3D Model of partial discharge in defects with different sizes and positions in power cable for distribution and transmission networks. Issue 9 (28th October 2020)

• Record Type: Journal Article
• Authors: Ragusa, Antonella; Sasse, Hugh; Duffy, Alistair Paul
• Is Part Of: IET science, measurement & technology. Volume 14:Issue 9(2020)
• Page Start: 776
• Page End: 783
• Publication Date: 2020-10-28
• Subjects: resins -- condition monitoring -- partial discharges -- overhead line conductors -- power distribution lines -- voids (solid) -- power cables -- partial discharge measurement; on‐line PDs location methods -- three‐dimensional model -- PD events -- electric‐field distribution -- 3D–1D hybrid model -- PD signals -- power networks -- power cable -- transmission networks -- partial discharge phenomena -- electrical insulation -- insulation condition -- degradation state -- PDs cause signals -- noise phenomena -- insulation degradation -- disruptive fault -- power supply -- early warning indicators; Measurement -- Periodicals; Electrical engineering -- Periodicals; Electronics -- Periodicals; Nanotechnology -- Periodicals; Electromagnetism -- Periodicals; Medical instruments and apparatus -- Periodicals; 621.3
• DOI: 10.1049/iet-smt.2019.0351
• Languages: English
• ISSNs: 1751-8822

Abstract

Abstract : The knowledge of partial discharge (PD) phenomena inside electrical insulation of power cables is an important issue for assessing the insulation condition and its degradation state, obtaining information about the likelihood of failure. PDs cause signals to propagate along the cable, as noise phenomena, and contribute to the insulation degradation, culminating in a disruptive fault with the interruption of power supply. Therefore, PDs are considered the best 'early warning' indicators of insulation degradation and their modelling, with the development of on‐line PDs location methods, are important topics to increase the networks' electricity security. In this study, a three‐dimensional (3D) model of PD events using the CST STUDIO® Dassault software is proposed. PDs inside air inclusions in epoxy‐resin are analysed with different shapes, positions and sizes of the defect. The electric‐field distribution is evaluated with the conduction current inside the void and the apparent charges induced on the electrode. The effectiveness of the model is validated by comparing the simulation results with other published experimental results. Finally, a description of a 3D–1D hybrid model useful to describe the propagation of PD signals in power networks is given.