A 7.5-kVA Power Transient Synthesizer

This paper describes newly developed electrical power test equipment called a 7.5-kVA power transient synthesizer. The synthesizer furnishes 7.5-kVA three-phase 120/208-volt power and 5.8-kVA single-phase 120-volt 50/60-Hz power containing a variety of controlled power parameter fluctuations. The output includes continuous undervoltage and overvoltage, momentary under-voltage and overvoltage lasting for 8.3 ms to 5 seconds, power outages lasting for identical durations, sine waves with superimposed pulse voltages, square-wave and frequency changing sinusoidal voltages. The transient susceptibility test made on a dc power supply is presented to illustrate the data obtainable with the synthesizer.