Research - TopicsThe purpose of the research carried out in the “Electrical measurements and instrumentation” laboratory of the Department of Electrical Engineering and Computer Science is to apply and to develop sensitive measurement techniques in order to characterize the electrical, thermal, and magnetic properties of various materials.
- Electrical measurements :
- resistivity, Hall effect, current- voltage relationships, R-L-C characteristics,... on conductor materials, superconducting (bulk or tape) and magnetoresistive ceramics, measurements on dielectric materials,
- Magnetic measurements :
- DC magnetisation, magnetic permeability, AC susceptibility, Hall probe mapping, magneto-optical imaging, magnetic shielding, influence of "crossed" magnetic fields, superconducting levitation force,
- Thermal measurements :
The final objectives are thus the elucidation of the physical mechanisms involved in the materials, combined with a co-ordinated research effort looking into their use in engineering applications, such as sensors, rotating machines and flywheels.
The studied subjects are the following :
- Study of non-linear potential grading materials used for reducing the partial discharges on end-windings.
- Electrical characterisation of so-called "semi-conducting" varnishes.
- Transient study of charge - discharge currents through the mica-resin insulation.
- Partial discharge measurements under influence of vibrations.
- Expertise in low current measurements.
- Electrical characterisation of ceramic insulating composites and polymer materials.
on insulation and surface varnishes
|Probe of an electrostatic voltmeter for surface potential mapping on stator bars|
|Stator end-windings :
damage caused by electrical discharges
on the anticorona varnish