Parallel Transformers

Load sharing and parallel-operation checks for two transformers.

Inputs

Transformer 1 rating S₁ kVA

Transformer 1 uₖ %

Transformer 2 rating S₂ kVA

Transformer 2 uₖ %

Total load S kVA

Power factor —

Voltage-ratio difference %

Note — Load sharing is impedance-proportional; identical voltage ratio, vector group, phase sequence and u_k within 10% are required (IEC 60076).