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C57.166 - Guide for Acceptance and Maintenance of Insulating Liquids in Transformers and Related Equipment

To assist the user of the equipment in evaluating insulating liquids: * As received from unused insulating liquid supplier prior to processing and/or filling into equipment. * Received in new equipment filled prior to energization. * In service-aged equipment. This guide also discusses the following related in insulating liquids: * Test methods and their significance * Methods of handling and storage * Mixtures of insulating liquids * Health and environmental care procedures * Re-processing, re-claiming and replacement This guide does not cover dissolved gas analysis of insulating liquids, which is covered by other IEEE Standard Guides.
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