Investigation of partial discharges in non-woody kenaf based pressboard under influence of moisture

Rizda Fitri Kurnia (Department of Electrical Engineering, Faculty of Engineering, Sriwijaya University, Ogan Ilir 30128, South Sumatra, Indonesia)
Norhafezaidi Mat Saman (Institute of High Voltage and High Current, School of Electrical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor.)
Mohd Hafizi Ahmad (Institute of High Voltage and High Current, School of Electrical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor.)
Zainuddin Nawawi (Department of Electrical Engineering, Faculty of Engineering, Sriwijaya University, Ogan Ilir 30128, South Sumatra, Indonesia)
Nur Azalia Azrin (Institute of High Voltage and High Current, School of Electrical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor.)
Mohd Aizam Talib (Tenaga Nasional Berhad Research, No. 1, Kawasan Institusi Penyelidikan, Jalan Ayer Itam, Kajang 43000, Selangor, Malaysia)

Indonesian Journal of Electrical Engineering and Computer Science
Vol 28, No 3: December 2022

The most crucial parts that decide the transformer’s lifetime are the solid insulation of the power transformer, especially the pressboard and kraft paper. The life of the insulation is significantly influenced by the presence of water in the insulation. This paper presents a study on partial discharge (PD) on the existing normal pressboard (NP) and the newly developed Kenaf-polypropylene pressboard (KPP). Also, the moisture content of the pressboard varied between 0%, 1%, and 3% by the percentage weight of different methods. After the initiation of PD, the surface deterioration analysis was performed by using scanning electron microscopy (SEM). The results from the study revealed that KPP shows superior performance in mitigating PD. At 0%, 1% and 3% moisture contents, KPP showed 89%, 83% and 25% reductions in average PD magnitude, respectively. Overall, the kenaf composite pressboard has better PD resistance, which is one of the things to think about when insulating a transformer.