Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Ondrej Sefl"'
Publikováno v:
IEEE Transactions on Power Delivery. 36:1882-1891
Switching processes of voltage source converters can emit significant high-frequency distortions of frequencies between 5 to 20 kHz. Furthermore, the distortions can partly propagate from the place of their origin into a medium voltage system via cap
Publikováno v:
2021 44th International Spring Seminar on Electronics Technology (ISSE).
Although stereolithography (SLA) is the oldest 3D printing method, only a few works have been published about the complex electrical properties of objects printed from unfilled photopolymerizable resins. In this paper, we describe how the dielectric
Autor:
Ondrej Sefl, Radek Prochazka
Publikováno v:
International Journal of Electrical Power & Energy Systems. 134:107440
This research paper investigated the influence of lower-order supraharmonics on partial discharge activity in an insulation system sample with a predefined spherical cavity defect. The supraharmonics were represented by repetitive sinusoidal oscillat
Autor:
Radek Prochazka, Ondrej Sefl
Publikováno v:
2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika).
Electrical insulation materials, especially polymers, may contain miniature internal voids. Insulation systems created from such materials might hence suffer from the development of partial discharges in the voids. These discharges tend to erode the
Publikováno v:
2020 International Conference on Diagnostics in Electrical Engineering (Diagnostika).
The degradation of plastic materials induced by solar radiation can limit their use in outdoor applications. Therefore, we aimed to find a relationship between the photodegradation of 3D printed polylactic acid (PLA) and its electrical and thermomech
Publikováno v:
2019 42nd International Spring Seminar on Electronics Technology (ISSE).
The aim of this work was to evaluate the use of FFF (Fused Filament Fabrication) technology in high and medium voltage applications. The research is based on previous work, where the dependence of dielectric strength of 3D printed objects on printing
Publikováno v:
2018 IEEE International Conference on High Voltage Engineering and Application (ICHVE).
Frequent use of power electronics in electrical power systems imposes significant impulse and harmonic voltage stresses on various insulation systems. These systems are stressed by very fast and repetitive voltage distortions, which are superimposed
Publikováno v:
2018 International Conference on Diagnostics in Electrical Engineering (Diagnostika).
In the recent years, technological development gave rise to numerous systems that utilize power semiconductor devices. As much as these devices improve the performance of electrical systems, they also pollute the network with voltage distortions. A m
Publikováno v:
2017 IEEE Conference on Electrical Insulation and Dielectric Phenomenon (CEIDP).
Over the last few years, nonstandard voltage stresses have begun to occur in electrical power systems as a consequence of power electronics usage. Power semiconductors contribute to the advanced management and current quality control of power flow. A
Publikováno v:
High Voltage; Jun2024, Vol. 9 Issue 3, p710-720, 11p