Analytical and Numerical Calculation of Sub-Conductor Circulationg Currents in Roebel Bars of Hydro Generators

authored by

Torben Fricke, Alexander Rehfeldt, Babette Schwarz, Eva Bresemann, Bernd Ponick

Abstract

This paper investigates the prediction of sub-conductor circulating currents in hydro generators. First, an analytical field calculation approach, based on Biot-Savart law and Schwarz-Christoffel mappings is presented. Different field effects of both the stator and rotor are investigated and discussed. The analytical method also covers the calculation of the impedance matrix for a Roebel bar including effects inside the stator core. Finally, sub-conductor circulating currents are calculated based on the field calculation and the impedance matrix. The analytically calculated field and sub-conductor currents are compared to FE simulation results of a generator. One of the Roebel bars is modelled in detail inside the core as well as in the end region, including twelve twisted sub-conductors.

Organisation(s)

Institute of Drive Systems and Power Electronics

External Organisation(s)

Voith GmbH & Co. KGaA
Baker Hughes INTEQ

Type

Conference contribution

Pages

1074-1079

No. of pages

6

Publication date

24.10.2018

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Energy Engineering and Power Technology, Electrical and Electronic Engineering, Mechanical Engineering

Sustainable Development Goals

SDG 7 - Affordable and Clean Energy

Electronic version(s)

https://doi.org/10.1109/icelmach.2018.8506880 (Access: Closed)