Inductively coupled on-line impedance measurement for condition monitoring of electrical equipment

• Main Authors: Rathnayaka, Sooriya Bandara, See, Kye Yak, Li, Kangrong
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2018
• Subjects: Condition Monitoring; On-line Impedance Extraction Technique
• Online Access: https://hdl.handle.net/10356/87717; http://hdl.handle.net/10220/45491
• Institution: Nanyang Technological University

Off-line periodic maintenance has been used to keep critical electrical equipment in good condition. However, there is an increasing demand for on-line condition monitoring of the electrical equipment for preventive maintenance purposes. An on-line impedance extraction technique based on an inductive coupling approach is explored for the detection of early signs of defects of electrical equipment. The proposed method is demonstrated experimentally using a custom-made transformer with emulated defects as equipment-under-test. To enhance the defect detection capability for impedance deviation, various statistical diagnostic indicators are also investigated. By combining the proposed on-line impedance extraction method and a suitable diagnostic indicator, early detection of the defect in electrical equipment becomes feasible.