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Silicone oil has merits of less flammability and excellent environment-friendliness. High-viscosity silicone oil of 50 cSt has been widely applied to power and distribution transformers. Recently, application of low-viscosity silicone oil of 20 cSt to transformers has been considered for its excellent cooling performance. Detection of incipient fault conditions in low-viscosity silicone oil immersed...
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