Motor AccelerationMotor Acceleration Comparison Case #1Comparison of ETAP Motor Acceleration with Torque Control Against Hand Calculated ResultsMotor Acceleration Comparison Case #2Comparison of ETAP Motor Acceleration Results Against Transient StabilityUnbalanced Load FlowUnbalanced Load Flow Comparison Case #1Comparison of ETAP Unbalanced Load Flow Results against a Published IEEE 13-Bus Feeder SystemHarmonicsHarmonic Analysis Comparison Case #1Comparison of ETAP Harmonic Analysis Results Against IEEE ExampleTransient StabilityTransient Stability Comparison Case #1Comparison with Field Measurement Data for Generator Start-Up ConditionTransient Stability Comparison Case #2Comparison with I.E.E. Japan (IEEJ) Electrical Power System Standard BenchmarkTransient Stability Comparison Case #3Comparison with Field Measurements from a Digital Fault RecorderTransient Stability Comparison Case #4Comparison with 9-Bus Multi-Machine System BenchmarkTransient Stability Comparison Case #5Comparison with PTI PSS/E Simulation ResultsCopyright © 2005 Operation Technology, Inc. All Rights Reserved. Page 3 of 66No part of this documentation may be reproduced or transmitted without prior written permission of OTI. For information on obtaining permissions, contact info@etap.com. The Licenseemay copy portions of this documentation for their exclusive use, as long as all reproductions include the OTI copyright notice. Copies shall not be distributed to other persons or entities,including translating into another language. Certain names and/or logos in this document may constitute trademarks, service marks, or trade names of OTI or other entities.

ETAP Load FlowThe ETAP V&V process for the Load Flow program has over 1500 test case scenarios that are run before eachETAP release. The following case samples are from the Load Flow Solutions & Methods category.

Load Flow Comparison Case # 1Comparison of ETAP Load Flow Results against a Published Textbook ExampleExcerpts from Validation Cases and Comparison Results (TCS-LF-006)Highlights• Comparison between ETAP Load Flow (LF) results against those published in the textbook “ComputerAided Power System Operation and Analysis” by R.N Dhar, page 89.• Comparison of results for the Newton Rhapson Method.• Comparison of results for the Accelerated Gauss Seidel Method.• Comparison of results for the Fast Decoupled Method.• Study includes generation, motor loads, transformers and cables.• Considers line impedance and admittance.• Comparisons are made against generation schedule, bus voltages and power flows in per-unit.• The difference in the results is less than 1% for all bus voltages and power flows.System DescriptionThis is a six-bus system that is composed of lines, cables, transformers, generators and utility. The lineimpedance and charging effects are considered. The schedule of generation and loading for each bus were takenas described in Table 6.2 of the published example.