Sel SEL-351S Protection System Manuals

Table of Contents

4

List of Tables

8

List of Figures

12

Preface

18

Typographic Conventions

21

Cross References

21

Safety Information

22

Introduction and Specifications

24

SEL-351S Models

25

Table 1.1 SEL-351S Models

25

Table 1.2 SEL-351S Firmware Versions

26

Auxiliary {TRIP} and {CLOSE} Pushbuttons

26

CT Saturation Protection

26

Potential Transformer Connections

27

Applications

28

Figure 1.1 SEL-351S Relays Applied Throughout the Power System

28

Hardware Connection Features

29

Figure 1.2 Inputs, Outputs, and Communications Ports (Extra I/O Boards in Figure 1.3 and Figure 1.4)

29

Figure 1.3 Extra I/O Board (Model 0351Sxy, Plug-In Connector Version; Main Board Shown in Figure 1.2)

30

Figure 1.4 Extra I/O Board

31

Communications Connections

32

Figure 1.5 Communications Connections Examples

32

Specifications

33

Substation Battery Voltage Monitor

36

Metering Accuracy

36

Power Element Accuracy

37

Section 2: Installation

38

Relay Mounting

38

Rack Mount

38

Panel Mount

38

Figure 2.1 SEL-351S Dimensions for Rack-Mount and Panel-Mount Models

39

Front-Panel and Rear-Panel Connection Diagrams

40

Figure 2.2 SEL-351S Front- and Rear-Panel Drawings (Model 0351Sxyh3Xxxx6X); Horizontal Rack Mount Example, (Connectorized, with Additional I/O Board)

41

Figure 2.3 SEL-351S Front- and Rear-Panel Drawings (Model 0351Sx133Xxxx2X); Horizontal Panel Mount Example, (Conventional Terminal Blocks, with Additional I/O Board)

42

Figure 2.4 SEL-351S Front- and Rear-Panel Drawings (Model 0351Sx143Xxxxxx); Vertical Panel Mount Example, (Conventional Terminal Blocks, no Additional I/O Board)

43

Figure 2.5 SEL-351S with Auxiliary {TRIP}/{CLOSE} Pushbuttons (Model 0351Sx145Xxxx6X); Vertical Panel-Mount Example, (Conventional Terminal Blocks, with Additional I/O Board)

44

Figure 2.6 SEL-351S with Auxiliary {TRIP}/{CLOSE} Pushbuttons (Model 0351Sxyh5Xxxx2X); Horizontal Rack-Mount Example, (Connectorized, with Additional I/O Board)

45

User-Configurable Label Option for the Front Panel

46

Figure 2.7 SEL-351S (Horizontal) with User-Configurable Default Labels

46

Figure 2.8 SEL-351S (Horizontal) Blank Slide-In Label Set and Label Removal Tool

47

Figure 2.9 SEL-351S (Vertical) with User-Configurable Default Labels

48

Table 2.1 Options and Explanations for the User-Configurable Front-Panel Labels

50

Figure 2.11 Breaker LED Front-Panel Default Labels and Rear-Panel Labels

50

Making Rear-Panel Connections

51

Required Equipment/General Connection Information

51

Models 0351Sxy (Plug-In Connectors)

51

Figure 2.12 SEL-351S Plug-In Connector Coding (Top View; Model 0351Sxy)

52

Chassis Ground

53

Power Supply

53

Standard Output Contacts

54

High-Current Interrupting Output Contacts

54

Current Transformer Inputs

55

Model 0351Sxy

55

Potential Transformer Inputs

55

Voltage Input Rating

56

Wye-Connected Voltages (Global Setting PTCONN = WYE)

56

Delta-Connected Voltages (Global Setting PTCONN = DELTA)

56

Synchronism Check VS Connection (Global Setting VSCONN = VS)

57

Broken-Delta VS Connection (Global Setting VSCONN = 3V0)

57

Polarity Check for VSCONN = 3V0

57

Wye-Connected PT Example

58

Figure 2.13 Broken-Delta Secondary Connection to Voltage Input VS, Wye-Connected Pts

58

Figure 2.14 Resultant Voltage V

59

Figure 2.15 Broken-Delta Secondary Connection to Voltage Input VS, Open-Delta Connected Pts

59

Figure 2.16 Resultant Voltage V

60

Serial Ports

60

Table 2.2 Communication Cables to Connect the SEL-351S to Other Devices

61

IRIG-B Time-Code

61

SEL-351S AC/DC Connection Diagrams for Various Applications

62

Figure 2.17 SEL-351S Provides Overcurrent Protection and Reclosing for a Utility Distribution Feeder (Includes Fast Bus Trip Scheme) (Wye-Connected Pts)

62

Figure 2.18 SEL-351S Provides Overcurrent Protection for a Distribution Bus (Includes Fast Bus Trip Scheme) (Wye-Connected Pts)

63

Figure 2.19 SEL-351S Provides Directional Overcurrent Protection and Reclosing for a Transmission Line (Wye-Connected Pts)

64

Figure 2.20 SEL-351S Provides Directional Overcurrent Protection and Reclosing for a Transmission Line (Current-Polarization Source Connected to Channel IN) (Wye-Connected Pts)

