Dr. HADI NADERIALLAF HADI.NADERIALLAF@NOTTINGHAM.AC.UK
Research Fellow
Modeling Humidity Impact on PDIV for Turn-to-Turn Insulation of Inverter-Fed Motors at Different Temperatures
Naderiallaf, H.; Ji, Y.; Giangrande, P.; Galea, M.
Authors
Y. Ji
P. Giangrande
M. Galea
Abstract
This paper models the partial discharge inception voltage (PDIV) as a function of ambient humidity ( H ) at various temperatures ( Ts ) using Schumann’s streamer inception criterion (SCSIC) for turn-to-turn insulation, which is the most vulnerable part in inverter-fed motors’ insulation system. The Schumann constant (i.e., the natural logarithm of the critical electron number defining the Townsend-to-streamer discharge transition, K ) varies with H , showing distinct patterns at low and high Ts . The K equations are derived across a wide range of relative humidity (RH) levels (20%, 30%, 40%, 50%, 60%, 70%, 80%, and 90%) at four Ts (25°C, 40°C, 60°C, and 90°C). These equations can be used in finite element analysis software to predict PDIV under varying H with outstanding accuracy. Additionally, a novel approach is presented for partial discharge (PD) phenomenology under H variations at different Ts using SCSIC-derived streamer inception parameters (SIPs): critical field line length (CFLL), air effective ionization coefficient (α eff ), partial discharge (PD) inception field ( E inc ) and firing voltage ( V firing ). Notably, at high Ts (e.g., 90°C), a transition phase emerges concerning RH, leading to significant SIP changes due to the disappearance of a critical region (CritR) in α eff at specific electric field intensities. The developed humidity-dependent PDIV model supports insulation designers in achieving PD-free designs that account for H variations and sheds light on SIPs variations concerning H changes.
Citation
Naderiallaf, H., Ji, Y., Giangrande, P., & Galea, M. (2024). Modeling Humidity Impact on PDIV for Turn-to-Turn Insulation of Inverter-Fed Motors at Different Temperatures. IEEE Transactions on Dielectrics and Electrical Insulation, 31(3), 1573-1582. https://doi.org/10.1109/tdei.2023.3338138
Journal Article Type | Article |
---|---|
Acceptance Date | Nov 27, 2023 |
Online Publication Date | Nov 30, 2023 |
Publication Date | 2024-06 |
Deposit Date | Dec 2, 2023 |
Publicly Available Date | Dec 4, 2023 |
Journal | IEEE Transactions on Dielectrics and Electrical Insulation |
Print ISSN | 1070-9878 |
Electronic ISSN | 1558-4135 |
Publisher | Institute of Electrical and Electronics Engineers |
Peer Reviewed | Peer Reviewed |
Volume | 31 |
Issue | 3 |
Pages | 1573-1582 |
DOI | https://doi.org/10.1109/tdei.2023.3338138 |
Keywords | Electrical and Electronic Engineering |
Public URL | https://nottingham-repository.worktribe.com/output/27872020 |
Publisher URL | https://ieeexplore.ieee.org/document/10335747 |
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Modeling Humidity Impact on PDIV
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