Interactive labs, calculators & simulators
49 browser-based tools across 11 disciplines. Filter by category, difficulty, audience, or status.
Differential Protection Simulator
Simulate 87T transformer and 87B bus differential protection — adjust slope, pickup, and harmonic restraint, then drive internal faults, external faults, and inrush to see the operate/restraint characteristic respond 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.
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.
Transformer Winding Resistance Test Report
A NETA and IEEE C57.152 field test record for transformer winding resistance — with a configuration wizard (Dyn/Ynd/Dd/Yyn presets, 1–33 tap positions), temperature correction to 75°C or 20°C using IEEE C57 constants, phase balance and deviation analysis, trend comparison against prior/factory test data, and print-to-PDF output.