Compatible Transformer Winding Configurations (Vector Groups)
Compatible Transformer Winding Configurations (Vector Groups)
Sunny Tripower and Sunny Highpower inverters require connection to a grounded Wye transformer winding. A neutral conductor connection is not required between the inverter and the transformer's grounded neutral point.
The phase shift of transformers does not affect the operation of Sunny Tripower and Sunny Highpower inverters. Transformers with compatible winding configurations can be specified with any available phase shift.
Compatible Transformer Winding Configurations1) at Inverter ECP | Inverter type | ||
|---|---|---|---|
YNyn grounded neutral point: grounded neutral point | Dyn delta: grounded neutral point | YNd grounded neutral point: delta | |
Yes | Yes | No | STP 12-50 / STP 15-50 / STP 20-50 / STP 25-50 |
Yes | Yes | No | STP 50-80 / STP 60-80 |
Yes | Yes | No | STP 125-70 |
Yes | Yes | No | SHP 100-21 |
1) The second part of the transformer’s vector-group notation gives the inverter-side winding configuration. For example, Dyn is a transformer with a delta configuration on the grid connection side and a wye-grounded configuration on the inverter connection side.
Connecting inverters to transformers that do not comply with these guidelines can result in unstable inverter operation, excessive nuisance tripping, and disruption or damage to the inverters or other connected equipment.