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Outward migration of the turn insulations of several poles was observed on every generators in one of Hydro-Québec's power plant and was attributed to thermomechanical stresses. The concern for these rotors is more related to consequences of such degradation and to decide what should be the next course of action considering that the units have been operating for just over thirty years out of 50 years...
The present paper deals with an investigation of thermal characteristics of the rotor of large air-cooled turbo-generators. To model the complex geometry of the rotor cooling system, thermal network method is applied by considering uniform nodes along the rotor body and rotor conductors. Thermal resistances and different losses are considered and consequently by employing iterative solution, temperature...
In this paper, the cooling system of a 200MW air-cooled turbo-generator used in IGCC power station is studied by using multi-physic field analysis under normal operation and insulation aging cases, which will provide theoretical basis for the safety operation of turbo-generator in IGCC power station. Firstly, according to the fluid flow and heat transfer characteristics of multi-path ventilation system...
Electrical machine standards were dominated by the manufacturers until API 541 RP was created in 1972. Up until the mid 1960's, manufacturers constantly re-designed the electrical parts of the machine without user assistance. Critical motors servicing large pipeline pumps were specified with little or no features. All electrical connection points were mounted inside the enclosure and all key mounting...
Dual mechanical port machine (DMP) - a kind of continuous electrical variable transmission, is a very competitive alternative for vulnerable constant speed-ratio mechanical gearbox in high capacity wind power generation system. As the inner rotor is surrounded by the stator and the outer rotor, the DMP machine suffers from PM demagnetization and insulation failure under severe thermal condition. To...
During the design of large air-cooled synchronous machines for hydro power plants special attention must be paid to efficient cooling of the machine. It is necessary that the design engineer gets a complete picture of the losses, the cooling airflow and the temperatures inside the different parts of the machine. Not only the active parts but also the end regions of stator and rotor must be carefully...
Due to ever increasing consumer demand, today's market place is full of portable computing devices such as notebook computers, gaming machines, personal digital assistants (PDA's) and smart phones. In each of these technologies processing power and functionality levels are continuing to increase resulting in increased thermal management issues. The former of these technologies already use an active...
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