利用非线性动力学研究覆冰绝缘子表面泄漏脉冲电流

Research on Surface Leakage Impulse Current of Iced-insulator Using Nonlinear Dynamics

笔者通过研究常温下,覆冰绝缘子各融冰阶段不同交流电压等级下表面临闪泄漏脉冲电流时域波形的变化规律,利用非线性动力学理论分析了各阶段泄漏脉冲波形的非线性特性,通过比较波形的最大幅值变化和Lyapunov指数(LE),得出了融冰过程绝缘子表面泄漏脉冲的变化特性,结果表明,不同融冰阶段及其不同电压等级下的泄漏放电脉冲波形具有不同的非线性特性,因此可为覆冰绝缘子的故障监测提供新的诊断方法。

Through making AC tests under ambient temperature,this paper studies the time-domain variation rule of facing flashed leakage impulse current on the surface of iced insulators under different voltage levels at different ice-melting stages.The nonlinear properties of leakage pulse current at various stages are analyzed by using nonlinear dynamics theoretics,meanwhile,by comparing the wave amplitude changes and the largest Lyapunov Index（LE）,the change characteristics of the insulator surface＇s lakeage pulse current for various ice-melting processes are deduced,and the results show that they take on dissimilar nonlinear properties for the lakeage discharge pulse waveform under different voltage level at different ice-melting stages,therefore,throught which a new diagnostic method to monitor the faults for iced insulators is proposed.