65

Figure 2.21 SEL-351S Provides Overcurrent Protection for a Delta-Wye Transformer Bank (Wye-Connected Pts)

66

Figure 2.22 SEL-351S Provides Overcurrent Protection for a Transformer Bank with a Tertiary Winding (Wye-Connected Pts)

67

Figure 2.23 SEL-351S Provides Overcurrent Protection for an Industrial Distribution Feeder (Core-Balance Current Transformer Connected to Channel IN)

68

Figure 2.24 SEL-351S Provides Dedicated Breaker Failure Protection

69

Figure 2.25 SEL-351S Provides Overcurrent Protection for a High-Impedance or Low-Impedance Grounded System (Wye-Connected Pts)

70

Figure 2.26 SEL-351S Provides Overcurrent Protection for a Petersen Coil Grounded System (Wye-Connected Pts)

71

Figure 2.27 SEL-351S Provides Overcurrent Protection for an Ungrounded System (Wye-Connected Pts)

72

Figure 2.28 SEL-351S Provides Overcurrent Protection for an Ungrounded System (Open-Delta Connected Pts, Broken-Delta 3V0 Connection)

73

Figure 2.29 SEL-351S Provides Overcurrent Protection and Reclosing for a Utility Distribution Feeder (Open-Delta Connected Pts and Line-To-Ground Synch-Check Connection)

74

Figure 2.30 SEL-351S Provides Underfrequency Load Shedding, Overcurrent Protection, and Reclosing for a Utility Distribution Feeder (Single Voltage Connection)

75

Figure 2.31 SEL-351S Example Wiring Diagram Using the Auxiliary {TRIP}/{CLOSE} Pushbuttons for 0351Sxxx5/6/A/B Models

76

Circuit Board Connections

77

Figure 2.32 Jumper, Connector, and Major Component Locations on the SEL-351S Main Board

78

Figure 2.33 Jumper, Connector, and Major Component Locations on the SEL-351Sxy Extra I/O Board (Plug-In Connector Version)

79

Figure 2.34 Jumper, Connector, and Major Component Locations on the SEL-351Sx1 Extra I/O Board (Screw Terminal Block Version)

80

Figure 2.35 Jumper Locations for the 0351Sxxx5/6/A/B Model Magnetics/Auxiliary Pushbutton

81

Output Contact Jumpers

81

Table 2.3 Output Contact Jumpers and Corresponding Output Contacts

82

Table 2.4 "Extra Alarm" Output Contacts and Corresponding Controlling Jumpers

82

Table 2.5 Required Position of Jumper JMP23 for Desired Output Contact OUT107 Operation (Models 0351Sx1, and 0351Sxy)

82

Table 2.6 Password and Breaker Jumper Positions for Standard Relay Shipments

83

Table 2.7 Password and Breaker Jumper Operation

83

Table 2.8 EIA-232 Serial Port Voltage Jumper Positions for Standard Relay Shipments

83

Auxiliary {TRIP}/ {CLOSE} Pushbutton and Breaker Status LED Jumpers (0351Sxxx5/6/A/B Models Only)

84

Table 2.9 Jumper Positions for Breaker OPEN/CLOSE Indication

84

Table 2.10 Jumper Positions for Arc Suppression

84

Clock Battery

84

Phase Instantaneous/Definite-Time Overcurrent Elements

86

Section 3: Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements Instantaneous/Definite-Time Overcurrent Elements

87

Figure 3.1 Levels 1-4 Phase Instantaneous Overcurrent Elements

87

Figure 3.2 Levels 5-6 Phase Instantaneous Overcurrent Elements

87

Pickup Operation

88

Figure 3.3 Levels 1-4 Phase Instantaneous/Definite-Time Overcurrent Elements

89

Figure 3.4 Combined Single-Phase Instantaneous Overcurrent Elements

91

Pickup and Reset Time Curves

91

Figure 3.5 SEL-351S Nondirectional Instantaneous Overcurrent Element Pickup Time Curve

92

Figure 3.6 SEL-351S Nondirectional Instantaneous Overcurrent Element Reset Time Curve

92

Setting Range

92

Neutral Ground Instantaneous/Definite-Time Overcurrent Elements

93

Figure 3.7 Levels 1-4 Phase-To-Phase Instantaneous Overcurrent Elements

94

Figure 3.8 Levels 1-4 Neutral Ground Instantaneous/Definite-Time Overcurrent Elements

95

Figure 3.9 Levels 5-6 Neutral Ground Instantaneous Overcurrent Elements

96

Residual Ground Instantaneous/Definite-Time Overcurrent Elements

96

Figure 3.10 Levels 1-4 Residual Ground Instantaneous/Definite-Time Overcurrent Elements

98

Figure 3.11 Levels 5-6 Residual Ground Instantaneous Overcurrent Elements

99

Negative-Sequence

99

Figure 3.12 Levels 1-4 Negative-Sequence Instantaneous/Definite-Time Overcurrent Elements

