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- W2517871554 abstract "Synchronous turbine generators are now fully capable of continuous operation at Class F temperature levels. For the first 70 years of existence of the ac generator. the thermal capabilities of organic insulation systems, composed of paper, varnishes, and enamels, dictated the capability that could be obtained from synchronous generators. These Class A insulation systems were capable of long life with a hot-spot temperature of 105 C. Developments in the fifties and sixties led to the adoption of superior Class B insulation systems, which were capable of sustaining satisfactory life at a hot-spot temperature of 130 C. The benefits of the change, in the form of higher efficiency and smaller generator became obvious to most generator purchasers and the transition was completed in the sixties. It has become popular for customers to specify a Class F insulation system with Class B operating temperature. There has been continued progress over the last three decades in the development of insulation systems and in the design of turbine-generators for elevated temperature operation. In particular, ANSI Standard C50.14, which addresses combustion-turbine generators, has long limited peaking operation to Class F hot-spot temperatures (155 C) for machines normally base operated as Class B. Most turbine-generators aremore » presently purchased for Class B steady-state operation with a Class F insulation system. In fact, it is now possible (and recommended) to operate selected machines with Class F operating temperatures. This paper will outline some of the practices employed by a major manufacturer of turbine-generators to provide adequate performance at Class F operating temperatures and provide a discussion of the benefits of Class F operation.« less" @default.
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- W2517871554 date "1998-12-31" @default.
- W2517871554 modified "2023-09-26" @default.
- W2517871554 title "Superior turbine generator performance through higher temperature operation" @default.
- W2517871554 hasPublicationYear "1998" @default.
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