Interactive labs, calculators & simulators
49 browser-based tools across 11 disciplines. Filter by category, difficulty, audience, or status.
Breaker Trip Unit Simulator
Set LSIG trip unit parameters on a live TCC and see how Long-Time, Short-Time, Instantaneous, and Ground-Fault regions respond to load and fault current — with six presets, five industry-specific Design Lab scenarios, a side-by-side Compare tab, and an Event Simulator.
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.
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.
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.
Protective Relay Coordination / TCC Visualizer
Plot upstream and downstream IEC IDMT relay, breaker, and fuse curves on a live TCC — then verify CTI margin, inject fault current, and step through the trip sequence using six preset coordination scenarios.
Protective Relay Test Record
A complete NETA-compliant protective relay test record for acceptance, maintenance, and commissioning — with dynamic relay element entry, calibrated test equipment logging, visual inspection checklist, deficiency tracking, safety controls documentation, and print-to-PDF output.