The electric field protection is an important part of live working security technology research

which related to the workers’ safety. This article purposefully analyzes the structural characteristics of compact 500 k V same tower double circuit transmission lines

establishes the simulation model of body surface field strength

and calculates the body surface field strength of different operating points under typical conditions. At the same time

it analyzes the influence of the tower type and line operation mode on body surface field strength distribution. The results show that: under the same operating mode

when working at ground potential

the head and foot field strengths of the personnel working in the linear tower are about 4 times higher than those in the strain towers; When working in equipotential

the head field strength on the strain towers is 243.2 k V/m higher than that in the linear towers

and hand field strength is 1.9 times higher than that in the linear towers. When working in the same tower

compared with one circuit operation mode

two circuit operation modes under the same conditions has a stronger influence on the equipotential operation;When working in ground potential

the influence of the operation mode on the body surface field strength on the cross arm is obvious. Through the calculation of shielding efficiency

the safety protection measures under different working conditions and different operation points are checked. The research results can provide theoretical reference for safety protection of live working

and have certain practical value in engineering.