xiList of Figures
Date Code 20080213 Instruction Manual SEL-351A Relay
Figure 4.13 Wattmetric and Incremental Conductance Directional Elements
(Petersen Coil Grounded Systems)................................................................................... 4.25
Figure 4.14 Zero-Sequence Voltage-Polarized Directional Element (Ungrounded/High-Impedance
Grounded Systems)........................................................................................................... 4.26
Figure 4.15 Routing of Directional Elements to Residual-Ground Overcurrent Elements..................... 4.27
Figure 4.16 Routing of Direction Elements to Neutral-Ground Overcurrent Elements.......................... 4.27
Figure 4.17 Direction Forward/Reverse Logic for Residual-Ground Overcurrent Elements.................. 4.28
Figure 4.18 Direction Forward/Reverse Logic for Neutral-Ground Overcurrent Elements.................... 4.29
Figure 4.19 General Logic Flow of Directional Control for Negative-Sequence
and Phase Overcurrent Elements ...................................................................................... 4.30
Figure 4.20 Negative-Sequence Voltage-Polarized Directional Element for Negative-Sequence
and Phase Overcurrent Elements ...................................................................................... 4.33
Figure 4.21 Positive-Sequence Voltage-Polarized Directional
Element for Phase Overcurrent Elements......................................................................... 4.34
Figure 4.22 Routing of Directional Elements to Negative-Sequence and Phase Overcurrent Elements. 4.35
Figure 4.23 Direction Forward/Reverse Logic for Negative-Sequence Overcurrent Elements .............. 4.36
Figure 4.24 Direction Forward/Reverse Logic for Phase Overcurrent Elements .................................... 4.37
Figure 4.25 Zero-Sequence Impedance Network and Relay Polarity ..................................................... 4.47
Figure 4.26 Zero-Sequence Impedance Plot for Solidly-Grounded, Mostly Inductive System.............. 4.47
Figure 4.27 Zero-Sequence Impedance Network for Ground Fault on Feeder ....................................... 4.51
Figure 4.28 Wattmetric Element Operation for Ground Fault on Feeder ................................................ 4.52
Figure 5.1 Trip Logic............................................................................................................................... 5.2
Figure 5.2 Minimum Trip Duration Timer Operation (See Bottom of Figure 5.1)................................. 5.3
Figure 5.3 Three-Pole Open Logic (Top) and Switch-Onto-Fault Logic (Bottom)................................. 5.7
Figure 5.4 Seal-in of Breaker Failure Occurrence for Message Display............................................... 5.13
Figure 6.1 Close Logic ............................................................................................................................ 6.2
Figure 6.2 Reclose Supervision Logic (Following Open Interval Time-Out) ......................................... 6.5
Figure 6.3 Reclose Supervision Limit Timer Operation (Refer to Bottom of Figure 6.2) ...................... 6.6
Figure 6.4 SEL-351A Relays Installed at Both Ends of a Transmission Line
in a High-Speed Reclose Scheme....................................................................................... 6.9
Figure 6.5 Reclosing Relay States and General Operation.................................................................... 6.13
Figure 6.6 Reclosing Sequence From Reset to Lockout With Example Settings.................................. 6.16
Figure 6.7 Reclose Blocking for Islanded Generator ............................................................................ 6.24
Figure 6.8 Sequence Coordination Between the SEL-351A and a Line Recloser ................................ 6.27
Figure 6.9 Operation of SEL-351A Shot Counter for Sequence Coordination
With Line Recloser (Additional Settings Example 1) ...................................................... 6.27
Figure 6.10 Operation of SEL-351A Shot Counter for Sequence Coordination
With Line Recloser (Additional Settings Example 2) ...................................................... 6.29
Figure 7.1 Example Operation of Optoisolated Inputs IN101–IN106 .................................................... 7.2
Figure 7.2 Circuit Breaker Auxiliary Contact and Reclose Enable Switch
Connected to Optoisolated Inputs IN101 and IN102 ......................................................... 7.3
Figure 7.3 Local Control Switches Drive Local Bits LB1–LB16 ........................................................... 7.5
Figure 7.4 Local Control Switch Configured as an ON/OFF Switch...................................................... 7.6
Figure 7.5 Local Control Switch Configured as an OFF/MOMENTARY Switch .................................. 7.6
Figure 7.6 Local Control Switch Configured as an ON/OFF/MOMENTARY Switch ........................... 7.6
Figure 7.7 Configured Manual Trip Switch Drives Local Bit LB3......................................................... 7.7
Figure 7.8 Configured Manual Close Switch Drives Local Bit LB4....................................................... 7.7
Figure 7.9 Remote Control Switches Drive Remote Bits RB1–RB16 .................................................... 7.9
Figure 7.10 Traditional Latching Relay................................................................................................... 7.11
Figure 7.11 Latch Control Switches Drive Latch Bits LT1–LT16........................................................... 7.11
Figure 7.12 SCADA Contact Pulses Input IN104 to Enable/Disable Reclosing Relay .......................... 7.12
Figure 7.13 Latch Control Switch Controlled by a Single Input to Enable/Disable Reclosing .............. 7.12
Figure 7.14 Latch Control Switch Operation Time Line......................................................................... 7.14
Figure 7.15 Time Line for Reset of Latch Bit LT2 After Active Setting Group Change ........................ 7.15
Figure 7.16 Latch Control Switch (With Time Delay Feedback) Controlled
by a Single Input to Enable/Disable Reclosing ................................................................ 7.16
Figure 7.17 Latch Control Switch (With Time Delay Feedback) Operation Time Line ......................... 7.17
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