750 kV输电线路带电作业安全防护研究

为填补750kV线路带电作业安全防护研究的空白,根据750kV线路电压等级高、空间场强大的特点,研制了相应的带电作业屏蔽服,按照标准测试了屏蔽服的衣料和成品性能,并针对线路实况测量了等电位时人体不同部位屏蔽服内外电场强度及流经人体的电流,还进行了操作冲击电压下的生物放电试验。结果表明,研制的屏蔽服完全满足750kV线路带电作业安全防护要求。750kV线路带电作业人员应穿戴全套屏蔽服,保持足够的安全距离,并采取措施防护感应电压的影响。

Research of Safety Protection for Live Working on 750 kV Transmission Lines

Because of the high voltage and strong space electrical field intensity of the 750 kV transmission lines, it is very important and necessary to do research on the safety protection for live working on 750 kV transmission lines. In this paper, according to the practical conditions of the lines, suitable full set screen clothes are developed, and then characteristics of material that the screen clothes made of and the ready-to-wear are tested following corresponding national standards of GB 6568.1-2000 and GB 6568.2-2000. Based on the lines' conditions, measuring of the electrical field intensity in and outside of screen clothes at different parts of body and the current through body while the body potential is equal to the potential of the live line are taken. Besides these, the tests of creature responses when current caused by discharge under switching impulse voltage go through it are done. The tests results indicate that the developed screen clothes has good performances on electrical field screening, current splitting and voltage sharing, thus meet the requirements for the safety protection of human body while live working on 750 kV transmission lines. Based on the research work, conclusions can be drawn that to ensure the safety of live working, persons doing live working should wear full set screen clothes, keep enough safe clearance, and take correct and adequate measures to protect themselves from inducting voltage.