Schweitzer Engineering Laboratories SEL-351A - Figure 8.11 Response of Thermal and Rolling Demand Meters to a Step Input (Setting DMTC = 15 Minutes)

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8.21

Date Code 20080213 Instruction Manual SEL-351A Relay

Breaker Monitor and Metering

Demand Metering

Figure 8.11 Response of Thermal and Rolling Demand Meters to a Step Input

(setting DMTC = 15 minutes)

Thermal Demand Meter Response (EDEM = THM)

The response of the thermal demand meter in Figure 8.11 (middle) to the step

current input (top) is analogous to the series RC circuit in Figure 8.12.

Thermal Demand

Meter Response

(EDEM = THM)

Thermal Demand Current (per unit)

051015

0.5

0.9

1.0

Time

(Minutes)

Rolling Demand

Meter Response

(EDEM = ROL)

Rolling Demand Current (per unit)

DMTC = 15 minutes

051015

.33

.67

1.0

Time

(Minutes)

Step Current

Input

Instantaneous Current (per unit)

051015

0.5

1.0

Time

(Minutes)

Courtesy of NationalSwitchgear.com

Main Page

Default Chapter3
- Table of Contents3
List of Tables7
List of Figures11
Preface17
Section 1: Introduction and Specifications17
- Overview17
- SEL-351A Models22
- Table 1.1 SEL-351A Models22
- Table 1.2 SEL-351A-1 Models22
- Table 1.3 Major Differences-SEL-351, SEL-351A, and SEL-351A-123
- Applications26
- Figure 1.1 SEL-351A Relays Applied Throughout the Power System26
- Hardware Connection Features27
- Figure 1.2 SEL-351A Inputs, Outputs, and Communications Ports28
- Communications Connections29
- Figure 1.3 SEL-351A Communications Connections Examples29
- Specifications30
Section 2: Installation35
- Overview35
- Relay Mounting36
- Figure 2.1 SEL-351A Dimensions for Rack-Mount and Panel-Mount Models37
- Front-Panel and Rear-Panel Connection Diagrams38
- Figure 2.2 SEL-351A Rear-Panel Diagram-Conventional Terminal Blocks, Horizontal Example39
- Figure 2.3 SEL-351A Front-Panel Drawings (Rack Mount Relays)40
- Figure 2.4 SEL-351A Front-Panel Drawings (Panel-Mount Relays)41
- 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)42
- Figure 2.6 SEL-351A Rear-Panel Drawings-Connectorized Models 0351A0WH, 0351A0W3, or 0351A0W5 (Horizontal) and 0351A0W4 (Vertical)43
- Making Rear-Panel Connections44
- Figure 2.7 SEL-351A Plug-In Connector Coding (Top View; Model 0351A0W)45
- Figure 2.8 Broken-Delta Secondary Connection to Voltage Input VS, Wye-Connected Pts50
- Figure 2.10 Broken-Delta Secondary Connection to Voltage Input VS, Open-Delta Connected Pts51
- Figure 2.9 Resultant Voltage V S52
- Figure 2.11 Resultant Voltage52
- Table 2.1 Communications Cables to Connect the SEL-351A to Other Devices53
- SEL-351A AC/DC Connection Diagrams for Various Applications54
- Figure 2.12 SEL-351A Provides Overcurrent Protection and Reclosing for a Utility Distribution Feeder (Includes Fast Bus Trip Scheme) (Wye-Connected Pts)54
- Figure 2.13 SEL-351A Provides Overcurrent Protection for a Distribution Bus (Includes Fast Bus Trip Scheme) (Wye-Connected Pts)55
- Figure 2.14 SEL-351A Provides Directional Overcurrent Protection and Reclosing for a Transmission Line (Wye-Connected Pts)56
- Figure 2.16 SEL-351A Provides Overcurrent Protection for a Delta-Wye Transformer Bank (Wye-Connected Pts)58
- Figure 2.17 SEL-351A Provides Overcurrent Protection for a Transformer Bank with a Tertiary Winding (Wye-Connected Pts)59
- Figure 2.18 SEL-351A Provides Overcurrent Protection for an Industrial Distribution Feeder (Core-Balance Current Transformer Connected to Channel IN)60
