Fast transfer test of power station auxiliaries
There has been much work done concerning the analytical and theoretical analysis of bus transfers, most of this pertaining to the induction motor during transients; however, very little has been published presenting experimental data of such a transfer. In this paper data is presented which was taken during and after a bus transfer on a 450 MW fossil fired unit. The data shows the validity of the models, but also indicates that the synchronous motor is more of a concern than previously thought.
A Simplified Procedure for Determining the Auxiliary Bus Voltage and Angle During Bus Transfer
During a power station auxiliary bus transfer the bus residual voltage and angle relative to the reserve bus voltage are critical for the first .5 second. A procedure is presented that determines the auxiliary bus voltage during the critical period of the bus transfer. For this simplified procedure a gas fired steam turbine generator auxiliary system is the test case used. The procedure is equally applicable to a nuclear steam turbine generator auxiliary system. The effect of residual motor current is reviewed. Motor speed may also be determined with reasonable accuracy.
Electric Drives for Steam-Electric Generating-Station Auxiliaries
For several years there has been an increasing trend toward all-electric drives for steam-station auxiliaries on account of the recognized advantages in flexibility, convenience, low operating cost, and comparable investment cost. Substantial economies in first cost also have been obtained along with further improvements in flexibility through the use of transformers as the sole means of station power supply. Gratifying reliability of performance has been achieved by co-ordinating design, backed by extensive tests, including momentary interruptions of station power supply, and has been incorporated in approximately 500,000 kw of modern plants of the 850-pound 900-degrees-Fahrenheit powdered-fuel-fired unit type. Operating experience has demonstrated the over-all reliability and economy of all-electric drives for station auxiliaries and of the use of transformers as the sole source of station power supply.