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A Method of Improving Operation Performance of Current Differential Protection of Series Compensation Line

A technology of differential protection and action performance, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as poor action performance and protection refusal to operate, reduce the risk of refusal to operate, improve reliability, and increase the amount of action Effect

Active Publication Date: 2017-03-08
NORTH CHINA GRID +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a method for improving the operating performance of the current differential protection of the series-compensated line. Poor action performance and even protection may refuse to move

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  • A Method of Improving Operation Performance of Current Differential Protection of Series Compensation Line
  • A Method of Improving Operation Performance of Current Differential Protection of Series Compensation Line
  • A Method of Improving Operation Performance of Current Differential Protection of Series Compensation Line

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Embodiment Construction

[0013] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0014] The invention provides a method for improving the operating performance of the current differential protection of the series-compensated line; the method improves the existing current differential protection criterion, increases the action sensitivity of the protection, effectively reduces the risk of protection rejection, and improves protection reliability.

[0015] Such as figure 1 A...

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Abstract

The invention discloses a method for improving current differential protection motion performance of a series compensated line. The method comprises the steps that S1, after the series compensated line goes wrong and current differential protection is started, a first fault current and a second fault current on two sides of a fault point of the series compensated line are collected; whether the first fault current and the second fault current meet a protection criterion is judged, and if yes, current differential protection motions are conducted, and a circuit breaker trips; if not, the current differential protection motions are not conducted. According to the method, By the adoption of the protection criterion, when a system operates normally and alternatively external faults occur, the amplitudes of the currents on the two sides of the line are close to each other, the motion increment of the portion is close to zero, and the false action risk cannot be increased; when internal faults occur, because faults of current reversal of the series compensated line are all faults of fault points close to a series compensated installation position, the difference between the amplitudes of fault currents on the two sides is large, so that the motion increment of the portion can effectively increase the motion quantity, protection motion sensitivity is improved, the motion rejection risk is lowered effectively, and protection reliability is improved substantially.

Description

technical field [0001] The invention belongs to the technical field of relay protection for AC power transmission systems, and more specifically relates to a method for improving the operating performance of series-compensated line current differential protection. Background technique [0002] The installation of series capacitor compensation devices on transmission lines can improve the transmission capacity and system stability of ultra-high voltage long-distance transmission lines, and has a certain adjustment effect on the power flow distribution on transmission channels, so it has been more and more widely used. The device connected in series in the transmission line for the purpose of compensating the inductive reactance of the line, consisting of capacitors and their control and protection equipment, is called a series capacitance compensation device, or series compensation for short. The series compensation line refers to the transmission line equipped with a series ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 罗深增王宁刘一民杜鹃杨慧敏李银红
Owner NORTH CHINA GRID
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