- Figure 2.19 SEL-351A Provides Dedicated Breaker Failure Protection61
- Figure 2.20 SEL-351A Provides Overcurrent Protection for a High-Impedance or Low-Impedance Grounded System (Wye-Connected Pts)62
- Figure 2.21 SEL-351A Provides Overcurrent Protection for a Petersen Coil Grounded System (Wye-Connected Pts)63
- Figure 2.22 SEL-351A Provides Overcurrent Protection for an Ungrounded System (Wye-Connected Pts)64
- Figure 2.23 SEL-351A Provides Overcurrent Protection for an Ungrounded System (Open-Delta Connected Pts, Broken-Delta 3V0 Connection)65
- 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)66
- Figure 2.25 SEL-351A Provides Underfrequency Load Shedding, Overcurrent Protection, and Reclosing for a Utility Distribution Feeder (Single Voltage Connection)67
- Circuit Board Connections68
- Figure 2.26 Jumper, Connector, and Major Component Locations on the SEL-351A Main Board69
- Table 2.2 Output Contact Jumpers and Corresponding Output Contacts70
- Table 2.3 "Extra Alarm" Output Contacts and Corresponding Controlling Jumpers70
- Table 2.4 Required Position of Jumper JMP23 for Desired Output Contact OUT107 Operation70
- Table 2.5 Password and Breaker Jumper Positions for Standard Relay Shipments71
- Table 2.6 Password and Breaker Jumper Operation71
- Table 2.7 EIA-232 Serial Port Voltage Jumper Positions for Standard Relay Shipments71
- Figure 3.1 Levels 1 through 4 Phase Instantaneous Overcurrent Elements74
- Figure 3.2 Levels 5 through 6 Phase Instantaneous Overcurrent Elements74
- Figure 3.3 Levels 1 through 4 Phase Instantaneous/Definite-Time Overcurrent Elements (with Directional Control Option) (Not in SEL-351A-1)76
Section 3: Overcurrent, Voltage, Synchronism Check, and Frequency Elements Instantaneous/Definite-Time Overcurrent Elements78
- Figure 3.4 Combined Single-Phase Instantaneous Overcurrent Elements78
- Figure 3.5 SEL-351A Nondirectional Instantaneous Overcurrent Element Pickup Time Curve79
- Figure 3.6 SEL-351A Nondirectional Instantaneous Overcurrent Element Reset Time Curve79
- Figure 3.7 Levels 1 through 4 Phase-To-Phase Instantaneous Overcurrent Elements81
- Figure 3.8 Levels 1 through 4 Neutral-Ground Instantaneous Overcurrent Elements (with Directional Control and Definite-Time Elements in SEL-351A)82
- Figure 3.9 Levels 5 through 6 Neutral-Ground Instantaneous Overcurrent Elements82
- Figure 3.10 Levels 1 through 4 Residual-Ground Instantaneous Overcurrent Elements (with Directional Control and Definite-Time Elements in SEL-351A)84
- Figure 3.11 Levels 5 through 6 Residual-Ground Instantaneous Overcurrent Elements84
- Figure 3.12 Levels 1 through 4 Negative-Sequence Instantaneous Overcurrent Elements (with Directional Control and Definite-Time Elements in SEL-351A)87
- Figure 3.13 Levels 5 through 6 Negative-Sequence Instantaneous Overcurrent Elements87
- Table 3.1 Available Phase Time-Overcurrent Elements88
- Table 3.2 Phase Time-Overcurrent Element (Maximum Phase) Settings88
- Time-Overcurrent Elements88
- Table 3.3 Phase Time-Overcurrent Element (Maximum Phase) Logic Outputs89
- Figure 3.15 A-Phase Time-Overcurrent Element 51AT (with Directional Control Option in SEL-351A)93
- Figure 3.16 B-Phase Time-Overcurrent Element 51BT (with Directional Control Option in SEL-351A)93
- Figure 3.17 C-Phase Time-Overcurrent Element 51CT (with Directional Control Option in SEL-351A)94
