2.1 Unit Protection 100
2.2 Current Differential Protection Principles 100
2.3 Through Fault Stability 101
2.4 Bias Current Compensation 101
3 Busbar Multiple Tripping Criteria 103
3.1 Tripping Criteria DDBs 103
3.2 Topology Replica Function 104
3.3 Topology Replica Function DDBs 105
3.4 Zone Current Differential Elements 106
3.5 Check Zone 106
3.5.1 Check Zone Supervision 107
3.5.2 Auxiliary Contacts Discrepancy 107
3.6 Continuous Supervision of Current Circuits (Circuitry Fail) 107
3.7 Current Phase Comparison Check 108
3.8 Optional Voltage Criteria 109
3.9 Instantaneous or Delayed Tripping 109
3.10 Dead Zone (Blind Spot) Protection 109
3.11 Dead Zone (Blind Spot) Protection Logic 110
3.12 Dead Zone (Blind Spot) Protection DDBs 110
4 Circuit Breaker Fail Protection 111
4.1 Circuit Breaker Fail Implementation 111
4.2 Circuit Breaker Fail Logic 111
4.3 CB Fail Settings 113
4.4 CB Fail DDB signals 114
5 Backup Overcurrent Protection 116
5.1 Overcurrent 1 Settings 116
5.2 Overcurrent 2 Settings 121
5.3 Overcurrent DDB signals 133
6 Configuring the Busbar Protection 137
6.1 Example of Configuring the Busbar Protection 137
Chapter 6 Monitoring and Control 141
1 Chapter Overview 143
2 Event Records 144
2.1 Event Records Table 144
2.2 Event Types 151
2.2.1 Opto-input Events 152
2.2.2 Contact Events 152
2.2.3 Alarm Events 152
2.2.4 Fault Record Events 155
2.2.5 Maintenance Events 156
2.2.6 Protection Events 157
2.2.7 Security Events 157
2.2.8 Platform Events 158
2.3 View Records Column 158
3 Disturbance Recorder 161
4 Measurements 162
4.1 Measured Quantities 162
4.1.1 Measured and Calculated Currents 162
4.1.2 Measured and Calculated Voltages 162
4.1.3 Power and Energy Quantities 162
4.1.4 Demand Values 163
4.1.5 Frequency Measurements 163
4.1.6 Other Measurements 163
4.2 Measurement Setup 163
4.3 Measurement Tables 164
MiCOM P747 Contents
P747-TM-EN-1 iii
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