Modelling of partial discharge behaviour at DC applied voltage by USING ABC model

The increased application of HVDC components leads, at the same time, to forced usage of Partial Discharge (PD) measurement as an important tool for quality testing and reliability. Current issues are missing relations between the PD behaviour caused by insulation defects and the measured PD parameter as well as requirements for appropriate PD measuring systems. The adequate modelling of PD behaviour under DC conditions could improve that situation and might lead to deeper understanding of physical PD processes within the insulation. The paper deals with the modelling of partial discharge behaviour at DC condition by using a modified three capacitances (abc) model and compares it with its behaviour at AC applied voltage. The improved model has been used to study the effect of temperature, applied voltage, and void dimensions on partial discharge behaviours within a cylindrical void inside XLPE insulating material. The results show that under DC, the temperature rise will greatly affect the repetition rate, while the magnitude of the applied voltage is of higher influence in the case of AC. Also, the results show the magnitude of PD increases with higher void size, and the larger effect is the increase of the void radius

Modelling of partial discharge behaviour at DC applied voltage by USING ABC model

The increased application of HVDC components leads, at the same time, to forced usage of Partial Discharge (PD) measurement as an important tool for quality testing and reliability. Current issues are missing relations between the PD behaviour caused by insulation defects and the measured PD parameter as well as requirements for appropriate PD measuring systems. The adequate modelling of PD behaviour under DC conditions could improve that situation and might lead to deeper understanding of physical PD processes within the insulation. The paper deals with the modelling of partial discharge behaviour at DC condition by using a modified three capacitances (abc) model and compares it with its behaviour at AC applied voltage. The improved model has been used to study the effect of temperature, applied voltage, and void dimensions on partial discharge behaviours within a cylindrical void inside XLPE insulating material. The results show that under DC, the temperature rise will greatly affect the repetition rate, while the magnitude of the applied voltage is of higher influence in the case of AC. Also, the results show the magnitude of PD increases with higher void size, and the larger effect is the increase of the void radius

Partial discharge behavior on solid- air interfaces at AC stress condition

Partial discharge (PD) is one of the major factors that damage dielectric materials in medium and high voltage components. Therefore, partial discharge evaluation is generally used to observe the status of electrical insulation in high and medium voltage components used in the performance appreciation of an insulation system. In this work, partial discharge behavior on solid- air interfaces has been investigated commonly characterized as surface discharge. The investigation was performed by PD measurement as well as by adequate modelling for different insulating materials as the Natural Rubber (NR), Silicone Rubber (SiR), Ethylene Propylene Diene Monomer Rubber (EPDM) and High- Density Polyethylene (HDPE). Through modeling the partial discharge process, a better conception of the phenomenon may be achieved. The model of different homogeneous insulating materials has developed using Finite Element Analysis (COMSOL) software in parallel with MATLAB programming function. The results of the study indicate that the repetition rate and the peak apparent charge increased with the insulating material relative permittivity increase while the inception voltage does not change significantly