表面生长苔藓对500kV交流输电线路玻璃绝缘子的影响

发布时间：2018-10-21 19:31

【摘要】：为研究表面生长苔藓的玻璃绝缘子的电气特性和机械特性,以21片500 kV表面生长苔藓的玻璃绝缘子作为试品进行了研究。测量了21片试品的污秽度和绝缘电阻,并进行污闪试验和拉力试验。在此基础上,对苔藓易生长的位置、生长原因和处理方法进行了讨论。结果表明,当玻璃绝缘子耐张串悬挂时,苔藓在绝缘子上表面的分布远不如在下表面的分布密集,且其在下表面主要分布于上侧棱外沿和下侧棱内沿。表面生长苔藓的玻璃绝缘子的单片污闪电压为42.5 kV,其电气特性和机械特性仍然满足线路运行要求。然而,由于玻璃绝缘子生长苔藓部位的盐密(ESDD)和灰密(NSDD)明显大于未生长苔藓部位,随着时间的推移,苔藓部位的盐密和灰密进一步增大,会对绝缘子的安全运行造成隐患,因此需要重点关注并定期进行清扫。
[Abstract]:In order to study the electrical and mechanical properties of glass insulators for moss growing on the surface, 21 glass insulators grown on the surface of 500 kV moss were used as samples. The contamination degree and insulation resistance of 21 samples were measured, and the contamination flashover test and tensile test were carried out. On this basis, the location, growth cause and treatment of bryophytes are discussed. The results show that the distribution of moss on the upper surface of the insulator is much less dense than that on the lower surface when the glass insulator is suspended, and it is mainly distributed along the outer edge of the upper edge and the inner edge of the lower edge. The monolithic flashover voltage of moss glass insulator is 42. 5 kV, and its electrical and mechanical characteristics still meet the requirements of line operation. However, the salt density (ESDD) and gray density (NSDD) of moss growing on glass insulator are obviously larger than that of non-growing moss. With time, the salt density and ash density of moss increase further, which will cause hidden danger to the safe operation of insulator. Therefore need to focus on and regular cleaning.
【作者单位】：清华大学电机工程与应用电子技术系电力系统及发电设备控制和仿真国家重点试验室;南方电网科学研究院有限责任公司;
【基金】：国家重点基础研究发展计划(973计划)(2011CB209406) 特高压工程技术(昆明、广州)国家工程试验室开放基金(NEL201202)~~
【分类号】：TM216

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