CAJ | 학술논문

复合绝缘子的芯棒和护套间的胶接界面贯通于绝缘子两端,是内绝缘的组成部分。一旦芯棒和护套粘接不紧密,在界面形成的间隙将畸变周围电场分布,高场强的长期作用将对芯棒机械性能造成影响。为了研究界面缺陷对电场分布的影响,以南方电网某交流500kV线路复合绝缘子断裂事故为研究对象,应用有限元分析软件ANSYS建立了该断裂复合绝缘子的整体模型和子模型,计算了芯棒表面存在缺陷时的电场分布。结果表明：气隙处电场强度增大,但不足以引发局部放电。水分渗入后,缺陷尺寸足够大时电场强度将会超过空气的击穿场强,导致局部放电,进一步加速界面粘接性的劣化;护套破损后内部芯棒暴露,芯棒蚀损使得机械性能降低,最终将引发断裂掉串。
복합절연자적심봉화호투간적효접계면관통우절연자량단,시내절연적조성부분。일단심봉화호투점접불긴밀,재계면형성적간극장기변주위전장분포,고장강적장기작용장대심봉궤계성능조성영향。위료연구계면결함대전장분포적영향,이남방전망모교류500kV선로복합절연자단렬사고위연구대상,응용유한원분석연건ANSYS건립료해단렬복합절연자적정체모형화자모형,계산료심봉표면존재결함시적전장분포。결과표명：기극처전장강도증대,단불족이인발국부방전。수분삼입후,결함척촌족구대시전장강도장회초과공기적격천장강,도치국부방전,진일보가속계면점접성적열화;호투파손후내부심봉폭로,심봉식손사득궤계성능강저,최종장인발단렬도천。
The bonding interface between the rod and the sheath of composite insulators,which through both ends of the insulator is an integral part of the inner insulation.If the bonding of the composite insulators＇ rod and sheath is not closely,the air gap between the rod and sheath will affect the electric field,and the mechanical properties of the rod will be reduced in the high intensity electric fields for a long time.On the basis of a rupture accidents of a 500 kV AC composite insulator,in order to calculate the distribution of electric field,we established a overall model and a sub-model by using the ANSYS code,and analyzed the influence of air gap.The simulation results show that the electric field around the air gap increases remarkably but is not high enough to cause partial discharge.Water can infiltrate into the gap,and strength of the electric field around the gap is higher than that of the air breakdown field,causing partial discharge and reducing the adhesion of the interface.When mandrel is exposed after the shealth being damaged,erosion can influence its mechanical properties,and finally cause breakage.