S&c Electric Company

Marshall Mauney

A system and method for clearing overcurrent in a power distribution network. The network includes a feeder, a lateral line coupled to the feeder, a lateral line current interrupting device provided where the lateral line is coupled to the feeder, a plurality of service lines coupled to the lateral line, a distribution current interrupting device provided where a service line is coupled to the lateral line and a distribution transformer provided at each location where a service line is coupled to the lateral line. The method includes setting an operating time of the lateral line interrupting device to be longer than an operating time of the distribution interrupting devices, detecting overcurrent by the lateral line interrupting device and at least one of distribution interrupting devices, and operating the at least one the distribution interrupting device and not operating the lateral line interrupting device in response to detecting the overcurrent.

System and method for eliminating nuisance fuse operation associated with medium voltage distribution transformers

A transformer fault detection, where the transformer includes a primary winding coupled to a medium voltage power line and a secondary winding providing a stepped down voltage of the medium voltage. The detection system includes a switching device, where the switching device includes a first voltage measuring device for measuring the voltage on the primary winding, a controller for processing measured voltages and a transceiver for receiving and transmitting messages. The detection system also includes a second voltage measuring device for measuring the stepped down voltage on the secondary winding, where the second voltage measuring device includes a transmitter for transmitting the measured step down voltage to the switching device. The controller uses the measured voltages to calculate a transformer turns ratio (TTR) of the transformer to determine whether a transformer fault.

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West Bend, WI, United States of America

Marshall Mauney