Partial discharge performance of lapped plastic insulation for superconducting power transmission cables and the dielectric strength of supercritical helium gas (original) (raw)
Related papers
International Journal of Engineering Research and Technology (IJERT), 2020
https://www.ijert.org/comparison-of-partial-discharges-occurring-in-the-sf6-n2-1090-gas-mixture-between-uniform-electrodes https://www.ijert.org/research/comparison-of-partial-discharges-occurring-in-the-sf6-n2-1090-gas-mixture-between-uniform-electrodes-IJERTV9IS090481.pdf Partial discharge (PD) is an electric discharge that does not completely bridge the space between the two conducting electrodes. In all the high voltage operating devices, normally partial discharge activity will be present. The usage of spacers in between the electrodes will increase the insulation strength and reduces the intensity of PD provided the spacer material happened to be healthy without any leakage paths either through the material or through the surface discharges. As the time prolongs the PD activity inside the insulation media leads to breakdown of insulation. The study of PD is necessary to understand the performance of Insulator operating at high voltages and gives the idea to improve its performance. The usual cause of PD activity is the presence of any conducting metal particles on the electrodes or on the spacers. If the spacers are defective then also there will be conductive path either through the material or surface discharge. Another possible reason for PD is having voids of any shape in the insulating spacers creates the weak zone in the insulating material and responsible for the occurrence of PD. The PD activity inside an insulator needs to be monitored continuously. Though the PD discharges in the magnitude of micro coulombs, but their continuous presence makes the progressive deterioration of insulation and may lead to failure of insulation. In this work experiments have been conducted on plane-plane electrodes with insulating spacers Polymethylmethacrylate (PMMA) of cylindrical shape of different thicknesses have been used as dielectric between the electrodes when the chamber is filled with SF6-N2 gas mixture with varying pressure. The following data has been taken while performing the PD test.. The discharge current (ID), Discharge Power (PDis) and number of PD events per second with respect to the phase angle .are noted in this paper. To plot the PD graphs of 2D and 3D the Omicron MPD 600 software and hardware are employed. Keywords: Discharge Current (ID), Discharge Power (PDis), number of events per second (n), Spacer.
2003
Abstract: The problem of insulation damage from partial discharges below the socalled inception voltage has not attracted much attention from the insulation community. Indications of possible damage exist from previous research. In the present paper, the possibility of existence of such phenomena is investigated with small air gaps and non-uniform electrode arrangements. It is shown that random discharges below inception voltage exist, which on occasions can be quite numerous. Such discharges are registered and their implications are discussed.
Partial discharge patterns in high voltage insulation
2012 IEEE International Conference on Power and Energy, PECon 2012, 2012
Partial discharge (PD) is an electrical discharge, which does not bridge the electrodes between an insulation system completely under high electric field stress. PD events may affect the performance of insulation system because in long term, it may cause the breakdown of insulation system and failure of high voltage component due to repetition of PD events. In this work, two techniques of analysing PD data have been studied; the phase resolved partial discharge (PRPD) pattern and pulse sequential analysis (PSA) techniques. These two techniques were used to distinguish three main types of PD; they are corona, void and surface discharges. PD data were obtained from the measurement in high voltage laboratory in the University of Southampton, UK. In the end of the analysis, comparison between the PRPD and PSA methods was done to evaluate the advantages and disadvantages between the two techniques.
Partial discharge measurements for investigating defected solid dielectrics
TELKOMNIKA (Telecommunication Computing Electronics and Control), 2021
Insulation system in high voltage power equipment plays an important role for the reliability of the electric power system. So, it is necessary to assess its performance to prevent any sudden interruption in the power system. Partial discharge (PD) in solid dielectrics could occur due to the presence of a cavity or a crack within the insulating material which could be formed during manufacturing, installing or/and operating conditions. Since internal cavities are the main source of the PD activities, they can lead to causing deterioration of the insulation system and consequently a complete failure may be occurred. In this paper, PD measurement and simulation are performed on a rubber insulating material with variable cylindrical cavity diameters. High-frequency current transformer (HFCT) technique is introduced for PD measurement. Therefore, a PD simulation model is developed using COMSOL Multiphysics program interlinked with MATLAB software in order to investigate the influence of...