Optimal analysis of electric field characteristics for live working on straight-line tower of ±1100kV DC transmission line

In order to ensure the safety and reliability of ±1100kV DC transmission line live opera tion and to optimize the body surface electric field of equipotential operators entering and leaving the equipotential, this paper studies the potential transfer p rocess of ±1100kV DC transmission line. Combining with the engineering practice, an isometric model of DC transmission linear tower is established. The body surface field strength, suspension potential and local capacitance of the equipotential operat or entering the pole conductor from different directions are calculated by using electromagnetic s imulation software. The transient response calculation model of potential transfer was established, and the change law of transfer current and arc energy under different angles was analyzed. The simulation analysis results show that the human body surface electric field is the smallest when entering from 45° above the diagonal of the polar conductor, and the maximum field strength is located at the head, which is 279 kV/m. The transfer current decays exponentially with time, and the decay time is about 1 μs, and the maximum transient current is 596 A. The transfer energy is maximum at 45° angle in and out of the polar conductor.