Influence of Failure Causes of Distribution Substation Power Circuit on Power Supply Reliability

The authors analyze major types of distribution substation electric equipment and their failure causes as well as the methods of alarm conditions diagnostics and prevention have been studied. Expert evaluation of reliability of distribution substation electric equipment was conducted and the share of various failures of distribution substation electric equipment was determined. The origins and the share of various types of failures for 10 kV disconnectors were defined. Currently operated 10 kV power distribution lines were investigated, and damage in networks and electric energy undersupply were calculated with the aim to specify negative features of VMP-10 circuit breaker affecting network reliability (with the use of data reported by B. Neklepaev). The processes of failure development in 10 kV disconnectors, as well as their origins and alarm consequences were studied through the example of VMP-10 circuit breaker.