100

Figure 3.13 Levels 5-6 Negative-Sequence Instantaneous Overcurrent Elements

101

Time-Overcurrent Elements

102

Table 3.1 Available Phase Time-Overcurrent Elements

102

Table 3.2 Phase Time-Overcurrent Elements Settings

102

Figure 3.14 Phase Time-Overcurrent Element 51P1T (with Directional Control Option)

103

Figure 3.15 Phase Time-Overcurrent Element 51P2T (with Directional Control Option)

103

Table 3.3 Phase Time-Overcurrent Element (Maximum Phase) Logic Outputs

104

Torque Control Switch Open

104

Directional Control Option

105

Torque Control

105

Reset Timing Details (51P1T Element Example)

106

Figure 3.16 Neutral Ground Time-Overcurrent Element 51N1T (with Directional Control Option)

107

Table 3.4 Neutral Ground Time-Overcurrent Elements Settings

108

Figure 3.17 Neutral Ground Time-Overcurrent Element 51N2T (with Directional Control Option)

108

Residual Ground Time-Overcurrent Elements

109

Figure 3.18 Residual Ground Time-Overcurrent Element 51G1T (with Directional Control Option)

109

Table 3.5 Residual Ground Time-Overcurrent Elements Settings

110

Figure 3.19 Residual Ground Time-Overcurrent Element 51G2T (with Directional Control Option)

110

Table 3.6 Negative-Sequence Time-Overcurrent Elements Settings

111

Figure 3.20 Negative-Sequence Time-Overcurrent Element 51QT (with Directional Control Option)

111

Voltage Elements

113

Table 3.7 Voltage Values Used by Voltage Elements

113

Voltage Element Settings

113

Table 3.8 Voltage Elements Settings and Settings Ranges (Wye-Connected Pts)

114

Table 3.9 Voltage Elements Settings and Settings Ranges (VS Channel)

114

Table 3.10 Voltage Elements Settings and Settings Ranges (Delta-Connected Pts)

115

Figure 3.21 Single-Phase and Three-Phase Voltage Elements (Wye-Connected Pts)

116

Figure 3.22 Phase-To-Phase and Sequence Voltage Elements (Wye-Connected Pts)

117

Figure 3.23 Phase-To-Phase Voltage Elements (Delta-Connected Pts)

118

Figure 3.24 Sequence Voltage Elements (Delta-Connected Pts)

118

Figure 3.25 Channel VS Voltage Elements (Wye- or Delta-Connected Pts)

119

Undervoltage Element Operation Example

119

Overvoltage Element Operation Example

119

Voltage Elements Used in POTT Logic

120

Synchronism Check Elements

121

Table 3.11 Synchronism Check Elements Settings and Settings Ranges

121

Setting SYNCP

122

Wye-Connected Voltages

122

Delta-Connected Voltages

122

Figure 3.26 Synchronism Check Voltage Window and Slip Frequency Elements

123

Figure 3.27 Synchronism Check Elements

123

System Frequencies Determined from Voltages

125

System Rotation Can Affect Setting SYNCP

126

Other Uses for Voltage Window Elements

126

Block Synchronism Check Conditions

126

Slip Frequency Calculator

127

Generator Application for SSLOW and SFAST

127

Angle Difference Calculator

128

Angle Difference Example

129

Figure 3.28 Angle Difference between V

130

Synchronism Check Element Outputs

131

Synchronism Check Applications for Automatic Reclosing and Manual Closing

132

Frequency Elements

134

Frequency Element Settings

134

Figure 3.31 Levels 1-6 Frequency Elements

135

Table 3.12 Frequency Elements Settings and Settings Ranges

136

Create Over- and Underfrequency Elements

136

Overfrequency Element

136

Overfrequency Element Operation

137

Underfrequency Element Operation

137

Frequency Element Voltage Control

137

Other Uses for Undervoltage Element 27B81

138

Frequency Element Uses

138

Underfrequency Loadshedding

138

Voltage Sag, Swell, and Interruption Elements (Available in Firmware Version 7)

139

Figure 3.32 Voltage Sag Elements

139

Figure 3.33 Voltage Swell Elements

140

Figure 3.34 Voltage Interruption Elements

140

Voltage Sag, Swell, and Interruption Elements Settings

140

Table 3.13 Sag/Swell/Interruption Elements Settings (Must First Set ESSI = Y)

141

Vbase Thermal Element Block

141

Figure 3.35 Vbase Tracking Example (Three-Phase Disturbance, Wye Connected)

142

Vbase Initialization

142

Vbase Tracking Range

143

SSI Reset Command

143

Power Elements (Available in Firmware Version 7)

144

Power Elements Settings

144

Table 3.14 Single-Phase Power Element Settings and Setting Ranges (EPWR = 1, 2, 3, or 4)

144

Table 3.15 Three-Phase Power Element Settings and Setting Ranges (EPWR = 3P1, 3P2, 3P3, or 3P4)

144

Power Element Time Delay Setting Considerations

145

Using Power Elements in the Relay Trip Equation

145

Single-Phase Power Element Calculations

147

Three-Phase Power Element Calculations

147

Power Elements Logic Operation

147

Figure 3.36 Single-Phase Power Elements Logic (+VARS Example Shown)

