Multi-criteria fusion verification method of CVT harmonic measurement error in operation

Abstract

With the continued deepening of power quality monitoring and management, the harmonic measurement error caused by the capacitor voltage transformer (CVT), which is widely used in the high-voltage power grid, can not be avoided. Firstly, the root cause of CVT harmonic measurement error is studied by the harmonic equivalent model, and constructs a high-voltage intelligent test platform covering multi-voltage level CVT harmonic measurement error, and carries out a number of in-depth measurement tests to compare and analyze the difference of different CVT harmonic measurement errors. Secondly, based on the test results, a multi-criteria fusion method is proposed to verify the CVT harmonic measurement error in substation field operation. Finally, the monitoring scheme of a 220kV substation is designed accordingly. The analysis results show that the method can effectively judge the CVT harmonic measurement error.