18. August 2009

Pacific Power Source, Inc. Publishes White Paper on Line Injected Harmonics
Use the White Paper to help synthesize waveforms for simulating AC Test Power applications.

Irvine, CA, August 18, 2009 - Pacific Power Source introduces an informative white paper titled "Line to Line Voltage Considerations with Line Injected Harmonics." The note clarifies why various harmonics injected on individual phases of a waveform may produce unexpected results when observed Line to Line rather than Line to Neutral.

The white paper describes how engineers can use Pacific Power's AMX Series Power Source to synthesize waveforms for applications such as simulating AC power line harmonics and other power perturbations. It outlines how engineers can use the company's UPC 32 Programmable Controller with the Harmonic Analysis and Synthesis (HAS) option, which permits specifying the waveform and amplitude of each phase of a signal independently and creating harmonics through the 50th order. It also illustrates how the company's UPC Software is used to create custom waveforms of varying harmonic content and phase angles. These synthesized waveforms can then be downloaded to the AMX power source for execution. The white paper is extensively illustrated with waveform captures that demonstrate the differences in power line signals that become apparent when observing results as line to neutral rather than as line to line.

The white paper explains why the calculation of line-to-line results, either in harmonic or transient conditions, may not be intuitive. In any three-phase application, a disturbance placed on a single vector will always affect both adjacent phase-to-phase vectors. Careful planning and a thorough understanding of vector addition and line interaction are necessary to fully appreciate the power of Pacific Power's arbitrary waveform capabilities.

These capabilities allow creating line to line results where the integer harmonics can be forced to add to the peak of the waveform. Pacific Power's HAS option also offers the ability to specify the starting phase angle of the harmonic in addition to the harmonic order and percent harmonic. By using three different waveforms that have the same harmonic content but which are offset by the normal 120 degree phase angle, the zero crossing of the harmonic order is moved off the 120 degree point of the fundamental.
About Pacific Power Source
Pacific Power Source, Inc., founded in 1973, is a world leader in high-performance AC Power Sources and Power Conversion Equipment. The company designs and manufactures its products at its headquarters and main facility in Irvine, California, and maintains sales and service centers in China (Shanghai), the United Kingdom (Gilford), and France (Strasbourg). In addition, PPS has a worldwide network of sales representatives and distributors.

Pacific Power Source offers standard products that range in power from 500VA to 625kVA and above. Low-power products include line conditioners, frequency converters and programmable AC power sources. High-power systems include power line conditioners, frequency converters, programmable AC power test equipment, and uninterruptible AC power sources.

Major markets served by Pacific Power Source include Commercial/Industrial and Military, with applications ranging from Research and Development and Manufacturing to Facility Power. Key market segments include Aerospace, Appliances ("Whiteware"), Communications, Computers, Government Laboratories, Lighting, and Test and Measurement Instrumentation. The company's customers include a broad array of domestic, military, and multinational firms with operations throughout the world.


Sum-Sum Chan





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