds of states: apportion power supply state, paired running state, line maintenance state.
Step 4: according to the residing running status of circuit, select the corresponding magnitude of current to participate in the calculating of line differential protection, and the circuit breaker that will trip while selecting corresponding circuit breaker to move as differential protection:
When QS1 is 1 and QS3 while being 0, be considered as fanout operation state, get this side transformer high voltage side current and offside line current carries out differential protection calculating, if differential protection action, tripping circuit breaker Q F1 and offside circuit breaker Q F5;
When QS1 is 1 and QS3 while being 1, while being considered as paired running state; get this side transformer high voltage side current and bridge circuit breaker Q F3 electric current phasor and carry out differential protection calculating with circuit offside electric current QF5, if differential protection action, tripping circuit breaker Q F1, QF3 and offside circuit breaker Q F5;
When QS1 is 0, be considered as inspection travel state, this side electric current is got to 0 and carry out differential protection calculating with circuit offside electric current, if differential protection action, tripping offside circuit breaker Q F5.
The embodiment more than providing is in order to illustrate the present invention and its practical application, not the present invention is done to any pro forma restriction, any one professional and technical personnel, within not departing from the scope of technical solution of the present invention, does certain modification and changes as the equivalent embodiment that is considered as equivalent variations according to above technology and method.
Claims (2)
1. automatically adapt to a line differential protection method for outer bridging line, it is characterized in that, described guard method comprises the following steps:
(1) gather electric current, this side transformer high voltage side current and the bridge circuit breaker current of circuit offside;
(2) gather the positional information of this side tool lock of this side line road disconnecting link and bridge circuit breaker;
(3) according to the positional information of this side tool lock of bridge circuit breaker and this side line road disconnecting link, determine the running status of circuit;
(4) according to the residing running status of circuit, select the corresponding magnitude of current to participate in the calculating of line differential protection, and the circuit breaker that will trip while selecting corresponding circuit breaker to move as differential protection.
2. the line differential protection method of the outer bridging line of automatic adaptation according to claim 1, is characterized in that:
In step (4), according to the following running status of circuit, select the corresponding magnitude of current to participate in the calculating of line differential protection, and the circuit breaker that will trip while selecting corresponding circuit breaker to move as differential protection:
4.1 when this side line road disconnecting link closure, and this side tool lock of bridge circuit breaker is when disconnect, judge that this circuit is in fanout operation state; get this side transformer high voltage side current and offside line current carries out differential protection calculating; if differential protection action, the circuit breaker of this side transformer of tripping high-pressure side circuit breaker and circuit offside transformer station;
4.2 when this side line road disconnecting link closure; when simultaneously this side tool lock of bridge circuit breaker is also closed; judge that this circuit is in paired running state; get the phasor of bridge circuit breaker current and this side transformer high voltage side current and as this side electric current; with circuit offside electric current, carry out differential protection calculating; if differential protection action, the circuit breaker of tripping bridge circuit breaker, this side transformer high-pressure side circuit breaker and circuit offside transformer station.
4.3 when this side line road disconnecting link disconnects, and judges that this circuit is when inspection travel state, and this side electric current is got to 0 and carry out differential protection calculating with the electric current of circuit offside, if differential protection action, tripping offside line switching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310534664.1A CN103545799A (en) | 2013-11-01 | 2013-11-01 | Circuit differential protection method automatically adapting to external bridge circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310534664.1A CN103545799A (en) | 2013-11-01 | 2013-11-01 | Circuit differential protection method automatically adapting to external bridge circuit |
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| CN103545799A true CN103545799A (en) | 2014-01-29 |
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| CN201310534664.1A Pending CN103545799A (en) | 2013-11-01 | 2013-11-01 | Circuit differential protection method automatically adapting to external bridge circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105576812A (en) * | 2016-02-29 | 2016-05-11 | 国网江苏省电力公司电力科学研究院 | Zero sequence current locking protection method for contact failure of UPFC parallel transformer transfer switch |
| CN107591784A (en) * | 2017-08-23 | 2018-01-16 | 中国南方电网有限责任公司 | A kind of distribution statements based on collusion adaptive incomplete differential protection method of circuit |
| CN108229701A (en) * | 2018-01-04 | 2018-06-29 | 国网浙江省电力有限公司电力科学研究院 | Intelligent substation measure and control device sampled value overhauls application process and system |
| CN113765219A (en) * | 2021-08-18 | 2021-12-07 | 中国南方电网有限责任公司超高压输电公司大理局 | Power system knife switch control method and device, computer equipment and storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1812226A (en) * | 2005-01-25 | 2006-08-02 | 辽宁省电力有限公司辽阳供电公司 | Adaptive master variable, parent connection and connecting line stand-by dispensing device and realizing method |
| CN1964149A (en) * | 2006-12-19 | 2007-05-16 | 北京四方继保自动化股份有限公司 | A differential protection method for negative sequence current of large power transformer |
| CN101478177A (en) * | 2009-01-08 | 2009-07-08 | 杭州市电力局 | Safe automatic control method suitable for transforming plant main transformer tripping |
| CN201789272U (en) * | 2010-04-30 | 2011-04-06 | 金华电业局 | Relay protection circuit preventing transformer differential protection malfunction |
-
2013
- 2013-11-01 CN CN201310534664.1A patent/CN103545799A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1812226A (en) * | 2005-01-25 | 2006-08-02 | 辽宁省电力有限公司辽阳供电公司 | Adaptive master variable, parent connection and connecting line stand-by dispensing device and realizing method |
| CN1964149A (en) * | 2006-12-19 | 2007-05-16 | 北京四方继保自动化股份有限公司 | A differential protection method for negative sequence current of large power transformer |
| CN101478177A (en) * | 2009-01-08 | 2009-07-08 | 杭州市电力局 | Safe automatic control method suitable for transforming plant main transformer tripping |
| CN201789272U (en) * | 2010-04-30 | 2011-04-06 | 金华电业局 | Relay protection circuit preventing transformer differential protection malfunction |
Non-Patent Citations (2)
| Title |
|---|
| 张瑞芳等: "110kV内桥接线主变差动保护整定计算的探讨", 《变压器》 * |
| 金建国: "浅析内桥接线变电站主变差动保护误动和死区问题", 《电子世界》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105576812A (en) * | 2016-02-29 | 2016-05-11 | 国网江苏省电力公司电力科学研究院 | Zero sequence current locking protection method for contact failure of UPFC parallel transformer transfer switch |
| CN105576812B (en) * | 2016-02-29 | 2017-11-03 | 国网江苏省电力公司电力科学研究院 | The zero-sequence current latch-up protection method of UPFC shunt transformer change-over switch loose contacts |
| CN107591784A (en) * | 2017-08-23 | 2018-01-16 | 中国南方电网有限责任公司 | A kind of distribution statements based on collusion adaptive incomplete differential protection method of circuit |
| CN107591784B (en) * | 2017-08-23 | 2019-03-26 | 中国南方电网有限责任公司 | A kind of distribution statements based on collusion adaptive incomplete differential protection method of route |
| CN108229701A (en) * | 2018-01-04 | 2018-06-29 | 国网浙江省电力有限公司电力科学研究院 | Intelligent substation measure and control device sampled value overhauls application process and system |
| CN113765219A (en) * | 2021-08-18 | 2021-12-07 | 中国南方电网有限责任公司超高压输电公司大理局 | Power system knife switch control method and device, computer equipment and storage medium |
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Application publication date: 20140129 |