Relay codes2 Time Delay Relay 40 Loss Of Excitation

21 Distance Protection 46 Negative Phase Sequence

25 Check Synchronising 49 Thermal Overload

27 Under Voltage 50 Instantaneous Over Current

27R Residual Voltage Check 50N Instantaneous Earth Fault

27M Under Voltage (Motor Protection) 51 IDMTL Over Current

27H Voltage Healthy Check 51G Standby Earth Fault32 Reverse Power 51V Voltage Restrained IDMTL Over Current37 Low Forward Power 59 Over Voltage

60 Neutral Displacement 95 Trip Circuit Supervision63TX Auxilary Relay For Xr Trouble/Trip 97 PT Monitoring64F Rotor Earth Fault 98 Dead Bus

Stator Earth Fault Main And Backup 99 Over Fluxing

64R Restricted Earth Fault MPR Motor Protection Relay

67 Directional Over Current ELR Earth Leakage Relay67N Directional Earth Fault78 Out of Step Relay80 Control Supply Supervision81 Under Frequency / df/dt86 Lock Out

87CH Check Differential87F Differential

F- FeederG- GeneratorT- Transformer

64G1,2

GT- Gen + Trafo Combined