The Analysis of Current Transformer Transient Response and Its Effect on Current Relay Performance

The current transformer transient response will affect the performance of protective relaying. Various factors are examined which will influence current transformer transient response. Formulas are developed for estimating the time to saturation and the time to desaturation of a current transformer during a fully saturated condition. Three current transformer and relaying arrangements are also presented for minimizing the impact of current transformer transient response.