A new measurement method for testing a 400 kV circuit breaker

This article presents results of high voltage (HV) 400 kV circuit breakers (CB) testing in high induction environment. The most common case of new HV circuit breakers installation is replacement of old circuit breakers in existing power plants or substations. After installation and before energization of any HV equipment it is needed to test and assure the functionality. A circuit breaker, as an important and complex element, needs to be tested according to IEC 62271-100 standard on the site. The test procedure was carried out using direct current (DC) on the terminals of CB. Recorded signal was an error duo to impact of strong voltage induction in the conditions of CB testing. This paper proposes the new method for assessment of mechanical parameters of HV circuit breakers.