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Using the IEEE Comprehensive Test Feeder W. H. Kersting

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Using the IEEE Comprehensive Test Feeder W. H. Kersting

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    1. Using the IEEE Comprehensive Test Feeder W. H. Kersting

    2. 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

    4. 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

    5. 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

    6. 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

    7. 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

    8. 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 Induction Machines

    9. 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

    10. 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

    11. 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 –

    12. 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

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

    14. 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

    15. Compensator R & X Settings Node voltages and line currents

    16. Compensator R&X Settings

    17. Results

    18. Center Tap Transformer with Secondary and Loads

    19. Single-Phase Center Tap with Secondary System

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

    21. With Reg-4

    22. Quadraplex Secondary System

    23. Quadraplex Secondary System

    24. Transformer Connections Grounded Y-D Open Y - D Ungrounded Y -D

    25. Parallel UG and OH System

    26. UG Parallel Cable Lines

    27. UG Current Flows With SW-3 closed With SW-3 Open

    28. OH Parallel Lines

    29. Induction Generator Sub-System

    30. 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

    31. Delta – Delta Connection Generator On: Generator Off:

    32. Ungrounded Wye - Delta Generator On: Generator Off:

    33. Grounded Wye - Delta Generator On: Generator Off:

    34. Why the Primary No Load Current?

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

    36. 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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