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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 Scheme Logic
2.1.4 Phase Undercurrent Protection
2.1.5 Thermal Overload Protection
2.1.6 Broken Conductor Protection
2.1.7 Breaker Failure Protection
2.1.8 Cold Load Protection
2.1.9 CT Requirements
2.2 Overvoltage and Undervoltage Protection
2.2.1 Phase Overvoltage Protection
2.2.2 Phase Undervoltage Protection
2.2.3 Zero Phase Sequence Overvoltage Protection
2.2.4 Negative Phase Sequence Overvoltage Protection
2.3 Frequency Protection
2.4 Trip and Alarm Signal Output
2.5 Autoreclose
2.5.1 Scheme Logic
2.5.2 Sequence Coordination
2.5.3 Setting
3.
Technical Description
3.1 Hardware Description
3.1.1 Outline of Hardware Modules
3.2 Input and Output Signals
3.2.1 AC Input Signals
3.2.2 Binary Input, Output Signals
3.2.3 Binary Output Signals
3.3 Automatic Supervision
3.3.1 Basic Concept of Supervision
3.3.2 Relay Monitoring
3.3.3 CT Failure Supervision
3.3.4 VT Failure Supervision
3.3.5 Trip Circuit Supervision
3.3.6 Circuit Breaker Monitoring
3.3.7 Failure Alarms
3.3.8 Trip Blocking
3.3.9 Setting
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