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02647nam a2200481Ia 4500 |
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10.3390-en15093107 |
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220517s2022 CNT 000 0 und d |
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|a 19961073 (ISSN)
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|a Analysis of Polarization and Depolarization Currents of Samples of NOMEX® 910 Cellulose–Aramid Insulation Impregnated with Synthetic Ester
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|b MDPI
|c 2022
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| 856 |
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|z View Fulltext in Publisher
|u https://doi.org/10.3390/en15093107
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|a The paper presents the results of laboratory tests regarding the impact of accelerated thermal ageing of cellulose–aramid insulation samples saturated with electrical-insulating synthetic ester on the polarization and depolarization current characteristics being analyzed in the time domain. In the tests, electro-technical paper from DuPontTM was used, commercially designated as NOMEX® 910. Laboratory-accelerated ageing consisted of heating with air a supply of samples of not-impregnated cellulose–aramid insulation for a specified time at specified temperatures. The temperatures and the warming time were selected so as to faithfully represent the degree of the thermal degradation of the cellulose fibers that takes place during normal operation of the material in power transformers. To determine the described impact of the ageing process in the insulation samples on the dielectric properties, the Polarization and Depolarization Method was applied. In the measurements, the MIC-15k1 high resistance meter from SONEL S.A. was used. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
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|a %moisture
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|a activation energy
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|a Activation energy
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|a ageing effect
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|a Ageing effects
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|a Aramid insulation
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|a Aramid paper
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|a Cellulose
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|a cellulose–aramid paper
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|a Cellulose–aramid paper
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|a Depolarization
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|a dielectric polarization
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|a Dielectric properties
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|a Dielectrics polarization
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|a Esters
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|a moisture insulation
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|a Moisture insulation
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|a Oil filled transformers
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|a Polarization and depolarization currents
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|a power transformer insulation testing
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|a Power transformer insulation testing
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|a Power transformers
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|a relaxation methods
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|a Relaxation methods
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|a Temperature distribution
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|a Thermal aging
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|a Thermal insulation
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|a Time domain analysis
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|a Krotowski, A.
|e author
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|a Wolny, S.
|e author
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| 773 |
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|t Energies
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