The Induced Electrical Characteristics of Human Body and Metal Clothes Rack at the Steel Frame Platform Near the UHV AC Transmission Line
He Wangling1,2, Tang Rong1, Liu Yunpeng1, Yan Bohu1, Zhang Yinlu1
1. Department of Electrical Engineering North China Electric Power University Baoding 071003 China; 2. Hebei Key Laboratory of Green and Efficient New Electrical Materials and Equipment North China Electric Power University Baoding 071003 China
Abstract：With the increasing number of transmission lines, the line corridors are becoming scarce and the proximity of lines to residential areas is more common. Due to electrostatic induction, the potential on human body and metal structures will be induced. If there are potential differences between them, the transient electric shock will occur when they are in contact. Consequently, the human body will feel electric shock, triggering displeasure or panic, and even triggering line complaints or an engineering boycott. As the operating voltage increases to UHV level, this phenomenon occurs more obviously due to the higher electric field strength. The human body touches metal objects such as metal clothes rack is the common life event. If the living room is near the UHV AC transmission lines, the transient electric shock maybe occurs frequently. Therefore, it is important to study the inductive electrical characteristics of this scenery. In this paper, the transient electric shock research near the UHV transmission line is divided into two types, one is that the human body is well grounded, the metal clothes rack is insulated, and the electric shock is occurred from metal clothes rack to human body; the other is the human body is insulated, the metal clothes rack is well grounded, and the electric shock is occurred from human body to metal clothes rack. Based on above scenarios, an UHV AC transmission line model was established according to the practical UHV transmission lines, the induced voltages of insulated objects were calculated, and the transient electric shock currents of different conditions were obtained by combining the proposed transient shock simulation model. Then a practical test platform was constructed near a 1 000 kV AC transmission line, and the transient electric shock experiments were conducted. The induced voltage and the transient electric shock current were measured and compared with the simulation results. It is found that the computational results of the model are close to those of the experiments. The following conclusions can be drawn from this study: (1) The induced voltage of the human body or the metal clothes rack is related to the position. If the insulated object is higher, the induced voltage level is larger and can result in a serious transient electric shock when contacts. The metal shield can reduce the induced voltage and transient electric shock current effectively. (2) Whether human body is insulated or not has an obvious influence on induced voltage level and transient current level. If the human body is grounded, the body impedance is relatively small, it will cause serious transient electric shock at this situation when the body contact with the insulated metal clothes rack. The amplitude of transient current can reach to 1.548 A. The human perception and annoying level are more obvious than that occurred between the insulated human body and grounded metal clothes rack. (3) Based on simulation and experiments results of this paper, the human perception of transient electric shock is related to the amplitude of induced voltage and current. Therefore, some suggestions are proposed to reduce the electric shock level from above perspective. (4) The proposed simulation model in this paper can calculate the induced voltage and current levels effectively, which provide a reference for induced electrical reduction or elimination.
何旺龄, 汤荣, 刘云鹏, 闫博虎, 张胤禄. 特高压交流输电线路附近钢架平台处人体与晾衣架感应电特性研究[J]. 电工技术学报, 2024, 39(23): 7605-7615.
He Wangling, Tang Rong, Liu Yunpeng, Yan Bohu, Zhang Yinlu. The Induced Electrical Characteristics of Human Body and Metal Clothes Rack at the Steel Frame Platform Near the UHV AC Transmission Line. Transactions of China Electrotechnical Society, 2024, 39(23): 7605-7615.
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