Accelerated Aging Studies on HVAC & HVDC Composite Insulators

Accelerated aging studies are performed to study the estimated and residual life of transmission composite insulators in service and to establish better condition monitoring techniques. Several experimental facilities pertaining to the study as per international standards have been developed to investigate and understand the performance of high voltage polymeric insulators as in real-world field conditions.

Experimental and theoretical investigations have been conducted using Corona, Rotating wheel dip facility and Multi stresses aging facilities developed as per IEC 62217 with additional features. Our work is the first one to analyze and quantify the corona discharges using image processing techniques. Further, exhaustive accelerated aging investigations have been conducted.


Sounak Nandi and Subba Reddy B, “Transient Electric Field Analysis for Polluted Composite Insulators under HVDC Stress”, IEEE Transactions on Power Delivery, Vol: 36, No. 2, APRIL 2021, pp-607-617

Shakthi Prasad D and Subba Reddy B, “Image Saturation as a Tool to Understand the Corona Induced Degradation of Polymeric Insulators”, IEEE Transactions on Dielectrics & Electrical Insulation, Vol: 27, No. 6; December 2020, pp 1837-1844

Sounak Nandi and Subba Reddy B, “Understanding Field Failures of Composite Transmission Insulators”, Journal: Engineering Failure Analysis, Elsevier, 116 (2020) 104758, July 2020, pp. 1-10

Faculty: B. Subba Reddy, EE
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