Abstract
This study presents a detailed study of the electri c 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 dimensi ons of the anti-corona ring: height (h), distance of the a nti-corona ring conductor (r) and the diameter of t he anti-corona ring conductor (d); it was possible to observe the electric field distribution in a polyme ric isolator of the 500 kV voltage class. Such voltage class in currently applied to prevent loss of energ y in long transmission lines. However it faces disadvant ages, like the problem of the increased corona effect, which besides generating electromagnetic no ise, increases the level of the electric field arou nd 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, c ausing the electrons to collide with air resulting in the formation of ozone which is a major cause of co rrosion in isolators. In this study, this issue is addressed and it is outlined sizing measures for ma nufactoring the anti-corona ring.
Highlights
In recent years, Brazil has experienced a growth in its economy, this process has driven the expansion of various sectors, such as: commercial, residential and industrial
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
These three sectors have contributed in the growth of electricity consumption in Brazil, which for the last 10 years had an average growth of 4.29%, closing the year 2011 with 430,106 GWh consumed (Energy Research Company (ERC), 2012a)
Summary
Brazil has experienced a growth in its economy, this process has driven the expansion of various sectors, such as: commercial, residential and industrial. These three sectors have contributed in the growth of electricity consumption in Brazil, which for the last 10 years had an average growth of 4.29%, closing the year 2011 with 430,106 GWh consumed (ERC, 2012a). There is a study by the Energy Research Company (ERC) providing, in Brazil, an average growth of 4.5% in electricity consumption over the decade (ERC, 2012b). The growth of TL’s for the decade starting from 2011 to 2020 is expected to be at 42%, making the TLs extension expand from the current 110,000 km (data from 2010)
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