Relay Code - ANSI - Electrical protections
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Page Modified on: April 20, 2019
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So in a great tool to read electric plans and electrical protections according to the ANSI standard from your mobile device.
1.- Main Relay Code:
32 - Directional power relay
32L - Low advance power
32N - Wattmetric Zero-Sequence Directional
32P - Directional power
32R - Reverse power
33 - Position switch
34 - Master sequence device
35 - Short circuit device that operates with brushes or sliding ring
36 - Polarization voltage or polarization device
49 - Machine Thermal Relay or Transformer / Thermal Overload
49RTD - RTD polarized thermal overload
50 - Instantaneous overcurrent relay
50BF - Breaker failure
50DD - Current disturbance detector
50EF - End Fault Protection
50G - Instantaneous ground overcurrent
50IG - Instantaneous overcurrent of isolated ground
50LR - Acceleration time
50N - Neutral instantaneous overcurrent
50 NBF - Neutral instantaneous breaker failure
50P - Instantaneous phase overcurrent
50SG - Instant overcurrent of sensitive earth
50SP - Instantaneous split phase current
50_2 - Instantaneous overcurrent of negative sequence
50/27 - Accidental Energization
50/51 - Instantaneous overcurrent / time delay relay
50Ns / 51Ns - Sensitive ground fault protection
50/74 - Ct Trouble
50/87 - Instantaneous Differential
51 - AC time overcurrent relay
51 - Overload
51G - Ground time overcurrent
51LR - AC inverse time overcurrent protection relay (rotor locked)
51N - Neutral time overcurrent
52a - Position of the AC circuit breaker (contact open when the circuit breaker is open)
52b - Position of the AC circuit breaker (contact closed when the circuit breaker is open)
2.- Acronyms:
AFD - Electric arc detector
CLK - Clock or timing source
CLP - Cold load collection
DDR - Dynamic disturbance recorder
DFR - Digital fault recorder
HMI - Human-machine interface
HST - Historian
LGC - Scheme Logic
MET - Measurement of the substation
PDC - phasor data concentrator
PMU - phasor measurement unit
PQM - Energy quality monitor
RIO - Remote input / output device
RTD - Resistance temperature detector
LRSS - Local / remote selector switch
VTFF - Vt Fuse failure
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