- Figure 3.18 Neutral-Ground Time-Overcurrent Element 51NT (with Directional Control Option in SEL-351A)94
- Table 3.4 Neutral-Ground Time-Overcurrent Element Settings95
- Figure 3.19 Residual-Ground Time-Overcurrent Element 51GT (with Directional Control Option in SEL-351A)96
- Table 3.5 Available Residual-Ground Time-Overcurrent Elements96
- Table 3.6 Residual-Ground Time-Overcurrent Element 51GT Settings96
- Figure 3.20 Residual-Ground Time-Overcurrent Element 51G2T (with Directional Control Option)97
- Table 3.7 Residual-Ground Time-Overcurrent Element 51G2T Settings97
- Figure 3.21 Negative-Sequence Time-Overcurrent Element 51QT (with Directional Control Option in SEL-351A)98
- Table 3.8 Negative-Sequence Time-Overcurrent Element Settings99
- Table 3.10 Voltage Elements Settings and Settings Ranges (Wye-Connected Pts)100
- Table 3.9 Voltage Values Used by Voltage Elements100
- Voltage Elements100
- Table 3.11 Voltage Elements Settings and Settings Ranges (VS Channel)101
- Table 3.12 Voltage Elements Settings and Settings Ranges (Delta-Connected Pts)101
- Figure 3.22 Single-Phase and Three-Phase Voltage Elements (Wye-Connected Pts)103
- Figure 3.23 Phase-To-Phase and Sequence Voltage Elements (Wye-Connected Pts)104
- Figure 3.24 Phase-To-Phase Voltage Elements (Delta-Connected Pts)105
- Figure 3.25 Sequence Voltage Elements (Delta-Connected Pts)105
- Figure 3.26 Channel VS Voltage Elements (Wye- or Delta-Connected Pts)106
- Synchronism Check Elements (Not in SEL-351A-1)108
- Table 3.13 Synchronism Check Elements Settings and Settings Ranges108
- Figure 3.27 Synchronism Check Voltage Window and Slip Frequency Elements110
- Figure 3.28 Synchronism Check Elements111
- Figure 3.29 Angle Difference between V117
- Figure 3.30 Undervoltage Block for Frequency Elements (Group Setting VNOM ≠ OFF)121
- Frequency Elements121
- Figure 3.32 Levels 1 through 6 Frequency Elements122
- Table 3.14 Frequency Elements Settings and Settings Ranges123
- Figure 4.1 Loss-Of-Potential Logic127
Section 4: Loss-Of-Potential, Load Encroachment, and Directional Element Logic Loss-Of-Potential Logic (Not in the SEL-351A-1)128
- Load-Encroachment Logic (Not in SEL-351A-1)130
- Figure 4.2 Load-Encroachment Logic130
- Figure 4.3 Migration of Apparent Positive-Sequence Impedance for a Fault Condition133
- Directional Control for Neutral-Ground and Residual-Ground Overcurrent Elements (Not in SEL-351A-1)135
- Figure 4.4 General Logic Flow of Directional Control for Neutral-Ground and Residual-Ground Overcurrent Elements (Excluding Ungrounded/High-Impedance Grounded Systems)136
- Table 4.1 Available Ground Directional Elements137
- Figure 4.5 General Logic Flow of Directional Control for Neutral-Ground and Residual-Ground Overcurrent Elements (Ungrounded/High-Impedance Grounded Systems; ORDER137
- Table 4.2 Best Choice Ground Directional Element™ Logic138
- Table 4.3 Ground Directional Element Availability by Voltage Connection Settings139
- Figure 4.6 Internal Enables (32QE and 32QGE) Logic for Negative-Sequence Voltage-Polarized Directional Elements144
- Figure 4.7 Internal Enables (32VE and 32IE) Logic for Zero-Sequence Voltage-Polarized and Channel in Current-Polarized Directional Elements145
- Figure 4.8 Internal Enable (32NE) Logic for Zero-Sequence Voltage-Polarized Directional Elements (Low-Impedance Grounded, Petersen Coil Grounded, and Ungrounded/High-Impedance Grounded Systems)146
