Ⅳ级污秽1000kV瓷外套金属氧化物避雷器的抗震研究

Study on Seismic Performance of Porcelain Housed Metal Oxide Surge Arrester for 1000 kV A.C. System in IV pollution Area

目前国内1000 kV交流系统用瓷外套避雷器一直使用在Ⅲ级污秽地区,但随着1 000 kV交流输电系统在国内的广泛应用,出现了将火力发电厂直接与1 000 kV交流输电系统对接进行特高压输电的情况,这就直接提出了Ⅳ级污秽结构避雷器的开发与应用需求。相较于耐Ⅲ级污秽的结构,耐Ⅳ级污秽的避雷器高度、重量均有较大幅度的增加,因此抗震性能的要求将变得更加苛刻。本文结合工程需要,通过介绍Ⅳ级污秽1 000 kV交流系统用瓷外套避雷器开发过程中的抗震设计、抗震解析以及抗震试验验证过程,论证了其抗震的安全性。

At present the porcelain housed arrester for 1 000 kV AC system has been used in grade Ⅲ pollution area, but with the widely application of 1 000 kV UHV AC transmission system in domestic, the condition that the thermal power plant direct docking with the 1 000 kV UHV AC transmission system for UHV transmission is appeared, which raised the demand for the development and application of grade IV pollution structure arrester. Compared to the grade III pollution structure, the height and weight of grade IV pollution attester are greatly increased, so the requirements of seismic performance will become more demanding. According to the needs of the project, through the introduction of seismic design, seismic analysis and seismic test validation process in the development process of the grade IV pollution porcelain housed surge arrester for 1 000 kV AC system use, the seismic safety is demonstrated.