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http://dx.doi.org/10.5207/JIEIE.2014.28.4.021

A Study for Improving the Power Factor of Distribution Transformer using Condenser Control Circuit  

Lee, Kwang-Jeek (Dept. of Electronics and IT Media Engineering, Seoul National University of Science and Technology)
Publication Information
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers / v.28, no.4, 2014 , pp. 21-28 More about this Journal
Abstract
Daily use characteristics of apparent power supplied to distribution transformer can be separated into two different time zone of waking hours and sleeping hours. In sleeping hours, using amount of power is decreasing. The actual curve of power seemed to be quite similar to this kind of separation. Inserting a condenser into a circuit in each different time zone led to maximize power factor of the transformer. The compensating condenser's on/off time is controlled by hysteresis circuit utilizing op amp and power factor of the transformer was improved from 0.945 to 0.999. As a result, the average of current reduction was 2.53A per hour of transformer.
Keywords
Pole Tr.; Power Factor; Reactive Power; Hysteresis Circuit;
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