Title :
On-line detection of overheating material in turbine generators using chemical analysis
Author :
Sorita, T. ; Minimi, S. ; Fujimoto, T. ; Takashima, M. ; Nakamura, K.
Author_Institution :
Adv. Technol. R&D Center, Mitsubishi Electr. Corp., Hyogo, Japan
Abstract :
A novel on-line monitoring method for the early detection of overheating in turbine generators has been developed. This paper deals with the gas sampling procedure, the gas-phase concentration changes of the organic species in the turbine generator, and theoretical discussion about overheating-detection. The concentration of the gas-phase organic species in an operating generator has been monitored over a period of 1 year. The results revealed that the background concentration increased for about 100 days at the beginning of the operation and then slowly decreased. Bisphenol-A and some molecules were recognized as characteristic decomposition indicators from epoxy. It was theoretically predicted that the slope of rapid concentration increase is corresponding to the overheating temperature and the volume. Detecting the overheating problem is considered feasible by tracing relative concentration gradient of the decomposition species from the materials
Keywords :
organic insulating materials; thermal stability; turbogenerators; background concentration; bisphenol-A; chemical analysis; decomposition indicators; epoxy; gas sampling procedure; gas-phase concentration changes; on-line detection; overheating material; turbine generator; turbine generators; Chemical analysis; Chemical technology; Coolants; Gases; Hydraulic turbines; Hydrogen; Monitoring; Partial discharge measurement; Sampling methods; Temperature;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1999 Annual Report Conference on
Conference_Location :
Austin, TX
Print_ISBN :
0-7803-5414-1
DOI :
10.1109/CEIDP.1999.807860
