Loss of neutral detecting circuit

Details Loss of neutral detecting circuit Loss of neutral detecting circuit

1991-07-08

1993-03-02

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

361 42, 340652, G08B 2100

Patent

active

051913186

ABSTRACT:
A loss of neutral detector is disclosed. The detector includes a closed loop circuit which has a charge storage device, an output device and a switch in a normally-open position. The switch is controlled by a switch control circuit operatively connected to a loss of neutral detection circuit. The loss of neutral detection circuit detects an electro-magnetic field generated around the neutral lead on increase of the neutral potential via a pull-up resistor on loss of neutral. On detection of loss of neutral, the switch is closed so that the charge storage device energizes the closed loop circuit to activate the output device.

REFERENCES:
patent: 4598331 (1986-07-01), Legatti
patent: 4931893 (1990-06-01), Glennon et al.

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