AbstraciA new method was developed by Palo Verde Nuclear Generating Slation (PVNGS) electrical design engineering personncl to updatc the plant auxiliary power system loading, voltage regulation, and short circuit calculations. Innovative techniques were used to model all significant circuit elements and switching arrangements of the AC distribution system from the switchyard to the ter"nals of all three-phase load equipment A computer prowas developed in-housc to interpret the network model. retrieve component data from existing databases, and generate comprchcnsive load flow, voltage, and short circuit results. The program provides a means to quickly and easily run "what if' scenarios to analyze any credible plant event. This method has provided plant engineers with a flexible and readily-available tool which has resulted in a bcttcr understanding of the dismbution system performance and a fully auditable, easy to maintain calculation.
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