4 Performance of Voltage Protection Functions 541
4.1 Undervoltage Protection 541
4.2 Overvoltage Protection 541
4.3 Residual Overvoltage Protection 541
4.4 Negative Sequence Voltage Protection 541
4.5 Rate of Change of Voltage Protection 542
5 Performance of Frequency Protection Functions 543
5.1 Basic Overfrequency Protection 543
5.2 Basic Underfrequency Protection 543
5.3 Advanced Overfrequency Protection 543
5.4 Advanced Underfrequency Protection 544
5.5 Supervised Rate of Change of Frequency Protection 544
5.6 Independent Rate of Change of Frequency Protection 544
5.7 Average Rate of Change of Frequency Protection 545
5.8 Load Restoration 545
6 Power Protection Functions 546
6.1 Overpower / Underpower Protection 546
6.2 Sensitive Power Protection 546
7 Performance of Monitoring and Control Functions 547
7.1 Voltage Transformer Supervision 547
7.2 Standard Current Transformer Supervision 547
7.3 CB State and Condition Monitoring 547
7.4 PSL Timers 547
8 Measurements and Recording 548
8.1 General 548
8.2 Disturbance Records 548
8.3 Event, Fault and Maintenance Records 548
8.4 Fault Locator 548
9 Ratings 549
9.1 AC Measuring Inputs 549
9.2 Current Transformer Inputs 549
9.3 Voltage Transformer Inputs 549
9.4 Auxiliary Supply Voltage 549
9.5 Nominal Burden 550
9.6 Power Supply Interruption 550
9.7 Battery Backup 551
10 Input / Output Connections 552
10.1 Isolated Digital Inputs 552
10.2 Nominal Pickup and Reset Thresholds 552
10.3 Standard Output Contacts 552
10.4 High Break Output Contacts 553
10.5 Watchdog Contacts 553
11 Mechanical Specifications 554
11.1 Physical Parameters 554
11.2 Enclosure Protection 554
11.3 Mechanical Robustness 554
11.4 Transit Packaging Performance 554
12 Type Tests 555
12.1 Insulation 555
12.2 Creepage Distances and Clearances 555
12.3 High Voltage (Dielectric) Withstand 555
12.4 Impulse Voltage Withstand Test 555
13 Environmental Conditions 556
13.1 Ambient Temperature Range 556
13.2 Temperature Endurance Test 556
13.3 Ambient Humidity Range 556
P14x Contents
P14xEd1-TM-EN-1 xvii
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