Abstract
Natural ester dielectric fluid is being adopted at an accelerated speed globally. Even use of IEC 60076 part 14, 2013 Annexes C.2 table is being referred and used as guideline for design. Most of transformers with natural ester are sealed from external oxygen and water by various means.Manufacturer of natural ester do not advise to use natural ester fluid in free breathing application. Even On Load Tap Changer (OLTC) manufacturer has limited study with natural ester but few Asian OLTC manufacturers have done significant study and proved increased contacts life & significantly less maintenance when OLTC are filled with natural ester fluid.Here author collected all global data & did detail on site case study of transformer running successfully with OLTC in free breathing application in India. This transformer is monitored for fluid performance every year by original equipment manufacturer (OEM) of transformer.This paper presents case study of monitoring and validation of results for Free breathing transformers with Natural ester fluid. Electrical Parameters monitored.
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