Ground fault indicating device

Details Ground fault indicating device Ground fault indicating device

1990-09-27

1992-01-21

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

340650, 73170R, 324 72, G01W 100

Patent

active

050831143

ABSTRACT:
A current transformer detects a ground fault current and outputs a secondary current signal to heat a filament disposed in an airtight flash lamp upon the occurrence of a ground fault. With heating of the filament, an ignition material is ignited in the lamp and causes weakening of the glass bulb of the lamp. A moving member pressing against the lamp shatters the weakened lamp and is displaced, thus releasing an indicator to project from a holder to a ground fault indicating position.

REFERENCES:
patent: 3891919 (1975-06-01), Penninger
patent: 4276576 (1981-06-01), Uman et al.

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