- Figure 4.9 Negative-Sequence Voltage-Polarized Directional Element for Neutral-Ground and Residual-Ground Overcurrent Elements147
- Figure 4.10 Zero-Sequence Voltage-Polarized Directional Element148
- Figure 4.11 Channel in Current-Polarized Directional Element149
- Figure 4.12 Zero-Sequence Voltage-Polarized Directional Element (Low-Impedance Grounded Systems)150
- Figure 4.13 Wattmetric and Incremental Conductance Directional Elements (Petersen Coil Grounded Systems)151
- Figure 4.14 Zero-Sequence Voltage-Polarized Directional Element (Ungrounded/High-Impedance Grounded Systems)152
- Figure 4.15 Routing of Directional Elements to Residual-Ground Overcurrent Elements153
- Figure 4.16 Routing of Direction Elements to Neutral-Ground Overcurrent Elements153
- Figure 4.17 Direction Forward/Reverse Logic for Residual-Ground Overcurrent Elements154
- Figure 4.18 Direction Forward/Reverse Logic for Neutral-Ground Overcurrent Elements155
- Directional Control for Negative-Sequence and Phase Overcurrent Elements (Not in SEL-351A-1)156
- Figure 4.19 General Logic Flow of Directional Control for Negative-Sequence and Phase Overcurrent Elements156
- Figure 4.20 Negative-Sequence Voltage-Polarized Directional Element for Negative-Sequence and Phase Overcurrent Elements159
- Figure 4.21 Positive-Sequence Voltage-Polarized Directional Element for Phase Overcurrent Elements160
- Figure 4.22 Routing of Directional Elements to Negative-Sequence and Phase Overcurrent Elements161
- Figure 4.23 Direction Forward/Reverse Logic for Negative-Sequence Overcurrent Elements162
- Figure 4.24 Direction Forward/Reverse Logic for Phase Overcurrent Elements163
- Directional Control Settings (Not in SEL-351A-1)164
- Table 4.4 Overcurrent Elements Controlled by Level Direction Settings DIR1-DIR4 (Corresponding Overcurrent Element Figure Numbers in Parentheses)165
- Figure 4.25 Zero-Sequence Impedance Network and Relay Polarity173
- Figure 4.26 Zero-Sequence Impedance Plot for Solidly-Grounded, Mostly Inductive System173
- Figure 4.27 Zero-Sequence Impedance Network for Ground Fault on Feeder177
- Figure 4.28 Wattmetric Element Operation for Ground Fault on Feeder178
- Table 4.5 Affect of Global Settings VSCONN and PTCONN on Petersen Coil Directional Elements181
- Directional Control Provided by Torque Control Settings (Not in SEL-351A-1)183
Section 5: Trip and Target Logic Trip Logic186
- Figure 5.1 Trip Logic186
- Figure 5.2 Minimum Trip Duration Timer Operation (See Bottom of Figure 5.1)187
- Figure 5.3 Three-Pole Open Logic (Top) and Switch-Onto-Fault Logic (Bottom)191
- Switch-Onto-Fault (SOTF) Trip Logic191
- Front-Panel Target LEDS194
- Table 5.1 SEL-351A Front-Panel Target LED Definitions194
- Figure 5.4 Seal-In of Breaker Failure Occurrence for Message Display197
Section 6: Close and Reclose Logic199
- Overview199
- Close Logic200
- Figure 6.1 Close Logic200
- Reclose Supervision Logic203
- Figure 6.2 Reclose Supervision Logic (Following Open Interval Time-Out)203
- Figure 6.3 Reclose Supervision Limit Timer Operation (Refer to Bottom of Figure 6.2)204
- Figure 6.4 SEL-351A Relays Installed at both Ends of a Transmission Line in a High-Speed Reclose Scheme207
- Reclosing Relay210
- Table 6.1 Relay Word Bit and Front-Panel Correspondence to Reclosing Relay States211
- Figure 6.5 Reclosing Relay States and General Operation211
- Table 6.2 Reclosing Relay Timer Settings and Setting Ranges213
- Figure 6.6 Reclosing Sequence from Reset to Lockout with Example Settings214
