An entry-level three-phase and earth fault over currentrelay presented in an educational format. Supplied with Protection and RelayTest Set, the relay enables investigations into protection and monitoring oftransformers, transmission lines and distribution schemes. The relay is housedin a robust enclosure with carrying handle. The module mounts on the desk areaof the Protection and Relay Test Set, and connects to the test set using amulti-core cable and safety leads. This relay is also an optional ancillary forselected products in Power Systems range. The lecturer or student sets up differentfault circuits on the Protection and Relay Test Set. They then use the keypadand display on the relay module to program it to the settings needed for thetests. They can also use the relay support software and a suitable computer toprogram the relay module. The relay module is then connected to the faultcircuits so tests can be performed. Most tests are performed using singlerelays. However, there are enough connections on the Protection and Relay TestSet to test two relay modules at the same time.
The main functions of the Over currentand Earth Fault Relay include: