How Distribution Transformers are Manufactured

Distribution transformers are manufactured exclusively of grain oriented steel put together with interleaved joints and fastened with bout steel reinforcement in order to reduce the hum to a minimum and mitigate miscellaneous losses. This type of power transformer contain windings of soft electrolytic copper, insulated by pure cellulose paper of concentric moored type so that it may withstand the stresses coming from short circuit. An oil filled transformer will generally be constructed with large cooling ducts which allow an easy oil circulation. Various fittings and accessories can be included with any transformer. A Buchholz relay and thermometer with electrical contacts is available, which are used for signalizing and releasing the transformer in case of damage.