- Table 6.3 Shot Counter Correspondence to Relay Word Bits and Open Interval Times216
- Table 6.4 Reclosing Relay SEL OGIC Control Equation Settings217
- Table 6.5 Example Open Interval Time Settings222
- Figure 6.7 Reclose Blocking for Islanded Generator222
- Figure 6.8 Sequence Coordination between the SEL-351A and a Line Recloser225
- Figure 6.9 Operation of SEL-351A Shot Counter for Sequence Coordination225
Section 7: Inputs, Outputs, Timers, and Othercontrol Logic229
- Overview229
- Optoisolated Inputs230
- Figure 7.1 Example Operation of Optoisolated Inputs IN101-IN106230
- Figure 7.2 Circuit Breaker Auxiliary Contact and Reclose Enable Switch Connected to Optoisolated Inputs IN101 and IN102231
- Local Control Switches (Only on Models with LCD)233
- Table 7.1 Correspondence between Local Control Switch Positions and Label Settings233
- Figure 7.3 Local Control Switches Drive Local Bits LB1-LB16233
- Table 7.2 Correspondence between Local Control Switch Types and Required Label Settings234
- Figure 7.4 Local Control Switch Configured as an ON/OFF Switch234
- Figure 7.5 Local Control Switch Configured as an OFF/MOMENTARY Switch234
- Figure 7.6 Local Control Switch Configured as an ON/OFF/MOMENTARY Switch234
- Figure 7.7 Configured Manual Trip Switch Drives Local Bit LB3235
- Figure 7.8 Configured Manual Close Switch Drives Local Bit LB4235
- Remote Control Switches237
- Figure 7.9 Remote Control Switches Drive Remote Bits RB1-RB16237
- Latch Control Switches239
- Figure 7.10 Traditional Latching Relay239
- Figure 7.11 Latch Control Switches Drive Latch Bits LT1-LT16239
- Figure 7.12 SCADA Contact Pulses Input IN104 to Enable/Disable Reclosing Relay240
- Figure 7.13 Latch Control Switch Controlled by a Single Input to Enable/Disable Reclosing240
- Figure 7.14 Latch Control Switch Operation Time Line242
- Figure 7.15 Time Line for Reset of Latch Bit LT2 after Active Setting Group Change243
- Figure 7.16 Latch Control Switch (with Time Delay Feedback) Controlled by a Single Input to Enable/Disable Reclosing244
- Figure 7.17 Latch Control Switch (with Time Delay Feedback) Operation Time Line245
- Multiple Setting Groups246
- Table 7.3 Definitions for Active Setting Group Indication Relay Word Bits SG1 through SG6246
- Table 7.4 Definitions for Active Setting Group Switching246
- Table 7.5 SEL OGIC Control Equation Settings for Switching Active Setting Group between Setting Groups 1 and248
- Figure 7.18 SCADA Contact Pulses Input IN105 to Switch Active Setting Group between Setting Groups 1 and248
- Figure 7.19 SEL OGIC Control Equation Variable Timer SV8T Used in Setting Group Switching248
- Table 7.6 Active Setting Group Switching Input Logic250
- Figure 7.20 Active Setting Group Switching (with Single Input) Time Line250
- Figure 7.21 Rotating Selector Switch Connected to Inputs IN101, IN102, and IN103 for Active Setting Group Switching251
- Figure 7.22 Active Setting Group Switching (with Rotating Selector Switch) Time Line253
- SEL OGIC Control Equation Variables/Timers255
- Figure 7.25 Dedicated Breaker Failure Scheme Created with SEL Control Equation Variables/Timers257
- Output Contacts259
- Figure 7.26 Logic Flow for Example Output Contact Operation261
- Rotating Default Display (Only on Models with LCD)262
- Figure 7.27 Traditional Panel Light Installations262
- Figure 7.28 Rotating Default Display Replaces Traditional Panel Light Installations263
