To help our customers understand proper connections for dual primary and/or dual secondary transformers, we have prepared four transformer wiring diagram examples on a hypothetical dual primary and dual secondary transformer. The key to proper connections is the phasing information.
Series Winding Connections
(Primary)
In this example, we are connecting the two primary windings in series.
- Note phasing dots on primary connection points 2 & 4.
- Jumper connection 2 & 3 (note: connection 2 has a phasing dot, connection 3 does not).
- Connect input to connection points 1 & 4.
Parallel Winding Connections
(Primary)
In this example, we are connecting the two primary windings in parallel.
- Note phasing dots on primary connection points 2 & 4.
- Jumper connections 2 & 4 (note: both connections have a phasing dot).
- Jumper connections 1 & 3 (note: both connections have no phasing dot).
- Connect input to connection points 1 & 4.
Series Winding Connections
(Secondary)
In this example, we are connecting the two secondary windings in series.
- Note phasing dots on secondary connection points 5 & 7.
- Jumper connection 6 & 7 (note: connection 7 has a phasing dot, connection 6 does not).
- Output from connection points 5 & 8.
Parallel Winding Connections
(Secondary)
In this example, we are connecting the two secondary windings in parallel.
- Note phasing dots on secondary connection points 5 & 7.
- Jumper connections 5 & 7 (note: both connections have a phasing dot).
- Jumper connections 6 & 8 (note: both connections have no phasing dot).
- Output from connection points 5 & 8.
