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Contents
Safety Precautions
1.
Introduction
2.
Application Notes
2.1 Overcurrent and Undercurrent Protection
2.1.1 Non-directional Overcurrent Protection
2.1.2 Directional Overcurrent Protection
2.1.3 Phase Undercurrent Protection
2.1.4 Thermal Overload Protection
2.1.6 Breaker Failure Protection
2.1.7 Countermeasures for Magnetising Inrush
2.1.8 CT Requirements
2.2 Overvoltage and Undervoltage Protection
2.2.1 Phase Overvoltage Protection
2.2.2 Phase Undervoltage Protection
2.1.1.1 Inverse Time Overcurrent Protection
2.1.1.2 Definite Time Overcurrent Protection
2.1.1.3 Instantaneous Overcurrent Protection
2.1.1.4 Staged Definite Time Overcurrent Protection
2.1.1.5 Scheme Logic
2.1.1.6 Setting
2.1.1.7 Sensitive Earth Fault Protection
2.1.1.8 Negative Sequence Overcurrent Protection
2.1.1.9 Application of Protection Inhibits
2.1.2.1 Application of Directional Overcurrent Protection
2.1.2.2 Directional Characteristics
2.1.2.2 Scheme Logic
2.1.2.3 Setting
2.1.2.4 Directional Sensitive Earth Fault Protection
2.1.2.5 Directional Negative Sequence Overcurrent Protection
2.1.2.6 Blocked Busbar Protection
2.1.7.1 Inrush Current Detector
2.1.7.2 Cold Load Protection
2.1.8.1 Phase Fault and Earth Fault Protection
2.1.8.3 Sensitive Earth Fault Protection
2.1.8.4 Restricted Earth Fault Protection
2.2.1.1 Inverse Time Overvoltage Protection
2.2.1.2 Definite Time Overvoltage Protection
2.2.1.3 Setting
2.2.2.1 Inverse Time Undervoltage Protection
2.2.2.2 Definite Time Undervoltage Protection
2.2.2.3 Setting
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