Effect of load power factor on current-transformer performance

The current transformer, for metering as well as protection, may not, in practice, have a purely resistive load. In certain special applications, the load is inductive, e.g. oscillograph coils etc., and, when the control cables are very short, it is possible that the load may have a power factor of less than unity. The steady-state and transient fluxes under these conditions are analysed. The effect of the load power factor of the current transformer on the errors is presented. The equations developed in the paper are directly helpful in forecasting the performance of a current transformer when connected to a nonresistive load.