# Online Relay Coordination Study — RelayCoordination.com

RelayCoordination.com provides online tools for overcurrent and earth-fault protection coordination, IDMT and definite-time relay analysis, time-current characteristic (TCC) charts, dynamic single-line diagrams, fault simulation and engineering outputs.

## Study modes
- [Basic relay coordination](https://www.relaycoordination.com/RC_Live.html)
- [Advance relay coordination](https://www.relaycoordination.com/Advance.html)
- [Relay trip-time calculator](https://www.relaycoordination.com/RC_trip_calc.html)

## Features
- Relay pickup and operating-time calculations
- OC and EF time-current characteristics and coordination margins
- Transformer-related current transformations and earth-fault behavior
- Fault simulation, equipment hierarchy and coordination checks
- Motor starting and load-related coordination constraints
- Exportable studies and engineering reports

## Documentation
- [Technical guide](https://www.relaycoordination.com/guide.html)
- [FAQ](https://www.relaycoordination.com/faq.html)
- [About](https://www.relaycoordination.com/about.html)
- [Contact](https://www.relaycoordination.com/contact.html)
- [Privacy](https://www.relaycoordination.com/privacy.html)
- [Terms](https://www.relaycoordination.com/terms.html)
- [AI-friendly resource listing](https://www.relaycoordination.com/llms.txt)

## Safety
The platform supports engineering analysis; it is not an approval to apply protection settings. Verify all study results with original equipment data, applicable standards and competent plant engineering review.