公开(公告)号：JPH0696839A

公开(公告)日：1994-04-08

申请号：JP11503493

申请日：1993-05-17

Applicant: BIO RAD LABORATORIES

Inventor： CHIYAARUZU DABURIYU RAGUSUDAAR

IPC: G01R31/02 ,  G01R15/14 ,  H01T15/00 ,  H02H1/00 ,  H05B3/00 ,  H02M1/00

Abstract: PURPOSE: To provide an inexpensive arc detecting system which has fewer components by providing a method for separating electric power which maintains arc when an arc detector detects arc generated on electric system. CONSTITUTION: A current transformer 14 measures current amplitude of a line 12 and outputs current signals proportional to the amplitude. Unnecessary frequency components are removed from the signals using a higher-region filter 16 and a lower-region filter 17. An amplifier 18 converts an arc pulse contained in passing region to a pulse having a steep clock edge, and inputs it into an accumulator 19. The accumulator 19 outputs a detection signal to a node 24 when it accumulates a predetermined threshold related to number of clock edges. The signal from the node 24 is input into a luminescent diode D1 and a solid relay 22, and operates the diode D1, and the relay 22 cuts a circuit 13 which supplies electric power to an electric system. This provides an inexpensive arc detecting system which has fewer components.