To reach more accurate judgement of live working security distance on transmission line

we put forward a method of the field strength vector location.First

we established a calculation model of the electric field around the transmission line.Next

according to the maximum field strength of vector direction and vectors composition at the field measurement dot

and the practical measuring error factors

we searched for the set of possible field strength approach point coordinates.Then

these possible approach points are divided into different point groups according to mathematical clustering method.With the continuous movement feature of the field measurement dot

the center of true approach dot group is determined in order to realize precise tracking and location.Finally

through simulation analysis of two dimensional field strength instance about 220 k V transmission lines.It is showed that the distance error of 82.7% field measurement dots is less than or equal to 0.1 m

and only 2.75% greater than or equal to 0.5 m.Basically

the error is further reduced to less than 0.1 m

according to the continuous movement feature of the field measurement dot.In the practical test

95% test distance error is less than or equal to 0.56 m

and 5% less than or equal to 1.0 m

basically meeting the requirements of the transmission line for safe distance.The simulation and practical test result shows its effectiveness

and the future research direction is pointed out.