Play with power.
Calculators and simulators for plant and power engineers. Grab a trustworthy number in seconds — a per-unit conversion, sequence components, a correction-bank size — or drive a live model until the intuition sticks. Each module pairs a live diagram and plot with the governing equations. Nothing here is a project record: documented design calculations live in EE-Calculations.
AC Power & Waveforms
One load, every view: v, i, and p(t) waveforms, phasors, and the power triangle with its distortion leg — IEEE 1459 quantities with current harmonics and PF decomposition.
PowerThe Power Triangle
Type any of P, Q, S, power factor, or angle and watch the rest solve — plus a capacitor-sizing power-factor corrector.
FundamentalsPer Unit System
Zbase, Ibase, and the Ω ↔ pu ↔ % converter with change of base — plus the transformer invariance demo that shows why per-unit exists.
CircuitsRLC Resonance
Series and parallel resonance: how impedance, current, and voltage move with frequency — and the harmonic resonance that wrecks capacitor banks.
MachinesTransformer Fundamentals
The ideal ratio, then the real machine: %Z, voltage regulation, core vs. copper losses, efficiency, and the fault duty a transformer lets through.
MachinesInduction Motor Fundamentals
Slip and the torque–speed curve: why inrush is 6× with little torque to show for it, torque ∝ V², and what a V/f drive really changes.
MachinesSynchronous Generator Fundamentals
E behind Xs on an infinite bus: the governor pushes watts, the exciter pushes vars — phasors, the P–δ curve, and pull-out.
MagneticsCores & Saturation
The B–H curve, core area, and the volts-per-hertz that drives a transformer into saturation and inrush.
FaultsSymmetrical Components
Convert phase quantities to sequence components and back — live phasor diagrams, residual 3I₀, unbalance factor, and the sequence-network connection gallery.
DrivesVFD Harmonics
Watch a 6-pulse drive distort the current waveform; step through reactors, 12-pulse, and active front ends to tame the THD.
ProtectionDistance Protection & the Mho Circle
Reach, zones, and the R–X plane: how a relay turns impedance into distance, plus fault current and infeed under-reach.
StabilityDynamic Stability & Swing
Power-angle curve, the equal-area criterion, and the energy-well "rolling ball" — trip a fault and watch the rotor stay in step or slip.
FieldsEM Fields & Wave Propagation
Electric and magnetic fields in motion: Maxwell coupling, the Poynting vector, velocity factor, and skin depth.
EMC · RacewaysCable Coupling & Raceway Separation
Separate power from instrumentation: capacitive vs. inductive coupling, and how distance, frequency, and shielding keep signals clean.