聚丙烯材料应用于低气压放电腔体可行性研究

Feasibility of Constructing Low Pressure Large-Gap Discharge Chamber with Polypropylene Material

为研究长间隙放电,制作了工作压力在100 Pa^0.1 MPa范围内可调的实验腔体。从电气要求、材料性能和经济成本方面考虑,选择聚丙烯为制作腔体的主要材料,并从安全性能和气密性能两个方面对其可行性进行了验证。同时结合仿真软件分别对直径为1200和150 mm的两个聚丙烯法兰盘及其上金属螺栓的电场强度以及悬浮电位缺陷在直流电压作用下的局部放电特性进行研究,结果表明:当腔体高压电极所加电压为100 kV时,腔体表面的最大场强为9.83 kV/cm,金属螺栓的最大场强和悬浮电位分别为:1.6 kV/cm和0.03 V,可以认为金属螺栓的悬浮电位不会使得螺栓尖端产生电晕放电,从而不会对放电过程中的信号检测产生干扰。该研究为今后使用绝缘材料用于制作低气压容器以进行放电研究提供了参考。

Here,we addressed the feasibility of constructing low pressure（ 100 Pa ～ 0. 1 MPa） chamber with polypropylene（ PP） material,dedicated to study of high voltage large-gap discharge. The technical issues,including the mechanical strength,field distributions of PP flanges（ 1200 and 150 mm in diameter） and metal bolts,safety and leakage rate,were tentatively discussed. Besides,the field distributions in the chamber and the localized discharge,possibly originated from the high DC voltage and / or defect-induced floating potential,were mathematically modeled,theoretically analyzed and numerically simulated. The simulated results show that at a discharge voltage of 100 kV,the highest field on the PP surface is 9. 83 kV / cm; and no corona discharge interference may occur at a floating potential of 0. 03 V at most,though the strongest field possible of the metal bolts could be 1. 6 kV. We suggest that polypropylene material be feasible to construct highly insulating low pressure chambers with high corrosion resistance.