IEEE Std 666-1991, IEEE Design Guide for Electric Power by American National Standards Institute, Ieee Power

By American National Standards Institute, Ieee Power Engineering Society

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Additional info for IEEE Std 666-1991, IEEE Design Guide for Electric Power Service Systems for Generating Stations

Sample text

The difference in tolerance can have a signiÞcant effect on the preliminary design phase of the auxiliaries power systems. In the preliminary design, the exact impedance of the auxiliaries transformer is initially unknown. In order to calculate the transformer impedance, the manufacturerÕs impedance tolerance is appropriately taken into account for shortcircuit and voltage regulation calculations. 5% in impedance tolerance may be critical under certain design conditions and may warrant a change.

When the largest load is a motor driving high-inertia loads, such as an induced-draft fan, the starting transient duration may be up to 60 s. Voltage proÞles during such transients are not required to satisfy criteria established for continuous operation or short-time overload, but they must be adequate to assure that no running motor 28 Copyright © 1993 IEEE All Rights Reserved SYSTEMS FOR GENERATING STATIONS IEEE Std 666-1991 will stall and no motor-starter contactor will drop out. Acceptable equipment operating voltage ranges should be conÞrmed with the manufacturer.

For maximum short-circuit contribution from the transmission system, the maximum transmission system voltage and minimum transmission system impedance are used. The SST is the only component that can be changed to limit the fault contribution from the transmission system. Therefore, for a given station service load, transformer tap setting, system voltage, system short-circuit impedance, and auxiliaries bus short-circuit rating, the required transformer impedance(s) can be determined. 1. 3 Phase Sequence and Phase Angle Difference For three-phase power systems, phase sequence identiÞes the order in which the three voltages reach their positive maximum values relative to a Þxed reference point.

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