CN103066576B - Circuit differential motion protection method utilizing harmonic summarized information to prevent saturated maloperation - Google Patents
Circuit differential motion protection method utilizing harmonic summarized information to prevent saturated maloperation Download PDFInfo
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- CN103066576B CN103066576B CN201210574938.5A CN201210574938A CN103066576B CN 103066576 B CN103066576 B CN 103066576B CN 201210574938 A CN201210574938 A CN 201210574938A CN 103066576 B CN103066576 B CN 103066576B
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Abstract
The invention discloses a circuit differential motion protection method utilizing harmonic summarized information to prevent saturated maloperation. Circuit current is collected by the method, fundamental component of the circuit current is utilized for circuit differential motion protection calculation. When a differential protection action condition is met, protection is not conducted, and if the different protection action condition is met, the harmonic summarized component Ix on the side is calculated further. If the equation that Ix >0.15 is satisfied, delay Tx of lock different protection is confirmed according to a value of the Ix, when the Tx is delayed or the equation that Ix <0.15 is satisfied and the different protection action condition is met, the different protection is conducted, and if not, the different protection is locked. The circuit differential motion protection method utilizing the harmonic summarized information to prevent the saturated maloperation has high reliability and safety, can rapidly remove faults in a circuit area when captive test (CT) is not saturated, can effectively prevent the maloperation possibly produced by the faults outside the circuit area when the CT is saturated, and improves safety and reliability of an electrical power system electric transmission line.
Description
Technical field
The invention belongs to relay protection of power system and technical field of automation, be specifically related to a kind of current harmonics information that utilizes and prevent line differential protection in the guard method of the saturated malfunction of CT.
Background technology
Fibre-optic current differential protection develops on the basis of current differential protection and comes; basic protection philosophy is based on basic current law; it can make protection realize blocking ideally; principle is simple; not by the impact of changes of operating modes; and there is no electrical communication due to the protective device of both sides, improve reliability of operation.Estimated current differential protection uses in a large number on the main transformer of electric power system, circuit and bus, and it is highly sensitive, action is simple and reliable fast, can adapt to the advantage such as power system oscillation, open-phase operation, be other protection forms incomparable.Fibre-optic current differential protection needs the problem considering that CT is saturated equally, during external area error, if the larger CT that may cause of the amplitude of passing through property electric current is saturated, occurs that difference stream causes differential protection malfunction, need take measures on customs clearance and avoid false protection.
Summary of the invention
For solving the problems referred to above that prior art exists, the invention provides a kind of current harmonics information that utilizes and preventing line differential protection in the guard method of the saturated malfunction of CT, to excise line fault fast, and differential protection misoperation when preventing CT saturated.
The present invention is concrete by the following technical solutions.
Harmonic synthesis information prevents a line differential protection method for saturated malfunction, it is characterized in that, described guard method comprises the following steps:
(1) gather line current, utilize the fundametal compoment of line current to carry out line differential protection calculating, when not meeting differential protection operation condition, protection is failure to actuate;
(2) if meet differential protection operation condition, then calculate the harmonic synthesis component Ix of this side electric current further, concrete computational methods are:
Wherein I2 is secondary harmonic amplitude, and I3 is triple-frequency harmonics amplitude, and I1 is fundamental voltage amplitude.；
(3) if Ix>0.15 time, then according to the time delay Tx of Ix numerical value determination Blocking Differential Protection, concrete computational methods are:
Tx=(Ix-0.15) x0.8 second
(4) when Tx delay time to or Ix<0.15 time and meet differential protection operation condition, then allow differential protection action, otherwise Blocking Differential Protection.
The present invention utilizes harmonic synthesis information to prevent the line differential protection method of saturated malfunction to have very high reliability and fail safe; can excise fast CT unsaturated time line areas internal fault; and the issuable misoperation of circuit external area error when can effectively prevent CT saturated, improve the safety and reliability of power system transmission line.
Embodiment
Below in conjunction with example, the present invention is described in further detail.
The present invention is concrete by the following technical solutions.
First utilize line differential protection device to gather the current information at circuit two ends at circuit head end and end, comprise current first harmonics amount I1, second harmonic amount I2, triple-frequency harmonics amount I3.