- Table 7.8 Mnemonic Settings for Metering on the Rotating Default Display269
Section 8: Breaker Monitor and Metering272
- Table 7.9 Mnemonic Settings for Breaker Wear Monitor Values on the Rotating Default Display273
Section 9: Setting the Relay311
- Overview311
- Table 9.1 Serial Port SET Commands311
- Settings Changes Via the Front Panel (Only on Models with LCD)312
- Settings Changes Via the Serial Port312
- Table 9.2 Set Command Editing Keystrokes312
- Time-Overcurrent Curves314
- Table 9.3 Equations Associated with U.S. Curves314
- Table 9.4 Equations Associated with IEC Curves314
- Figure 9.1 U.S. Moderately Inverse Curve: U1316
- Figure 9.2 U.S. Inverse Curve: U2317
- Figure 9.3 U.S. very Inverse Curve: U3318
- Figure 9.4 U.S. Extremely Inverse Curve: U4319
- Figure 9.5 U.S. Short-Time Inverse Curve: U5320
- Figure 9.6 I.E.C. Class a Curve (Standard Inverse): C1321
- Figure 9.7 I.E.C. Class B Curve (very Inverse): C2322
- Figure 9.8 I.E.C. Class C Curve (Extremely Inverse): C3323
- Figure 9.9 I.E.C. Long-Time Inverse Curve: C4324
- Figure 9.10 I.E.C. Short-Time Inverse Curve: C5325
- Relay Word Bits (Used in SEL OGIC Control Equations)326
- Table 9.5 SEL-351A Relay Word Bits326
- Table 9.6 Relay Word Bit Definitions for SEL-351A328
- Settings Explanations344
- Table 9.7 Main Relay Functions that Change with VSCONN, When PTCONN = WYE347
- Table 9.8 Main Relay Functions that Change with VSCONN, When PTCONN = DELTA348
- Table 9.9 Main Relay Functions that Change with VNOM = off348
- Figure 9.11 Operation of DELTA and 3V0 Relay Word Bits348
- Figure 9.12 Hybrid Power System with Neutral-Ground Resistor350
- Settings Sheets352
SEL-351A Settings Sheets353
SEL-351A-1 Settings Sheets385
Section 10: Serial Port Communications and Commands411
- Overview411
- Table 10.1 SEL-351A Available Serial Ports411
- Port Connector and Communications Cables412
- Table 10.2 Pinout Functions for EIA-232 Serial Ports 2, 3, and412
- Table 10.3 Terminal Functions for EIA-485 Serial Port 1412
- Figure 10.1 DB-9 Connector Pinout for EIA-232 Serial Ports412
- Table 10.4 Serial Communications Port Pin/Terminal Function Definitions414
- Communications Protocol416
- Serial Port Automatic Messages419
- Table 10.5 Serial Port Automatic Messages419
- Serial Port Access Levels420
- Command Summary422
- Table 10.6 Serial Port Command Summary422
- Command Explanations424
- Table 10.7 SEL-351A Word and Its Correspondence to TAR Command441
- Table 10.8 SEL-351A Control Subcommands447
- Table 10.9 Valid Password Characters448
SEL-351A Command Summary451
Section 11: Front-Panel Interface (Only on Models with LCD)455
- Overview455
- Front-Panel Pushbutton Operation456
- Figure 11.1 Front-Panel Pushbuttons-Overview456
- Figure 11.2 Front-Panel Pushbuttons-Primary Functions457
- Figure 11.3 Front-Panel Pushbuttons-Primary Functions (Continued)458
- Figure 11.4 Front-Panel Pushbuttons-Secondary Functions459
- Functions Unique to the Front-Panel Interface460
- Figure 11.5 Local Control Switch Configured as an ON/OFF Switch462
- Figure 11.6 Local Control Switch Configured as an OFF/MOMENTARY Switch462
- Figure 11.7 Local Control Switch Configured as an ON/OFF/MOMENTARY Switch462
- Rotating Default Display466
Section 12: Standard Event Reports and SER473
- Overview473
- Standard 15/30-Cycle Event Reports474
- Figure 12.1 Example Event Summary476
- Table 12.1 Event Types477
