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Transformer Bushings: External Insulation and Current-Carrying ComponentsTransformer bushings are the primary external insulation devices mounted on the transformer tank. The leads from the transformer windings must pass through these insulating bushings, which provide insulation between the leads as well as between the leads and the transformer tank, while also serving to mechanically secure the leads.Depending on the voltage level, transformer bushings are available in several types: porcelain