熔断型直流避雷器熔断退出特性试验研究

Experimental Research on the Fusing Characteristics of Fused DC Arrester

直流系统避雷器组伏安特性的差异会使电流分配不均,多台避雷器并联情况下均流系数对整体吸能影响很大,性能劣化的避雷器吸收更多的能量,且使得整支避雷器总吸能严重下降。提出了熔断型直流避雷器组的解决方案,在单柱避雷器上串联一个熔断器,避雷器被击穿后熔断器熔断退出,将故障柱避雷器隔离,使其它柱避雷器正常运行,实现对直流避雷器组的保护,防止直流系统因故障闭锁。搭建了大容量试验平台,对熔断型直流单柱避雷器熔断退出特性进行了试验研究。试验结果表明,熔断型直流避雷器中单柱避雷器能够有效退出,能够有效的解决避雷器被击穿带来的安全问题,保证整个避雷器组的正常运行。

The V-A characteristics’ difference of arrester group in DC system will make the current distribution uneven. Current sharing coefficient has a great influence on the overall energy absorption of multiple arresters in parallel. Arresters with deteriorated performance absorb more energy and make the total energy absorption of the whole arrester group seriously decrease. The solution of fuse type DC arrester group is put forward. A fuse is connected in series on the single column arrester. After An arrester is broken down, the fuse will fuse out to isolate the fault column arrester, so that other column arresters can operate normally, then the protection of DC arrester group is realized, and the DC system can be prevented from locking due to fault. A large capacity test platform is built to study the fusing characteristics of the fused DC arrester unit column. The results show that the fused DC arrester unit can exit effectively, and the safety problems caused by the breakdown of the arrester can be solved effectively to ensure the normal operation of the whole arrester group.