Power Factor Correction and Capacitor Current Calculator
Estimates required capacitor-bank kvar to move a load from an entered initial power factor to a target power factor, and estimates three-phase line current...
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Three-Phase Load Balance Measurement
Summarizes three measured phase currents or apparent-load values using the same measurement basis on all phases. It reports arithmetic imbalance only and does not...
Open calculatorThree-Phase Voltage Unbalance Calculator
Calculates maximum line-to-line voltage deviation from the mean of three measured values. It reports a measurement ratio only and does not apply a motor...
Open calculatorTransformer kVA and Full-Load Current Calculator
Calculates single- or three-phase apparent power and primary or secondary full-load current from electrical quantities.
Open calculatorTransformer Loading and Capacity Margin Calculator
Calculates apparent load, percentage loading, and unused nameplate capacity from measured load inputs.
Open calculatorTransformer OCPD Current Estimate
Calculates transformer-side current and applies a user-entered percentage for preliminary comparison; it does not determine NEC-permitted overcurrent protection.
Open calculatorTransformer Secondary Fault Current Estimate
Estimates three-phase symmetrical RMS bolted fault current at transformer terminals using transformer full-load current and percent impedance, assuming an infinite upstream source and neglecting...
Open calculatorUPS Battery Runtime Energy Estimate
An idealized energy estimate from nominal battery energy, user-entered usable fraction, efficiency, and load. Actual runtime depends on manufacturer discharge curves, cutoff voltage, discharge...
Open calculatorUPS Load Capacity Screening
Calculates connected load in watts and apparent load in VA, then applies a user-selected planning allowance. Product selection must also satisfy the UPS manufacturer's...
Open calculatorVFD Output Current Class Estimate
Applies a user-selected design factor to motor nameplate current to calculate a generic current target. Final drive selection must follow manufacturer sizing and overload...
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