(1) The influence of transformer design on the performance of transformer oil in operation: the inter-turn distance of transformer coils and the distance between high and low voltage coils are related to the strength of transformer power plant, while the electric field strength affects the oxidation stability of transformer oil; The size of the transformer body affects the oil loading of the transformer; The design of cooling mode is directly related to the operating temperature and circulation speed of transformer oil, thus affecting the oxidation stability and electrical performance of transformer.
(2) Quality of new oil: It is recommended to use high-quality transformers to ensure a long service life. It is suggested to ask the oil supplier for the product certificate, sample and verify the typical quality data of the purchased oil, and keep these original data for comparison of sampling data in operation, which is very important for judging the changing trend of oil. Note that when the purchased transformer oil needs to be mixed with the original unused oil, it should be tested in strict accordance with GB/T 14542 "Guidelines for Maintenance and Management of Transformer Oil in Operation", and the mixed oil can only be used after passing the test.
(3) Influence of transformer operating conditions on the performance of transformer oil in operation: The most important factor affecting the performance of transformer oil in operation is the operating conditions of transformer. Excessive operating temperature, local overheating, partial discharge and air leakage of transformer will accelerate the thermal oxidation reaction of transformer, thus further affecting the electrical properties of transformer oil.
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