Transmission Line Tower Grounding - The Secrets You Never Knew

Transmission Line Tower Grounding - The Secrets You Never Knew




TABLE OF CONTENTS


1.0 Introduction 3


1.1 Safety analysis on overhead line structure 4


1.2 Grounding screen structure of overhead line structure 4


1.3 Effects of seasonal factors on safety performance of ground screen 4



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, analysis on corrosion


2.0 Analysis of corrosion 5


2.1 Analysis of resistance reduction 5


2.2 Component of ground resistance 5


2.3 Measurement of soil resistivity 6


2.3.1 Introduction to soil resistivity measurement 6


2.3.2 Sampling analysis method of soil resistivity 7


2.4 Function of grounding devices 8


2.4.1 Concept of grounding 8


2.4.2 Grounding devices 9


2.4.3 Grounding resistance 9


2.4.4 Grounding classification 9


2.4.5 Working grounding 10-11


2.4.6 Protective grounding 12


2.4.7 Lighting interference grounding 12


2.4.8 Signal reference grounding 13


2.4.9 Why ground a transmission line? 13




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, 2.4.9.1 Ensure safety operation of power systems 13


2.4.9.2 Ensure personal safety 14


2.4.9.3 Elimination of electrostatic accidents 14


2.4.9.4 Detecting ground faults 15


2.4.9.5 Equipotential bonding 16


2.4.9.6 Reducing electromagnetic interference 16


2.5.0 Working grounding 17


2.5.1 Grounding resistance 18


2.5.2 Relationship btw grounding resistance and capacitance. 221.1


3.0 Conclusion 24




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