Improved zero-sequence reactance relay protection device and method
A relay protection and zero-sequence reactance technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as fault protection malfunction outside the forward zone, refusal to operate fault protection in the forward zone, and fault malfunction in the protection zone. , to achieve the effect of solving the in-phase point" problem
Active Publication Date: 2015-04-08
NARI TECH CO LTD
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[0004] The purpose of the present invention is to solve the problem of "same-phase point" existing in the traditional zero-sequence reactor, that is, the zero-sequence reactance relay in the distance protection of the power receiving side will have positive out-of-zone fault protection when the transition resistance increases to a certain value Misoperation, fault protection in the forward zone refuses to operate, and further solves the contradiction between the ability of the zero-sequence reactance relay to withstand the transition resistance in the application and the "same phase point" problem, that is, it solves the problem of "same phase point" due to the "same phase point" "On the premise of the fault misoperation outside the protection zone, it ensures that the protection has sufficient ability to withstand the transition resistance, and improves the operating performance of the traditional zero-sequence reactance relay
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[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, and to make the above-mentioned purpose, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings .
[0030] figure 1 It is a schematic diagram of the overall structure of the zero-sequence reactance relay protection device proposed by the present invention. The zero-sequence reactance relay protection device includes a zero-sequence reactance relay 1 , an auxiliary ohmic impedance relay 2 and a protection logic control circuit 3 . Among them, the action equation of zero-sequence reactance relay 1 is 180°Y / I 0 ]0 is the zero-sequence current at the place where the protective device is installed, U Y =U-Z Y · I, U Y is the working voltage, U is the protection measurement voltage at the installation place ...
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The invention provides a zero-sequence reactance relay protection device which comprises a zero-sequence reactance relay, an auxiliary ohmage relay and a protection logical control circuit, wherein the zero-sequence reactance relay and the auxiliary ohmage relay are used for judging whether to execute a protection action or not according to a predetermined action equation, and the protection logical control circuit is used for making a final judgement of whether to execute the protection action or not according to a judgement result of the zero-sequence reactance relay and the auxiliary ohmage relay. According to the improved zero-sequence reactance relay protection device and a method, advantages of the auxiliary ohmage relay and the zero-sequence reactance relay are fully utilized, and based on combination of the auxiliary ohmage relay and the zero-sequence reactance relay, the zero-sequence reactance relay is protected to achieve a transition resistance tolerating capacity when internal faults happen, the auxiliary ohmage relay is protected to achieve reliable operation performance when external faults happen, and the in-phase point problem on an electric incoming side is solved.
Description
technical field [0001] The invention belongs to distance protection in power system line protection, and in particular provides a zero-sequence reactance relay protection device and method in quadrilateral characteristic distance protection. Background technique [0002] Distance protection is one of the most widely used protections in high-voltage transmission lines, and the reliability of its action has a significant impact on the reliability of backup protection for high-voltage transmission lines. Especially in recent years, with the emergence of a large number of high-voltage short lines in the power grid structure, the grounding distance protection principle that can reflect large transition resistance faults has received more extensive attention and research. [0003] In distance protection, it is necessary to consider both the ability of the protection to withstand transition resistance and the problem of static overriding action, so that when the protection is short...
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IPC IPC(8): H02H7/26
Inventor 郑玉平许磊吴通华
Owner NARI TECH CO LTD