TY - JOUR

T1 - Method for the Prediction of the Potential Distribution in Electrical Machine Windings Under Pulse Voltage Stress

AU - Hoffmann, Alexander

AU - Ponick, Bernd

N1 - Funding Information: Manuscript received April 23, 2020; revised July 30, 2020; accepted September 8, 2020. Date of publication September 24, 2020; date of current version May 21, 2021. This work was supported by the German Federal Ministry of Economic Affairs and Energy on the basis of a decision by the German Bundestag. (Corresponding author: Alexander Hoffmann.) The authors are with the Institute for Drive Systems and Power Electronics, Leibniz Universität Hannover, 30167 Hannover, Niedersachsen, Germany (e-mail: alexander.hoffmann@ial.uni-hannover.de; ponick@ial.uni-hannover.de).

PY - 2021/9/24

Y1 - 2021/9/24

N2 - This article provides an applicable method to predict the distribution of the electric potential inside the winding of an electrical machine with a reasonable set of parameters. It extends the understanding of the winding impedance in terms of the inter-winding behavior and gives us the opportunity to properly design the insulation system during the development phase of an electrical machine. Predictions are backed up by measurements and an in-depth look at the measurement setup. The results proof nonuniform potential distribution and show that the potential difference between individual turns exceeds the amplitude of the phase voltage. Our findings also establish an interrelation between the winding impedance and the potential oscillations inside the winding. The article provides an introduction to the fundamental process of voltage stress on electrical machine windings and discusses drivers for upcoming challenges in the field of winding insulation and partial discharges.

AB - This article provides an applicable method to predict the distribution of the electric potential inside the winding of an electrical machine with a reasonable set of parameters. It extends the understanding of the winding impedance in terms of the inter-winding behavior and gives us the opportunity to properly design the insulation system during the development phase of an electrical machine. Predictions are backed up by measurements and an in-depth look at the measurement setup. The results proof nonuniform potential distribution and show that the potential difference between individual turns exceeds the amplitude of the phase voltage. Our findings also establish an interrelation between the winding impedance and the potential oscillations inside the winding. The article provides an introduction to the fundamental process of voltage stress on electrical machine windings and discusses drivers for upcoming challenges in the field of winding insulation and partial discharges.

KW - Windings

KW - Electric potential

KW - Capacitance

KW - Stator windings

KW - Insulation

KW - Stress

KW - AC machines

KW - partial discharge

KW - potential distribution

KW - random-wound winding

KW - turn-to-turn voltage

UR - http://www.scopus.com/inward/record.url?scp=85107000904&partnerID=8YFLogxK

U2 - 10.1109/TEC.2020.3026531

DO - 10.1109/TEC.2020.3026531

M3 - Article

VL - 36

SP - 1180

EP - 1187

JO - IEEE Transactions on Energy Conversion

JF - IEEE Transactions on Energy Conversion

SN - 0885-8969

IS - 2

M1 - 9205633

ER -