Schweitzer Engineering Laboratories SEL-251 - Table 2.2: SEL-251 Relay Word

2-14 Specifications Date Code 20000421
SEL-251, -2, -3 Instruction Manual
Table 2.2: SEL-251 Relay Word
R1
51P 50L 50H 51QP 50Q 51NP 50NL 50NH
R2
51T 50LT 50C 51QT 50QT 51NT 50NLT 27
R3
79RS 79CY 79LO 79SH 52AT 52BT IN6 IN5
R4
PDEM QDEM NDEM TF CF TCMA ST TRIP
R5
A B C D E F G H
R6
J KT !L V W X Y ZT
! indicates NOT
51P
Phase time-overcurrent element pickup
50L
Phase definite-time overcurrent element pickup
50H
Phase instantaneous overcurrent element
51QP
Negative-sequence time-overcurrent element pickup
50Q
Negative-sequence definite-time overcurrent element pickup
51NP
Ground/Residual time-overcurrent element pickup
50NL
Ground/Residual definite-time overcurrent element pickup
50NH
Ground/Residual instantaneous overcurrent element
51T
Phase time-overcurrent element
50LT
Phase definite-time overcurrent element
50C Phase instantaneous overcurrent element (can override voltage control by 27)
51QT
Negative-sequence time-overcurrent element
50QT
Negative-sequence definite-time overcurrent element
51NT
Ground/Residual time-overcurrent element
50NLT
Ground/Residual definite-time overcurrent element
27
Phase undervoltage element for internal torque control and blown-fuse detection
79RS
Reclosing relay is in the reset state
79CY
Reclosing relay is in the reclose cycle state
79LO
Reclosing relay is in the lockout state
79SH
Shot bit; asserts for shots selected by the M79SH setting
52AT
Time delayed 52A
52BT Inverse of 52AT
IN6
Input IN6 bit; asserts for control voltage applied to input IN6
IN5
Input IN5 bit; asserts for control voltage applied to input IN5