AC, three-phase power and electrical installation
Impedance, power factor, reactive-power compensation, wye and delta connections, short-circuit power, cable sizing and earthing resistance.
Define the network and operating point, separate apparent, real and reactive components, then check the installation against code limits.
Calculators in this category
Cable Cross-Section from Voltage Drop
Determine the cable cross-section a single-phase, three-phase or DC circuit needs to stay within the permitted voltage drop, with the next standard IEC 60228 size, the drop actually achieved in volts and per cent, and the cable power loss.
Open calculator →RLC series-circuit current
Calculate RMS current in a sinusoidally supplied series RLC circuit from voltage, frequency and component values.
Open calculator →Power factor from real and apparent power
Determine a single-phase AC load's power factor from real power, RMS voltage and RMS current.
Open calculator →Power-factor correction capacitor
Estimate parallel capacitance needed to improve the displacement factor of a single-phase inductive load.
Open calculator →Series RLC circuit quality factor
Classify undamped resonance and quality factor of an idealised series RLC circuit from R, L and C.
Open calculator →Three-phase reactive power
Determine reactive power of a balanced three-phase system from line voltage, line current and power factor.
Open calculator →RL series circuit impedance
Calculate the impedance of a series resistor-inductor circuit under sinusoidal AC.
Open calculator →Spreading resistance of a hemispherical earth electrode
Estimate the spreading resistance of a hemispherical earth electrode in homogeneous soil from soil resistivity and electrode radius.
Open calculator →Wye connection: line voltage from phase voltage
Calculate the line voltage of a balanced wye-connected three-phase load from phase voltage, or the reverse.
Open calculator →Delta connection: line current from phase current
Calculate the line current of a balanced delta-connected three-phase load from phase current, or the reverse.
Open calculator →Three-phase network short-circuit power
Calculate short-circuit power at a network point from rated voltage and the expected short-circuit current there.
Open calculator →Three-phase AC power
Calculate real power of a balanced three-phase system from line voltage, current and power factor.
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