Transformer current and kVA workflow
How to prepare transformer kVA, voltage and phase inputs before using the Australian transformer current calculator.
Transformer-current purpose
Transformer current calculations connect kVA, voltage and phase. They are useful when checking primary current, secondary current or a missing kVA relationship, but they do not decide transformer selection by themselves.
The record should show which side of the transformer is being reviewed.
Workflow
- Identify whether the question is primary current, secondary current or kVA.
- Record transformer kVA and voltage ratings from the source available.
- Keep primary voltage and secondary voltage fields separate.
- Use the transformer current and kVA calculator for the relationship value.
- Carry the result into load, protection or sizing records with the transformer source attached.
Transformer record
| Field | Record | Review concern |
|---|---|---|
| Transformer kVA | Nameplate, specification or design assumption | Drives current calculation |
| Primary voltage | Entered voltage for primary side | Must match the reviewed side |
| Secondary voltage | Entered voltage for secondary side | Must match load or switchboard context |
| Phase | Single-phase or three-phase | Formula path changes |
| Current output | Primary or secondary A value | Not a transformer selection on its own |
Boundaries
- Do not mix primary and secondary voltage bases.
- Do not use current alone to approve transformer size.
- Do not ignore impedance, fault level, cooling, duty or utility requirements.
- Do not copy transformer data between projects without naming the source.