Current densities and total contact currents for 110 and 220 kV power line tasks

摘要

The aim of this study was to analyze all values of electric current from measured periods while performing tasks on 110 and 220 kV power lines. Additionally, the objective was to study the average current densities and average total contact currents caused by electric fields in 110 and 220 kV power line tasks. One worker simulated the following tasks: (A) tested insulation voltage at a 110 kV portal tower, (B) checked the wooden towers for rot at a 110 kV portal tower, (C) tested insulation voltage at a 220 kV portal tower, and (D) checked the wooden towers for rot at a 220 kV portal tower. The highest average current density in the neck was 2.0 mA/m2 (calculated internal electric field was 19.0-38.0 mV/m), and the highest average contact current was 234μA. All measured values at 110 and 220 kV towers were lower than the basic restrictions (0.1 and 0.8 V/ m) of the International Commission on Non-ionizing Radiation Protection.