147

Figure 3.37 Three-Phase Power Elements Logic

148

Figure 3.38 Power Elements Operation in the Real/Reactive Power Plane

148

Figure 3.39 SEL-351S(B) Provides VAR Control for 9600 Kvar Capacitor Bank

149

Figure 3.40 Per Unit Setting Limits for Switching 9600 Kvar Capacitor Bank On- and Off-Line

151

Settings for Single-Phase Power Elements

151

Settings for Three-Phase Power Elements

152

Section 4: Loss-Of-Potential, Load Encroachment, and Directional Element Logic

154

Loss-Of-Potential Logic

154

Table 4.1 LOP Logic Inputs

154

Figure 4.1 Loss-Of-Potential Logic

154

Setting VNOM = off

155

Setting ELOP

155

Setting ELOP = y

156

Setting ELOP = N

156

Load-Encroachment Logic

157

Figure 4.2 Load-Encroachment Logic

157

Table 4.2 Load-Encroachment Settings Ranges

158

Load-Encroachment Setting Example

158

Convert Maximum Loads to Equivalent Secondary Impedances

158

Convert Power Factors to Equivalent Load Angles

159

Figure 4.3 Migration of Apparent Positive-Sequence Impedance for a Fault Condition

160

Directional Control for Neutral Ground and Residual Ground Overcurrent Elements

162

Figure 4.4 General Logic Flow of Directional Control for Neutral Ground and Residual Ground Overcurrent Elements (Excluding Ungrounded/High-Impedance Grounded Systems)

163

Table 4.3 Available Ground Directional Elements

164

Table 4.4 Best Choice Ground Directional™ Logic

164

Figure 4.5 General Logic Flow of Directional Control for Neutral Ground and Residual Ground Overcurrent Elements (Ungrounded/High-Impedance Grounded Systems; ORDER = U)

164

Table 4.5 Ground Directional Element Availability by Voltage Connection Settings

166

Internal Enables

167

Zero-Sequence Voltage Sources

168

Directional Elements

169

Directional Element Routing

170

Loss-Of-Potential

170

Figure 4.6 Internal Enables (32QE and 32QGE) Logic for Negative-Sequence Voltage-Polarized Directional Elements

172

Figure 4.7 Internal Enables (32VE and 32IE) Logic for Zero-Sequence Voltage-Polarized and Channel in Current-Polarized Directional Elements

173

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)

174

Figure 4.9 Negative-Sequence Voltage-Polarized Directional Element for Neutral Ground and Residual Ground Overcurrent Elements

175

Figure 4.10 Zero-Sequence Voltage-Polarized Directional Element

176

Figure 4.11 Channel in Current-Polarized Directional Element

177

Figure 4.12 Zero-Sequence Voltage-Polarized Directional Element (Low-Impedance Grounded Systems)

178

Figure 4.13 Wattmetric and Incremental Conductance Directional Elements (Petersen Coil Grounded Systems)

179

Figure 4.14 Zero-Sequence Voltage-Polarized Directional Element (Ungrounded/High-Impedance Grounded Systems)

180

Figure 4.15 Routing of Directional Elements to Residual Ground Overcurrent Elements

181

Figure 4.16 Routing of Direction Elements to Neutral Ground Overcurrent Elements

181

Figure 4.17 Direction Forward/Reverse Logic for Residual Ground Overcurrent Elements

182

Figure 4.18 Direction Forward/Reverse Logic for Neutral Ground Overcurrent Elements

183

Directional Control for Negative-Sequence and Phase Overcurrent Elements

184

Figure 4.19 General Logic Flow of Directional Control for Negative-Sequence and Phase Overcurrent Elements

184

Direction Forward/Reverse Logic

186

Figure 4.20 Negative-Sequence Voltage-Polarized Directional Element for Negative-Sequence and Phase Overcurrent Elements

187

Figure 4.21 Positive-Sequence Voltage-Polarized Directional Element for Phase Overcurrent Elements

188

Figure 4.22 Routing of Directional Elements to Negative-Sequence and Phase Overcurrent Elements

189

Figure 4.23 Direction Forward/Reverse Logic for Negative-Sequence Overcurrent Elements

190

Figure 4.24 Direction Forward/Reverse Logic for Phase Overcurrent Elements

191

Directional Control Settings

192

Table 4.6 Directional Control Settings Not Made for Particular Conditions

193

Table 4.7 Overcurrent Elements Controlled by Level Direction Settings DIR1-DIR4

193

ORDER-Ground Directional Element Priority Setting

194

Petersen Coil Considerations for Setting ORDER

195

Table 4.8 Z Constant for Z2R Setting

196

K2 Set Automatically

198

Z0F and Z0R Set Automatically

201

Table 4.9 Z Constant for Z0R Setting

201

Deriving Z0F and Z0R Settings

201

Figure 4.25 Zero-Sequence Impedance Network and Relay Polarity

202

Figure 4.26 Zero-Sequence Impedance Plot for Solidly-Grounded, Mostly Inductive System

