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《Automation of Electric Power Systems》 1981-06
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Performance of Polyphase Ground Distance Relay:Its Analysis and Digital Computation

Yu Mingyuan  
Ground distance relay, operating on the principle of phase Comparison of three-phase compensated voltages and zero sequence current and allowing larger grounding resistance, i s more appropriate for short line ground fault protection than mho relay.This paper analyzes the performance of this type of relay in case of ground faults, especially its directional feature, overreach during power swing, phase shift influence of zero sequence infeed current and the effect of arc resistance between faulty phases. The conclusion of analysis is checked with the calculation result of a digital computer.
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