Evaluation of HVDC ripple effect on partial discharge testing using a hybrid method

Zhang, Kai, Reid, Alistair ORCID: https://orcid.org/0000-0003-3058-9007, Clark, David ORCID: https://orcid.org/0000-0002-1090-2361 and Haddad, Abderrahmane ORCID: https://orcid.org/0000-0003-4153-6146 2024. Evaluation of HVDC ripple effect on partial discharge testing using a hybrid method. Presented at: ISH 2023, Glasgow, Scotland, 28 August 2023. Proceedings 23rd International Symposium on High Voltage Engineering. IET, pp. 1089-1094. 10.1049/icp.2024.0765

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Abstract

This paper presents a needle-to-plane test setup to simulate one typical potential defect in high voltage direct current gas insulated switchgear, and correspondingly evaluate its generated partial discharge characteristics under multi-order high voltage direct current harmonic components. An arbitrary waveform high voltage source was used to stress insulation defects under different excitation voltages especially sinusoidal ac and dc with impressed ripple. Discharge behaviour was measured simultaneously using an ultra-high frequency antenna and high-frequency current transformer. Of particular interest are the novel phase resolved partial discharge algorithm that could be adopted in dc ripple conditions to evaluate the discharge behaviours, along with the simultaneous identification of discharge distribution under dc ripple and ac conditions without phase reference. The comparable results revealed that dc ripple discharge distribution and amplitude have more correlation to the peak of repetitive harmonic content by applying the same post-processing methodology, while ac partial discharge distribution and diagnostics method in the phase domain is directly decided by the power frequency. It was found that while the phase resolved patterns are drastically different under ac and dc ripple, the correlations between the energy of the radiated discharge and its apparent charge are similar in both cases. Hybrid techniques may therefore offer a new approach for distinguishing between partial discharge behaviour in ac and dc systems in the absence of a phase reference by analysing the relationship between the two measured quantities that yields more information on the shape of the current pulse and the physics of partial discharge.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Published Online
Status:	Published
Schools:	Engineering
Publisher:	IET
ISBN:	978-1-83953-992-3
Last Modified:	19 Jul 2024 09:02
URI:	https://orca.cardiff.ac.uk/id/eprint/170108

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