Interactive labs, calculators & simulators
49 browser-based tools across 11 disciplines. Filter by category, difficulty, audience, or status.
Arc Flash Concept Simulator
Explore how voltage, available fault current, working distance, clearing time, equipment configuration, and protection features influence conceptual incident energy and arc-flash boundary behavior.
CT / PT and Relay Measurement Simulator
Trace how current and voltage transformers scale primary quantities for relay inputs — then inject load, fault, and ground fault currents to see how overcurrent, differential, and directional relays respond in real time.
Fault Current & Short-Circuit Simulator
Model three-phase, SLG, LL, and DLG faults across a four-bus radial system using the per-unit method — with configurable source impedance, transformer, cable, and relay — and a clear statement of what a code-grade study includes that this educational tool does not.
Generator, ATS & Emergency Power Sequence Simulator
Step through the full utility-loss-to-generator-transfer sequence — start delay, warm-up, ATS transfer, re-transfer, cooldown — with configurable timing parameters, a live one-line diagram, state machine view, and event timeline.
Grounding & Bonding System Visualizer
Visualize grounding and bonding current paths across service entrances, separately derived sources, generators, and UPS systems — with fault injection showing how grounding method and bonding connections control fault-current return paths.
Harmonics & Waveform Distortion Lab
Build distorted waveforms by mixing harmonic orders 3 through 13, measure THD and K-factor in real time, and explore how VFDs, rectifiers, LED drivers, and office electronics each create distinct harmonic signatures.
Motor Starting Simulator
Compare Across-the-Line, Reduced Voltage Auto-Transformer, Soft Starter, and VFD starting methods on live current, speed, and torque curves — with configurable HP, inertia, NEMA design class, and voltage from 208 V to 4160 V.
One-Line Diagram Builder & Explorer
Build, edit, and explore single-line diagrams using standard power system symbols — with automatic energized-path tracing, load aggregation, connection mapping, and five preset system topologies.
Power Factor Correction Simulator
Add capacitor bank kVAR to a lagging-power-factor load and watch the power triangle, current, and illustrative utility penalty model update — with six real-world load scenarios and an over-correction demonstration.
Power System Simulator
Model a three-phase or single-phase power system — configure source voltage, a transformer, and multiple loads, apply power factor correction, and see live phasor diagrams, voltage and current waveforms, and system metrics update in real time.
Power Transformer Simulator
Model a power transformer from 25 kVA to 10 MVA — adjust loading, impedance, power factor, tap position, and ambient temperature, then explore efficiency curves, thermal loading, voltage regulation, and fault behavior.
Protection Zone & Relay Scheme Explorer
Explore protection zones, relay responsibility areas, and scheme behavior across four system topologies — then drive fault scenarios including feeder faults, bus faults, transformer internal faults, backup operation, and breaker failure.
Substation & Switchgear Bus Configuration Explorer
Compare Single Bus, Double-Ended, Sectionalized, and Alternate Source topologies under normal operation and fault conditions — evaluate reliability metrics, model transfer types, and walk through six sequenced operations scenarios.
Symmetrical Components & Fault Visualizer
Decompose unbalanced three-phase systems into positive, negative, and zero-sequence networks — then drive fault current through them and see every sequence quantity update in real time.
Transformer Vector Group & Polarity Visualizer
Visualize Delta-Wye, Wye-Delta, Delta-Delta, and Wye-Wye transformer connections with live phasor diagrams showing primary and secondary voltage relationships, phase shift, and polarity for balanced, unbalanced, and single-phase conditions.