Abstract:
It is a widely recognised fact that the presence of Partial Discharge activity in machines
with an operating voltage exceeding 6,6 kV, enables periodic on-line monitoring of the
condition of these machines. Analysis of the discharge activity, can assist maintenance
personnel in determining if a winding has become loose, contaminated or if the
insulation condition is deteriorating.
However, very little information exists regarding PD activity in machines with an
operating voltage of 3,3 kV. Although some studies have been conducted, that dealt
with measurement techniques and continuous on-line monitoring of 3,3kV machines,
very few investigated the discharge levels or failure mechanisms associated with
different types of machines.
Due to the large amount of critical 3,3 kV machines at Iscor Flat Steel Products, it was
deemed necessary to investigate the possibility of applying the same techniques to these
machines, in order to determine the condition of the windings.
Tests and analysis conducted with a PD Analyser and software manufactured by Iris
Power Engineering, indicated that it would be feasible to perform on-line testing of
certain 3,3 kV motors.
