Influence of Corrosion on Electrical and Mechanical Properties of Porcelain Suspension Insulators: An Overview
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Transactions on Electrical and Electronic Materials https://doi.org/10.1007/s42341-020-00239-3
REVIEW PAPER
Influence of Corrosion on Electrical and Mechanical Properties of Porcelain Suspension Insulators: An Overview Simpy Sanyal1 · Taeyong Kim1 · Seongho Jeon1 · Youn‑Jung Lee1 · Junsin Yi1 · In‑Hyuk Choi2 · Ju‑Am Son2 · Ja‑Bin Koo2 Received: 18 June 2019 / Revised: 2 September 2020 / Accepted: 7 September 2020 © The Korean Institute of Electrical and Electronic Material Engineers 2020
Abstract Corrosion of porcelain insulators has become a consequential threat to the secure and steady performance of power utilities. The losses due to corrosion have been calculated to be approximately 2–5% of the gross national product of any country. Under the influence of various contaminated environment, space between lower surface of iron cap and porcelain surface bridged by water which supports corrosion in iron cap and pin because of electrolytic process. Investigations validate corrosion found within metal part of insulators can worsen the bond between metal part and other accessories surrounding it and degrade its electrical and mechanical characteristics. These issues can be suppressed partially by utilizing various approaches such as washing and greasing of insulators, utilizing corrosion resistant metals and nonmetallic pins, zinc sleeve concept and U-shaped zinc ring etc. This paper highlights principle of corrosion mechanism especially focusing on corrosion occurs in metal part of insulators, causes of corrosion, dominance of pin and iron cap corrosion on mechanical and electrical characteristics of insulators. Furthermore, various approaches for suppression of corrosion in metal part of suspension insulators have been reviewed. Keywords HVDC · Electrolytic corrosion · Mechanical characteristics · Electrical characteristics · Suppression measures · Zinc sleeves · Zinc ring
1 Introduction Rapid development in economy, lead to increase of power grid globally, as well as the development of HVDC technology. Porcelain suspension-type insulators are generally used in such projects because of its superior insulation properties, heat resistant and anti-aging characteristics. Corrosion can be termed as deterioration of metal due to chemical reactions between it and the surrounding environment. Contamination and humidity have been identified as primary sources of corrosion of insulators. It is responsible for damage of insulators which lead to power system failure. Moreover, the loss caused by corrosion has been calculated to be of the order of 2–5% of the gross national product (GNP) of any country. * Junsin Yi [email protected] 1
School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon 03063, Republic of Korea
KEPCO Research Institute, Daejeon 34056, Republic of Korea
2
Considerable research has been carried out to prevent corrosion of insulator, yet it has not been eliminated entirely [1]. Generally, three types of corrosion exist for insulators. First one is Stress corrosion which lead
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