- Figure 12.2 Example Synchrophasor-Level Precise Event Report 1/16-Cycle Resolution480
- Table 12.2 Standard Event Report Current, Voltage, and Frequency Columns481
- Table 12.3 Output, Input, and Protection, and Control Element Event Report Columns484
- Sequential Events Recorder (SER) Report493
- Example Standard 15-Cycle Event Report496
- Figure 12.4 Example Partial Event Report with Delta-Connected Pts499
- Figure 12.5 Derivation of Event Report Current Values and RMS Current Values from Sampled Current Waveform500
- Figure 12.6 Derivation of Phasor RMS Current Values from Event Report Current Values501
- Example Sequential Events Recorder (SER) Report502
- Figure 12.7 Example Sequential Events Recorder (SER) Event Report502
Section 13: Testing and Troubleshooting505
- Overview505
- Testing Philosophy506
- Testing Methods and Tools509
- Table 13.1 Test Features Provided by the Relay509
- Table 13.2 Resultant Scale Factors for Input Module510
- Figure 13.1 Low-Level Test Interface (J1 or J10) Connector510
- Relay Self-Tests513
- Table 13.3 Relay Self-Tests513
- Relay Troubleshooting515
- Relay Calibration517
- Factory Assistance518
- Table A.1 SEL-351A Firmware Revision History519
Appendix A: Firmware and Manual Versions Firmware520
- Table A.2 SEL-351A-1 Firmware Revision History523
- Table A.3 Instruction Manual Revision History525
Appendix B: Firmware Upgrade Instructions535
- Overview535
- Relay Firmware Upgrade Instructions536
- Figure B.1 Establishing a Connection538
- Figure B.2 Determining the Computer Serial Port538
- Figure B.3 Determining Communications Parameters for the Computer539
- Figure B.4 Setting Terminal Emulation539
- Figure B.5 Terminal Emulation Startup Prompt540
- Figure B.6 Correcting the Port Setting540
- Figure B.7 Correcting the Communications Parameters541
- Figure B.8 Preparing Hyperterminal for ID Command Display542
- Figure B.9 List of Commands Available in SEL543
- Figure B.10 Matching Computer to Relay Parameters544
- Figure B.11 Example Receive File Dialog Box545
- Figure B.12 Example Filename Identifying Old Firmware Version545
- Figure B.13 Downloading Old Firmware545
- Figure B.14 Selecting New Firmware to Send to the Relay547
- Figure B.15 Transferring New Firmware to the Relay547
- Table B.1 Troubleshooting New Firmware Upload548
Appendix C: SEL Distributed Port Switch Protocol559
- Overview559
- Settings560
- Operation561
Appendix D: Configuration, Fast Meter, and Fast Operate Commands563
- Overview563
- Message Lists564
- Table D.1 Binary Message List564
- Table D.2 ASCII Configuration Message List564
  - Message Definitions565
- Table D.3 A5C0 Relay Definition Block565
- Table D.4 A5C1 Fast Meter Configuration Block565
- Table D.5 A5D1 Fast Meter Data Block567
- Table D.6 A5C2/A5C3 Demand/Peak Demand Fast Meter Configuration Messages567
- Table D.7 A5D2/A5D3 Demand/Peak Demand Fast Meter Message570
- Table D.8 A5CE Fast Operate Configuration Block571
- Table D.9 A5E0 Fast Operate Remote Bit Control572
- Table D.10 A5E3 Fast Operate Breaker Control573
- Table D.11 A5CD Fast Operate Reset Definition Block573
- Table D.12 A5ED Fast Operate Reset Command574
Appendix E: Compressed ASCII Commands577
- Overview577
- CASCII Command-General Format578
- CASCII Command-SEL-351A580
- CSTATUS Command-SEL-351A581
- CHISTORY Command-SEL-351A582
- CEVENT Command-SEL-351A583
- Table E.1 Mapping Labels to Bits585
Appendix F: Setting Negative-Sequence Overcurrent Elements587
