This guide is formulated with a view to standardizing the earthing design of hydropower plant to ensure the safety of personnel and equipment when the power system is operating under normal or faulty conditions， and to make earthing design technically advanced and cost-effective.
This guide is applicable to the earthing design of all electrical installations and facilities in hydropower plants.
This guide specifies the general principles， procedures and methods of the earthing design for hydropower plants and the measurement of power frequency parameters of the earthing system. In the earthing design for hydropower plants， an overall earthing design scheme shall be developed according to local conditions.
In addition to this guide， the earthing design of hydropower plants shall comply with other current relevant standards of China.
目錄：
1 General Provisions
2 Terms
3 Principles and Procedures of Earthing Design
3．1 Principles of Earthing Design
3．2 Procedures of Earthing Design
4 Earthing Resistance
4．1 Earthing Resistance of Effective Earthing System
4．2 Earthing Resistance of Non-direct Earthing System
4．3 Earthing Resistance of Low Voltage Systems
4．4 Earthing Resistance of Poles and Towers
5 Measures to Reduce Earthing Resistance
5．1 Underwater Earthing
5．2 Lead-Out Earthing
5．3 Deep Well Earthing
5．4 Artificial Resistance Reduction
6 Earthing Resistance Calculation
6．1 Power Frequency Earthing Resistance Calculation
6．2 Impulse Earthing Resistance Calculation
7 Equalizing Potential Calculations
7．1 Equalizing Potential Network Design
7．2 Allowable Values of Touch Potential Difference and Step Potential Difference
7．3 Touch Potential Difference and Step Potential Difference Calculation
8 Transferred Potential Isolation
9 Special Requirements for Equipment Earthing
9．1 GIS Earthing
9．2 IPB Earthing
9．3 High Voltage Cable Lines Earthing
9．4 Transformer Neutral Point Earthing
9．5 Control System， Protection System， Communication System and Monitoring System Earthing
9．6 Protective Conductors
9．7 Equipotential Bonding Conductors
9．8 Mobile Power Equipment Earthing
9．9 Portable Power Equipment Earthing
10 Earthing Device
10．1 Earthing Body
10．2 Earthing Conductors
10．3 Earthing Connection
10．4 Earthing Sign
11 Section Selection and Anticorrosion of Earthing Conductor
11．1 Section Selection and Calculation
11．2 Earthing Conductor Anticorrosion
12 Measurement of Earthing Device Power Frequency Parameters
12．1 Earthing Resistance Measurement
12．2 Touch Potential Difference and Step Potential Difference Measurement
12．3 Soil Resistivity Measurement
12．4 Water Resistivity Measurement
12．5 Four-Electrode Method and Apparent Resistivity Curve
Appendix A Earthing Resistance Calculation in Non-uniform soil
Appendix B Earthing Device Potential Calculation
Appendix C Impulse Coefficient of Independent Earthing Conductor
Appendix D Determination of Attenuation Coefficient of Surface Soil Layer
Appendix E Calculation Method of Coefficient k
Appendix F Iypical Resistivity of Soil， Water and Rock
Explanation of Wording in This Guide
List of Quoted Standards
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