Analisis Pengujian Kinerja Generator Circuit Breaker (GCB) Unit 1 PT.PLN (Persero) UPK Sebalang Sebelum dan Setelah Maintenance

Generator Circuit Breaker (GCB) is a circuit breaker that connects electrical energy between the generator of a generator and the electrical network system. Circuit breaker is an electrical device that functions automatically to prevent damage to the electrical circuit due to ashort circuit,overload, andgrounding. faults. This research method was obtained through direct observation and reading the manual book of PT. PLN (Persero) UPK Sebalang unit 1 which is located at Lintas Sumatera Street Km. 22 Sebalang Hamlet, Tarahan Village, Katibung District, South Lampung Regency. The purpose of this study is to find out the results of the analysis of the performance testing of GCB unit 1 PLTU Sebalang both before and after maintenance. The results of the research and analysis of GCB unit 1 PLTU Sebalang changed after maintenance, so that the performance value of the simultaneous contact for the position open was 50%, theposition closed was 46%, the contact resistance for the R phase was 23.5%, the S phase resistance value was 38.7%, and the value of phase T resistance is 33.8%, as well as insulation resistance changes when theposition is open phase R1.4%, phase S is 1.2%, and phase T is 1.1%, for the close phase R 1.8%, phase S 1.1%, phase T 1.2%. This matter shows that the performance value in good condition.