To ensure the safety of both lines and working staff when live working on ±800 kV ultra-high voltage DC（UHVDC）transmission lines.The tower model

insulator model

transmission line model and human body model are establishedby Ansoft software.The finite element method is used to calculate and analyze theelectric field intensity on different parts of the human body.The results show that when two people upright into electric field along the insulator

thesurface field of human body

when moves to the 1/4 insulator

is about 5

1

5 kV/m.The surface field of human body

when movestothe 1/2 insulator

is about 10

3

0 kV/m.Hanging basket method is

used to human body into electric field

human body at the tower cross

are safety.When the hanging basket moves to about 3m away from the shielding ring

the body surface strength is about 41

1

95 kV/m

and when the operator reaches the equipotential

the surface strength of the operator exceeds 510 kV/m

and special shielding measures should be taken.