Contents
The role of "Ground Fault Protection" 3
1.1. Safety and availability 3
1.2. Safety and installation standards 3
1.2.1. The IEC 60 364 standard 3
1.2.2. The National Electric Code (NEC) 6
1.3. The role and functions of "Ground Fault Protection" 8
1.3.1. Earthing system 8
1.3.2. RCD and GFP 9
The GFP technique 10
2.1. Implementation in the installation 1 0
2.2. GFP coordination 1 2
2.2.1. Discrimination between GFP devices 1 2
2.2.2. Discrimination between upstream GFP devices
and downstream SCPDs 1 3
2.2.3. ZSI logical discrimination 1 3
2.3. Implementing GFP coordination 1 5
2.3.1. Application examples 1 5
2.4. Special operations of GFP devices 1 6
2.4.1. Protecting generators 1 6
2.4.2. Protecting loads 1 6
2.4.3. Special applications 1 7
GFP implementation 18
3.1. Installation precautions 1 8
3.1.1. Being sure of the earthing system 1 8
3.2. Operating precautions 1 9
3.2.1. Harmonic currents in the neutral conductor 1 9
3.2.2. Incidences on GFP measurement 20
3.3. Applications 21
3.3.1. Methodology 21
3.3.2. Application: implementation in a single-source TN-S system 21
3.3.3. Application: implementation in a multisource TN-S system 22
Study of Multisource Systems 24
4.1. A multisource system with a single earthing 24
4.1.1. Diagram 2 24
4.1.2. Diagrams 1 and 3 28
4.2. A multisource system with several earthings 29
4.2.1. System study 30
4.2.2. Solutions 31
Conclusion 34
5.1. Implementation 34
5.2. Wiring diagram study 34
5.2.1. Single-source system 34
5.2.2. Multisource / single-ground system 35
5.2.3. Multisource / multiground system 35
5.3 Summary table 36
5.3.1. Depending on the installation system 36
5.3.2. Advantages and disadvantages depending on the type of GFP 36
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