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Common ANSI N&A

Common ANSI Numbers and Acronyms

TermDefinition
P Pump
M Motor
a, b Device Status
X,Y,Z Auxiliary Relay
BT Bus Tie
BU Backup
THD Total Harmonics Distortion
AFD Arc Flash Detector
DFR Digital Fault Recorder
MET Substation Metering
PMU Phasor Measurement Unit
DCB Directional Comparison Blocking
DCUB Directional Comparison Unblocking
RTU Remote Terminal Unit
TCM Trip Circuit Monitor
11 Multifunction Device
21 Distance Relay
32 Directional Power Relay
50 Instantaneous Overcurrent Relay
50BF Breaker Failure
51 AC Time Overcurrent Relay
59 Overvoltage Relay
60 Voltage or Current Balance Relay
60N Neutral Current Unbalance
63 Pressure Switch Detector
74 Alarm Relay
81 Frequency Relay
86 Locking-Out Relay
87 Differential Protective Relay
87B Bus Differential
87T Transformer Differential
89 Line Switch
R Reactor
U Under
TD Time Delay
POTT Permissive Overreaching Transfer Trip
24 Volts-per-Hertz Relay or Overfluxing
27 Undervoltage Relay
52 AC Circuit Breaker
67 Directional Overcurrent Relay
94 Tripping or Trip-Free Relay
79 AC Reclosing Relay
A Alarm
B Bus
C Capacitor
F Feeder
G Ground
L Line
T Transformer
O Over
V Voltage
BF Breaker Failure
HMI Human Machine Interface
25 Synchronizing Device
49 Transformer Thermal Relay
90 Regulating Device
27P Phase Undervoltage
50P Phase Instantaneous Overcurrent
50N Neutral Instantaneous Overcurrent
51P Phase Time Overcurrent
51N Neutral Time Overcurrent
87L Line Current Differential
21G Ground Distance
21P Phase Distance
67G Ground Directional Overcurrent
81O Over Frequency
81U Under Frequency
Created by: mmrodriguez56
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