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专利名称：Method for measuring distance in digital
distance relays
发明人：Yoshida, Takashi c/o MITSUBISHI DENKI K.K.申请号：EP86111050.0申请日：19860809公开号：EP0214483B1公开日：19900516
摘要：A method to detect voltage and current of an electric power system and, basedon the detected values, calculate resistance and inductance of the power transmissionline and thereby to measure the distance from the relay apparatus to the point of thefault of the power transmission line. The voltage (v) and current (i) of the electric powersystem are detected at constant sampling intervals and the thus detected values at thesampling time points from tn to tn+2 are used in the approximate integration
formula:where k, and k2 are constants, and through this approximation the resistance (R)and inductance (L) of the power transmission line as the object of the measurement areobtained, and thus, even when a current including components of different frequencies isflowing through the power transmission line, the distance sought can be measuredprecisely.
申请人：MITSUBISHI DENKI KABUSHIKI KAISHA
代理机构：Eisenführ, Speiser & Partner
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