CVT高压侧保险非期望熔断的原因分析

Analysis of Unexpected Fusing in High Voltage Side Fuse for CVT

电容式电压互感N（CVT）虽然解决了互感器和导线对地电容之间谐振的问题，但其高压侧保险丝在实际运行中仍经常非期望熔断；本文从电容式电压互感器（CVT）内部结构出发，充分考虑各种非线性器件的饱和特性，构建了CVT的暂态模型；通过稳态和暂态频谱分析，理论上确定了可能引起，CVT高压侧保险丝熔断的原因；并根据暂态模型建立了CVT完整的饱和MATLAB仿真模型，通过仿真验证了理论分析的正确性，为解决CVT高压侧保险丝非正常熔断现象提供了理论依据。

Although the Capacitor Voltage Transformer （CVT） has solved the resonant problem between the PT and the wire-to-ground capacitance. The fuse of high-voltage side still unexpectedly fuses sometimes. This article has constructed CVT＇s transient model from its internal structure and nonlinearity. And the analysis shows how lead to the fuse of high voltage side has been fused. By its transient model, we also constructed its MATLAB simulation model. The correctness of previous theoretical has been proved by the simulation results. This article has provided theoretical basis for how to solve the problems.