Schweitzer Engineering Laboratories SEL-751 - Table 1.2 Current (ACI) and Voltage (AVI) Card Selection for SEL-751 Models; Table 1.1 Phase and Neutral Current Ratings Selection for the SEL-751 Models; Table 1.3 SEL-751 Protection Elements

1.2
SEL-751 Relay Instruction Manual Date Code 20170927
Introduction and Specifications
Features
Table 1.2 shows current (ACI) and voltage (AVI) card selection for the
SEL-751 models.
The SEL-751 offers an extensive variety of protection features, depending on
the model and options selected. Table 1.3 lists the protection features available
in different models.
Table 1.1 Phase and Neutral Current Ratings Selection for the SEL-751
Models
Current Rating MOT String Digit Number 15
1 Amp Phase, 1 Amp Neutral 1
1 Amp Phase, 5 Amp Neutral 2
1 Amp Phase, 200 mA Neutral 3
5 Amp Phase, 5 Amp Neutral 5
5 Amp Phase, 1 Amp Neutral 6
5 Amp Phase, 200 mA Neutral 7
Table 1.2 Current (ACI) and Voltage (AVI) Card Selection for SEL-751 Models
Model Description
Slot Z Card Option
(MOT String Digital
Number 14, 15)
Slot Z Inputs
Slot E Card
Option
(MOT String
Digits Number
12, 13)
Slot E Inputs
Base SEL-751 With AC Voltages (300 Vac) 4 ACI/3 AVI
(81, 82, 83, 85, 86, 87)
IA, IB, IC, IN,
VA, VB, VC
None (0X) None
Base SEL-751 With LEA AC Voltages (8 Vac) 4 ACI/3 AVI
(L1, L2, L3, L5, L6, L7)
IA, IB, IC, IN,
VA, VB, VC
None (0X) None
SEL-751 With AC Phase Voltages (300 Vac),
Vsync (300 Vac), Vbat (300 V) Input, and
4 Arc-Flash Detections Inputs
4ACI/3AVI
(81, 82, 83, 85, 86, 87)
IA, IB, IC, IN,
VA, VB, VC
2 AVI/4 AFDI
(70)
VS, VBAT, AF1,
AF2, AF3, AF4
SEL-751 With LEA AC Phase Voltages
(8 Vac), LEA Vsync (8 Vac), Vbat (300 V)
Input, and 4 Arc-Flash Detection Inputs
4ACI/3AVI
(L1, L2, L3, L5, L6, L7)
IA, IB, IC, IN,
VA, VB, VC
2 AVI/4 AFDI
(L0)
VS, VBAT, AF1,
AF2, AF3, AF4
SEL-751 AC Currents Only 4 ACI
(A1, A2, A3, A5, A6, A7)
IA, IB, IC, IN None (0X) None
Table 1.3 SEL-751 Protection Elements (Sheet 1 of 3)
Protection Element
Slot Z 4 ACI/3 AVI
Card With 1 A or 5 A
Neutral Channel
Slot Z 4 ACI/3 AVI
Card With 200 mA
Neutral Channel
Slot Z 4 ACI Card
(Current Only Model)
With 1 A or 5 A
Neutral Channel
50P Max. Phase Overcurrent X X X
67P Max. Phase Overcurrent With
Directional Control
X
a
X
b
50Q Neg.-Seq. Overcurrent X X X
67Q Neg.-Seq. Overcurrent With
Directional Control
X
a
X
b
50G Residual Overcurrent X X X
67G Residual Overcurrent With
Directional Control
X
a
X
b
50N Neutral Overcurrent X X X