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Transformer Parallel Load Sharing Calculator — kVA & Impedance

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Transformer A rating (kVA) Nameplate apparent-power rating.Transformer A impedance (%) Use nameplate/factory-test percent impedance.Transformer B rating (kVA) Nameplate apparent-power rating.Transformer B impedance (%) Use nameplate/factory-test percent impedance.Total parallel-bank load (kVA) Total apparent power supplied to the common load bus.

Calculated result

A 797.55 kVA · B 502.45 kVA

Transformer A loading: 79.75%

Transformer B loading: 79.75%

Combined nameplate capacity: 1,630 kVA

Bank loading by nameplate sum: 79.75%

Maximum total load before Transformer A reaches 100%: 1,630 kVA

Show the working

1. Admittance weight A = kVA/Z% = 1,000 ÷ 6 = 166.667.
2. Admittance weight B = kVA/Z% = 630 ÷ 6 = 105.
3. A share = 1,300 × 166.667 ÷ (166.667 + 105) = 797.55 kVA.
4. B share = 1,300 − 797.55 = 502.45 kVA.
5. Loading = assigned kVA ÷ nameplate kVA × 100 → A 79.75%, B 79.75%.

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