This Code has stated the fundamental principles on the power system relaying protection and security automatic equipment. These principles shall be executed by related scientific research, design, manufacture, construction and operation departments.
This Code is applicable to the relaying protection in power equipment and circuits and the security automatic equipment that are used in the 3kV-or-higher power system.
Preface 3
1. Scope 4
2. Normative References 4
3. General Provisions 5
4 Relaying Protection 7
4.1 General 7
4.2 Generator Protection 14
4.3 Power Transformer Protection 25
4.4 3KV-10KV Circuit Protection 32
4.5 35kV-66kV Circuit Protection 35
4.6 110kV-220kV Circuit Protection 38
4.7 330kV-500kV Circuit Protection 43
4.8 Busbar Protection 46
4.9 Breaker Failure Protection 49
4.10 Remote Tripping Protection 51
4.11 Electric Condenser Group Protection 53
4.12 Parallel Reactor Protection 56
4.13 Asynchronous Motor and Synchromotor Protection 57
4.14 Direct-current Transmission System Protection 59
5. Security Automatic Equipment 63
5.1 General Principles 63
5.2 Auto Reclosing 64
5.3 Automatic Switching-in of the Backup Power 68
5.4 Transient Stable Control and Out-of-step Stepout 70
5.5 Frequency and Voltage Abnormity Emergency Control 71
5.6 Auto-excitation Regulation 74
5.7 Automatic Deexcitation 76
5.8 Fault Recording and Fault Information Management 76
6. Requirements on Related Circuits and Equipment 78
6.1 Secondary Circuits 78
6.2 Current Transformer and Voltage Transformer 81
6.3 DC Power Supply 84
6.4 Coordination and Interphase between the Protection and the Service-station Automatic System 85
6.5 EMC 86
6.6 Breaker and Disconnecting Switches 89
6.7 Relaying Protection and Security Automatic Equipment Channel 90
Annex A 94
Minimum Sensitivity Factor of Short-circuit Protection 94
Annex B 98
Requirements on Protective Equipment Immunity Test 98
