If you have a grounding resistor, you can't connect the 'grounded' conductor to anything else. The primary wye will not 'as the grounding resistor will 'anchor' it. Wye/wye transformers are not used:
Originally Posted by diakonos1984
- Triplen harmonics can pass through the transformer. This will cause problems with interference.
- Relay coordination/selectivity becomes more difficult. As the zero sequence current goes right through the transformer, the ground fault on the secondary appears as ground fault on the primary.
- Utility ditribution uses wye-wye transformers see cost benefits of lower initial capital investment. They also are concerned about the potential ferro-resonance that would appear if one phase is lost on the primary. In industry or commercial applications this would not be a major concern.
Laszlo Z Weress
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