Basler-electric DECS-250N User Manual Page 60
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44 9440500990 Rev D
Protection DECS-250N
Generator Overvoltage
An overvoltage pickup condition occurs when the sensed generator terminal voltage increases above the
pickup setting
A
. An overvoltage trip condition occurs if the generator voltage remains above the pickup
threshold for the duration of the time delay setting
B
. Generator overvoltage protection can be enabled and
disabled
C
without altering the pickup and time delay settings. Overvoltage pickup and trip elements in
BESTlogicPlus can be used in a logic scheme to initiate corrective action in response to the condition.
BESTCOMSPlus generator overvoltage settings are illustrated in Figure 29.
Figure 29. Generator Overvoltage Protection Settings
A
Generator Overvoltage Pickup (V): Adjustable from 0 to 600,000 Vac in 1 Vac increments.
B
Generator Overvoltage Time Delay (s): Adjustable from 0.1 to 60 seconds in 0.1 second increments.
C
Generator Overvoltage Enable/Disable: Select Enabled or Disabled.
Loss of Sensing
The generator voltage is monitored for a loss of sensing (LOS) condition. LOS protection settings are
illustrated in Figure 30.
In the DECS-250N, a loss of sensing event is calculated using sequence components. A loss of sensing
event occurs when the positive sequence voltage drops below the balanced
A
setting percentage of the
AVR setpoint, or when the negative sequence voltage increases above the unbalanced
B
setting
percentage of the positive sequence voltage. A delay timer
C
is started when the event occurs, delaying
the alarm by a predetermined time
A LOS condition can be used to initiate a transfer to manual (FCR) control mode
D
. It also can be
configured in BESTlogicPlus to initiate other actions. Protection can be enabled and disabled
E
without
altering the individual loss of sensing settings.
LOS protection is automatically disabled when a short circuit exists. A short circuit is detected when the
measured current is greater than twice the rated current for a single-phase CT connection and when the
positive sequence current is greater than twice the rated current for a three-phase CT connection.
Figure 30. Loss of Sensing Protection Settings
- INSTRUCTION MANUAL 1
- Preface 3
- Warning! 4
- 9440500990 Rev D iii 5
- DECS-250N Preface 5
- Contents 7
- Introduction 17
- Applications 18
- Package 18
- Storage 19
- 4 9440500990 Rev C 20
- Introduction DECS-250N 20
- Controls and Indicators 21
- Menu Navigation 22
- Adjusting Settings 23
- Display Setup 23
- 8 9440500990 Rev D 24
- Screen Scrolling 24
- Power Inputs 25
- 10 9440500990 Rev D 26
- Power Inputs DECS-250N 26
- Power Stage 27
- 12 9440500990 Rev D 28
- Power Stage DECS-250N 28
- Voltage and Current Sensing 29
- 14 9440500990 Rev D 30
- Cross-Current Compensation 30
- Bus Voltage 31
- 16 9440500990 Rev D 32
- Synchronizer 33
- 18 9440500990 Rev D 34
- Synchronizer DECS-250N 34
- Angle Compensation 34
- Failure of Synchronization 34
- 22 9440500990 Rev D 38
- Generator Governor Control 39
- 24 9440500990 Rev D 40
- 26 9440500990 Rev D 42
- Regulation DECS-250N 42
- Pre-Position Setpoints 43
- Transient Boost 44
- 9440500990 Rev D 29 45
- DECS-250N Regulation 45
- Reactive Droop Compensation 45
- Network Load Sharing 45
- 30 9440500990 Rev D 46
- Line Drop Compensation 46
- Autotracking 47
- Setpoint Configure 48
- Auxiliary Control 49
- Summing Type 50
- 9440500990 Rev D 35 51
- DECS-250N Auxiliary Control 51
- 36 9440500990 Rev D 52
- Auxiliary Control DECS-250N 52
- Contact Inputs and Outputs 53
- 9440500990 Rev D 39 55
- 40 9440500990 Rev D 56
- Protection 57
- 42 9440500990 Rev D 58
- Protection DECS-250N 58
- 9440500990 Rev D 43 59
- DECS-250N Protection 59
- Generator Undervoltage 59
- 44 9440500990 Rev D 60
- Generator Overvoltage 60
- Loss of Sensing 60
- Frequency Protection 61
- Power Protection 62
- 9440500990 Rev D 47 63
- Field Protection 64
- 9440500990 Rev D 49 65
- 50 9440500990 Rev D 66
- Exciter Diode Monitor 66
