THE BASIS FOR PERFORMING INSULATION POWER-FACTOR TESTING ON LARGE CAST-COIL TRANSFORMERS

摘要

This article discusses the industry basis and value of performing an insulation power-factor test on dry-type transformers, specifically the cast-coil design. The basis for performing this test as outlined in the industry standards is discussed. The value of performing the test based on the transformer application, site conditions, and customer objectives is presented. The intent is to provide insight into when it is prudent to apply insulation power-factor testing to dry-type transformers.