American Journal of Applied Sciences

Electric Field in Polymeric Isolators of the 500kV Voltage Class

Huederson Aparecido Botura Da Silva, Vitor Chaves De Oliveira, Alexandre De Assis Mota and Lia Toledo Moreira Mota

DOI : 10.3844/ajassp.2013.628.637

American Journal of Applied Sciences

Volume 10, Issue 6

Pages 628-637

Abstract

This study presents a detailed study of the electric field in polymeric isolators of the 500kV voltage class through modifications in the dimensions of the anti-corona ring. That is, by varying the three dimensions of the anti-corona ring: height (h), distance of the anti-corona ring conductor (r) and the diameter of the anti-corona ring conductor (d); it was possible to observe the electric field distribution in a polymeric isolator of the 500 kV voltage class. Such voltage class in currently applied to prevent loss of energy in long transmission lines. However it faces disadvantages, like the problem of the increased corona effect, which besides generating electromagnetic noise, increases the level of the electric field around the conductors and the isolator. The corona effect is responsible for an electric energy loss that is in the order of hundreds of kW/km in TLs and generates noises that reach up to 65dBm. This effect occurs when the air’s critical value is exceeded, causing the electrons to collide with air resulting in the formation of ozone which is a major cause of corrosion in isolators. In this study, this issue is addressed and it is outlined sizing measures for manufactoring the anti-corona ring.

Copyright

© 2013 Huederson Aparecido Botura Da Silva, Vitor Chaves De Oliveira, Alexandre De Assis Mota and Lia Toledo Moreira Mota. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.