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A. Qerkini, M Vogelsberger, C. Zöller, M. Joerg, T. Wolbank:
"Investigation on Parameters Influencing Turn-to-Turn Insulation Stress of Form-Wound Medium-Voltage Induction Machines´,";
in: "IEEE", issued by: IEEE International Conference on Electric Machines and Drives; IEMDC, San Diego / USA, 2019, ISBN: 978-1-5386-9350-6, 192 - 197.

Abstract-In this paper the influence of the voltage step on
the turn-to-turn insulation is investigated when using silicon
carbide (SiC)-MOSFET. As already known, the steep voltage
gradient dv/dt by using of the modern inverter semiconductor
devices leads to additional stress on the stator winding insulation
system, especially the turn-to-turn insulation. The transient
voltage distribution within the stator winding is measured to
determine maximum stress on turn-to-turn insulation.
Changing the values and distribution of the inter-turn
capacitances it is possible to identify the influence of this
parameter on the turn-to-turn insulation stress. Using the
measurement results it is possible to define a maximum
allowable voltage gradient in order to keep the turn-to-turn
insulation within its specified safe operating range.

Keywords-voltage gradient (dv/dt); insulation; SiC - MOSFE

https://publik.tuwien.ac.at/files/publik_286229.pdf