Distance Relay
21
Synchronizing or Synchronism-Check Device
25
Undervoltage Relay
27
Directional Power Relay
32
Field (over/under excitation) Relay
40
Instantaneous Overcurrent
50
AC Time Overcurrent Relay
51
Overvoltage Relay
59
AC Directional Overcurrent Relay
67
Differential Protective Relay
87