The Journal of Engineering (Apr 2019)
Simulation calculation of electric field protection for live working on Ultra-high voltage transmission line
Abstract
The current standards related to live working provide no determined path for equal potential working, in which only safety distance is referred, so that the works are often executed relying on the line maintenance experience. As high-voltage and strong space electrical field intensity exist in 1000 kV ultra-high voltage transmission lines, the real-time safe distance measurement is difficult to be conducted and the exhaustive full-scale experiments are difficult to accomplish due to the varied true tower models and lines. Simulation calculation is aroused for improving the efficiency of safety distance calculation and safety path planning during the process of importing and exporting the potential according to the different kind of tower and the actual line situation. Here, with the cup type iron tower and hanging basket mode, the electrical field intensity in and outside of screening clothes at different part of body while climbing tower and during equal-potential process are calculated, and then the safety distance, the combination gap, and the optimal path planning are carried out. The simulation results demonstrate that electrical field intensity meet safety requirements using the proposed planning path, which enriches the theoretical basis for the safety operation of ultra-high voltage live working.
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