Protection engineering tools
Interactive calculators for relay setting and coordination studies on transmission and generation projects. Every input can be edited, and everything runs in the browser.
IDMT Overcurrent Relay Simulator
Trip-time curves for up to four relays across a transformer, with fault current derived from the transformer data, coordination time intervals, cable and inrush overlays, and PDF and CSV export.
Open tool → Transformer differentialBias Characteristic Simulator
Compares the bias characteristics of two relays on a common per-unit base, tests operating points from measured phasors with vector-group compensation, and replays COMTRADE records.
Open tool → DistanceDistance Reach and Power Swing Sheet
Zone reach criteria with adjacent lines and transformers, residual compensation, resistive reach, load encroachment and power swing blinders on the R/X diagram. Outputs a setting sheet for the relay engineer.
Open tool →