Risk assessment of polluted glass insulator using leakage current index under different operating conditions

Salem, Ali Ahmed and Abd-Rahman, Samir Ahmed and Al-Gailani, Samir Ahmed and Salam, Zainal and Kamarudin, Muhammad Saufi and Zainuddin, Hidayat and Mohd Yousof, Mohd Fairouz (2020) Risk assessment of polluted glass insulator using leakage current index under different operating conditions. IEEE Access, 8 (NIL). pp. 175827-175839. ISSN 2169-3536

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Official URL: https://dx.doi.org/10.1109/ACCESS.2020.3026136

Abstract

In this article, an innovative approach to assess the risk of uniform/non-uniform pollution and wet high voltage glass insulator is proposed. The assessment is based on a new index, named as Rhi, which is derived from the 3rd, 5th and 7th harmonics of the leakage current. Two 33 kV strings of cap and pin glass insulators having three units with different profiles are employed to evaluate the risk level, based on measured critical voltage gradient (Ec). Critical voltage stress tests are executed on the contaminated insulators under different ratios of lower to upper surface (J) and wetting rates. Furthermore, the effects of ratio of soluble deposit density (ESDD) to non-soluble deposit density (NSDD) on the flashover occurrence are analyzed. It was found that the insulator profile has significant influences on the likelihood of flashover which is estimated as 38% and 24% for type A and B insulators, respectively. From the results, it can be concluded that the proposed Rhi index is able to predict the risk level of the insulator and the probability of flashover occurrence more accurately than the 5th/3rd index, which is widely published in literature.

Item Type:	Article
Uncontrolled Keywords:	Polluted insulators; Risk assessment; Leakage current harmonics; Fast Fourier transform; Glass insulator.
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering H Social Sciences > HD Industries. Land use. Labor > HD28-70 Management. Industrial Management > HD61 Risk in industry. Risk management
Divisions:	Faculty of Electrical and Electronic Engineering > Department of Electrical Engineering
Depositing User:	Miss Nur Rasyidah Rosli
Date Deposited:	30 Jan 2022 07:16
Last Modified:	30 Jan 2022 07:16
URI:	http://eprints.uthm.edu.my/id/eprint/6363

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