INDOOR SUBSTATION
Indoor Substation - 110 / 13 KV Indoor Substation A substation in which the apparatus is equipped inside the substation building is called indoor substation. Such type of substation is mainly used for the voltage up to 11000 v, but when the surrounding air is contaminated by impurities such as metal corroding gases and fumes, conductive dust, etc., their voltage can be raised up to 33000 V to 66000 v. The indoor substation is subdivided into several compartments like control compartment, indicating and metering instruments and protective device compartment main bus-bar compartment, current transformer and cable sealing box compartment as shown in the figure below. The switch gear on the supply or primary side will consist of oil circuit breaker only. The high voltage supply is given to the primary of the transformer through a circuit breaker. From the bus bar, various feeders emerge out. The panel on each feeder consists of an isolator switch and a circuit breaker. In additi...