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2.2.8 AuxiliaryLosses These auxiliary losses can include drivetrain losses, plus the power required to support the mechanical and controls operation of the gas turbine package, the power required to operate a generator, plus transformer losses, as applicable. The majority of the auxiliary losses are the result of electric motors driving pumps and fans. Manufacturers and packagers are generally able to provide the actual running auxiliary losses in kW, even though the sum total of all motor ratings in the package may seem to be much higher. This is because most motors will be selected to a higher frame size, thus not drawing full power, and many applications may be 2 x 100%, where only one of two motors actually operates. With reference to the attached sketch SK01 - Typical Power Plant Single Line Diagram with Auxiliary Losses, some typical auxiliary losses include: a) Lubricating Oil Pumps - Every gas turbine generator package has at least one lubricating oil system supplying pressurized oil to the gas turbine bearings and possibly control systems. In some cases, this oil system will also supply oil to the driven gearbox, generator and/or compressor, and in some cases, a separate oil system will do this additional duty. If the oil system pumps are shaft-driven off the gas turbine, the gearbox and/or the generator shaft, then the manufacturer will usually automatically deduct the power consumption used to drive them from the generator power available. If instead the oil pumps are continuously driven by electric motors, then the motor power is a parasitic loss, which will have to be deducted from the gross power output of the generator. If the electric-motor driven pump is used only during start-up or shutdown or in the case of an emergency, it is not a continuous load and need not be included in the continuous parasitic losses. b) Ventilation Fans - A gas turbine generator enclosure typically has a forced air cooling and ventilation system with fans moving the required mass of air. Typically, ventilation systems are 2 x 100% duty, with a normal system and a back-up system. When the electrical generator is also air cooled, it too will require ventilation air and this requirement will have no effect on the parasitic load UNLESS there is a separate requirement for motor driven fans to augment the air flow provided by the fans on generator rotor. UNDERSTANDING GAS TURBINE PERFORMANCE © Gryphon International Engineering Services Inc. St. Catharines, Ontario, Canada GTPerf_0900 Page 13PDF Image | UNDERSTANDING GAS TURBINE PERFORMANCE
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