NDLI: Insulations of low-voltage equipment at high frequencies

Content Provider	IEEE Xplore Digital Library
Author	Hund, R. Pfeiffer, W.
Copyright Year	1993
Description	Author affiliation: Tech. Hochschule Darmstadt, Germany (Hund, R.; Pfeiffer, W.)
Abstract	The characteristics of selected insulation arrangements of low-voltage equipment at high-frequency voltage stress are examined. Increased dielectric losses as well as accelerated degradation by partial discharges (POs) at high frequencies were investigated. Tests were performed with voltages up to 6 kVp and frequencies up to 6.45 MHz. To generate these voltages the test equipment contains an electron tube amplifier and a resonance step-up transformer. Test specimen were insulating films with thicknesses between 5 /spl mu/m and 12 /spl mu/m. Both air and transformer oil were used to embed the electrodes. With the latter the insulating strength of the arrangement could be considerably increased. The experiments also show the limits of this improvement due to the decreasing partial-discharge (PO) inception voltage at high frequencies. In addition, printed-circuit boards with a test-electrode pattern were embedded with cast resin and tested at high frequencies. These experiments show increased dielectric losses at high frequencies both in the cast resin and in the base material.<>
Starting Page	514
Ending Page	519
File Size	250380
Page Count	6
File Format	PDF
ISBN	0780309669
DOI	10.1109/CEIDP.1993.378921
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1993-10-17
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency Dielectric losses Testing Power transformer insulation Dielectrics and electrical insulation Oil insulation Resins Voltage Stress Acceleration
Content Type	Text
Resource Type	Article

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