Endurance of Polymeric Insulation Foil Exposed to DC-Biased Medium-Frequency Rectangular Pulse Voltage Stress

Raphael Färber, Thomas Guillod, Florian Krismer, Johann W. Kolar and Christian M. Franck
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Raphael Färber: High Voltage Laboratory (HVL), Department of Information Technology and Electrical Engineering, ETH Zürich, 8092 Zürich, Switzerland
Thomas Guillod: Power Electronic Systems Laboratory (PES), Department of Information Technology and Electrical Engineering, ETH Zürich, 8092 Zürich, Switzerland
Florian Krismer: Power Electronic Systems Laboratory (PES), Department of Information Technology and Electrical Engineering, ETH Zürich, 8092 Zürich, Switzerland
Johann W. Kolar: Power Electronic Systems Laboratory (PES), Department of Information Technology and Electrical Engineering, ETH Zürich, 8092 Zürich, Switzerland
Christian M. Franck: High Voltage Laboratory (HVL), Department of Information Technology and Electrical Engineering, ETH Zürich, 8092 Zürich, Switzerland

Energies, 2019, vol. 13, issue 1, 1-17

Abstract: The endurance of polymeric insulation foil is investigated under a mixed medium-voltage stress (DC + medium-frequency rectangular pulse) by means of accelerated lifetime testing. A dedicated setup is used that allows us to selectively eliminate the known risk factors for premature insulation failure under medium-frequency pulse voltage stress: partial discharges (PDs) during pulse transitions, excessive dielectric heating, and systemic overvoltages. The obtained results on polyethylenterephtalat (PET) insulation foil suggest that the adequate consideration of these factors is sufficient for eliminating the adverse effects of the pulse modulation under the investigated conditions. Indeed, if all mentioned risk factors are eliminated, the time to failure observed under a pure DC stress is shorter than with a superimposed pulse (keeping the same peak voltage). There is then no indication of an additional detrimental “per pulse” degradation process (i.e., the time to failure is not dependent on pulse frequency). In contrast, when repetitive PDs are present, the lifetime under combined DC + rectangular pulse stress strongly decreases with increasing pulse switching frequency. PD erosion of the foil is quantified by means of confocal microscopy, and the applicability of the streamer criterion for predicting PD inception is discussed.

Keywords: dry-type insulation; aging; time to failure; partial discharge; power electronics; inverter; converter; medium-frequency; pulse-width-modulated (PWM); electromechanical stress (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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