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针对动车组受电弓环氧树脂车顶绝缘子放电产生电痕,致使绝缘性能下降的问题,基于ANSYS建立了车顶绝缘子沿面放电的非线性电热耦合瞬态模型。仿真结果表明:以温升来表征电痕程度,对局部电痕,耐电痕能力从低到高依次为护套表面、伞裙上表面、伞裙下表面;闪络时,伞裙边沿温度最高,耐电痕能力最低,伞裙根部温度最低,耐电痕能力最高;产生电痕的时间不同,其中伞裙上表面0.14 s,护套表面0.20 s,伞裙下表面0.55 s;电痕程度随时间而呈非线性变化,电蚀深度随时间而线性增加,电蚀宽度与时间的关系可用双指数函数来表征,趋势为先快后慢,最后趋于不变。研究结果揭示了受电弓环氧树脂车顶绝缘子不同部位的耐电痕能力与电痕侵蚀的规律,可为保障高速动车组的安全运行提供理论支持。
In order to solve the problem that the EMU discharges from the pantograph epoxy resin roof insulator and leads to the drop of the insulation performance, a nonlinear electrothermal coupled transient model of the creeping discharge of the roof insulator is established based on ANSYS. The simulation results show that: the temperature rise to characterize the extent of the degree of tracking, local tracking, traceability from low to high order jacket surface, the upper surface of the umbrella skirt, umbrella skirt under the surface; flashover, umbrella skirt edge temperature The highest trace resistance, the lowest temperature at the base of apron and the highest tracking resistance; the time of tracing was different, the upper surface of the skirt was 0.14 s, the surface of the sheath was 0.20 s and the lower surface of the skirt was 0.55 s; The degree changes nonlinearly with time, and the depth of erosion increases linearly with time. The relationship between the width of erosion and time can be characterized by double exponential function. The trend is that the trend is fast, slow and finally unchanged. The results of the study reveal the resistance to tracking and erosion of different parts of the pantograph epoxy resin roof insulator, which can provide theoretical support for the safe operation of the high-speed EMU.