Title :
Development of partial discharge monitor for turbine generators
Author :
Itoh, K. ; Tsurimoto, T. ; Kaneda, Y. ; Kitamura, S. ; Kuroki, S. ; Ohsawa, T. ; Tanaka, H.
Author_Institution :
Mitsubishi Electr. Corp., Hyogo, Japan
Abstract :
A new partial discharge (PD) monitor has been developed. It continuously monitors electrical condition of stator winding insulation of the turbine generators in service. Wires of a resistance temperature detector (RTD) preinstalled between top and bottom coils of a stator slot are used as a RF coupler so that no new device installed inside a generator is required. Electromagnetic noise occurring around the generator is rejected by detection with multiple sensors and signal processing software. Results of in-service measurements show negative load and temperature dependence of PD characteristic. It is expected that the dependence is a symptom of degradation of the insulation system
Keywords :
insulation testing; interference suppression; machine insulation; machine testing; partial discharge measurement; stators; turbogenerators; RF coupler; electromagnetic noise rejection; multiple sensors; partial discharge monitor; resistance temperature detector; signal processing software; stator winding insulation; turbine generator; Coils; Condition monitoring; Detectors; Dielectrics and electrical insulation; Electric resistance; Partial discharges; Stator windings; Temperature sensors; Turbines; Wires;
Conference_Titel :
Electrical Insulating Materials, 1998. Proceedings of 1998 International Symposium on
Conference_Location :
Toyohashi
Print_ISBN :
4-88686-050-8
DOI :
10.1109/ISEIM.1998.741689
