Abstract
The use of uni-body composite cross-arm in a fully composite-based pylon is a new concept for the next generation of overhead transmission lines. The crossarm is stressed by phase-to-phase voltages except in two regions, which are stressed by phase-to-ground voltages caused by installation of shield wires. Due to a major difference between the novel cross-arm structure and traditional composite cross-arms, the electric field distribution in the uni-body composite cross-arm is of considerable interest. This paper presents and analyses the electric field distribution around and inside the hollow core uni-body cross-arm through which ground cable passes to connect the shield wires. Two different shed profiles are considered on the cross-arm and evaluated based on the guidelines of IEC 60815-3. The 2D geometry of pylon is modeled in ANSYS Finite Element Analysis package. The electric field and potential distribution along the pylon is graphically depicted and the effectiveness of assigned shed profiles in controlling the power frequency stresses are investigated in the areas with high field intensities.
Highlights
Modern day overhead transmission lines are taking a giant leap in modernization, with the change in power generation from fossil fuels to renewable sources such as solar power, hydro power and wind power
Real component of potential distribution around the fully composite pylon without ground cable is illustrated in Fig. 2, which is influenced by the earth surface and shield wires
For the left circuit of pylon, electric field distribution on the uniform sheds, within fiberglass layer and at 0.5 mm from insulation surface is shown in Fig. 3 based on targeted axis ranges (The tip of the unibody cross-arm is located at x=0)
Summary
Modern day overhead transmission lines are taking a giant leap in modernization, with the change in power generation from fossil fuels to renewable sources such as solar power, hydro power and wind power. It means that more than 100.000 new pylons will be needed [1] For this reason, the generation of overhead line is introduced, by developing new design pylons that are easier to erect, less costly, smaller and better looking than the old ones, which is important to get public acceptance. The generation of overhead line is introduced, by developing new design pylons that are easier to erect, less costly, smaller and better looking than the old ones, which is important to get public acceptance In this regard, a fully composite-based pylon for 400 kV lines is presented with a new innovative design concept. The effectiveness of assigned shed profiles is investigated by considering some criteria regarding to the power frequency stresses constraints on the unibody cross-arm
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