202

Figure 4.27 Zero-Sequence Impedance Network for Ground Fault on Feeder 1

205

Figure 4.28 Wattmetric Element Operation for Ground Fault on Feeder 1

206

32WD-Wattmetric Delay (Petersen Coil Grounded System)

207

Settings Considerations for Petersen Coil Grounded Systems

207

Table 4.10 Affect of Global Settings VSCONN and PTCONN on Petersen Coil Directional

209

E32IV-SEL OGIC Control Equation Enable

209

Ungrounded/High-Impedance Grounded System Considerations for Setting E32IV

210

Directional Control Provided by Torque Control Settings

211

Trip and Target Logic

212

Figure 5.1 Trip Logic

213

Figure 5.2 Minimum Trip Duration Timer Operation (See Bottom of Figure 5.1)

214

Unlatch Trip

214

Section 5: Trip and Target Logic Trip Logic

215

Other Applications for the Target Reset Function

215

Factory Settings Example (Using Setting TR)

215

Unlatch Trip with 52A Circuit Breaker Auxiliary Contact

216

Unlatch Trip with 52B Circuit Breaker Auxiliary Contact

216

Switch-Onto-Fault (SOTF) Trip Logic

219

Figure 5.3 Three-Pole Open Logic (Top) and Switch-Onto-Fault Logic (Bottom)

219

Circuit Breaker Operated Switch-Onto-Fault Logic

220

Switch-Onto-Fault Logic Output (SOTFE)

221

Switch-Onto-Fault Trip Logic Trip Setting (TRSOTF)

221

Communications-Assisted Trip Logic-General Overview

222

Figure 5.4 Communications-Assisted Tripping Scheme

222

Trip Setting TRCOMM

223

Trip Setting DTT

224

Permissive Overreaching Transfer Trip (POTT) Logic

226

External Inputs

226

PT1-Received Permissive Trip Signal(S)

226

Figure 5.5 Permissive Input Logic Routing to POTT Logic

227

Timer Settings

227

Logic Outputs

227

EKEY-Echo Key Permissive Trip

228

Figure 5.6 POTT Logic

229

Figure 5.7 Permissive Input Logic Routing to Trip Logic

230

Variations for Permissive Underreaching Transfer Trip (PUTT) Scheme

230

Installation Variations

230

Figure 5.8 SEL-351S Connections to Communications Equipment for a Two-Terminal Line POTT Scheme

231

Figure 5.9 SEL-351S Connections to Communications Equipment for a Three-Terminal Line POTT Scheme

231

Directional Comparison Unblocking (DCUB) Logic

232

Figure 5.10 DCUB Logic

235

Figure 5.11 Unblocking Block Logic Routing to Trip Logic

236

PTRX1, PTRX2-Permissive Trip Receive Outputs

236

Figure 5.12 SEL-351S Connections to Communications Equipment for a Two-Terminal Line DCUB Scheme (Setting ECOMM = DCUB1)

236

Figure 5.13 SEL-351S Connections to Communications Equipment for a Three-Terminal Line DCUB Scheme (Setting ECOMM = DCUB2)

237

Directional Comparison Blocking (DCB) Logic

238

DSTRT-Directional Carrier Start

239

NSTRT-Nondirectional Carrier Start

239

BTX-Block Trip Extension

240

Figure 5.14 DCB Logic

240

Figure 5.15 SEL-351S Connections to Communications Equipment for a Two-Terminal Line DCB Scheme

241

Figure 5.16 SEL-351S Connections to Communications Equipment for a Three-Terminal Line DCB Scheme

242

Front-Panel Target Leds

243

Table 5.1 SEL-351S Front-Panel Target LED Definitions and Settings

243

Figure 5.17 Programmable Front-Panel Target LED Logic

244

Front-Panel Target LED Logic Details

244

Target Reset/Lamp Test Front-Panel Pushbutton

247

Figure 5.18 Seal-In of Breaker Failure Occurrence for Message Display

247

Close and Reclose Logic

250

Section 6: Close and Reclose Logic Close Logic

251

Figure 6.1 Close Logic

251

Set Close

251

Unlatch Close

252

Factory Settings Example

252

Figure 6.2 Close Conditions-Other than Auto-Reclosing

253

Figure 6.3 Unlatch Close Conditions

254

Circuit Breaker Status

254

Figure 6.4 Breaker Status Determination

255

Program an Output Contact for Closing

255

Reclose Supervision Logic

256

Figure 6.5 Reclose Supervision Logic (Following Open-Interval Time-Out)

256

Figure 6.6 Reclose Supervision Limit Timer Operation (Refer to Bottom of Figure 6.5)

257

Settings and General Operation

257

For most Applications

257

For a Few, Unique Applications

258

Additional Settings

260

Figure 6.7 SEL-351S Relays Installed at both Ends of a Transmission Line in a High-Speed Reclose Scheme

260

Additional Settings Example

261

Reclosing Relay

263

Table 6.1 Relay Word Bit and Front-Panel Correspondence to Reclosing Relay States

