Electronic thermal protection device

Details Electronic thermal protection device Electronic thermal protection device

1995-03-07

1997-05-06

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361103, H02H 318

Patent

active

056277148

ABSTRACT:
Electronic device for thermal protection of a load (M) by cutting off the polyphase power supply to said load, including current transformers (Ti.sub.1, Ti.sub.2, Ti.sub.3) installed on the wires (L.sub.1, L.sub.2, L.sub.3) of the polyphase line supplying power to said load and connected to an electronic processor circuit (3) adapted to generate a command, characterized in that the outputs of the current transformers (Ti.sub.1, Ti.sub.2, Ti.sub.3) are connected to detector means (51, 52, 53) which supply to the processor circuit (3) logic signals the levels of which depend on the direction or the magnitude of the output current of each current transformer.

REFERENCES:
patent: 4751653 (1988-06-01), Junk et al.

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