发明名称 |
FAULTED CIRCUIT DETECTOR HAVING ISOLATED INDICATOR |
摘要 |
A faulted circuit detector (10) having an electrically isolated and remotely positioned indicator (14) detects fault currents in a monitored conductor (18). When a fault of a predetermined magnitude is detected, a light pulse is transmitted from the detector to the indicator via a fiber optic cable (15) where, upon receipt, the pulse is converted to an electrical pulse causing the indicator to indicate a "fault" state. A reset circuit (56) within the indicator resets the indicator at regular intervals to the "normal" state as long as a predetermined minimum voltage is present on the monitored conductor. The detector includes a temperature compensation circuit (150) and low pass filter circuit (160) so as to prevent misoperation due to varying ambient temperatures or high frequency transients. A test circuit (48, 50, 34) is also provided to allow service personnel to field-test the device with the monitored conductor in an energized state.
|
申请公布号 |
CA2086331(C) |
申请公布日期 |
2000.12.19 |
申请号 |
CA19912086331 |
申请日期 |
1991.06.21 |
申请人 |
|
发明人 |
DUNK, MICHAEL P.;RECTOR, GARY D.;BANTING, JOHN F. |
分类号 |
G01R15/14;G01R15/18;G01R15/22;G01R19/165;G01R31/02;G08B21/00;H02H3/04;H02H3/08;(IPC1-7):G01R31/08 |
主分类号 |
G01R15/14 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|