Southern California Edison

Other

Southern California Edison Company

Manuel R Cabison

Dorr Kimball

Michael G Cox

Juan P Lopetrone

Kevin C Sullivan

Tom Baker

Isidor Kerszenbaum

An analyzer for performing high and low voltage tests on an electric induction machine having electric power input terminals. The analyzer comprises: (a) a high voltage testing circuit for performing high voltage tests on the induction machine; (b) a low voltage testing circuit for performing low voltage tests on the induction machine; (c) electrical terminals for electrical connection with the power input terminals of the induction machine; (d) a plurality of switches electrically connecting the high voltage testing circuit and the low voltage testing circuit to the terminals, each switch having one or more control input terminals for receiving control signals for closing and opening the switch; and (e) a controller having a first set of output terminals electrically connected to the control input terminals of the switches, the controller providing control signals to the switches to selectively open one or more of the switches and to selectively close one or more of the switches to: (i) provide electrical conduction paths between the high voltage testing circuit and the induction machine through the closed switches, while electrically isolating the low voltage testing circuit from the high voltage testing circuit through the open switches; and (ii) provide electrical conduction paths between the low voltage testing circuit and the conduction machine through the closed switches, while electrically isolating the high voltage testing circuit from the low voltage testing circuit through the open switches.

Electric motor analyzer

Apparatus for the detection of ground leakage in a normally ungrounded DC system includes a DC power supply and conductors from the supply for supplying power to a load connected to the DC system. There is an indicator connected between the DC system and a ground point such that a ground leakage in the system closes a circuit to activate the indicator. With such activation, a pulser periodically interrupts the circuit to effectively generate an interrupted ground fault signal. Such signal is detected by a sensor located relative to the DC system such that an interrupted ground signal detected by the sensor locates the ground fault. Noise introduced into the pulse signal by the periodic interruption of the circuit during the ground fault occurrence is suppressed by the sensor means.

DC ground fault detection

Apparatus for the detection of ground leakage in a normally ungrounded DC system includes a DC power supply and conductors from the supply for supplying power to a load connected to the DC system. There is an indicator connected between the DC system and a ground point such that a ground leakage in the system closes a circuit to activate the indicator. With such activation, a pulser periodically interrupts the circuit to effectively generate an interrupted ground fault signal. Such signal is detected by a sensor located relative to the DC system such that an interrupted ground signal detected by the sensor locates the ground fault. Noise introduced into the pulse signal by the periodic interruption of the circuit during the ground fault occurrence is suppressed by the sensor.

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San Gabriel, CA, United States of America

Manuel R Cabison