- 9440500990 Rev D 51 67
- 52 9440500990 Rev D 68
- Power Input Failure 68
- Sync-Check Protection 69
- Configurable Protection 70
- 9440500990 Rev D 55 71
- 56 9440500990 Rev D 72
- 58 9440500990 Rev D 74
- Limiters DECS-250N 74
- Takeover OEL 74
- 9440500990 Rev D 59 75
- DECS-250N Limiters 75
- 60 9440500990 Rev D 76
- Underexcitation Limiter 77
- 62 9440500990 Rev D 78
- Stator Current Limiter 79
- 64 9440500990 Rev D 80
- Low-Level Limiting 80
- High-Level Limiting 80
- Initial Delay 80
- Var Limiter 81
- Limiter Scaling 81
- Underfrequency Limiter 82
- GENERATOR VOLTS 83
- 68 9440500990 Rev D 84
- Metered Parameters 86
- 9440500990 Rev D 71 87
- DECS-250N Metering 87
- 72 9440500990 Rev D 88
- Metering DECS-250N 88
- 9440500990 Rev D 73 89
- Synchronization 89
- Auxiliary Control Input 89
- Tracking 89
- 74 9440500990 Rev D 90
- Control Panel 90
- 9440500990 Rev D 75 91
- Metering Summary 91
- Status Indication 92
- 9440500990 Rev D 77 93
- 78 9440500990 Rev D 94
- Outputs 94
- 9440500990 Rev D 79 95
- Network Load Share 95
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- 9440500990 Rev D 81 97
- 82 9440500990 Rev D 98
- 9440500990 Rev D 83 99
- Real-Time Clock 99
- Auto Export Metering 100
- Event Recorder 101
- 86 9440500990 Rev D 102
- Event Recorder DECS-250N 102
- Triggers 102
- 9440500990 Rev D 87 103
- DECS-250N Event Recorder 103
- 88 9440500990 Rev D 104
- Trending 105
- 90 9440500990 Rev D 106
- Power System Stabilizer 107
- 92 9440500990 Rev D 108
- PSS Frequency Input Signal 109
- PSS Power Input Signal 110
- P0026-21 111
- 12-09-04 111
- 96 9440500990 Rev D 112
- Output Stage 112
- Terminal Voltage Limiter 112
- 9440500990 Rev D 97 113
- 98 9440500990 Rev D 114
- 9440500990 Rev D 99 115
- 100 9440500990 Rev D 116
- Stability Tuning 117
- Caution 118
- 9440500990 Rev D 103 119
- DECS-250N Stability Tuning 119
- Auto Tuning 119
- FCR and FVR Modes 120
- 9440500990 Rev D 105 121
- FVR Mode Stability Settings 121
- Other Modes and Functions 122
- 9440500990 Rev D 107 123
- 108 9440500990 Rev D 124
- Stability Tuning DECS-250N 124
- Mounting 125
- 110 9440500990 Rev D 126
- Mounting DECS-250N 126
- 9440500990 Rev D 111 127
- DECS-250N Mounting 127
- 112 9440500990 Rev D 128
- 9440500990 Rev D 113 129
- 114 9440500990 Rev D 130
- Terminals and Connectors 131
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- 9440500990 Rev D 117 133
- 118 9440500990 Rev D 134
- Terminal Types 135
- 120 9440500990 Rev D 136
- Typical Connections 137
- 122 9440500990 Rev D 138
- 9440500990 Rev D 123 139
- 124 9440500990 Rev D 140
- BESTCOMSPlus 141
- Software 141
- Installation 142
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- Software DECS-250N 144
- 9440500990 Rev D 129 145
- DECS-250N BESTCOMSPlus 145
- Menu Bars 146
- 9440500990 Rev D 131 147
- Settings Explorer 148
- Metering Explorer 148
- Settings File Management 149
- 134 9440500990 Rev D 150
- Automatic Metering Export 151
- Firmware Updates 151
- 9440500990 Rev D 137 153
- Updates 154
- BESTlogic™Plus 155
- 140 9440500990 Rev D 156
- BESTlogic™Plus DECS-250N 156
- BESTlogic™Plus Composition 156
- 9440500990 Rev D 141 157
- DECS-250N BESTlogic™Plus 157
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- 9440500990 Rev D 153 169
- Logic Schemes 170
- 156 9440500990 Rev D 172
- 9440500990 Rev D 157 173
- Programming BESTlogic™Plus 174
- 9440500990 Rev D 159 175
- Pickup and Dropout Timers 175
- Offline Logic Simulator 176
- BESTlogic™Plus Examples 178
- Communication 179
- Modbus™ Communication 180
- 9440500990 Rev D 165 181
- DECS-250N Communication 181
- Ethernet Port 181
- CAN Communication 182
- Ethernet Communication 183
- 168 9440500990 Rev D 184
- Communication DECS-250N 184
- 9440500990 Rev D 169 185
- PROFIBUS Communication 186
- Configuration 187
- 172 9440500990 Rev D 188
- Configuration DECS-250N 188
- Generator PT 188
- Generator CTs 188
- 9440500990 Rev D 173 189
- DECS-250N Configuration 189
- Operating Power Input 189
- Modes of Operation 189
- Startup Functions 190
