A high-resistance ground fault relay protection system for transmission lines
A high-resistance ground fault, relay protection technology, applied in the direction of fault location, emergency protection circuit device, fault detection according to conductor type, etc., to achieve the effect of ensuring reliability
Active Publication Date: 2021-08-31
GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology
[0004] In order to solve the problem that the existing method of eliminating the influence of transition resistance on the distance protection of transmission lines cannot combine the simplicity of field application and the reliability of actual protection, the present invention proposes a high-impedance ground fault relay protection system for transmission lines, which can be flexibly configured. It does not affect the operation of the original relay protection, and ensures that the protection can operate correctly even in the event of a high-impedance ground fault on the transmission line
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[0029] The accompanying drawings are for illustrative purposes only and cannot be construed as limiting the patent;
[0030] In order to better illustrate this embodiment, some parts in the drawings will be omitted, enlarged or reduced, and do not represent the actual size;
[0031] For those skilled in the art, it is understandable that some well-known descriptions in the drawings may be omitted.
[0032] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0033] Such as figure 1 As shown, the transmission line high-impedance ground fault relay protection system proposed by the present invention takes the transmission line MN in the substation as an example, see figure 1 , a high-resistance grounding fault occurs at a point k between the transmission lines MN, where M is used as the side of the computer protection device x at one end of the transmission line MN, N is the opposite s...
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The invention proposes a high-resistance grounding fault relay protection system for transmission lines, which relates to the technical field of power system relay protection, and solves the problem that existing methods for eliminating the influence of transition resistance on transmission line distance protection cannot combine the simplicity of on-site application and practicality. To solve the problem of protection reliability, the present invention is based on the cooperation of the relay protection current data acquisition part, the relay protection current data processing part and the export drive part, which can timely confirm the occurrence of high-resistance grounding faults of transmission lines and ensure relay protection The reliability of the protection action is independent of the original transmission line microcomputer protection of the transmission line. The original formed protection device is not changed, and the operation of the original protection is not affected. It can be quickly put into the actual smart substation.
Description
technical field [0001] The invention relates to the technical field of relay protection of power systems, and more specifically, to a high-impedance ground fault relay protection system for transmission lines. Background technique [0002] When a single-phase ground fault occurs on the transmission line, the traditional distance protection has a low tolerance to the transition resistance. When a high-impedance ground fault occurs, the distance protection is prone to overshoot and refuse to operate, which is not conducive to ensuring the operation of the distance protection. accuracy. [0003] The traditional transmission line distance protection usually needs to sample the bus voltage and line three-phase current, and protect by comparing the measured impedance value with the action characteristic impedance, which is greatly affected by the transition resistance; in order to eliminate the impact of the transition resistance on the distance protection, the current The method...
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IPC IPC(8): H02H7/26G01R31/08G01R31/52
CPCG01R31/085G01R31/088G01R31/52H02H7/26
Inventor 林鸿昊廖颖欢胡浩莹王晓明罗宗杰易水平叶鹏运喻凌立许超尧黄嘉瑜陈臻麦成瀚吴镇傅智浩刘水根
Owner GUANGDONG POWER GRID CO LTD