| Essential Question | Level of Thinking |
| What are the voltage and current relationships of wye-delta, wye-wye, delta-wye, and delta delta transformers? | |
| What are the steady-state responses of the four transformer types to unbalanced loads, ground faults, and common mode currents? | |
| What are the implications of using an ungrounded vs solidly grounded system on the secondary of the low voltage distribution transformer? | |
| How are single phase 120 V and 240 V loads supplied via distribution transformers? | |
Experiment 1: Delta-Delta Transformer – Balanced Operation – ungrounded
Experiment 2: Delta-Delta Transformer – ungrounded system – Ground Fault
Experiment 3: Delta-Delta Transformer – ungrounded system – unbalanced load
Experiment 4: Wye-Delta Transformer – ungrounded system – unbalanced load
Experiment 5: Delta-Wye Transformer – ungrounded system – unbalanced load
Experiment 6: Delta-Wye Transformer – 4 wire – ungrounded system – unbalanced load
Experiment 7: Delta-Wye Transformer – 4 wire – ungrounded system – ground fault
Experiment 9: Delta-Wye Transformer – 4 wire – HRG system – unbalanced load and ground fault
IEEE Std 45.1 IEEE Recommended Practice for Electrical Installations on Shipboard--Design
Mukund Patel, Shipboard Electrical Power Systems,CRC Press, Roca Raton 2021
Doerry, Norbert, "Shipboard Three-Phase Power Transformer Analysis," Version 1.0, December 10, 2022
(C) Copyright 2024 Norbert Doerry
This work by Norbert Doerry is licensed under CC BY 4.0