ANSI Codes for Protection Relays in Electrical Substations
Protection Relays ANSI Codes:
21 – Distance Relay
67 – Directional Overcurrent Relay
67N - Directional Earth Fault Relay
51 – Non-directional Overcurrent relay
51N – Non-directional Earth Fault Relay
50 – Instantaneous/ Definite time relay/ Overload Relay
79 – Auto reclose relay
87 – Differential Relay for Transformer
87L – Line Differential Relay
87B – Bus Differential Relay (Busbar Relay)
64 – Restricted Earth Fault (REF) relay
50BF – Breaker Failure Relay (LBB)
27 – Undervoltage Relay
59 – Overvoltage Relay
86 – Master Trip relay/Lockout Relay
96 – LBB/Busbar Trip Relay
21x – self reset aux. relay for distance relay
95 – Trip Circuit supervision relay
80A/80B – DC supervision relays
52x – CMR for circuit breaker
89L – CMR for line isolator
89LE – CMR for earth-switch
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