| abstract |
In a gas-cooled dynamoelectric machine, some machine parts contain, or are coated with, organic materials; which, upon the occurrence of localized overheating, undergo thermal decomposition and emit submicron particles into the gas coolant. An ion chamber detector has been devised for sensing the presence of these products of thermal decomposition in the gas coolant. Moreover, different organic materials produce different products of thermal decomposition which have different identifiable characteristics. If different parts of a dynamoelectric machine contain, or are coated with, different organic materials, the products of thermal decomposition may be analyzed to determine the particular localized overheating area. A sampling device for collecting these products of thermal decomposition is described herein, along with its application to a dynamoelectric machine having an ion chamber detector included therewith. |