1 Scope
This Standard specifies measurement method for railway integrated grounding system with regard to terms and definitions, general requirements, as well as the measurement methods for earth resistivity, ground resistance of separate ground electrode, electric integrity of railway integrated grounding system (RIGS), RIGS earth resistivity, surface potential distribution (gradient), step voltage and touch voltage, RIGS track potential, and equipment potential.
2 Normative References
The following documents are essential for the application of this Standard. For the dated normative references, only the dated editions are applicable to this document. For the undated normative references, the latest editions (including all amendments) apply.
GB/T 17949.1-2000 Guide for Measuring Earth Resistivity, Ground Impedance and Earth Surface Potentials of a Ground System - Part 1: Normal Measurements.
DL/T 475-2006 Guide for Measurement of Grounding Connection Parameters
TB/T 3074-2003 Technical Specification for Protection against Lightning Electromagnetic Impulse on Railway Signaling Equipment
1 Scope
2 Normative References
3 Terms and Definitions
4 General Requirements
4.1 Measurement Items
4.2 Environment Requirements for Measurement
4.3 Safety Requirements for Measurement
4.4 Evaluation on Measurement Results
5 Measurement of Earth Resistivity
5.1 Measurement Method
5.2 Testing Instrument
6 Measurement for Ground Resistance Of Separate Ground Electrode
6.1 Measuring Range
6.2 Measurement Arrangement
6.3 Testing Instrument
6.4 Three-point Straight-line Method
6.5 Three-point Angle-offset Method
7 Measurement for RIGS Electric Integrity
7.1 Measuring Range
7.2 Measurement Method
7.3 Testing Instrument
7.4 Judgment and Treatment of Measurement Results
8 Measurement of RIGS Ground Impedance
8.1 Selection of Measurement Method
8.2 Measurement Arrangement
8.3 Test Current
8.4 Testing Instrument
8.5 Measurement Spacing
8.6 Reverse Distant Method for Ground Impedance Measurement
8.7 Compensation Method for Ground Impedance Measurement
8.8 Fall-of-potential Method for Ground Impedance Measurement
9 Measurement of Surface Potential Distribution, Step Voltage and Touch Voltage
9.1 Measurement for Surface Potential Distribution
9.2 Measurement of Step Potential Difference, Step Voltage, Touch Potential Difference and Contact Voltage
10 Measurement of RIGS Track Potential And Equipment Potential
10.1 Basic Requirements
10.2 Measurement Method
Appendix A (Informative) Measurement Items and Cycles
Appendix B (Informative) Surface Potential Distribution of Earthing Installation
Appendix C (Informative) Allowable Values of Touch Voltage and Track Potential
