My question concerns interconnecting inverter-based distributed energy resources through delta / wye-ground transformers, where the delta side is towards the utility and the wye-ground side is towards the DG. I have often seen objections to this configuration on the theory that an open phase on the primary won't be detected on the secondary without primary-side relaying. I have read some of the GE and SEL papers on high side open phase detection but they seem more focused on traditional generation/load. Is anyone aware of any literature discussing how wye-ground connected, voltage-controlled current source inverters actually react to an open phase on a high-side delta?
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Open phasing of a D-yg transformer with inverter generation
- Thread starter mb3928
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It will be undervoltage on 2 phases on low side...if delta side is missing phase....generator will shut down...it depends from where phase is missing and relation between source power..and generator power by theory...but practically....generator will shut down!
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