General Electric Company

Siemens Energy & Automation, Inc.

Walter Paul Payack, Jr

Peter J Radusewicz

Carl Kyrk

There is provided a method and a power quality indicator coupled to an electrical circuit. The indicator comprises the summing device configured to received a sensed wave form from the electrical circuit, including at least one voltage wave form. A summing device is configured to provide a summed output voltage. A low pass filter (LPF) is electrically coupled to the summing device and configured to receive a summed output voltage from the summing device. The LPF is configured to provide a LPF voltage. A microprocessor is configured to receive the sum upward voltage the LPF voltage, compute an RMS voltage value for each of the summed output voltage, determine the difference of such RMS voltage values and generate a signal representative of the difference of the RMS voltage values, wherein the signal is proportional to the harmonic content in the electrical circuit.

Power quality indicator

An automatic transfer switch (ATS) controller is disclosed which includes a power supply circuit to regulate and filter input power, a transformer to convert utility and generator power sources into power supply voltages and voltage sensing sources and a voltage sense signal conditioning circuit. Controller further implements a solenoid driver circuit to drive automatic transfer switch solenoids, an embedded microcontroller configured to monitor utility and generator voltages and a user interface interfaced to said microcontroller for operator entry of instructions. A LED indicator is included and is configured to verify user interface entries and overall operation of the controller and ATS system.

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Suwanee, GA, United States of America

Walter Paul Payack, Jr