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Using the IEEE Comprehensive Test Feeder W. H. Kersting

Using the IEEE Comprehensive Test Feeder W. H. Kersting. Purpose of the Test Feeder. Requires Modeling of all possible Overhead lines Underground lines Voltage regulator connections Transformer connections Induction machines Secondary systems

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Using the IEEE Comprehensive Test Feeder W. H. Kersting

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  1. Using the IEEE Comprehensive Test FeederW. H. Kersting

  2. Purpose of the Test Feeder • Requires Modeling of all possible • Overhead lines • Underground lines • Voltage regulator connections • Transformer connections • Induction machines • Secondary systems • Provides a teaching tool for the new distribution engineer

  3. Overhead Lines • Three-phase 4 wire • Three-phase 3 wire • Two-phase 3 wire • Two-phase 2 wire • Single-phase 2 wire • Single-phase triplex • Three-phase quadraplex • Parallel lines

  4. Underground Cable Lines • Three 1/3 concentric neutral cables + 1 ground wire • Three 1/3 concentric neutral cables • Two concentric neutral cables with full neutrals • Two tape shielded cables + 1 ground wire • One full concentric neutral cable

  5. Transformer Connections • Three-phase with and without center tap • Grd. Y – Grd Y • Grd. Y – D • Ungrd. Y – D • D – Grd. Y • Open Y – D • Open D – D • Single-phase with and without center tap • Grd. Y – D • D – Grd. Y (no center tap) • D - D

  6. Step Voltage Regulators • Three single-phase connected • Y – Y • D – D • Two single-phase connected: • Open D – Open D • One single-phase connected Grd. Y

  7. Induction Machines • Three-phase generator with specified kW • Three-phase motor with specified slip • Three-phase motor with specified kW • Three-phase motor with specified kW and power factor

  8. Loads • Spot and Distributed (ZIP Loads) • Y with specified kW and kvar • Y with specified Z • Y with specified current • D – with specified kW and kavr • D – with specified Z • D – with specified current

  9. Parallel Lines • Overhead on common pole • Common sending end node • Separate receiving end nodes • Underground cables • In common trench • Common sending end node • Receiving end • Common • Or separate

  10. Voltage Regulation • All customer voltages within ANSI standard of between 126 and 114 volts • Voltage regulator settings • Voltage level – desired voltage at the load center • Compensator R and X settings – equivalent impedance between regulator and the load center • Bandwidth –

  11. Substation Regulator • Three single-phase connected Y – Y • Load center node 717 • Voltage level = 123 volts • R + jX = 4.7 + j3.4 volts • Bandwidth = 2 volts • Load center(node 717) voltages = 121.9, 122.5 and 121.6 • Final taps = +12, +10 and + 12

  12. Node 735 voltages = 115.1, 117.4 and 114.0 Low Voltages

  13. How To Correct Low Voltages • Shunt capacitors at node 731 • 900 kvar three-phase • Voltages still low • New voltage regulator at node 717 • CT primary ratio = 200 • PT ratio = 120 • Load center = node 735 • Voltage level = 122 volts

  14. Compensator R & X Settings • Node voltages and line currents

  15. Compensator R&X Settings

  16. Results

  17. Center Tap Transformer with Secondary and Loads

  18. Single-Phase Center Tap with Secondary System

  19. Reg – 4 Settings • Voltage Level = 125 • R = 1.3 volts • X = 0.5 volts • Bandwidth = 2 volts

  20. With Reg-4

  21. Quadraplex Secondary System

  22. Quadraplex Secondary System

  23. Transformer Connections • Grounded Y-D Open Y - D • Ungrounded Y -D

  24. Parallel UG and OH System

  25. UG Parallel Cable Lines

  26. UG Current Flows • With SW-3 closed • With SW-3 Open

  27. OH Parallel Lines

  28. Induction Generator Sub-System

  29. Induction Generator Studies • Transformer T9 Connections • Delta-Delta • Ungrounded Wye – Delta • Grounded Wye – Delta • Generator – Delta Connected • On – Supplying 150 kW to the system • Off

  30. Delta – Delta Connection • Generator On: • Generator Off:

  31. Ungrounded Wye - Delta • Generator On: • Generator Off:

  32. Grounded Wye - Delta • Generator On: • Generator Off:

  33. Why the Primary No Load Current?

  34. IEEE Test Feeders Web Site • http://ewh.ieee.org/soc/pes/dsacom/testfeeders/index.html

  35. Summary • IEEE Comprehensive Feeder Studied • Can be used to teach new engineers how the feeder operation changes with changes in the various devices • Good for “what if” questions • The IEEE Test Feeder Task Force hopes the system will be used not only by new engineers but by program developers to confirm results

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