264

Figure 6.8 Reclosing Relay States and General Operation

264

Reclosing Relay States and Settings/Setting Group Changes

265

Lockout State

265

Defeat the Reclosing Relay

266

Close Logic Can Still Operate When the Reclosing Relay Is Defeated

266

Table 6.2 Reclosing Relay Timer Settings and Setting Ranges

266

Open-Interval Timers

267

Figure 6.9 Example Reclosing Sequence from Reset to Lockout

267

Determination of Number of Reclosures (Last Shot)

267

Observe Shot Counter Operation

268

Reset Timer

268

Monitoring Open-Interval and Reset Timing

269

Reclosing Relay Shot Counter

269

Table 6.3 Shot Counter Correspondence to Relay Word Bits and Open-Interval Times

269

Reclose Initiate and Reclose Initiate Supervision Settings

270

Other Settings Considerations

271

Drive-To-Lockout and Drive-To-Last Shot Settings (79DTL and 79DLS, Respectively)

272

Figure 6.10 Factory-Default Drive-To-Lockout Logic

273

Table 6.5 Example Open-Interval Time Settings

274

Figure 6.11 Reclose Blocking for Islanded Generator

275

Additional Settings Example

275

Sequence Coordination Setting (79SEQ)

277

Figure 6.13 Operation of SEL-351S Shot Counter for Sequence Coordination with Line Recloser

278

Reclose Supervision Setting (79CLS)

280

Inputs, Outputs, Timers, and Other Control Logic

282

Optoisolated Inputs

283

Figure 7.1 Example Operation of Optoisolated Inputs IN101-IN106

283

Figure 7.2 Example Operation of Optoisolated Inputs IN201-IN208-Extra I/O Board

284

Input Debounce Timers

284

Input Functions

285

Settings Examples

285

Figure 7.3 Circuit Breaker Auxiliary Contact and Reclose Enable Switch Connected to Optoisolated Inputs IN101 and IN102

285

Local Control Switches

287

Figure 7.4 Local Control Switches Drive Local Bits LB1-LB16

287

Table 7.1 Correspondence between Local Control Switch Positions and Label Settings

287

On/Off Switch

287

Table 7.2 Correspondence between Local Control Switch Types and Required Label Settings

288

Figure 7.5 Local Control Switch Configured as an ON/OFF Switch

288

Figure 7.6 Local Control Switch Configured as an OFF/MOMENTARY Switch

288

Figure 7.7 Local Control Switch Configured as an ON/OFF/MOMENTARY Switch

288

Figure 7.8 Configured Manual Trip Switch Drives Local Bit LB3

289

Figure 7.9 Configured Manual Close Switch Drives Local Bit LB4

289

Remote Control Switches

291

Figure 7.10 Remote Control Switches Drive Remote Bits RB1-RB16

291

Latch Control Switches

293

Figure 7.11 Traditional Latching Relay

293

Figure 7.12 Latch Control Switches Drive Latch Bits LT1-LT16

293

Latch Control Switch Application Ideas

294

Reclosing Relay Enable/Disable Setting Example

294

Figure 7.13 SCADA Contact Pulses Input IN104 to Enable/Disable Reclosing Relay

294

Figure 7.14 Latch Control Switch Controlled by a Single Input to Enable/Disable Reclosing

294

Feedback Control

295

Rising Edge Operators

295

Figure 7.15 Latch Control Switch Operation Time Line

296

Use a Remote Bit Instead to Enable/Disable the Reclosing Relay

296

Latch Control Switch States Retained

296

Figure 7.16 Time Line for Reset of Latch Bit LT2 after Active Setting Group Change

297

Note: Make Latch Control Switch Settings with Care

297

Figure 7.17 Latch Control Switch (with Time Delay Feedback) Controlled by a Single Input to Enable/Disable Reclosing

298

Figure 7.18 Latch Control Switch (with Time Delay Feedback) Operation Time Line

299

Multiple Setting Groups

300

Table 7.3 Definitions for Active Setting Group Indication Relay Word Bits SG1-SG6

300

Selecting the Active Setting Group

300

Push Button

301

Relay Disabled Momentarily During Active Setting Group Change

301

Table 7.5 SEL OGIC Control Equation Settings for Switching Active Setting Group between Setting Groups 1 and

302

Figure 7.19 SCADA Contact Pulses Input IN105 to Switch Active Setting Group between Setting Groups 1 and

302

Table 7.6 Active Setting Group Switching Input Logic

304

Figure 7.21 Active Setting Group Switching (with Single Input) Time Line

304

Figure 7.22 Rotating Selector Switch Connected to Inputs IN101, IN102, and IN103 for Active Setting Group Switching

305

Selector Switch Now Rests on Position REMOTE

306

Figure 7.23 Active Setting Group Switching (with Rotating Selector Switch) Time Line

307

Active Setting Group Retained

307

Settings Change

307

Note: Make Active Setting Group Switching Settings with Care

308

SEL OGIC Control Equation Variables/Timers

309

Settings Example

310

Output Contacts

313

Operation of Output Contacts for Different Output Contact Types

313

ALARM Output Contact

314

Figure 7.27 Logic Flow for Example Output Contact Operation

315

Figure 7.28 Logic Flow for Example Output Contact Operation-Extra I/O Board

316

Rotating Default Display

317

Figure 7.29 Traditional Panel Light Installations

317

Reclosing Relay Status Indication

317

Circuit Breaker Status Indication

317

Figure 7.30 Rotating Default Display Replaces Traditional Panel Light Installations

