Figure 196: CB Manual Close System Check Logic Diagram (Modules 51 & 52) 340
Figure 197: Circuit Breaker Fail logic - part 1 351
Figure 198: Circuit Breaker Fail logic - part 2 352
Figure 199: Circuit Breaker Fail logic - part 3 353
Figure 200: Circuit Breaker Fail logic - part 4 354
Figure 201: CB Fail timing 356
Figure 202: Phase Overcurrent Protection logic diagram 362
Figure 203: Negative Phase Sequence Overcurrent Protection logic diagram 364
Figure 204: IDG Characteristic 367
Figure 205: Earth Fault Protection logic diagram 369
Figure 206: EPATR B characteristic shown for TMS = 1.0 372
Figure 207: Sensitive Earth Fault Protection logic diagram 372
Figure 208: Current distribution in an insulated system with C phase fault 373
Figure 209: Phasor diagrams for insulated system with C phase fault 374
Figure 210: Positioning of core balance current transformers 375
Figure 211: High Impedance REF principle 376
Figure 212: High Impedance REF Connection 377
Figure 213: Thermal overload protection logic diagram 379
Figure 214: Spreadsheet calculation for dual time constant thermal characteristic 380
Figure 215: Dual time constant thermal characteristic 380
Figure 216: Broken conductor logic 382
Figure 217: Undervoltage - single and three phase tripping mode (single stage) 389
Figure 218: Overvoltage - single and three phase tripping mode (single stage) 392
Figure 219: Residual Overvoltage logic 396
Figure 220: Residual voltage for a solidly earthed system 397
Figure 221: Residual voltage for an impedance earthed system 398
Figure 222: Underfrequency logic (single stage) 403
Figure 223: Overfrequency logic (single stage) 404
Figure 224: Rate of change of frequency logic (single stage) 405
Figure 225: Fault recorder stop conditions 412
Figure 226: Broken Current Accumulator logic diagram 417
Figure 227: CB Trip Counter logic diagram 418
Figure 228: Operating Time Accumulator 419
Figure 229: Excessive Fault Frequency logic diagram 420
Figure 230: Reset Lockout Alarm logic diagram 421
Figure 231: CB1 Condition Monitoring logic diagram 422
Figure 232: CB2 Condition Monitoring logic diagram 423
Figure 233: Reset Circuit Breaker Lockout Logic Diagram (Modules 57 & 58) 425
Figure 234: CB State logic diagram (Module 1) 428
Figure 235: Hotkey menu navigation 430
Table of Figures P446SV
xxviii P446SV-TM-EN-1
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