Harmonic Measurement Characteristics of Capacitor Voltage Transformer (CVT) of 110 kV

doi:10.11930/j.issn.1004-9649.2014.8.57.4

Abstract

Abstract: Considering the harmonic distortion from the primary circuit to the secondary circuit of capacitor voltage transformers (CVT), the harmonic measurement characteristics of CVT are analyzed with testing and the simulations. By taking a certain type of 110 kV CVT for case study, a high frequency equivalent circuit of CVT is constructed, which takes consideration of stray capacitance, coupling capacitor, dielectric loss of capacitive divider and equivalent resistance of compensation reactor. By using Matlab, the CVT’s harmonic model is built and its amplitude-frequency characteristic curves are obtained. To prove the correctness of the simulation model, harmonic measurement tests are carried out for CVT in the field, and the testing results are compared with the simulation results. It is concluded that the voltage harmonic content and the amplitude of the fundamental voltage have no impacts on the measurement characteristics of CVT.

Key words: capacitor voltage transformer, harmonic measurement, Matlab

CLC Number:

TM614

LI Lin, DUAN Xiao-bo, LIU Guan-qi, ZHOU Wen. Harmonic Measurement Characteristics of Capacitor Voltage Transformer (CVT) of 110 kV[J]. Electric Power, 2014, 47(8): 57-61.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2014.8.57.4

https://www.electricpower.com.cn/EN/Y2014/V47/I8/57

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