Date Code 20080213 Instruction Manual SEL-351A Relay
List of Figures
Figure 1.1 SEL-351A Relays Applied Throughout the Power System ................................................... 1.6
Figure 1.2 SEL-351A Inputs, Outputs, and Communications Ports........................................................ 1.8
Figure 1.3 SEL-351A Communications Connections Examples ............................................................ 1.9
Figure 2.1 SEL-351A Dimensions for Rack-Mount and Panel-Mount Models...................................... 2.3
Figure 2.2 SEL-351A Rear-Panel Diagram—Conventional Terminal Blocks, Horizontal Example...... 2.5
Figure 2.3 SEL-351A Front-Panel Drawings (Rack Mount Relays)....................................................... 2.6
Figure 2.4 SEL-351A Front-Panel Drawings (Panel-Mount Relays)...................................................... 2.7
Figure 2.5 SEL-351A Front-Panel Drawing (Vertical Panel-Mount Relay, Model 0351A0x41)
and Rear-Panel Drawing (Vertical Relay, Conventional Terminal Blocks,
Model 0351A0041)............................................................................................................. 2.8
Figure 2.6 SEL-351A Rear-Panel Drawings—Connectorized Models 0351A0WH,
0351A0W3, or 0351A0W5 (Horizontal) and 0351A0W4 (Vertical) ................................. 2.9
Figure 2.7 SEL-351A Plug-In Connector Coding (Top View; Model 0351A0W)................................ 2.11
Figure 2.8 Broken-Delta Secondary Connection to Voltage Input VS, Wye-Connected PTs............... 2.16
Figure 2.9 Resultant Voltage V
S
from the Collapse of Voltage V
A
in the Broken-Delta
Secondary (Compared to the Wye-Connected Power System Voltages).......................... 2.17
Figure 2.10 Broken-Delta Secondary Connection to Voltage Input VS, Open-Delta Connected PTs.... 2.17
Figure 2.11 Resultant Voltage V
S
from the Collapse of Voltage V
A
in the Broken-Delta Secondary
(Compared to the Open-Delta Connected Power System Voltages)................................. 2.18
Figure 2.12 SEL-351A Provides Overcurrent Protection and Reclosing for a Utility Distribution
Feeder (Includes Fast Bus Trip Scheme) (Wye-Connected PTs) ..................................... 2.20
Figure 2.13 SEL-351A Provides Overcurrent Protection for a Distribution Bus
(Includes Fast Bus Trip Scheme) (Wye-Connected PTs) ................................................. 2.21
Figure 2.14 SEL-351A Provides Directional Overcurrent Protection and Reclosing for a
Transmission Line (Wye-Connected PTs)........................................................................ 2.22
Figure 2.15 SEL-351A Provides Directional Overcurrent Protection and Reclosing for a Transmission
Line (Current Polarization Source Connected to Channel IN) (Wye-Connected PTs) .... 2.23
Figure 2.16 SEL-351A Provides Overcurrent Protection for a Delta-Wye Transformer Bank
(Wye-Connected PTs)....................................................................................................... 2.24
Figure 2.17 SEL-351A Provides Overcurrent Protection for a Transformer Bank With a Tertiary
Winding (Wye-Connected PTs)........................................................................................ 2.25
Figure 2.18 SEL-351A Provides Overcurrent Protection for an Industrial Distribution Feeder
(Core-Balance Current Transformer Connected to Channel IN)...................................... 2.26
Figure 2.19 SEL-351A Provides Dedicated Breaker Failure Protection ................................................. 2.27
Figure 2.20 SEL-351A Provides Overcurrent Protection for a High-Impedance or Low-Impedance
Grounded System (Wye-Connected PTs)......................................................................... 2.28
Figure 2.21 SEL-351A Provides Overcurrent Protection for a Petersen Coil Grounded System
(Wye-Connected PTs)....................................................................................................... 2.29
Figure 2.22 SEL-351A Provides Overcurrent Protection for an Ungrounded System
(Wye-Connected PTs)....................................................................................................... 2.30
Figure 2.23 SEL-351A Provides Overcurrent Protection for an Ungrounded System
(Open-Delta Connected PTs, Broken-Delta 3V0 Connection)......................................... 2.31
Figure 2.24 SEL-351A Provides Overcurrent Protection and Reclosing for a Utility Distribution Feeder
(Open-Delta Connected PTs and Line-to-Ground Synchronism-Check Connection) ..... 2.32
Figure 2.25 SEL-351A Provides Underfrequency Load Shedding, Overcurrent Protection,
and Reclosing for a Utility Distribution Feeder (Single Voltage Connection)................. 2.33
Figure 2.26 Jumper, Connector, and Major Component Locations on the SEL-351A Main Board ....... 2.35
Figure 3.1 Levels 1 Through 4 Phase Instantaneous Overcurrent Elements ........................................... 3.2
Figure 3.2 Levels 5 Through 6 Phase Instantaneous Overcurrent Elements ........................................... 3.2
Figure 3.3 Levels 1 Through 4 Phase Instantaneous/Definite-Time Overcurrent Elements
(With Directional Control Option) (Not in SEL-351A-1) .................................................. 3.4
Figure 3.4 Combined Single-Phase Instantaneous Overcurrent Elements .............................................. 3.6
Figure 3.5 SEL-351A Nondirectional Instantaneous Overcurrent Element Pickup Time Curve............ 3.7
Figure 3.6 SEL-351A Nondirectional Instantaneous Overcurrent Element Reset Time Curve .............. 3.7
Courtesy of NationalSwitchgear.com
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