公开(公告)号：US3878460A

公开(公告)日：1975-04-15

申请号：US41180673

申请日：1973-11-01

Applicant: ASEA AB

Inventor： NIMMERSJO GUNNAR

IPC: H02H7/26 ,  G01R31/08 ,  H02H3/22 ,  H02H3/38

CPC classification number: H02H7/265

Abstract: In order to determine the direction of a fault in a power network from the measuring point, each phase of the line is provided with a detector part with a band exclusion filter for removing the part of a signal which has the operating frequency of the network, which signal is proportional to the current at the measuring point, and another band exclusion filter for removing the part of another signal which has the operating frequency of the network, which is proportional to the voltage at the measuring point. A directional detector is fed with the two filtered signals which contain substantially only transients. The output of the directional detector is connected to a tripping relay and a blocking relay.

Abstract translation: 为了从测量点确定电力网络中的故障的方向，线路的每个相位都设置有具有带除滤波器的检测器部分，用于去除具有网络的工作频率的信号的一部分， 哪个信号与测量点处的电流成正比，另一个带除滤波器用于去除与测量点的电压成比例的具有网络工作频率的另一个信号的一部分。