Schweitzer Engineering Laboratories SEL-251 - Page 130

SETTINGS SHEET Page 2 of 5
FOR THE SEL-251, -2, -3 RELAY Date
RELAY SETTINGS GROUP ___
Date Code 20000421
Negative-Sequence Definite-Time Overcurrent Element
Negative-Sequence Definite-Time Overcurrent Pickup, A sec (0.50-100.00)* 50Q =
Negative-Sequence Definite-Time Overcurrent Time Delay, cycles (0-
16000)
50QT =
Negative-Sequence Time-Overcurrent Element
Negative-Sequence Time Overcurrent Pickup, A sec (1.00-12.00)* 51QP =
Negative-Sequence Time Overcurrent Time Dial (0.50-15.00) 51QTD =
Negative-Sequence Time Overcurrent Curve (1=Moderately Inverse,
2=Inverse, 3=Very Inverse, 4=Extremely Inverse)
51QC =
Electromechanical Reset (Y, N) 51QRS =
Residual Ground Definite-Time/Instantaneous Overcurrent Elements
Residual Ground Definite-Time Overcurrent Pickup, A sec (0.125-100.00)* 50NL =
Residual Ground Definite-Time Overcurrent Time Delay, cycles (0-16000) 50NLT =
Residual Ground Instantaneous Overcurrent Pickup, A sec (0.125-100.00)* 50NH =
Residual Ground Time-Overcurrent Element
Residual Ground Time Overcurrent Pickup, A sec (0.25-12.00)* 51NP =
Residual Ground Time Overcurrent Time Dial (0.50-15.00) 51NTD =
Residual Ground Time Overcurrent Curve (1=Moderately Inverse,
2=Inverse, 3=Very Inverse, 4=Extremely Inverse)
51NC =
Electromechanical Reset (Y, N) 51NRS =
Phase Definite-Time/Instantaneous Overcurrent Elements
Phase Definite-Time Overcurrent Pickup, A sec (0.50-100.00)* 50L =
Phase Definite-Time Overcurrent Time Delay, cycles (0-16000) 50LT =
Phase Instantaneous Overcurrent Pickup, A sec (0.50-100.00)* 50H =
Phase Time-Overcurrent Element
Phase Time Overcurrent Pickup, A sec (1.00-12.00)* 51P =
Phase Time Overcurrent Time Dial (0.50-15.00) 51TD =
Phase Time Overcurrent Curve (1=Moderately Inverse, 2=Inverse, 3=Very
Inverse, 4=Extremely Inverse)
51C =
Electromechanical Reset (Y, N) 51RS =
52A Time Delay Data
Time Delay Pickup for 52AT, cycles (0-16000) 52APU =
Time Delay Dropout for 52AT, cycles (0-16000) 52ADO =
* Settings range for 5-amp nominal current inputs shown. Divide by five for 1-amp nominal current
input relays.