Electric field computation for a 400 kV composite cross-arm

Abstract

Abstract-If not well designed, high voltage composite insulators are prone to ageing and failure due to corona and electric field stress. Particular care is required designing areas where the metal end connections meet the insulator core, otherwise a large electric field enhancement is observed. It is difficult to completely eradicate corona on any insulator, thus manufacturers try and minimise this phenomenon by designing the assembly to increase the corona inception voltage across the end connections and other metallic components. Often this involves introduction of corona rings, especially at the high voltage end of the composite insulator, to manage the magnitude of the electric field. The use of FEA to design corona/grading rings and optimise their position has recently been of great interest. The present paper reviews the use of FEA simulation to design stress relief devices across the high voltage end of a composite insulating cross-arm. Design work has been realised in practice and verified using corona inception measurements and compared to previous FEA results.

Electric Field Improvement for High-Voltage Bushings

“…In the electrostatic field setting, it is not necessary to solve the specific potential in the capacitor screen, but only the electric field distribution of the dielectric on the oil side and the bushing itself. The grid division method and selected accuracy of the capacitor screen refer to the following papers: [ 30 , 31 , 32 , 33 ]. Therefore, the terminal domain feature can be selected in the setting of the physical field interface.…”

Optimised performance of cap and pin insulator under wet pollution conditions using a mono-objective genetic algorithm

“…The electric field profile has peak regions, particularly near the metallic fittings at which dry bands are formed [29]. The optimized performance of a high voltage insulator is closely linked to the effective minimization of the electric field stress along its creepage length, especially around metallic fittings [30]. That is why a particular attention is given to the pin region at which the electric field magnitude is expected to be the highest.…”

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

“…[6]. Electrostatic analysis using FEM allows the designer to engineer different models and variations in the design before high voltage testing, thus saving time and money as the need to manufacture several working prototypes is eradicated [7]. In this paper, a uniform and an alternating large and small shed profile designs are separately assumed for shed housing of the unibody cross-arm.…”