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P1538a - Guide for Determination of Maximum Winding Temperature Rise in Liquid-Filled Transformers Amendment a

This guide provides a basis for the transformer manufacturer and user to concur that a transformer meets the temperature requirements in C57.12.00. Those requirements state that the maximum winding temperature rise shall be determined by either direct measurement or calculations. This guide describes the requirements for a manufacturer's test program or mathematical model to demonstrate compliance with those requirements.This amendment expands the clause that addresses direct measurement by fiber optic detectors and adds an annex detailing installation techniques for fiber optic probes. References are also updated.
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