Radiofrequency Monitoring of Turbine Generators.
Abstract
The purpose of this dissertation is to present the results of a research program designed to obtain an increased understanding of radio frequency arc detection in large turbine generators. Prior work led to the development of an on-line fixed frequency arc monitor for application on large turbine-generators. Long term experience with the monitor has shown that it is possible for a certain type of stator winding arcing condition to occur and not be detected. In one documented generor stator failure, where evidence of excessive arcing in the stator had occurred, the fixed frequency RF monitor failed to give an indication. To determine why the RF monitor did not respond, a study was done to obtain a better understanding of the propagation of RF currents through a generator stator winding. The study consisted of a series of RF measurements made in conjunction with a computer circuit analysis of a large turbine generator stator winding. The measured and calculated response of the generator are in good agreement resulting in a good understanding of RF signal propagation in a stator winding. Based on the results of the study, an improved method of RF arc detection was developed which involves the measurement of the generator's neutral circuit RF voltage over the frequency range from 3.0 MHz to 7.0 MHz.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1983
- Bibcode:
- 1983PhDT.........9E
- Keywords:
-
- Physics: Electricity and Magnetism;
- Monitors;
- Radio Frequencies;
- Turbogenerators;
- Arc Discharges;
- Stators;
- Wire Winding;
- Electronics and Electrical Engineering