发明名称 |
Fault indicator having delayed trip circuit |
摘要 |
A reset coordinated fault indicator for indicating the occurrence of a fault current in a monitored conductor includes an electrically actuated indicator flag. A trip circuit within the fault indicator impulses the indicator flag from a normal reset-indicating state to a fault-indicating state following the occurrence of a fault current in the conductor. A reset circuit periodically impulses the indicator flag to the reset-indicating state upon restoration of power to the conductor. To preclude simultaneous actuation of the trip and reset circuits and consequent failure of the indicator flag to register a fault, the trip circuit, upon the occurrence of a fault, first actuates the reset circuit to render the reset circuit inoperative, and then actuates the indicator flag to provide a fault indication.
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申请公布号 |
US4795982(A) |
申请公布日期 |
1989.01.03 |
申请号 |
US19870042282 |
申请日期 |
1987.04.24 |
申请人 |
SCHWEITZER, JR., EDMUND O. |
发明人 |
SCHWEITZER, JR., EDMUND O. |
分类号 |
G01R31/08;(IPC1-7):G01R31/02 |
主分类号 |
G01R31/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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