Electric Field and Potential Distribution in a 420 kV Novel Unibody Composite Cross-Arm

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.

Electric Field Modelling and Simulation of the High-voltage High-frequency Transformer Insulation Applied for Power Electronics Based on Circuit-field Coupling Analysis

“…The insulation of the HVHF transformer suffers from high electrical stress for a long term, which has become one of the main contributors to its aging, failure, and breakdown [3][4]. However, the electrical stresses applied to the insulation are difficult to measure experimentally [5]. Studying the electric field distribution and insulation performance of the HVHF transformer is of great significance to its optimal design, condition monitoring, and lifetime prediction.…”

Design of an Internal Down-Lead System for a 400 kV Composite Tower and Investigation of Lightning Performance

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