Eaton Corporation

Eaton Corportion

Ronald T Zipagan

Mark Faulkner

A drive circuit, such as an electronic trip device, is for a shunt trip coil of a network protector. The drive circuit includes an alternating current input adapted to receive an alternating current voltage and a first half-wave rectifier adapted to provide a plurality of direct current voltages from the alternating current input. An energy store, such as a plurality of electrolytic capacitors, is adapted to provide a first direct current output from the direct current voltages of the first half-wave rectifier. A sensor circuit monitors the alternating current input and the first direct current output and provides a second output from one of the alternating current input and the first direct current output. A second full-wave rectifier responds to the second output and the trip signal to provide a third direct current output adapted to drive the network protector shunt trip coil.

Trip coil drive circuit and electrical switching apparatus including the same

A voltage sensing device automatically scales the source and network phase voltages of a power distribution system having one of two operating voltages for input to a network protector relay and also automatically scales a voltage for operating the trip and close circuit of the circuit breaker in the network protector. A latching tap select relay only switches the system voltages to the lower operating voltage input taps of step down transformers after a short delay if all the system voltages are in the lower operating range. A diagnostic circuit verifies proper switch position and voltages before closing output contacts to connect the scaled voltages to the relay and circuit breaker.

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Greenwood, SC, United States of America

Ronald T Zipagan