Live working is the most direct and effective means for the maintenance of the multiple circuit transmission lines on the same tower

so it is necessary to analyze the feasibility of live working on the four circuit transmission lines on the same tower. In this paper

the 110 kV

220/110 kV and 500/220 kV four circuit transmission lines on the same tower is taken as the research object

and the safety of live line work is evaluated from the risk of live working on typical position and the

field strength of worker. The calculation results show that the risk rate of live working on the wire of 110 kV

220/110 kV four circuit transmission lines on the same straight-line tower is more than 1×10

-5

and the risk rate of live working on the cross arm of 110 kV four circuit transmission lines on the same strain tower is more than 1×10

-5

which do not meet the requirements of regulation. And the risk rate of live working on the wire of 500/220 kV four circuit transmission lines on the same tower is less than 1×10-5

which meets the requirements of regulation. When workers do not wear shielding clothes and live working on the four circuit transmission lines on the same tower

the largest field strength of the human body are in the position of the feet

respectively

10.803

1 482.2 and 2 138 kV/m

what’s more

at least 37.15

39.90 and 42.67 d B shielding clothing can ensure the safety of the workers. In conclusion

when workers in right conductive clothes and can safely live working on the wire of 500/220 kV four circuit transmission lines on the same tower

but there are safety risks involved to which live line work on the wire of 110 kV

220/110 kV four circuit transmission lines on the same straight-line tower and 110 kV four circuit transmission lines on the same strain tower.