±1100kV直流输电线路带电作业屏蔽防护研究

Research on Shield Protection for Hot-Line Work on ±1100kV DC Transmission Line

±1100kV直流输电线路正在我国施工建设,作为世界上最高的直流输电电压等级,其空间场强要高于±800kV及以下电压等级的输电线路。为开展±1100kV直流输电线路带电作业,需要对带电作业中的屏蔽防护进行研究。首先对±1100kV直流输电线路带电作业人员的屏蔽防护进行了试验研究,试验内容包括屏蔽服基本参数测量、屏蔽服内外电场强度的测量、流经屏蔽服和人体的电流测量、电位转移电流测量和可听噪声测量;其次,分析了±1100kV直流输电线路带电作业屏蔽防护的安全控制水平;最后,根据试验结果归纳了±1100kV带电作业中屏蔽防护的注意事项。研究结果表明,±1100kV直流输电线路带电作业的屏蔽防护是安全可靠的。

As the highest DC transmission voltage level over the world,±1100 kV DC transmission line will be built in China soon.Electric field strength in surrounding space of ±1100 kV DC line is much stronger than that of ±800 kV and lower voltage level line.To ensure safety of hot-line work on ±1100 kV DC lines,its safety protection should be researched.Firstly,based on proposed screening clothes,test results of hot-line work shield protection on ±1100 kV DC line were given,including measurements of characteristics of screening clothes,their inside and outside electrical field strengths,flowing through current of hot-line work screening clothes,discharge arc current and audible noise.Then,safety control level of ±1100 kV DC hot-line work shield protection was analyzed.Finally,based on the test results,precautions for shielding protection in ± 1100 kV hot-line work were summarized.The results show that it is feasible to hot-line work on ±1100 kV DC transmission lines with high quality screening clothes.