Design of corona control rings for EHV/UHV line hardwares and substations

Chatterjee, Sreenita and kumar, Udaya (2012) Design of corona control rings for EHV/UHV line hardwares and substations. In: 10th IEEE International Conference on the Properties and Applications of Dielectric Materials (ICPADM), JUL 24-28, 2012 , Bangalore, INDIA.

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Abstract

The components of EHV/UHV lines and substations can produce significant corona. To limit the consequent Radio Interference and Audible Noise on these systems, suitable corona control rings are employed. The shapes of these rings could vary from circular to rectangular with smooth bends. Many manufacturers seem to adopt trial and error method for arriving at the final design. As such neither the present testing standard nor the final design adopted consider the practical scenario like corona produced by deposition of dirt, bird droppings, etc. The present work aims to make a first step in addressing this practically important problem. This requires an accurate evaluation of the electric field and a reliable method for the evaluation of corona inception. Based on a thorough survey of pertinent literature, the critical avalanche criteria as applicable to large electrodes, has been adopted. Taking the rain drop on the surface as the biggest protrusion, conducting protrusions modeled as semi-ellipsoid is considered as representative for deposition of dust or the boundary of bird droppings etc. Through examples of 4 00 kV and 765 kV class toroidal corona rings, the proposed method is demonstrated. This work is believed to be useful to corona ring manufacturers for EHV/UHV systems.

Item Type:	Conference Proceedings
Series.:	International Conference on Properties and Applications of Dielectric Materials-ICPADM
Publisher:	IEEE, NEW YORK, USA
Additional Information:	Copyright for this article belongs to the IEEE, NEW YORK, USA
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	12 Dec 2012 06:18
Last Modified:	12 Dec 2012 06:18
URI:	http://eprints.iisc.ac.in/id/eprint/45517

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