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With obvious economic and social benefits, four-parallel lines on the same tower is widely used and has high reliability requirements, the use of live working to carry out maintenance is particularly important. This paper takes 500/220kV four-parallel lines on the same tower as the research object. First, through the analysis of the risk of 500kV and 220kV line typical operation position, it can be...
The multi-circuit transmission lines on the same tower can be considered for solving the contradiction between the growing electricity demand and the limited line corridor. Take the 500kV/220kV four-circuit mixed-voltage transmission lines as an example, the maintenance circuit would have high induced voltage and induced current because of the strong electrostatic coupling and electromagnetic coupling...
Once the UHV transmission lines were put into operation, it is hard to repair at outage. The live working is the forceful guarantee for the security and stability of operation of the UHV transmission lines. The length of the UHV strain insulator string achieves about 12.5 m and the distance between the adjacent strings achieves about 1.0 m. As entering the strong electric field along the UHV strain...
The 500k V double-circuit lines on same tower has some advantages such as small line corridors and large capability, electric field for live-working becomes more complicated because of its compact triple conductors. In this paper, the compact tower is took as the research object, the field strength on body surface at some typical positions during the live working are calculated using finite element...
Most live working projects need lineman enter Equal Potential Working(EPW) for handling, so which method to enter EPW has a significant impact on safety of the lineman. With 220kV cup type tower as objects, the simulation model of the lineman use insulating ladder and hanging basket to enter EPW is established, and filed intensity on body surface is calculated based on finite element method. Simulation...
The large capacity, long distance, high efficiency transmission electric energy can be realized by the UHV DC transmission technology, which can promote energy structure adjustment and optimized layout. Live working is the powerful guarantee for the safe and stable operation of the UHV DC transmission lines. Take the straight-line tower as an example, simulation models of entering the electric field...
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