3.5 Password Entry 75
3.6 Processing Alarms and Records 75
3.7 Menu Structure 76
3.8 Changing the Settings 77
3.9 Direct Access (The Hotkey menu) 78
3.9.1 Setting Group Selection Using Hotkeys 78
3.9.2 Control Inputs 78
3.9.3 Circuit Breaker Control 79
3.10 Function Keys 79
4 Date and Time Configuration 81
4.1 Using an SNTP Signal 81
4.2 Using an IRIG-B Signal 81
4.3 Using an IEEE 1588 PTP Signal 81
4.4 Without a Timing Source Signal 82
4.5 Time Zone Compensation 82
4.6 Daylight Saving Time Compensation 83
5 Settings Group Selection 84
Chapter 6 Current Protection Functions 85
1 Chapter Overview 87
2 Overcurrent Protection Principles 88
2.1 IDMT Characteristics 88
2.1.1 IEC 60255 IDMT Curves 89
2.1.2 European Standards 91
2.1.3 North American Standards 92
2.1.4 IEC and IEEE Inverse Curves 94
2.1.5 Differences Between the North american and European Standards 95
2.1.6 Programmable Curves 95
2.2 Principles of Implementation 95
2.2.1 Timer Hold Facility 96
3 Phase Overcurrent Protection 98
3.1 Phase Overcurrent Protection Implementation 98
3.2 Non-Directional Overcurrent Logic 99
3.3 Directional Element 100
3.3.1 Directional Overcurrent Logic 101
3.4 Application Notes 102
3.4.1 Parallel Feeders 102
3.4.2 Ring Main Arrangements 103
3.4.3 Setting Guidelines 103
3.4.4 Setting Guidelines (Directional Element) 104
4 Voltage Dependent Overcurrent Element 105
4.1 Voltage Dependent Overcurrent Protection Implementation 105
4.1.1 Voltage Controlled Overcurrent Protection 105
4.1.2 Voltage Restrained Overcurrent Protection 106
4.2 Voltage Dependent Overcurrent Logic 107
4.3 Application Notes 107
4.3.1 Setting Guidelines 107
5 Current Setting Threshold Selection 109
6 Cold Load Pickup 110
6.1 Implementation 110
6.2 CLP Logic 111
6.3 Application Notes 111
6.3.1 CLP for Resistive Loads 111
6.3.2 CLP for Motor Feeders 111
6.3.3 CLP for Switch Onto Fault Conditions 112
7 Selective Logic 113
7.1 Selective Logic Implementation 113
P14x Contents
P14xEd1-TM-EN-1 iii
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