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Influence of Salt Fog Test on Silicone Rubber Insulating Material Under AC and DC Voltages

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Abstract

The present work investigates the performance of electrically stressed silicone rubber insulating material in a cyclic salt fog test. Corona Inception Voltage due to water droplet initiated discharges changes after salt fog ageing. The Ultra High Frequency signals radiated during corona discharge activity under AC voltages have a frequency span of 0.8–1.5 GHz, whereas under DC voltages span lies in the range of 0.5–1.5 GHz. Contact angle reduces with the increase in number of salt fog ageing cycles. Surface potential accumulation studies indicate that salt fog aged silicone rubber shows characteristic variation in accumulated potential magnitude and the decay characteristics. Further tdv/dt of surface potential decay characteristics enables to understand the charge penetration depth. Weight loss studies and surface roughness analysis during salt fog test are used to quantify the amount of damage.

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Authors and Affiliations

  1. Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai, 600036, Tamil Nadu, India

    Palash Mishra & R. Sarathi

  2. Department of Electrical Engineering, MNM Engineering College, Chennai, 600097, Tamil Nadu, India

    C. S. Gayathri

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  1. Palash Mishra
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  2. C. S. Gayathri
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  3. R. Sarathi
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Correspondence to R. Sarathi.

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Mishra, P., Gayathri, C.S. & Sarathi, R. Influence of Salt Fog Test on Silicone Rubber Insulating Material Under AC and DC Voltages. INAE Lett 4, 1–6 (2019). https://doi.org/10.1007/s41403-018-0059-7

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  • DOI: https://doi.org/10.1007/s41403-018-0059-7

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