Fem Analysis of TEV Sensor Design for Partial Discharge Detection in Power Transformers
Year: 2026
Type: conference-paper
Abstract: Partial discharge (PD) measurement is essential for assessing the insulation condition of power transformers, as PD is both a symptom and a cause of insulation degradation. The transient earth voltage (TEV) sensor is a non-intrusive technique that can be used during online operation of transformers. This paper aims to study the impact of the structure of the TEV sensor on its sensitivity. A$120 \mathrm{V} / 25 \text{kV}$transformer, including its active part and a TEV sensor, was modeled in COMSOL. Five parameters were investigated, including the thickness and material of the dielectric and electrode layers, as well as the effective sensing area of the sensor. The results reveal that insulation thickness and sensing area have the greatest influence on the detected TEV voltage amplitude compared with other parameters. The role of electromagnetic skin depth in the limited influence of electrode thickness was also discussed.
Authors: Mahdi Abbasi, Mathieu Lachance, Eric David
Institution: École de Technologie Supérieure
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W7207834872