Transformer interface for preventing EMI-based current...

Details Transformer interface for preventing EMI-based current... Transformer interface for preventing EMI-based current...

2008-05-20

2008-05-20

Leja, Ronald W (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

Reexamination Certificate

active

11091213

ABSTRACT:
A transformer interface prevents a false ground fault interrupt in a power supply arrangement. The power supply arrangement has a line wire and a neutral wire connected by way of a ground fault interrupt circuit to an electrically powered device, to which a ground wire is also coupled. The interface has current imbalance sensor transformer windings coupled to the line and neutral wires. A ground wire current sensor transformer winding is coupled to the ground wire. A detector transformer winding produces a signal that triggers operation of the ground fault interrupt circuit, in response to the difference between currents produced by the current imbalance sensor transformer windings exceeding detected ground wire current by a prescribed value.

REFERENCES:
patent: 3506906 (1970-04-01), Nestor
patent: 3611035 (1971-10-01), Douglas
patent: 4667262 (1987-05-01), Maier
patent: 4931894 (1990-06-01), Legatti

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