Publications by Roland Wetter | EPFL Graph Search

A New Inductive Air-Gap Monitoring System for Large Low Speed Hydro-Generators, Tests in Operation

Jean-Jacques Simond, Mai Tu Xuan, Roland Wetter

2008

An innovative Inductive Air-Gap Monitoring System for Large Low Speed Hydro-Generators

Jean-Jacques Simond, Mai Tu Xuan, Roland Wetter

Large low speed hydro-generators (Fig. 1) have a very small specific air-gap to stator bore diameter ratio making it virtually impossible to have a perfect centering of the rotor within the stator during the assembly process. Therefore the machines are ope ...

2008

A Novel Air-Gap Monitoring System For Large Low Speed Hydro-Generators

Jean-Jacques Simond, Mai Tu Xuan, Roland Wetter, Stefan Keller

This paper describes a novel and patented air-gap monitoring system for large low speed synchronous hydro-generators. This new system is based on inductive sensors, it is able to measure in real time a static or a dynamic rotor eccentricity, a stator or a ...

2006

An Original Inductive Air-Gap Monitoring System for Large Low Speed Hydro-Generators

Jean-Jacques Simond, Mai Tu Xuan, Roland Wetter, Stefan Keller

2006

On the Identification of the Synchronous Machine Parameters Using Standstill DC Decay Test

Jean-Jacques Simond, Mai Tu Xuan, Roland Wetter

This paper presents a refined approach to obtain the parameters of synchronous machine equivalent circuits from standstill DC decay tests. A dedicated program for the time- constants and reactances identification was developed and applied for both d- and q ...

2006

12-Pulse LCI Synchronous Drive for a 20 MW Compressor - Modeling, Simulation and Measurements

Alain Sapin, Jean-Jacques Simond, Mai Tu Xuan, Roland Wetter

The current source thyristor inverter is still today a suitable choice for supplying high power adjustable speed drives for pumps or compressors. This paper presents a 12-pulse LCI (load commutated inverter) synchronous drive for a 20 MW compressor, it foc ...

2005

20 MW Compressor LCI Drive: Modeling, Simulation and Measurements

Alain Sapin, Jean-Jacques Simond, Mai Tu Xuan, Roland Wetter

The LCI (Load commutated Inverter) is still today a suitable solution for supplying high power variable speed drive systems. The following main topics are described in this contribution: The modeling of a 20 MW LCI synchronous drive system for a compressio ...

2002

Investigation of transient overvoltages of low voltage induction motors due to IGBT-Inverter supply

Basile Kawkabani, Jean-Jacques Simond, Roland Wetter

The present paper investigates transient overvoltages on ac induction motors when connected through a cable of arbitrary length to IGBT-PWM inverters. Considering classical transmission line analysis, and traveling-wave analysis with zero initial charges o ...

2000