Partial discharges (PD) in large electric machines are a critical phenomenon often misunderstood. Partial discharges are neither harmless nor extremely dangerous. They indicate a localized electrical breakdown within the insulation of high-voltage equipment. Over time, especially in the long term, PD can deteriorate the insulation, leading to significant damage and potential failure of the machine. This paper addresses common misconceptions about PD, elucidating their implications for high voltage rotating machines based on existing literature and own research.
During routine on-line partial discharge (PD) spot testing of high-voltage (HV) cables in a European refinery, unexpected PD activity was detected from a connected 110 kV/6 kV, 63 MVA power transformer. Follow-up investigations and on-line PD monitoring identified multiple PD activities originating from the active part...
M. Huzmezan, Robert Madrasz, David Eckert· Electrical Insulation Confer...· 0 citations
Increasing power density of electrical devices in electrified transportation is an irreversible trend which involves power electronic-type supply, higher voltage and temperature. However, fast converter-switch rise times, high modulation and carrier frequencies, harmonics, and increased design field and temperature con...
G. C. Montanari, Muhammad Shafiq, Riddhi Ghosh et al.· Electronics· 0 citations
The second part of the article examines the data of Soviet scientists on the dependence of the electrical strength of insulation of power transformers on time in historical development. Where possible, the scatter values of break-down voltage and/or partial discharge initiation voltage have been extracted from the publ...
Inverter-fed motors are exposed to high dv/dt surge voltages that can initiate partial discharge (PD) in winding insulation, particularly under humid operating conditions. This study examines the effects of humidity on the repetitive PD inception voltage (RPDIV) using twisted-pair samples and a SiC-MOSFET-based pulse p...
High-voltage power lines can induce alternating current (AC) voltages on nearby gas pipelines, creating safety and corrosion risks. This article presents a French case study involving three gas pipelines exposed to severe interference from a 225 kV dual-circuit line over 17 km (10.6 mi).A Initial simulations predicted...
Paola Daza Acevedo, G. Dos Santos, A. Lefebvre et al.· Materials performance· 0 citations
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