Reliability Modelling and Analysis of Distribution System Considering Weather Effects on Substation and HVDS Concept on Feeder

Abstract

A radial distribution system consists of 33/11 kV substation, 11 kV circuit breaker, 11 kV feeder, 11 /0.4 kV
distribution transformer, 0.4 kV distributor, service wires and load points. The reliability of distribution system has
significant effect on the reliability of overall power system network. The reliability of 33/11 kV substation depends on the
reliability of its components like power transformers, circuit breakers , bus bars and also operating weather conditions.
The reliability of radial feeder depends on reliability of its components like distribution transformer, fuses,
disconnectors, operating conditions of distributor like its length and voltage levels. In this paper the reliability of
substation is calculated assuming either all the faults occur in normal weather or in adverse weather. Thelow voltage
radial feeder is converted into high voltage feeder and their reliability performance is evaluated. Further, the reliability
of the complete distribution system is evaluated for all the above said conditions.