The purpose of this guide is to provide power transformer paralleling users with an easily accessible source for comparing control methods for 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.This paralleling guide describes and compares control methods of paralleling power transformers equipped with load tap changers (LTC) or series regulators. 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, and typical misapplication consequences. This guide describes field commissioning activities, troubleshooting procedures and the provision of adequate backup protection.
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