This guide deals with the distribution transformer construction (core, windings, cooling, tank & cover, conservator, pressure relief device, Buchholz relay, silica gel breather, winding temperature indicator, etc. ), transport & packing & despatch, installation procedure, fittings & accessories. Equipment inside usually includes isolating switches, circuit breakers, and residual current devices (RCDs). Supplies power to specific buildings or floors. Equipped with larger three-phase circuit. What is a Distribution Transformer? Definition: A distribution transformer is also known as a typical kind of isolation transformer. In the distribution. The electricity supply chain consists of three primary segments: generation, where electricity is produced; transmission, which moves power over long distances via high-voltage power lines; and distribution, which moves power over shorter distances to end users (homes, businesses, industrial sites. When placed either at ground level or underground, distribution transformers are mounted on concrete pads and locked in steel cases, thus known as distribution tap pad-mounted transformers. Distribution transformers typically have ratings less than 200 kVA, although some national standards. A primary distribution substation is the connection point of a distribution system to a trans-mission or a sub-transmission network.