Date Code 20100129 Instruction Manual SEL-751A Relay
List of Figures
R.Instruct ion Manual
Figure 1.1 Typical Current Connections................................................................................................ 1.15
Figure 1.2 Response Header.................................................................................................................. 1.17
Figure 1.3 STA Command Response—No Communications Card or EIA-232⁄ EIA-485
Communications Card ...................................................................................................... 1.17
Figure 1.4 STA Command Response—Communications Card/DeviceNet Protocol............................ 1.18
Figure 2.1 Relay Panel-Mount Dimensions............................................................................................. 2.2
Figure 2.2 Slot Allocations for Different Cards ...................................................................................... 2.3
Figure 2.3 Circuit Board of Analog I/O Board, Showing Jumper Selection ......................................... 2.11
Figure 2.4 JMP1 Through JMP4 Locations on 4 AI/4 AO Board......................................................... 2.11
Figure 2.5 Current Output Jumpers ....................................................................................................... 2.12
Figure 2.6 Voltage Output Jumpers ....................................................................................................... 2.12
Figure 2.7 Pins for Password, Breaker Control, and SEL
BOOT Jumper................................................ 2.12
Figure 2.8 Rear-Panel Connections of Selected Cards.......................................................................... 2.14
Figure 2.9 Fiber-Optic Serial, Ethernet, EIA-232 Communication, 3 DI/4 DO/1 AO, and 3 AVI
Voltage Option .................................................................................................................. 2.15
Figure 2.10 Fiber-Optic Serial, Ethernet, 8 DI, RTD, and 4 AI/4 AO Option ........................................ 2.16
Figure 2.11 Dual Fiber-Optic Ethernet, Fiber-Optic Serial, DeviceNet, Fast Hybrid 4 DI/4 DO, and
Voltage Option With Monitoring Package........................................................................ 2.16
Figure 2.12 Fiber-Optic Serial, Ethernet, EIA-232 Communication, 4 DO/3 DI/1AO, and
3 AVI/4 AFDI Voltage Option With Arc-Flash Detector Inputs ...................................... 2.17
Figure 2.13 Control I/O Connections—4 AI/4 AO Option in Slot D and Fiber-Optic Port in Slot B..... 2.19
Figure 2.14 Control I/O Connections—Internal RTD Option ................................................................. 2.19
Figure 2.15 Output OUT103 Relay Output Contact Configuration ........................................................ 2.20
Figure 2.16 OUT103 Contact Fail-Safe and Nonfail-Safe Options......................................................... 2.20
Figure 2.17 Single-Phase Voltage Connections....................................................................................... 2.21
Figure 2.18 Voltage Connections............................................................................................................. 2.22
Figure 2.19 Typical Current Connections................................................................................................ 2.23
Figure 2.20 SEL-751A Provides Overcurrent Protection and Reclosing for a Distribution Feeder
(Includes Fast Bus Trip Scheme) (Delta-Connected PTs)................................................ 2.24
Figure 2.21 SEL-751A Provides Overcurrent Protection for a Distribution Bus
(Includes Fast Bus Trip Scheme) (Wye-Connected PTs) ................................................. 2.25
Figure 2.22 SEL-751A Provides Overcurrent Protection for a Delta-Wye Transformer Bank
(Wye-Connected PTs)....................................................................................................... 2.26
Figure 2.23 SEL-751A Provides Overcurrent Protection for a Transformer Bank With a
Tertiary Winding (Wye-Connected PTs) .......................................................................... 2.27
Figure 2.24 SEL-751A Provides Overcurrent Protection for an Industrial Distribution Feeder
(Core-Balance Current Transformer Connected to Channel IN)...................................... 2.28
Figure 2.25 SEL-751A With an Arc-Flash Option Card and Fiber-Optic-Based Point-Sensor.............. 2.29
Figure 2.26 Jacketed-Fiber installation Example .................................................................................... 2.30
Figure 2.27 Connecting Sensor Fibers to the Relay ................................................................................ 2.30
Figure 2.28 Point-Sensor Assembly ........................................................................................................ 2.30
Figure 2.29 Point-Sensor Installation ...................................................................................................... 2.31
Figure 2.30 Point-Sensor Directivity (0–360° Around the Mounting Plane).......................................... 2.31
Figure 2.31 Point-Sensor Directivity (Front to Back, Above the Mounting Plane) ................................ 2.32
Figure 2.32 Point-Sensor Directivity (Left to Right, Above the Mounting Plane).................................. 2.32
Figure 2.33 Bare-Fiber Sensor Assembly................................................................................................ 2.33
Figure 2.34 Bare-Fiber Sensor Mounting Example................................................................................. 2.33
Figure 2.35 Bare-Fiber Sensor Components (V-Pin Style) ..................................................................... 2.33
Figure 2.36 Bare-Fiber Sensor Showing Transition From Bare- to Jacketed-Fiber Section ................... 2.34
Figure 2.37 Switchgear Application Example......................................................................................... 2.35
Figure 3.1 Serial Port Communication Dialog Box................................................................................. 3.2
Figure 3.2 Serial Port Communication Parameters Dialog Box.............................................................. 3.3
Figure 3.3 Network Communication Parameters Dialog Box................................................................. 3.3
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