Sel 551 - Page 109

Date _______________
Date Code 20110408 Instruction Manual SEL-551 Relay
SET.3 of 12Settings Sheets for the SEL-551 Relay
Relay Settings (SET Command)
Curve (U1–U5, C1–C5; see Figure 4.1–Figure 4.10) 51N1C =
Time Dial
0.50–15.00 for curves U1–U5
0.05–1.00 for curves C1–C5
51N1TD =
Electromechanical Reset (Y, N)
51N1RS =
Residual Ground Instantaneous Overcurrent Elements 50G1, 50G2
(see Figure 3.7)
Pickup
(OFF, 0.5–80.0 A in 0.1 A increments) (5 A nominal)
(OFF, 0.1–16.0 A in 0.1 A increments) (1 A nominal)
50G1P =
Pickup
(OFF, 0.5–80.0 A in 0.1 A increments) (5 A nominal)
(OFF, 0.1–16.0 A in 0.1 A increments) (1 A nominal)
50G2P =
Residual Ground Time-Overcurrent Elements 51G1T (see Figure 3.11)
Pickup
(OFF, 0.5–16.0 A in 0.1 A increments) (5 A nominal)
(OFF, 0.1–3.2 A in 0.1 A increments) (1 A nominal)
51G1P =
Curve (U1–U5, C1–C5; see Figure 4.1–Figure 4.10)
51G1C =
Time Dial
0.50–15.00 for curves U1–U5
0.05–1.00 for curves C1–C5
51G1TD =
Electromechanical Reset (Y, N)
51G1RS =
Negative-Sequence Instantaneous Overcurrent Elements 50Q1, 50Q2
(see Figure 3.8)
IMPORTANT: See Appendix F: Setting Negative-Sequence Overcurrent Elements for information on
setting negative-sequence overcurrent elements.
Pickup
(OFF, 0.5–80.0 A in 0.1 A increments) (5 A nominal)
(OFF, 0.1–16.0 A in 0.1 A increments) (1 A nominal)
50Q1P =
Pickup
(OFF, 0.5–80.0 A in 0.1 A increments) (5 A nominal)
(OFF, 0.1–16.0 A in 0.1 A increments) (1 A nominal)
50Q2P =