发明名称 Method for measuring distance in digital distance relays.
摘要 <p>A method to detect voltage and current of an electric power system and, based on the detected values, calculate resistance and inductance of the power transmission line and thereby to measure the distance from the relay apparatus to the point of the fault of the power transmission line. The voltage (v) and current (i) of the electric power system are detected at constant sampling intervals and the thus detected values at the sampling 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 are obtained, and thus, even when a current including components of different frequencies is flowing through the power transmission line, the distance sought can be measured precisely.</p>
申请公布号 EP0214483(A1) 申请公布日期 1987.03.18
申请号 EP19860111050 申请日期 1986.08.09
申请人 MITSUBISHI DENKI KABUSHIKI KAISHA 发明人 YOSHIDA, TAKASHI C/O MITSUBISHI DENKI K.K.
分类号 G01R31/08;H02H3/40;H02H7/26;(IPC1-7):G01R31/08 主分类号 G01R31/08
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