Ground Fault Protection - engineering site - Schneider Electric

ContentsThe role of “Ground Fault Protection” 31.1. Safety and availability 31.2. Safety and installation standards 41.2.1. The IEC 60 364 standard 41.2.2. The National Electric Code (NEC) 71.3. The role and functions of “Ground Fault Protection” 91.3.1. Earthing system 91.3.2. RCD and GFP 9The GFP Technique 102.1. Implementation in the installation 102.2. GFP coordination 122.2.1. Discrimination between GFP devices 22.2.2. Discrimination between upstream GFP devices anddownstream SCPDs32.2.3. ZSI Logical discrimination 42.3. Implementing GFP coordination 152.3.1. Application examples 52.4. Special operations of GFP devices 162.4.1. Protecting generators 62.4.2. Protecting loads 72.4.3. Special applications 73.1. Installation precautions 183.1.1. Being sure of the earthing system 83.2. Operating Precautions 203.2.1. Harmonic currents in the neutral conductor 203.2.2. Incidences on GFP measurement 213.3. Applications 223.3.1. Methodology 223.3.2. Application: implementation in a single-source TN-S system 223.3.3. Application: implementation in a multisource TN-S system 23Study of multisource systems 244.1. A multisource system with a single earthing 244.1.1. Diagram 2 244.1.2. Diagrams 1 and 3 284.2. A multisource system with several earthings 304.2.1. System study 304.2.2. Solutions 31Conclusion 345.1. Implementation 345.2. Wiring diagram study 345.2.1. Single-source System 345.2.2. Multisource / single-ground system 355.2.3. Multisource / multiground system 355.3 Summary table 365.3.1. Depending on the Installation system 365.3.2. Advantages and disadvantages depending on the type of GFP 36