Capacitor voltage transformer consists of many capacitors and inductors

its secondary voltage output can not response immediately to the primary voltage changes.There exist many factors that influence the process of transient response of CVT.This paper lays emphasis on the impact of short circuit voltage phase on the transient process of CVT.Power system block（PSB） in MATLAB Simulink is adopted to establish a simulation model for analyzing electromagnetic transient process.The simulation analysis indicates that different short circuit voltage phase value exerts greatly varied influence on transient process of CVT.A group of transient response curves versus short circuit voltage phase is provided.Electromagnetic transient influence on precision of different relay protection algorithms is analyzed

and solutions to the influence are suggested.