公开(公告)号：WO1998011448A1

公开(公告)日：1998-03-19

申请号：PCT/US1997014910

申请日：1997-08-25

Applicant: ABB POWER T & D COMPANY INC.

Inventor： ABB POWER T & D COMPANY INC. ,  DICKMANDER, David, D.

IPC: G01R31/08

CPC classification number: G01R31/08 ,  H02H3/081 ,  H02H3/38

Abstract: Apparatus for detecting the direction of a fault in relation to a switch (14) connected between a source (10) and a load (16) includes a voltage sampler and a current sampler for generating voltage and current samples during first and second power cycles. A first comparator (66, 68, 70) compares the current samples from the first and second cycles and determines the sign of the difference between the samples. A second comparator (72) compares the sign of the voltage from the first cycle to the sign of the current difference determined by the first comparator and provides an indication of fault direction. The apparatus also includes a fault inception determiner (46, 50) for providing a fault inception indication determined by comparing the voltage samples from the first and second cycles and detecting the sign of the difference between the samples.

Abstract translation: 用于检测相对于连接在源（10）和负载（16）之间的开关（14）的故障方向的装置包括用于在第一和第二功率周期期间产生电压和电流采样的电压采样器和电流采样器。 第一比较器（66,68,70）比较来自第一和第二周期的当前样本，并确定样本之间的差异的符号。 第二比较器（72）将来自第一周期的电压的符号与由第一比较器确定的电流差的符号进行比较，并提供故障方向的指示。 该装置还包括故障确定器（46,50），用于提供通过比较来自第一和第二周期的电压样本确定的故障启动指示，并检测样本之间的差异的符号。