±500kV直流输电线路用复合外套带串联间隙金属氧化物避雷器的研制

Development of Polymeric MOA with No-supporting Series Gap for ±500 kV DC Transmission Lines

为了提高±500kV直流输电线路的耐雷水平,降低其雷击闪络率,研制开发了±500kV直流线路用复合外套带串联间隙金属氧化物避雷器。通过对该避雷器动作负载和保护原理的研究,提出了其结构性能要求,并设计计算了该避雷器的主要技术参数。研制出了额定电压571kV、8/20μs标称放电电流20kA下残压为1 064kV,正极性雷电冲击50%放电电压为1 830kV的±500kV直流线路避雷器。型式试验结果表明,所研制的±500kV直流线路避雷器电气、机械特性等均达到设计要求,能够有效保护±500kV直流绝缘子串免遭雷击闪络。±500kV直流线路避雷器的成功研制填补了直流输电线路避雷器的技术空白,为该避雷器在±500kV直流输电线路上的推广应用打下了基础。

In order to improve the lightning withstand level of ±500 kV DC transmission lines and to reduce the lightning flashover rate,polymeric MOA with no-supporting series gap for ±500 kV DC transmission lines was developed and manufactured.By analyzing the operation duty and protection principle of the target line surge arrester,its structure requirements were presented and its main technical parameters were calculated and designed.The polymeric MOA with no-supporting series gap for ±500 kV DC transmission lines has been developed successfully by the State Grid Electric Power Research Institute,of which the nominal voltage,the residual voltage and the positive 50% lightning impulse discharge voltage are 571 kV,1 064 kV and 1 830 kV,respectively.By means of the pattern tests,it is proved that the mechanical and electrical properties of the line surge arrester are reasonable and the parameters design could be achieved successfully,which assures the line surge arrester could provide satisfactory protection for the insulator strings.The successful development of the product field in the domestic blank among line arresters for DC transmission lines,and lays a foundation for the usage spreading of the device on ±500 kV DC transmission lines.