High-frequency Equivalent Circuit Modeling for Overvoltage Detection

摘要

A high-frequency equivalent circuit modeling method is proposed, which can model the overvoltage sensor called Current Transformers (CTs). The proposed method uses the formula, which is based on the electromagnetic resonance, to get the high-frequency equivalent circuit. Then the magnitude of overvoltage can be reconstructed according to the last-screen current and high-frequency equivalent circuit. It is important to rebuild overvoltage, which can effectively assess the insulation risk and ensure the safe operation of the power grid. In this paper, the correctness of the proposed high-frequency equivalent circuit is verified by a simulation model, the conclusion is given by numerical results. while the measurement results show that by fitting the parameters of the equivalent circuit, the admittance of the Current Transformers can be obtained.