Title :
Routine diagnostic measurements of high-voltage machines
Author :
Wolmarans, A.D.W. ; Geldenhuys, H.J.
Author_Institution :
Tettex Instruments SA, Ltd., Randburg, South Africa
Abstract :
Describes a program of regular diagnostic measurements on the stator insulation of in-service high-voltage rotating machines. The results of 2639 measurements (over a period of 20 years) on 3.3 kV, 6.6 kV, and 11 kV machines have been accumulated in a database. Statistical analysis of typical insulation parameters, e.g., tan (δ), distributions provide reference values against which future measurement results can be evaluated. The insulation condition is assessed by normalizing and combining the measurement results to obtain a merit mark for the machine stator insulation. Repeated measurements on machines show clear trends in deteriorating merit mark with increase in insulation age. It is concluded that the diagnostic measurements and the merit mark system can, in the hands of the experienced test engineer, serve as a useful decision aid in alerting the operator of the machine to a potentially fatal deterioration of the stator insulation condition
Keywords :
insulation testing; machine insulation; stators; 3.3 to 11 kV; diagnostic measurements; high-voltage rotating machines; insulation condition; insulation parameters; loss angle; merit mark system; stator insulation; Africa; Capacitance measurement; Dielectric loss measurement; Dielectric measurements; Insulation testing; Loss measurement; Rotating machines; Rotation measurement; Stators; Voltage;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1991., Proceedings of the 3rd International Conference on
Conference_Location :
Tokyo
Print_ISBN :
0-87942-568-7
DOI :
10.1109/ICPADM.1991.172182