318

General Operation of Rotating Default Display Settings

318

Reclosing Relay Enabled

318

Additional Settings Examples

320

Continually Display a Message

320

Active Setting Group Switching Considerations

321

Setting Group 1 Is the Active Setting Group

321

Displaying Values (Other than Userentered Text) on the Rotating Default Display

322

Values Displayed for Incorrect Settings

323

Table 7.8 Mnemonic Settings for Metering on the Rotating Default Display

324

Extra Details for Displaying Breaker Wear Monitor Quantities on the Rotating Default Display

327

Section 8: Breaker Monitor, Metering, and Load Profile Functions

327

Table 7.9 Mnemonic Settings for Breaker Wear Monitor Values on the Rotating Default Display

328

Extra Details for Displaying Time-Overcurrent Elements on the Rotating Default Display

328

Displaying Time-Overcurrent Elements Example

329

Table 7.10 Mnemonic Settings for Time-Overcurrent (TOC) Element Pickups on the Rotating Default

330

Additional Format for Displaying Time-Overcurrent Elements on the Rotating Default Display

330

Table 7.11 Mnemonic Settings for Time-Overcurrent (TOC) Element Pickups Using the Same-Line-Label Format on the Rotating Default Display

330

Control Strings

332

Breaker Monitor, Metering, and Load Profile Functions

334

Introduction

334

Breaker Monitor

335

Table 8.1 Breaker Maintenance Information for a 25 Kv Circuit Breaker

335

Breaker Monitor Setting Example

336

Figure 8.1 Plotted Breaker Maintenance Points for a 25 Kv Circuit Breaker

336

Table 8.2 Breaker Monitor Settings and Settings Ranges

336

Breaker Maintenance Curve Details

337

Figure 8.2 SEL-351S Breaker Maintenance Curve for a 25 Kv Circuit Breaker

338

Figure 8.3 Operation of SEL OGIC Control Equation Breaker Monitor Initiation Setting

339

Breaker Monitor Operation Example

339

Percent to 25 Percent Breaker Wear

340

Percent to 50 Percent Breaker Wear

340

Percent to 100 Percent Breaker Wear

340

Figure 8.4 Breaker Monitor Accumulates 10 Percent Wear

341

Figure 8.5 Breaker Monitor Accumulates 25 Percent Wear

342

Figure 8.6 Breaker Monitor Accumulates 50 Percent Wear

343

Figure 8.7 Breaker Monitor Accumulates 100 Percent Wear

344

Breaker Monitor Output

344

Via Serial Port

345

Determination of Relay Initiated Trips and Externally Initiated Trips

345

Factory Default Setting Example

346

Additional Example

346

Figure 8.8 Input IN106 Connected to Trip Bus for Breaker Monitor Initiation

346

Station DC Battery Monitor

348

Figure 8.9 DC Under- and Overvoltage Elements

348

Create Desired Logic for DC Under- and Overvoltage Alarming

348

View Station DC Battery Voltage

350

Station DC Battery Voltage Dips During Circuit Breaker Tripping

351

Station DC Battery Voltage Dips During Circuit Breaker Closing

351

Station DC Battery Voltage Dips Anytime

351

Powering the Relay

352

Demand Metering

353

Comparison of Thermal and Rolling Demand Meters

353

Figure 8.11 Response of Thermal and Rolling Demand Meters to a Step Input (Setting DMTC = 15 Minutes)

354

Thermal Demand Meter Response (EDEM = THM)

355

Figure 8.12 Voltage

355

Rolling Demand Meter Response (EDEM = ROL)

355

Time = 0 Minutes

356

Time = 5 Minutes

356

Time = 10 Minutes

356

Time = 15 Minutes

357

Table 8.3 Demand Meter Settings and Settings Range

357

Demand Current Logic Output Application-Raise Pickup for Unbalance Current

358

Figure 8.14 Raise Pickup of Residual Ground Time-Overcurrent Element for Unbalance Current

359

Residual Ground Demand Current below Pickup GDEMP

359

Residual Ground Demand Current Goes above Pickup GDEMP

359

Demand Metering Updating and Storage

361

Energy Metering

362

Energy Metering Updating and Storage

362

Maximum/Minimum Metering

363

Table 8.4 Operation of Maximum/Minimum Metering with Directional Power Quantities

363

Maximum/Minimum Metering Update and Storage

364

Small Signal Cutoff for Metering

365

Table 8.5 Metering Thresholds (Secondary Units)

365

Synchrophasor Metering

366

View Synchrophasor Metering Information Via Serial Port

366

Load Profile Report (Available in Firmware Versions 6 and 7)

