银东线雷电防护线路避雷器开发与应用

Development and Application of Lightning Protection Line Arrester for Yindong Line

为提高±660 k V电压等级直流输电线路的耐雷水平,通过对线路避雷器基本要求和结构型式的研究,从额定电压、直流参考电压、雷电冲击残压、通流容量、压力释放能力、绝缘配合和串联间隙距离等方面对±660 k V直流输电线路避雷器的关键参数进行了设计计算和试验验证,成功研制了±660 k V直流输电线路避雷器,并设计了线路避雷器的支架支撑式安装方式。研究结果表明：线路避雷器的额定电压应为±800 k V,直流参考电压应≥800k V,标称放电电流应为30 k A,雷电冲击残压应≤1 583 k V,波形为1.2/50μs的正极性雷电冲击50%放电电压应≤2 600 k V,串联间隙距离应为（1 900±100）mm,2 ms方波通流容量应为2 k A。研制的±660 k V直流输电线路避雷器已在±660 k V银川—山东直流输电线路（简称银东线）挂网应用,积累了±660 k V直流输电线路避雷器的挂网运行经验,为大规模批量应用提供了依据。

In order to improve the lightning withstand level of ±660 k V DC transmission line,we analyzed basic requirements and structural type of line surge arresters. Moreover,we researched some key technical parameters, such as the nominal voltage, DC reference voltage, residual voltage, long-duration current impulse current, pressure release capability, insulation coordination, series gap distance, and so on, through calculation and corresponding experimental verification. Meanwhile, we developed ±660 k V DC transmission line arresters successfully, and designed a stand support type installation of line arresters. According to the research results, the nominal voltage is 800 k V, the DC reference voltage is no less than ±800 k V, the nominal discharge current is 30 k A, the residual voltage no more than 1 583 k V, the probability of 50% of lightning impulse discharge voltage no more than 2 600 k V, the series gap distance is（1 900±100） mm, and the long-duration current impulse current is 2 k A, respectively. Line arresters for ±660 k V DC transmission line have been used in ±660 k V Yinchuan-Shandong DC transmission line（Yindong line）, which accumulates operating experiences and provides a basis for large-scale application of line arrester on ±660 k V DC transmission lines.