Generator monitoring apparatus
US4082948A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1977 |
| Grant date | Apr 4, 1978 |
| Priority date | — |
| Expiry date | Apr 1, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/34
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Certain internal parts of a gas cooled dynamoelectric machine may be coated with selected materials which will decompose at elevated temperatures to give off sub-micron particles into the machine gas coolant called pyrolysates. The presence of such pyrolysates in the machine gas coolant is indicative of localized overheating within the dynamoelectric machine. A detector is known for sensing the occurrence of these pyrolysates and hence a monitoring system has been devised for giving an early warning of machine overheating. Occasionally, oil mist particles from the machine may become entrained in the machine gas coolant and cause a false overheating signal from the detector. A second detector has been devised which may be used in combination with the first detector to provide a redundant monitoring system which will provide immediate validation of the presence of pyrolysate particles and which monitoring system is testable on line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.