Читать книгу Alternative Liquid Dielectrics for High Voltage Transformer Insulation Systems - Группа авторов - Страница 30

The liquid insulation in a power/distribution transformer is used for various purposes:

1 A cooling agent – During the operational time, the core and windings get heated, so the liquid insulation helps to transfer the heat outside.

2 An insulating agent – The liquid insulation helps to insulate the different conducting parts of the transformer.

Owing to the concerns regarding environment and sustainability, researchers started looking for other alternate options to the conventional MO [27]. NEOs are a perfect substitute to the conventional MO and other synthetic liquids. These oils are completely biodegradable and nontoxic in nature. However, the downside of using these oils is that they have high pour point, higher viscosity, and oxidize easily. Some of these oils have greater content of unsaturated fatty acids which lowers the viscosity and aids in faster oxidation. Whereas, some others consist of high percentage of saturated acids, which improves oxidation stability. Thus, the oil chosen should be such that it provides a finest balance for smooth operation of an apparatus. Pongamia and jatropha oils are chosen for discussion because of their nonedible nature and they serve as potential substitutes for the conventional MO. Along with them, some other NEOs are also briefly described below.