Engineering planning checklist

Industrial Electrical Load & Transformer Sizing

Move from measured three-phase load and motor current to a planning-level transformer capacity and annual electricity-cost baseline for plant utility planning.

Use as a checklist, not an automated design workflow. Complete and verify each calculation independently. Only explicit carry-forward links move a compatible value; all other inputs remain your responsibility.

What this workflow covers

Move from measured three-phase load and motor current to a planning-level transformer capacity and annual electricity-cost baseline for plant utility planning.

This 4-step checklist is intended for electrical engineer. Confirm each linked calculator's units, formula, assumptions and operating limits before using the result in a project decision.

Checklist progress0 of 4 steps checked
Sequence Execution
1

Three-Phase Electrical Power

Calculate real power (kW), apparent power (kVA), reactive power (kVAR), and full-load line current for 3-phase AC systems.

WORKFLOW INSTRUCTION:Establish real, apparent, and reactive power from the measured three-phase voltage, current, and power factor.
2

Motor Current Estimation

Calculate full-load line current (FLA) for 3-phase induction electric motors based on power rating and voltage.

WORKFLOW INSTRUCTION:Estimate motor full-load current from the motor rating, voltage, efficiency, and power factor; confirm the nameplate value before procurement.
3

Transformer kVA Rating & Load Sizing (IEC 60076)

Scope-limited calculation

Calculate minimum required transformer kVA capacity rating and secondary full-load current based on active load (kW) and power factor.

WORKFLOW INSTRUCTION:Apply the declared load margin to estimate planning-level transformer kVA and secondary current. Complete a site load study and protection-coordination check before selection.
4

Plant Energy Consumption & Cost

Calculate daily, monthly, and annual electric energy consumption (kWh/MWh) and total electricity operating cost.

WORKFLOW INSTRUCTION:Convert connected load, load factor, operating hours, and tariff into a documented annual energy-cost baseline.

Target Persona

Electrical Engineer
Typical End User