Investigating Energization Transients and the Potentiality of Partial Discharge Inception and Damage in Nanofilled Polypropylene Insulation for DC Cables and Capacitors

Seri, Paolo and Ghosh, Riddhi and Naderiallaf, Hadi and Montanari, Gian Carlo (2019) Investigating Energization Transients and the Potentiality of Partial Discharge Inception and Damage in Nanofilled Polypropylene Insulation for DC Cables and Capacitors. [Preprint]
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Abstract

New nanostructured insulating materials are investigated, within the European project GRIDABLE, to be used for DC cable and capacitors. Besides electrical, thermal and mechanical properties, and life behavior, work is being done to evaluate their capability to endure highly stressing conditions as those cause by the inception of partial discharges, PD. This paper, in particular, analyzes what happens during energization of a DC cable or capacitors, when voltage goes from zero to the nominal value in a few seconds, while the internal electrical field takes longer time to reach the DC steady state configuration. During an energization transient, indeed, electrical field in insulation, and insulation defects (as cavities), is driven by permittivity, not conductivity as in steady state. Hence, PD might occur with high repetition rate, which would not occur, or at much lower repetition rate, in steady state. The way to evaluate the time constant of the transient, that is, through charging current measurement, is described and successfully fitted to the results of PD measurements performed on two types of polypropylene, PP: neat and nanostructured, and a cross-linked polyethylene, XLPE, having significantly different electrical characteristics.

Abstract
Document type
Preprint
Creators
CreatorsAffiliationORCID
Seri, PaoloUniversity of Bologna
Ghosh, RiddhiUniversity of Bologna
Naderiallaf, HadiUniversity of Bologna
Montanari, Gian CarloCenter for Advanced Power Systems, Florida State University, Tallahasse, USA
Subjects
DOI
Deposit date
29 Jan 2020 14:52
Last modified
29 Jan 2020 14:52
Project name
GRIDABLE - Plastic nanocomposite insulation material enabling reliable integration of renewables and DC storage technologies in the AC energy grid
Funding program
EC - H2020
URI

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