- Device Information 191
- Display Units 192
- 9440500990 Rev D 177 193
- 178 9440500990 Rev D 194
- Security 195
- Port Security 196
- Login and Access Controls 197
- 182 9440500990 Rev D 198
- Security DECS-250N 198
- Login Failure 198
- Timekeeping 199
- 184 9440500990 Rev D 200
- Timekeeping DECS-250N 200
- 9440500990 Rev D 185 201
- DECS-250N Timekeeping 201
- 186 9440500990 Rev D 202
- Testing 203
- Frequency Response 204
- 9440500990 Rev D 189 205
- DECS-250N Testing 205
- Bode Plotting 205
- Transfer Function 205
- Time Response 206
- 9440500990 Rev D 191 207
- Signal Input 207
- Test Signal Characteristics 207
- Step Response Analysis 208
- Analysis Options 209
- 194 9440500990 Rev D 210
- Testing DECS-250N 210
- CAN Parameters 211
- 196 9440500990 Rev D 212
- CAN Communication DECS-250N 212
- 9440500990 Rev D 197 213
- DECS-250N CAN Communication 213
- 198 9440500990 Rev D 214
- Modbus Modes of Operation 216
- 9440500990 Rev D 201 217
- Modbus on TCP/IP 217
- 202 9440500990 Rev D 218
- 9440500990 Rev D 203 219
- Read Holding Registers 219
- Return Query Data 219
- 204 9440500990 Rev D 220
- Listen Only Mode 220
- Preset Multiple Registers 220
- 9440500990 Rev D 205 221
- Preset Single Register 221
- Data Formats 222
- Modbus Parameters 224
- 9440500990 Rev D 209 225
- Binary Points 225
- 210 9440500990 Rev D 226
- 9440500990 Rev D 211 227
- 212 9440500990 Rev D 228
- 9440500990 Rev D 213 229
- 214 9440500990 Rev D 230
- 9440500990 Rev D 215 231
- 216 9440500990 Rev D 232
- 9440500990 Rev D 217 233
- 218 9440500990 Rev D 234
- Metering 234
- 9440500990 Rev D 219 235
- 220 9440500990 Rev D 236
- 9440500990 Rev D 221 237
- 222 9440500990 Rev D 238
- 9440500990 Rev D 223 239
- Limiters 239
- 224 9440500990 Rev D 240
- 9440500990 Rev D 225 241
- Setpoints 241
- 226 9440500990 Rev D 242
- 9440500990 Rev D 227 243
- Global Settings 243
- 228 9440500990 Rev D 244
- Relay Settings 244
- 9440500990 Rev D 229 245
- 230 9440500990 Rev D 246
- Protection Settings 246
- 9440500990 Rev D 231 247
- 232 9440500990 Rev D 248
- Gains Settings 248
- 9440500990 Rev D 233 249
- Legacy Modbus 249
- 234 9440500990 Rev D 250
- 9440500990 Rev D 235 251
- 236 9440500990 Rev D 252
- 9440500990 Rev D 237 253
- 238 9440500990 Rev D 254
- 9440500990 Rev D 239 255
- 240 9440500990 Rev D 256
- 9440500990 Rev D 241 257
- 242 9440500990 Rev D 258
- 244 9440500990 Rev D 260
- 9440500990 Rev D 245 261
- PROFIBUS Parameters 262
- 9440500990 Rev D 247 263
- 248 9440500990 Rev D 264
- 9440500990 Rev D 249 265
- 250 9440500990 Rev D 266
- 9440500990 Rev D 251 267
- 252 9440500990 Rev D 268
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- 9440500990 Rev D 299 315
- 300 9440500990 Rev D 316
- 9440500990 Rev D 301 317
- 302 9440500990 Rev D 318
- Maintenance 319
- Troubleshooting 320
- Support 321
- 306 9440500990 Rev D 322
- Maintenance DECS-250N 322
- Specifications 323
- Generator Current Sensing 324
- Accessory Inputs 325
- Contact Inputs 325
- Communication Ports 325
- Contact Outputs 326
- Field Power Output 327
- Regulation 327
- Parallel Compensation 328
- Field Protection Functions 329
- Startup 330
- Voltage Matching 331
- Data Logging (Oscillography) 332
- Environment 332
- Type Tests 332
- Physical 333
- Regulatory Standards 333
- 318 9440500990 Rev D 334
- Specifications DECS-250N 334
- Analog Expansion Module 335
- 322 9440500990 Rev D 338
- Connections 338
- 324 9440500990 Rev D 340
- AEM-2020 341
- 9440500990 Rev D 327 343
- Communications 344
- Functional Description 344
- 9440500990 Rev D 329 345
- RTD Inputs 345
- 330 9440500990 Rev D 346
- Thermocouple Inputs 346
- 9440500990 Rev D 331 347
- Analog Outputs 347
- 9440500990 Rev D 333 349
- Analog Input Values 349
- 334 9440500990 Rev D 350
- 336 9440500990 Rev D 352
- Contact Expansion Module 353
- 340 9440500990 Rev D 356
- 9440500990 Rev D 341 357
- 9440500990 Rev D 343 359
- 344 9440500990 Rev D 360
- 9440500990 Rev D 345 361
- 9440500990 Rev D 347 363
- Revision History 365
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