Based on the engineering background of power system voltage level continuous increasing

using the method that test current transformer V-A characteristics by frequency conversion

that offers the possibility for the current transformer’s site inspection.By studying the power loss during the core magnetization process

then obtains there is the internal relation between excitation frequency and power loss.Give solution to compensate loss during frequency conversion of V-A characteristic

that is

frequency ratio convert as the premise

then compensate the loss of correction.The research results show that

the improved solution of frequency conversion test is more similar to V-A characteristic under test of power.