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 power supply. Experimental results show that RPDIV decreases with increasing humidity. Analysis based on the volume-time theory indicates that this reduction is primarily caused by an increase in the electron emission from the insulation coating, while the influence of electron detachment from negative ions in air is negligible even in the high-humidity environment.
To investigate the development characteristics of winding interturn insulation partial discharge in a full-scale converter transformer, an interturn insulation defect specimen was installed inside a ±400 kV full-scale converter transformer. A partial-discharge test was conducted under stepwise alternating-current (AC)...
Yunpeng Tang, Shu-Chen Ma, Hong Liu et al.· Energies· 0 citations
The electric arc of a three-phase AC furnace is used as an energy source for melting scrap metal. The nonlinear nature of the electric arc directly affects voltage quality. This article presents an analysis of voltage variations recorded simultaneously at six points in the arc furnace power supply network. Results from...
Z. Olczykowski· Journal of Automation Electr...· 0 citations
This paper proposes a short-time AC voltage (STAC)-based insulation testing method for power cable lines, addressing the critical issue of cable insulation damage caused by space charge accumulation under DC oscillating wave excitation and overcoming the limitation of excessively short peak duration in existing methods...
Youxiang Yan, Tong Wu, Hong Chen et al.· International Conference on...· 0 citations
To address thermal-fatigue damage in power devices of photovoltaic inverters, this paper investigates a three-phase photovoltaic inverter and establishes a fourth-order Foster thermal-network model based on IGBT power-device parameters. Five MPPT control methods, namely fixed duty cycle, fixed-step perturb and observe...
Wen Li, Chunjie Wang, Kaixin Liu et al.· 2026 IEEE International Conf...· 0 citations
Insulators are vital components in electrical power transmission systems, yet they are susceptible to degradation caused by electrical and environmental stresses. This study aims to analyze Partial Discharge (PD) characteristics in glass and porcelain insulators as an early indicator of insulation failure. Experimental...
Syofyan Anwar Syahputra, Muhammad Fadlan Siregar, Muhammad Ikhwan Fahmi et al.· JET (Journal of Electrical T...· 0 citations
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