Sep 2026· European Conference on Electrical Engineering and Computer Science· Vol 14327, pp. 143271G - 143271G-10· 0 citations· 15 references
Engineering
Abstract
Pre-insertion resistors are critical for suppressing inrush currents and switching overvoltages in Extra-High-Voltage (EHV) and Ultra-High-Voltage (UHV) circuit breakers; however, they continue to exhibit a significant failure rate. This study investigates the operational reliability of pre-insertion resistors by characterizing common mechanical and electrical failure mechanisms, specifically resistor element cracking, pollution flashover, and thermal breakdown. Through multi-physics finite-element analysis (FEA), the efficacy of mitigation measures—including aluminum foil buffering, polytetrafluoroethylene (PTFE) sleeving, and clearance optimization—is quantitatively evaluated. The results demonstrate a reduction in local stress and temperature rise of up to 30%. Furthermore, novel diagnostic methodologies, such as dynamic-resistance fitting and high-frequency impedance analysis, are proposed to facilitate both online and offline condition assessment. Finally, a lifecycle-oriented reliability framework integrating design, manufacturing, transportation, and intelligent maintenance is presented to ensure the safe and efficient operation of EHV/UHV power grids.
Solid-state transformers (SSTs) are pivotal for next-generation power systems, yet their widespread adoption is hindered by reliability uncertainties under diverse operational conditions. This paper introduces a mission-profile-aware, physics-of-failure (PoF) reliability assessment framework that explicitly links opera...
Mihirkumar Patel, Olga Lavrova, Manaswini Gangineni et al.· Energies· 0 citations
Thermal runaway (TR) initiation and propagation tests are essential for evaluating the safety of lithium-ion batteries (LIBs). However, differences among existing standards in application scenarios, test levels, initiation methods, boundary conditions, and acceptance criteria hinder direct comparison and cross-level tr...
Wide-bandgap (WBG) inverter drives impose repetitive high-frequency voltage stress, accelerating insulation degradation and increasing the probability of short-circuit faults in cables and machine windings. However, existing online diagnostic approaches face significant deployment barriers due to their sensitivity to e...
Yue Yu, Hu-Jun Peng, S. Steentjes· 2026 International Conferenc...· 0 citations
The vulnerability of REBCO insert magnets to extreme mechanical responses during open-circuit faults has caused severe failures in some high-field systems. This work studies the fault behaviors of a nested no-insulation/metal-insulation (NI/MI) REBCO insert in a 30 T magnet using the rotated anisotropic resistivity met...
The transition from point-to-point HVDC links to multiterminal HVDC (MT-HVDC) grids increases the need to understand how the interruption of DC current shapes transient dielectric stress on connected cable systems. This paper develops a compact parameterization of the DC circuit breaker–cable interface in a reduced 525...
T. Karmokar, Arjan Van Schijndel, Marjan Popov· 2026 International Conferenc...· 0 citations
The thermal reliability of high-voltage aerospace cables is increasingly important for hybrid-electric and all-electric aircraft; however, most thermal aging studies of perfluoroalkoxy alkane (PFA) have focused on isolated specimens and therefore do not establish how material-scale aging translates into the response of...
