Toshiba GRD140, Инструкция по эксплуатации

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Contents
Safety Precautions 1
1. Introduction 8
2. Application Notes 10
2.1 Overcurrent and Undercurrent Protection 10
2.1.1 Non-directional Overcurrent Protection 10
2.1.2 Directional Overcurrent Protection 17
2.1.3 Scheme Logic 21
2.1.4 Phase Undercurrent Protection 44
2.1.5 Thermal Overload Protection 46
2.1.6 Broken Conductor Protection 49
2.1.7 Breaker Failure Protection 52
2.1.8 Cold Load Protection 55
2.1.9 CT Requirements 58
2.2 Overvoltage and Undervoltage Protection 60
2.2.1 Phase Overvoltage Protection 60
2.2.2 Phase Undervoltage Protection 63
2.2.3 Zero Phase Sequence Overvoltage Protection 66
2.2.4 Negative Phase Sequence Overvoltage Protection 69
2.3 Frequency Protection 71
2.4 Trip and Alarm Signal Output 73
2.5 Autoreclose 75
2.5.1 Scheme Logic 75
2.5.2 Sequence Coordination 76
2.5.3 Setting 77
3. Technical Description 80
3.1 Hardware Description 80
3.1.1 Outline of Hardware Modules 80
3.2 Input and Output Signals 84
3.2.1 AC Input Signals 84
3.2.2 Binary Input, Output Signals 84
3.2.3 Binary Output Signals 88
3.3 Automatic Supervision 89
3.3.1 Basic Concept of Supervision 89
3.3.2 Relay Monitoring 89
3.3.3 CT Failure Supervision 90
3.3.4 VT Failure Supervision 91
3.3.5 Trip Circuit Supervision 92
3.3.6 Circuit Breaker Monitoring 93
3.3.7 Failure Alarms 94
3.3.8 Trip Blocking 95
3.3.9 Setting 96