CONTENIDO
1. Introduction 17
2. Safety in Grounding 23
3. Range of Tolerable Current 27
4. Permissible Body Current Limit 31
5. Accidental Ground Circuito 35
6. Criteria of Permissible Potential Difference 43
7. Principal Design Considerations 49
8. Special Considerations for Gas-Insulated Substation (GIS) 55
9. Selection of Conductors and Joints 63
10. Soil Characteristics 71
11. Soil Structure and Selection of Soil Model 75
12. Evaluation of Ground Resistance 81
13. Determination of Maximum Ground Current 91
14. Design of Grounding System 107
15. Investigations of Transferred Potentials 119
16. Investigation of Special Danger Points 123
17. Notes on the Construction of a Grounding System 129
18. Field Measurements of a Constructed Grounding System 133
19. Physical Scale Models 139
20. Bibliography 141
APPENDIXES
Appendix A Mathematical Analysis of Gradient Problem 151
Appendix B Graphical Analysis of Square Ground Grids in Uniform Soil 175
Appendix C Sample Calculations 181
Appendix D Special Considerations for Gas-Insulated Substations: Equivalent Circuits and Calculation Notes 193
Appendix E Parametric Analysis of Grounding Systems 207
Appendix F Alphabetical Index of Definitions 223
Appendix G Auxiliary Information 225
Appendixes H-J English Translations of Seleeted Papers 241
Appendix H Fundamental Considerations on Ground Currents 241
Appendix I General Fundamentals of Electrieal Grounding Techniques 285
Appendix J Grounding Methods for High-Voltage Stat10ns with Grounded Neutrals 347
FIGURES