Relay Code - ANSI - Electrical protections

About Relay Code - ANSI - Electrical protections

This app shows the relay codes used in electrical protections according to the ANSI standard.

It allows you to add the most consulted relay codes to favorites and share.

Becoming 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