3.3 Application Notes 393
3.3.1 Overvoltage Setting Guidelines 393
4 Compensated Overvoltage 394
5 Residual Overvoltage Protection 395
5.1 Residual Overvoltage Protection Implementation 395
5.2 Residual Overvoltage Logic 396
5.3 Application Notes 396
5.3.1 Calculation for Solidly Earthed Systems 396
5.3.2 Calculation for Impedance Earthed Systems 397
5.3.3 Setting Guidelines 398
Chapter 15 Frequency Protection Functions 399
1 Chapter Overview 401
2 Frequency Protection 402
2.1 Underfrequency Protection 402
2.1.1 Underfrequency Protection Implementation 402
2.1.2 Underfrequency Protection logic 403
2.1.3 Application Notes 403
2.2 Overfrequency Protection 403
2.2.1 Overfrequency Protection Implementation 403
2.2.2 Overfrequency Protection logic 404
2.2.3 Application Notes 404
3 Independent R.O.C.O.F Protection 405
3.1 Indepenent R.O.C.O.F Protection Implementation 405
3.2 Independent R.O.C.O.F Protection Logic 405
Chapter 16 Monitoring and Control 407
1 Chapter Overview 409
2 Event Records 410
2.1 Event Types 410
2.1.1 Opto-input Events 411
2.1.2 Contact Events 411
2.1.3 Alarm Events 411
2.1.4 Fault Record Events 412
2.1.5 Maintenance Events 412
2.1.6 Protection Events 412
2.1.7 Security Events 413
2.1.8 Platform Events 413
3 Disturbance Recorder 414
4 Measurements 415
4.1 Measured Quantities 415
4.2 Measurement Setup 415
4.3 Fault Locator 415
4.4 Opto-input Time Stamping 415
5 CB Condition Monitoring 416
5.1 Broken Current Accumulator 417
5.2 CB Trip Counter 418
5.3 CB Operating Time Accumulator 419
5.4 Excessive Fault Frequency Counter 420
5.5 Reset Lockout Alarm 421
5.6 CB Condition Monitoring Logic 422
5.7 Reset Circuit Breaker Lockout 423
5.7.1 Reset CB Lockout Logic Diagram 425
5.8 Application Notes 425
5.8.1 Setting the Thresholds for the Total Broken Current 425
5.8.2 Setting the thresholds for the Number of Operations 426
Contents P446SV
x P446SV-TM-EN-1
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