摘要
复合绝缘子酥朽断裂和内击穿属于两类严重影响电力系统稳定运行的恶性事故。在对多起酥朽断裂和内击穿事故案例分析过程中,发现二者的故障形貌表现出诸多相似性,进而推测二者存在某种内在关联性。通过对比分析复合绝缘子酥朽断裂和内击穿事故的故障特征、故障机理及发展过程,本文指出,复合绝缘子酥朽断裂和内击穿事故具有相同的故障本质,即由芯棒与护套界面缺陷诱发的芯棒酥朽老化现象。酥朽老化发展过程同时损害绝缘子的电气性能与机械性能,而最终发展为电气事故(内击穿)或机械事故(酥朽断裂)取决于绝缘子最小干弧距离与芯棒直径之比。实际案例统计数据表明,内击穿多发于110 kV、220 kV线路复合绝缘子,而酥朽断裂目前仅见于500 kV复合绝缘子,这一规律与本研究理论推导结论相符,验证了本研究所提理论的合理性。
The decay-like fracture and internal breakdown of composite insulators are two types of malignant accidents that seriously affect the operation stability of the power system. In the course of analyzing a couple of cases of decay-like fracture and internal breakdown accidents, the author noticed that there were quite a lot of similarities between their fault morphologies, and made a speculation that there were some internal correlations between the two types of accidents. By comparative analyzing the fault characteristics, fault mechanism and development process of the accidents of the composite insulators, the author points out that the decay-like fracture and internal breakdown accidents share the same fault essence, that is, the decay-like aging induced by the defect on the interface of the sheath and the core rod. The development of decay-like aging damages both the electrical and mechanical properties of the insulator simultaneously, and whether it ends up with an electrical accident(i.e. internal breakdown) or a mechanical accident(i.e. decay-like fracture) depends on the ratio of the minimal dry-arc distance to the diameter of the core rod. The actual case statistics show that internal breakdown occurs more frequently on composite insulators of 110 kV and 220 kV, while decay-like fractures are currently only seen in composite insulators of 500 kV. This rule is consistent with conclusions derived from theories of this paper, which verifies the rationality of the theories proposed in this paper.
作者
卢明
伍川
盛从兵
江渺
高超
李黎
LU Ming;WU Chuan;SHENG Congbing;JIANG Miao;GAO Chao;LI Li(State Grid Henan Electric Power Research Institute,Zhengzhou 450052,China;Puyang Power Supply Bureau,HenanElectric Power Corporation,Puyang 457000,China;School of Electrical and Electronic Engineering,Huazhong University of Science&Technology,Wuhan 430074,China)
出处
《电瓷避雷器》
CAS
北大核心
2022年第1期157-164,共8页
Insulators and Surge Arresters
基金
中原科技创新领军人才资助项目(编号:194200510024)。
关键词
复合绝缘子
酥朽断裂
内击穿
界面缺陷
酥朽老化
composite insulator
decay-like fracture
internal breakdown
interface defect
decay-like aging
