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AFD : Arc Flash Detector
CLK : Clock or Timing Source
CLP : Cold Load Pickup
DDR : Dynamic Disturbance Recorder
DFR : Digital Fault Recorder
ENV : Environmental Data
HIZ : High Impedance Fault Detector
HMI : Human Machine Interface
HST : Historian
MET : Substation Metering
PDC : Phasor Data Concentrator
PMU : Phasor Measurement Unit
PQM : Power Quality Monitor
RIO : Remote Input/Output Device
RTD : Resistance Temperature Detector
RTU : Remote Terminal Unit / Data Concentrator
SER : Sequence of Events Recorder
TCM : Trip Circuit Monitor
VTFF : Vt Fuse Fail
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