Initial Characteristics of Generator Stator Insulations

발전기 고정자 권선 절연재료의 초기특성

This paper describes the initial characteristics of turbine generators at the Taean thermal power plant #4 and Wolsong nuclear power plant #2. The turbine generators had been in service for two years. The insulation diagnostic tests included measurements of insulation resistance, polarization index, ac current, dissipation factor($tan{\delta}$) and partial discharges (PD). The values of ac current and tan a were measured by Schering bridge. PD measurements were conducted using digital PD detector. The variation of $tan{\delta}$ and PD was confirmed in two generator stator insulations.