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《Relay》 2003-08
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Simplify calculation of line protection settings

LIAO Xiao yu,ZHANG Tai sheng,DU Ling,YAN An he,CHENG Peng (Henan Power Dispatching & Communication Center,Zhengzhou 450052,China)  
All 220 kV lines of Henan power system use computer based protection.According to this,this paper analyzes the requirements of calculation rules issued by Ministry of Electric Power and the real roles of various line protections.Finally,some methods to simplify setting calculation works for system protections are given:canceling the application of zero sequence overcurrent Ⅰ protection;simplifying the setting calculation method of zero sequence overcurrent Ⅳ protection and unifying the setting value of the grounding distance and the phase distance protections.
【CateGory Index】: TM77
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