The Research And Development On The Microcomputer Relay Protection For 500kV Substation

The relay protection devices are very important for H.V. networks operating safely andsteadily. With the development of the computer technology, the microcomputer relayprotection devices have been widely used in the fields of H.V. networks.This paper is based on the reformation engineering foe a 500kV substation, whichanalyzes the specific characteristics of super H.V. networks and supplies an overalldisposition plan for the integrated automation substation. Starting with a fault transient coursein the H.V. networks, this paper expounds the hardware construction, read analog input andalgorithmic on microcomputer protection. Based on the analyses of routine protectionprinciples, the paper expounds primary protection principles and implementation methods forthe super H.V. networks or devices, and makes balances of advantages and shortcomings ofvarious principles. Meanwhile, the paper approaches the development trends of themicrocomputer protection.The paper also expounds various interference influences when the microcomputerprotection devices are installed in a high magnetic field, and expounds how to prevent thisinterference to improve the reliability of the microcomputers.