367

Determining the Size of the Load Profile Buffer

370

Clearing the Load Profile Buffer

370

Setting the Relay

372

Table 9.1 Serial Port SET Commands

372

In some Applications, Make Global Settings (SET G) First

372

Section 9: Setting the Relay Introduction

373

Settings Changes Via the Front Panel

374

Settings Changes Via the Serial Port

375

Table 9.2 Set Command Editing Keystrokes

375

Time-Overcurrent Curves

376

Table 9.3 Equations Associated with U.S. Curves

376

Table 9.4 Equations Associated with IEC Curves

376

Recloser Curves

377

Table 9.5 Recloser Curve Designations

377

Figure 9.1 U.S. Moderately Inverse Curve: U1

378

Figure 9.2 U.S. Inverse Curve: U2

379

Figure 9.3 U.S. very Inverse Curve: U3

380

Figure 9.4 U.S. Extremely Inverse Curve: U4

381

Figure 9.5 U.S. Short-Time Inverse Curve: U5

382

Figure 9.6 I.E.C. Class a Curve (Standard Inverse): C1

383

Figure 9.7 I.E.C. Class B Curve (very Inverse): C2

384

Figure 9.8 I.E.C. Class C Curve (Extremely Inverse): C3

385

Figure 9.9 I.E.C. Long-Time Inverse Curve: C4

386

Figure 9.10 I.E.C. Short-Time Inverse Curve: C5

387

Figure 9.11 Recloser Control Response Curves A, C, N, and W

388

Figure 9.12 Recloser Control Response Curves B, R, 2, and 3

389

Figure 9.13 Recloser Control Response Curves D, 8PLUS, and 16

390

Figure 9.14 Recloser Control Response Curves F, H, J, and 1

391

Figure 9.15 Recloser Control Response Curves G, V, 6, and 13

392

Figure 9.16 Recloser Control Response Curves E, P, and 18

393

Figure 9.17 Recloser Control Response Curves KG, Y, Z, and 5

394

Figure 9.18 Recloser Control Response Curves KP, M, T, and 17

395

Figure 9.19 Recloser Control Response Curves 4, 9, 11, and 14

396

Figure 9.20 Recloser Control Response Curves L, 7, 8, and 15

397

Relay Word Bits (Used in SEL OGIC Control Equations)

398

Table 9.6 SEL-351S Relay Word Bits

398

Table 9.7 Relay Word Bit Definitions for SEL-351S

400

Settings Explanations

419

Identifier Labels

419

Current Transformer Ratios

419

Settings for Voltage Input Configuration

421

Table 9.8 Main Relay Functions that Change with VSCONN, When PTCONN = WYE

422

Table 9.9 Main Relay Functions that Change with VSCONN, When PTCONN = DELTA

423

Figure 9.21 Operation of DELTA and 3V0 Relay Word Bits

423

Table 9.10 Main Relay Functions that Change with VNOM = off

424

Potential Transformer Ratios and PT Nominal Secondary Voltage Settings

424

Line Settings

425

Figure 9.22 Hybrid Power System with Neutral Ground Resistor

425

Other System Parameters

426

Settings Sheets

428

SEL-351S Settings Sheets

430

Relay Settings

430

Instantaneous/Definite-Time Overcurrent Enable Settings

431

Time-Overcurrent Enable Settings

431

Other Enable Settings

431

Phase-To-Phase Instantaneous Overcurrent Elements

433

Phase Time-Overcurrent Element

435

Frequency Element

441

Other Settings

443

Power Elements

444

Communications-Assisted Trip Scheme Input Equations

447

Torque Control Equations for Inst./Def.-Time Overcurrent Elements

449

Torque Control Equations for Time-Overcurrent Elements

449

SEL SEL-351S Protection System Manuals

Sel SEL-351S Instruction Manual (760 pages)

Table of Contents

SEL SEL-351S Instruction Manual (758 pages)

Table of Contents

Table of Contents

List of Tables

List of Figures

Table of Contents

Preface

Section 1: Introduction and Specifications

Section 2: Installation

Section 3: Overcurrent, Voltage, Synchronism Check, Frequency, and Power Elements

Section 4: Loss-Of-Potential, Load Encroachment, and Directional Element Logic

Section 5: Trip and Target Logic Trip Logic

Section 6: Close and Reclose Logic Close Logic

Section 8: Breaker Monitor, Metering, and Load Profile Functions

Section 9: Setting the Relay Introduction

Section 10: Serial Port Communications and Commands

SEL-351S Relay Command Summary

Section 11: Front-Panel Interface

Section 13: Testing and Troubleshooting

Appendix A: Firmware and Manual Versions Firmware

Appendix B: SEL-300 Series Relays Firmware Upgrade Instructions

Appendix C: SEL Distributed Port Switch Protocol

Appendix D: Configuration, Fast Meter, and Fast Operate Commands

Appendix E: Compressed ASCII Commands

Appendix F: Setting Negative-Sequence Overcurrent Elements

Appendix G: Setting SEL OGIC Control Equations

Appendix H: Distributed Network Protocol

Appendix I: MIRRORED BITS Communications (in Firmware Versions 6 and 7) Overview

Appendix J: SEL-351S Fast SER Protocol

Ac Sel Erator

Appendix K: Acseleratorquickset SEL-5030 Software

Appendix Lsel Synchrophasors

SEL-351S Relay Command Summary

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