Utilize the ratio-restrained characteristic of fundamental current component, judge differential protection whether action, if meet differential protection operation condition, then calculate the harmonic synthesis component Ix of this side electric current further, concrete computational methods are:
If Ix>0.15 selects the time delay Tx according to Ix numerical value determination Blocking Differential Protection, concrete computational methods are:
Tx=(Ix-0.15) x0.8 second
When Tx time delay to or Ix<0.15 time and meet differential protection operation condition, then allow differential protection action, send trip operation order, tripping line switching, otherwise Blocking Differential Protection.
The embodiment more than provided is in order to illustrate the present invention and its practical application, not any pro forma restriction is done to the present invention, any one professional and technical personnel, not departing from the scope of technical solution of the present invention, does certain modification according to above techniques and methods and changes the Equivalent embodiments of working as and being considered as equivalent variations.
Claims (1)
1. harmonic synthesis information prevents a line differential protection method for saturated malfunction, it is characterized in that, described guard method comprises the following steps:
(1) gather line current, utilize the fundametal compoment of line current to carry out line differential protection calculating, when not meeting differential protection operation condition, protection is failure to actuate;
(2) if meet differential protection operation condition, then calculate the harmonic synthesis component Ix of this side electric current further, concrete computational methods are:
Wherein I2 is secondary harmonic amplitude, and I3 is triple-frequency harmonics amplitude, and I1 is fundamental voltage amplitude;
(3) if Ix>0.15 time, then according to the time delay Tx of Ix numerical value determination Blocking Differential Protection, concrete computational methods are:
(4) when Tx delay time to or Ix<0.15 time and meet differential protection operation condition, then allow differential protection action, otherwise Blocking Differential Protection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210574938.5A CN103066576B (en) | 2012-12-26 | 2012-12-26 | Circuit differential motion protection method utilizing harmonic summarized information to prevent saturated maloperation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210574938.5A CN103066576B (en) | 2012-12-26 | 2012-12-26 | Circuit differential motion protection method utilizing harmonic summarized information to prevent saturated maloperation |
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| CN103066576A CN103066576A (en) | 2013-04-24 |
| CN103066576B true CN103066576B (en) | 2015-02-25 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106998054B (en) * | 2017-05-24 | 2019-04-16 | 南京国电南自电网自动化有限公司 | A kind of intelligent substation data reliability recognition methods based on information fusion |
| CN110635456A (en) * | 2019-09-02 | 2019-12-31 | 华北电力大学 | A method to prevent the differential protection from rejecting operation caused by faulty inrush current at the converter valve side |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4704653A (en) * | 1985-12-10 | 1987-11-03 | Westinghouse Electric Corp. | Transformer differential relay with speed-up apparatus |
| CN1419326A (en) * | 2002-10-24 | 2003-05-21 | 南京南瑞继保电气有限公司 | Asynchronous method TA saturation detected relay protection method |
| CN101599635A (en) * | 2009-03-17 | 2009-12-09 | 国网电力科学研究院 | The Method of Improving Differential Protection Performance by Distinguishing Sudden Faults and Fuzzy Harmonic Analysis |
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2012
- 2012-12-26 CN CN201210574938.5A patent/CN103066576B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4704653A (en) * | 1985-12-10 | 1987-11-03 | Westinghouse Electric Corp. | Transformer differential relay with speed-up apparatus |
| CN1419326A (en) * | 2002-10-24 | 2003-05-21 | 南京南瑞继保电气有限公司 | Asynchronous method TA saturation detected relay protection method |
| CN101599635A (en) * | 2009-03-17 | 2009-12-09 | 国网电力科学研究院 | The Method of Improving Differential Protection Performance by Distinguishing Sudden Faults and Fuzzy Harmonic Analysis |
Non-Patent Citations (2)
| Title |
|---|
| 变压器差动保护防误动措施研究;郑岗;《中国优秀硕士学位论文全文数据库》;20101015;第1－70页 * |
| 多判据综合的变压器差动保护;杨经超等;《电网技术》;20031031;第27卷(第10期);第66－71页 * |
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Effective date of registration: 20171226 Address after: 100085 Beijing city on the base of the information industry on the street, No. four, No. 9, Haidian District Co-patentee after: Beijing Sifang Jibao Engineering Technology Co., Ltd. Patentee after: Beijing Sifang Jibao Automation Co., Ltd. Address before: 100085 Beijing city on the base of the information industry on the street, No. four, No. 9, Haidian District Patentee before: Beijing Sifang Jibao Automation Co., Ltd. |
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