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电极表面粗糙度对SF_6气体绝缘性能的影响国际上曾做过不少工作,丹麦Pedersen教授由理论计算得到的曲线——击穿门槛(E_0/P)_(max)——PR_(max)变化曲线(P为气压,R_(max)反映粗糙度)具有重要影响。作者进行的试验表明,由机加工形成的表面粗糙度,在相当宽的范围内(R_(max)=10—50μm)对击穿门槛(E_0/P)_(max)的影响远小于气体压力P的影响。这与上述理论曲线的结论不一致。试验还表明气压较高,电极表面极光滑,并不能达到该曲线所予示的极限值[(E_0/P)_(max)=89kV/cm·bar].相反,气体压力较低时,即使电极表面较粗糙却能达到或接近这一极限值。分析其他学者的论著进一步证实了上述结论。本文首次明确指出Pedersen理论曲线的这些缺陷并分析了其原因。所得结论可供工程实践参考。
The influence of electrode surface roughness on SF6 gas insulation has done a lot of work in the world. The curve calculated by Professor Pedersen in Denmark - the breakdown threshold (E_0 / P) _ (max) - PR_ (max) Curves (P for air pressure, R max for roughness) have a significant effect. Experiments conducted by the authors show that the surface roughness formed by machining has a much smaller effect on the breakdown threshold (E_0 / P) _ (max) over a wide range of pressures (Rmax (10-50 [mu] m) The impact of P This is inconsistent with the conclusion of the above theoretical curve. The test also showed that the higher gas pressure and the extremely smooth electrode surface did not reach the limit shown by the curve [(E_0 / P) _ (max) = 89 kV / cm · bar]. Conversely, Coarse electrode surface can reach or approach this limit. The analysis of the works of other scholars further confirms the above conclusion. This article for the first time explicitly points out these shortcomings of the Pedersen theoretical curve and analyzes its causes. The conclusions obtained for engineering practice reference.