engleski

How to Prevent Transformer Bushing Failures?

About a quarter of all transformer failures are caused by bushings and they are the most common reason of transformer fire with collateral and ecological damages. That situation can be prevented by applying off-line and on-line bushing monitoring, especially by measuring of capacitance C and dielectric dissipation factor tand. The investigation of temperature dependence of C and tand were implemented on specially designed models with different moisture contents in the insulation and during artificial ageing. New criteria for diagnostics of OIP bushing insulation system condition, applicable to off-line and on-line monitoring, based on investigation results and a broad experience with bushings diagnostics, are proposed.

bushing; failure; capacitance; tand; diagnostics; monitoring; power transformer

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