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Webb2- Applicable Procedures For Calculating Power And Distribution Transformer Ratios. Step# 1: Determine the turns ratio. Np/Ns = Ep/Es = a (a: transformer turns ratio) Step# 2: Determine the volts-per-turn ratios. volts-per-turn (primary) = volts-per-turn (secondary) Ep/Np = Es/Ns Then: Ep = (Np/Ns) x Es Es = (Ns/Np) x Ep And: WebbSite testing, troubleshooting & commissioning of 13.5 MVA, 132/33/11 kV step-down substations, 33/11/0.4 kV distribution lines, high voltage electrical equipment including transformers, MCCs, switch-gears, circuit breakers, protective relays, disconnecting switches and bus-bars Webb4 kVA Isolation Transformer Features: To step down/up the 3 phase voltage 400V to 208V. Primary and secondary windings are separated by aluminium/copper shield. Available in the circuit of AC 50Hz/60Hz. Better protection, high quality workmanship. 4 kVA Isolation Transformer Specifications Note: is scratch for kids