Applied IT & Engineering
Information and engineering sciences | Online ISSN 3068-0115
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Volume 2 Number 1 2024
RESEARCH ARTICLE (Open Access)
Key Factors Affecting High-Voltage Insulation Performance: Evidence from Environmental Contamination, Partial Discharge, and Preventive Maintenance
Md Shahdat Hossain1*, Uravang Patel1, Farabi Hasan Chadni1
Applied IT & Engineering 2 (1) 1-8 https://doi.org/10.25163/engineering.2110771
Submitted: 05 August 2024 Revised: 16 October 2024 Accepted: 21 October 2024 Published: 22 October 2024
Abstract
Background: Reliable insulation is essential for the safe and stable operation of high-voltage transmission and distribution systems. In practice, however, insulation performance gradually declines under the combined influence of environmental contamination, moisture, partial discharge, electrical stress, mechanical loading, and natural aging. Although these mechanisms are widely recognized, their relative importance in operational settings is still not always clearly prioritized.
Methods: This quantitative study assessed insulation performance using structured questionnaire data collected from 180 professionals involved in high-voltage systems, including electrical engineers, substation operators, maintenance technicians, and field supervisors. The study examined major degradation-related factors and improvement techniques through descriptive statistics, mean ranking, Pearson correlation analysis, and multiple regression analysis. An Insulation Performance Index was used as a structured measure of insulation condition, while statistical analysis explored the relationships among contamination, partial discharge, aging, moisture, maintenance, and monitoring practices.
Results: Environmental contamination was identified as the most influential factor affecting insulation performance, with the highest mean score of 4.40. Partial discharge and insulation aging followed closely, with mean scores of 4.30 and 4.20, respectively. Preventive maintenance was the most widely adopted improvement strategy, reported by 52.8% of respondents, whereas condition monitoring was adopted by 21.1%. Pearson correlation showed a strong association between partial discharge and insulation aging (r = 0.71), as well as between environmental contamination and moisture influence (r = 0.69). Regression analysis further indicated that partial discharge, insulation aging, environmental contamination, and moisture were significant predictors of insulation performance, while preventive maintenance and condition monitoring showed protective associations.
Conclusion: The findings suggest that high-voltage insulation reliability depends on an integrated approach that combines environmental risk control, discharge monitoring, preventive maintenance, and gradually expanded use of advanced diagnostic technologies.
Keywords: High-voltage insulation; Partial discharge; Environmental contamination; Preventive maintenance; Condition monitoring
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