Research of Influence of Garton Effect on the Measurement Values of Dielectric Loss of Capacitor Voltage Transformer

The influence of Garton effect on the measurement values of dielectric loss of capacitor voltage transformer (CVT) is lack of systematic research and understanding. The Garton effect in insulation theory was expounded. Using a CVT with Garton effect, the values of dielectric loss were measured before and after the lightning impulse test and the short-time running voltage test respectively. Through the analysis of the values, the law of the influence of Garton effect on the measurement values of dielectric loss of CVT is mastered. And the methods and treatment recommendations were put forward to judge if Garton effect occurs in field tests of CVT, which provides a reference for the accurate discrimination of CVT insulation condition.