Study on The Difference of Bodily Surface Field Intensity for Live Working Operators of UHVDC Transmission Line Considering Meteorological Factors

Abstract

During live working on UHVDC lines, If the field intensity of a certain part exceeds some certain threshold, it will cause discomfort and even pose a threat to personal safety. As UHVDC transmission has a long span, the climatic environment of regions through which the UHVDC line passes is complex and changeable, the effect degree of meteorological factors varies greatly with different bodily parts. In order to explore the difference in the field intensity of different locations of operators with the changes in meteorological conditions, firstly, a simulation model is built on the basis of the actual situations of the UHVDC line, and its correctness is verified by comparing it with the measured data; secondly, a large-scale simulation of the bodily surface field intensity of live working operators under different atmospheric parameters is carried out, and the influence weight for each meteorological factor is distributed by the combination weighting; thirdly, the correlation between the bodily surface field intensity and meteorological factors is analyzed through the use of the grey relational analysis (GRA) to construct the evaluation matrix; finally, the intensity of the personnel electric field difference of each part of the live working operator is evaluated by combining the grey relational analysis with technique for order preference by similarity to ideal solution (TOPSIS). The result turns out that the field intensity of the feet and head is more susceptible to meteorological factors. Because the head is highly sensitive to field intensity and its protective barrier is relatively weak, it is necessary to focus on strengthening the field intensity monitoring and safety prevention and control of the operator's head. The research can provide a reference for constructing a complete safety protection system for live working operators.