Power system protection
Protection schemes, explained visually
Interactive schematics and trip characteristics for the relays used on site — built for commissioning engineers, not textbooks.
ANSI 87
Differential Protection
Live schematic comparing current in vs. out of a protected zone, three fault scenarios, and the percentage bias trip characteristic.
ANSI 50/51
Overcurrent (IDMT)
Coming soon — time-current characteristic curves and pickup settings.
ANSI 21
Distance Protection
Coming soon — impedance zones and reach settings.
ANSI 81
Under/Over Frequency
Coming soon — load-shedding stages and trip curves.