发明名称 CURRENT DIFFERENTIAL TYPE PROTECTIVE RELAYING DEVICE
摘要 PURPOSE:To prevent error operation by computing suppressed quantity to every wave and making logical product of the computing results the final output, from the fact that either positivie wave or negative wave in transformer of error current becomes big.
申请公布号 JPS52145754(A) 申请公布日期 1977.12.05
申请号 JP19760062326 申请日期 1976.05.31
申请人 HITACHI LTD 发明人 AOKI YASUO
分类号 H02H3/28;H02H3/32;H02H7/00;H02H7/22 主分类号 H02H3/28
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