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Description / Abstract:
This paralleling guide describes and compares control methods of
paralleling regulating transformers. The control methods include:
master/follower, circulating current, power factor, circulating
reactive current, and negative reactance methods. This guide
presents operating philosophy descriptions, sample wiring diagrams,
typical operational variations, the provision of adequate backup
protection, and typical misapplication consequences. This guide
does not apply to phase-shifting regulating transformers.
Purpose
The purpose of this guide is to provide power transformer
paralleling users with an easily accessible source for comparing
control methods of transformer paralleling. This comparison allows
the proper choice of control method and proper operation to best
maintain proper system operations. The guide also provides an
operational understanding to assist in the analysis of changing
system configurations on paralleling operations.