Details

Title

Eddy current density asymmetric distributionof damper bars in bulb tubular turbine generator

Journal title

Archives of Electrical Engineering

Yearbook

2017

Numer

No 3 September

Publication authors

Keywords

damper bars ; bulb tubular turbine generator ; electromagnetic field ; eddy current

Divisions of PAS

Nauki Techniczne

Description

The major reasons that cause the damage of damper bars in the leeward side are found in this paper. It provides a route for the structure optimization design of a hydro generator. Firstly, capacity of a 24 MW bulb tubular turbine generator is taken as an example in this paper. The transient electromagnetic field model is established, and the correctness of the model is verified by the comparison of experimental results and simulation data. Secondly, when the generator is operated at rated condition, the eddy current density distributions of damper bars are studied. And the asymmetric phenomenon of the eddy current density on damper bars is discovered. The change laws of the eddy currents in damper bars are determined through further analysis. Thirdly, through the study of eddy current distributions under different conditions, it is confirmed that the stator slots and armature reaction are the main factors to affect the asymmetric distribution of the eddy current in damper bars. Finally, the studies of the magnetic density distribution and theoretical analysis revealed the asymmetric distribution mechanism of eddy current density.

Publisher

Polish Academy of Sciences

Date

21-09-2017

Identifier

eISSN: 2300-2506 ; ISSN: 1427-4221

DOI

10.1515/aee-2017-0043

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