Abstract
Dielectric loss tanδ and partial discharge (PD) are important indicators for status assessment of oil-pressboard insulation. The correlation characteristics between these two parameters has significance for understanding the material’s degradation and helps to eliminate the information asymmetry for diagnostics. In this paper, the symmetric experimental platform is set up to measure the dielectric loss tanδ and PD for oil-pressboard insulation following the designed testing procedure consisted of raised and rested voltages. Three sets of samples with different water content were tested. The variation mechanism of tanδ with voltage is explained by proposed equivalent circuit, which introduced an asymmetric component representing defect part. PDs are found to be symmetric in the sinusoidal voltage cycles and their statistical parameters are calculated. Besides, the correlation between dielectric loss difference from raised voltage to rested voltage and PD is researched. Strong correlation is observed between dielectric loss and PD, which offers degradation insight for oil-pressboard insulation and helps to eliminate information asymmetry for material status diagnostics.
Highlights
Ramya M. et al found that water in pressboard papers makes the partial discharge inception voltage (PDIV) low and the PD occurred frequently, quickly leading to breakdown [21]
Great effort has been devoted into oil-pressboard characteristics, to charac of 14 create terize its degradation based on single parameter, e.g., dielectric loss or PD,2 may information asymmetry and lead to an incorrect result
This paper foand understand its mechanism, which is helpful for insulation/equipment condition diag cuses on the correlation between dielectric loss tanδ and PD for oil-pressboard material, nostics.which
Summary
Oil-pressboard insulation material is widely used in transformers, bushings, capacitors, etc. [1,2,3]. Great effort has been devoted into oil-pressboard characteristics, to charac of 14 create terize its degradation based on single parameter, e.g., dielectric loss or PD, may information asymmetry and lead to an incorrect result. Understanding their correlation offers insight into material’s degradation mechanism and new tools for diagnostics, which oil-paper insulation [22]. This paper foand understand its mechanism, which is helpful for insulation/equipment condition diag cuses on the correlation between dielectric loss tanδ and PD for oil-pressboard material, nostics.which.
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