Power Quality Analyzing in a Power Supply System with a Predominantly Pulsed Load

A nonsinusoidal waveform of power supply voltage in electrical networks is an actual problem due to the widespread use of electronic equipment both in power supply organizations and in electricity consumers. The article considers a study of nonsinusoidality in the 0.4 kV power supply system of a building containing a load with pulse converters. Measurements carried out revealed systematic deviations of the voltage 3rd and 9th harmonic components from their standard values. A correlation dependence between the voltage harmonic component and the apparent power at the fundamental frequency is obtained. The actual shares the power supply network and the consumer's load introduce in the voltage waveform distortion are estimated.