Kempf, Michael ; Koch, Myriam (2024)
Accelerated PD-aging of solid insulating materials under high frequency high voltage stress.
3. Fachtagung für Polymere Isolierstoffe in der Elektrotechnik: Verhalten, Alterung sowie Modellierung von polymeren Isolierstoffen und ihren Grenzflächen und deren Anwendung. Zittau, Germany (25.01.2024 - 26.01.2024)
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Kurzbeschreibung (Abstract)

Due to an increased integration of power electronic components in power grids and the continuous development of power semiconductors, insulation materials are exposed not only to high electric fields but simultaneously to strongly increased frequencies. This combination poses greater stress on most insulating materials compared to conventional operation. Thereby, both, their short- and long-term behavior can be negatively affected. Due to higher dielectric losses and the associated heat generated leading to accelerated aging of the material. The aim of this study is to investigate the aging behavior of solid insulating materials under the presence of partial discharges at high frequency test voltages. These results are compared with aging under 50 Hz stress. For this purpose, various long-term studies are conducted on epoxy resin test samples at different frequencies and voltage waveforms. As test voltages, both, sinusoidal high frequency high voltages (HFHV) and so-called mixed-frequency high voltages (MXF-HV) are used. The high frequencies range from 20 kHz to 2.5 MHz. As indicators of the test samples aging state the change of the dielectric parameters as well as the breakdown field strengths of the test samples are examined. In addition, the reduction in life-time due to different partial discharge aging stresses is evaluated.

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