roadshow bus

William Yu: Tutorial Trainer

William Yu of OMICRON is leading three training sessions at the 2014 IEEE PES Transmission and Distribution Expo. A training and application engineer, Yu's experiences include performing various primary tests on power transformer, instrument transformer and power cable.

Yu is presenting A New Approach for Testing Instrument Transformers on OMICRON's Roadshow Bus in Booth #2739. One session is left for today, at 12:30 p.m. Yu also presented the same tutorial on Tuesday and Wednesday of the IEEE PES show.

The tutorial will look at determining the current ratio error and phase displacement of the current transformer (CT) or voltage transformer (VT). Typically the primary injection method is used, especially for the ones with metering accuracy. This conventional method uses nominal primary current/voltage to energize the primary side of CT/VT and measures the secondary current/voltage with standard burden connected. With this, the load-dependent ratio error and the phase displacement can be measured.

However, due to the requirements of high voltage and current sources, this conventional method is subject to many practical limitations, in particular to on-site measurement. New innovative test methods have been invented that make CT or PT testing so much easier than before. Learn about how the new approach evaluates the accuracy class, ratio error and phase displacement of instrument transformers according to the IEEE, ANSI and IEC Standards.

Yu received his BEng(Hon) degree and his MSc degree from the Hong Kong Polytechnic University in 2006 and in 2010 respectively. In 2006, he joined OMICRON electronics Asia in Hong Kong and was responsible for technical and application support for both primary and secondary testing in Asia-Pacific. In 2008, with sales and application support responsibilities, he conducted many training programs and performed field demonstrations in different countries.


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