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Performance of Composite Outdoor Insulator under Superimposed Direct and Switching Impulse Voltages

Pinzan, Davide, Branco, Fabio, Haddad, Manu, Slama, Mohammed El Amine, Albano, Maurizio, Waters, Ronald T. and Leite, Helder 2020. Performance of Composite Outdoor Insulator under Superimposed Direct and Switching Impulse Voltages. IEEE Transactions on Power Delivery 10.1109/TPWRD.2020.3003980

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Abstract

In High Voltage Direct Current (HVDC) systems, composite outdoor insulators play a critical role and focus is needed on the research of their failure. In the case of a pole to ground fault of a bipolar scheme, the healthy pole experiences an overvoltage similar to a Switching Impulse (SI) superimposed on the operational DC voltage. However, there is no standard test for such voltage superimposition. This paper investigates the performance of a composite insulator stressed with such superimposition under dry and rain conditions. To determine the direct voltage influence on the flashover voltage, the results have been compared with the SI only case. Four different rain conductivities have been used in the test programme. Both vertical and horizontal orientations have been studied. Most cases show that direct voltage pre-energisation has a negative impact on the flashover performance. The increase in rain conductivity leads to lower flashover values, and the horizontal orientation outperforms the vertical configuration. Under these test conditions, the flashover voltages were all larger than a typical DC operational switching surge. Thus, in the case of pole to ground fault, the healthy pole failure risk seems small. Further research is needed on higher voltages and polluted conditions.

Item Type: Article
Date Type: Published Online
Status: In Press
Schools: Engineering
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
ISSN: 0885-8977
Date of First Compliant Deposit: 22 January 2021
Last Modified: 22 Jan 2021 14:15
URI: http://orca.cf.ac.uk/id/eprint/137863

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