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 Calculator
Calculate the RMS current in a series RLC circuit with sinusoidal supply from voltage, frequency and component values.
Open calculator →Power Factor Calculator
Calculate the power factor of a single-phase AC load from real power, RMS voltage and RMS current.
Open calculator →Power Factor Correction Capacitor Calculator
Calculate the parallel capacitance needed to improve the displacement factor of a single-phase inductive load.
Open calculator →RLC Circuit Q Factor Calculator
Calculate the resonant frequency and quality factor Q of an idealised series RLC circuit from R, L and C.
Open calculator →Three-Phase Reactive Power Calculator
Calculate the reactive power of a balanced three-phase load from line voltage, line current and power factor.
Open calculator →RL Circuit Impedance Calculator
Calculate the impedance of a series resistor-inductor circuit under sinusoidal AC voltage.
Open calculator →Earth Electrode Resistance Calculator (Hemisphere)
Calculate the spreading resistance of a hemispherical earth electrode in homogeneous soil from soil resistivity and electrode radius.
Open calculator →Star Connection Voltage Calculator
Calculate the line voltage of a balanced star-connected three-phase load from the phase voltage, or the reverse.
Open calculator →Delta Connection Current Calculator
Calculate the line current of a balanced delta-connected three-phase load from the phase current, or the reverse.
Open calculator →Short-Circuit Power Calculator
Calculate the short-circuit power at a three-phase network point from rated voltage and the expected short-circuit current.
Open calculator →Three-Phase Power Calculator
Calculate the real power of a balanced three-phase system from line voltage, current and power factor.
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