- Setting Negative-Sequence Definite-Time Overcurrent Elements587
- Setting Negative-Sequence Time-Overcurrent Elements588
- Figure F.1 Minimum Response Time Added to a Negative-Sequence Time-Overcurrent Element 51QT588
- Coordinating Negative-Sequence Overcurrent Elements589
- Figure F.2 Distribution Feeder Protective Devices590
- Figure F.3 Traditional Phase Coordination590
- Figure F.4 Phase-To-Phase Fault Coordination591
- Figure F.5 Negative-Sequence Overcurrent Element Derived from "Equivalent" Phase Overcurrent Element, 51EP592
- Other Negative-Sequence Overcurrent Element References594
Appendix G: Setting SEL OGIC Control Equations595
- Overview595
- Relay Word Bits596
- SEL OGIC Control Equations598
- Figure G.1 Result of Rising-Edge Operators on Individual Elements in Setting er601
- Figure G.2 Result of Falling-Edge Operator on a Deasserting Underfrequency Element602
- Table G.2 SEL OGIC Control Equation Settings Limitations604
  - Processing Order and Processing Interval606
- Table G.3 Processing Order of Relay Elements and Logic (Top to Bottom)606
Appendix H: Distributed Network Protocol609
- Overview609
- Configuration610
- Table H.1 Settings to Configure a Port for DNP610
- Table H.2 Settings to Configure a Port for Extended Mode DNP610
- Table H.3 Data Access Methods614
  - Device Profile615
- Table H.4 SEL-351A DNP3 Device Profile615
  - Object Table617
- Table H.5 SEL-351A DNP Object Table617
  - Data Map622
- Table H.6 SEL-351A DNP Data Map622
- Table H.7 Analog 105 Upper-Byte Definitions625
- Table H.8 Analog 105 Lower-Byte Definitions625
- Table H.9 Control Field625
  - Point Remapping628
DNP Settings Sheets629
SET: Appendix I: Using the SEL-251 and SEL-267 Relay Settings in the SEL-351A Relay631
Appendix Jsel-351A Fast SER Protocol637
- Overview637
- Make Sequential Events Recorder (SER) Settings with Care638
- Recommended Message Usage639
- Functions and Function Codes640
- Table J.3 Message Format for Function Code 18641
- Table J.4 Message if SER Records Are Lost642
- Table J.5 Acknowledge Message Format643
- AC SEL ERATOR Quickset SEL-5030 Software646
Appendix K: ACSELERATOR Quickset SEL-5030 Software646
- AC SEL ERATOR Quickset System Requirements646
- Installation647
- Starting AC SEL ERATOR Quickset648
Appendix Lsel Synchrophasors649
- Overview649
- Introduction650
- Synchrophasor Measurement651
- Figure L.1 Phase Reference651
- External Equipment Compensation652
- Figure L.2 Waveform at Relay Terminals May Have Phase Shift652
- Figure L.3 Correction of Measured Phase Angle652
- Protocol Operation653
- Table L.1 SEL Fast Message Protocol Format653
- Table L.2 Unsolicited Fast Message Enable Packet654
- Table L.3 Unsolicited Fast Message Disable Packet654
- Table L.4 Permissible Message Periods Requested by Enable Message655
- Settings656
- Table L.5 SEL-351A Global Settings for Synchrophasors656
- Table L.6 SEL-351A Serial Port Settings for Synchrophasors656
- Synchrophasor Relay Word Bits659
- Table L.7 Time Synchronization Relay Word Bits659
- View Synchrophasors by Using the MET PM Command660
- Figure L.4 Sample MET PM Command Response661
- Communications Bandwidth662
- Table L.8 SEL Fast Message Voltage and Current Selections Based on PHDATAV and PHDATAI662

Schweitzer Engineering Laboratories SEL-351A - Figure 8.11 Response of Thermal and Rolling Demand Meters to a Step Input (Setting DMTC = 15 Minutes)

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