ELUCIDATION OF CREEPING STREAMER PROPAGATION MECHANISMS IN SOLID-LIQUID INTERFACE

研究了空气/固体和液体/固体界面中的蠕变放电现象及其传播机理，并在空气/固体绝缘系统中，研究了雷电冲击电压条件下架空绝缘导线表面的蠕变放电。明确了在导线表面干燥和潮湿条件下，极性对蠕变放电形状和长度的影响。值得注意的是，在导线干燥的情况下，负蠕动流光的长度随着电压的变化分为两个区域(增加和减少)。这一现象可以通过放电形态由附着型向跳跃型的转变来解释。在液体/固体绝缘体系中，首先，沿BLA…对称面插入聚乙烯绝缘子的影响进一步研究了非平面电极几何形状对直流应力下变压器油中导电特性的影响。研究发现，绝缘子的存在大大降低了导通电流。在考虑绝缘子表面荷电的基础上，从电液动力(EHD)运动和叶片边缘电场的角度对这一现象进行了讨论。其次，研究了变压器油中固体绝缘子表面在雷电冲击电压作用下的蠕变放电行为。研究发现，周围接地金属电极的存在对蠕变放电有很大影响。第三，研究了不同压力条件下液氮中聚乙烯绝缘子表面的脉冲爬电放电现象。阐明了排出长度与液体汽化的关系。阐明了绝缘子表面荷电对放电传播的影响。较少

The creepage discharge phenomena and discharge propagation mechanisms in a air/solid and a liquid/solid interfaces were investigated.In a air/solid insulation system, the creepage discharges traveling over the surface of aerial insulated wire were investigated under a lightning impulse voltage condition. The polarity effect both on the shapes and the lengths of the creepage discharge was clarified under dry and wet conditions of the wire surface. It was worthy of notice that the lengths of a negative creeping streamer in the dry condition of wire were separated into two regions (increase and decrease) as a function of the voltage. This phenomenon was explained by the transition of the discharge aspects from clinging type to jumping type. It was also found that the streamer propagation was significantly affected by the electric field strength of wire surface.In a lipuid/solid insulation system, firstly, the effect of a polyethylene insulator inserted along the plane of symmetry of a bla … More de-plane electrode geometry on the conduction characteristics in transformer oil under D.C.stresses was investigated. It was found that conduction currents were exceedingly decreased by the presence of the insulator. This phenomenon was discussed on the basis of the electrohydrodynamic (EHD) motion as well as the electric field of the blade edge taking into account the insulator surface charging. Secondly, the behavior of the creepage discharges on the solid insulator surface in transformer oil was investigated under a lightning impulse voltage application. It was found that the creepage discharges were significantly affected by the presence of a surrounding grounded metal electrode. Thirdly, the impulse creepage discharge phenomena on the polyethylene insulator surface in liquid nitrogen were investigated under the various pressure conditions. The relationship between the discharge length and the vaporization of the lipuid was clarified. The effect of insulator surface charging on the discharge propagation was also clarified. Less