Substation earthing design

Substation earthing design

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Substation earthing is critical both to the operational performance of the power system, and the provision of a safe working environment. It is a salient area of design when either constructing a new substation or extending or modifying an existing substation. Substation earthing is a highly specialist subject in its own right, and therefore this chapter will provide an overview of the basic theory and key requirements, relevant to power network construction, as summarised below: Objectives and regulations, Resistivity, Earth electrode systems, Earthing conductors and earth mats, Earthing system and earth fault current, Voltage limits, Practical considerations, Earthing design considerations.

Chapter Contents:

  • 12.1 Introduction
  • 12.2 Objectives and regulations
  • 12.2.1 Historical
  • 12.2.2 Regulatory requirements
  • 12.2.3 Substation earthing objectives
  • 12.3 Earth resistivity
  • 12.3.1 Resistivity
  • 12.4 Earth electrode systems
  • 12.4.1 Types of electrodes
  • 12.4.2 Driven vertical rods
  • 12.4.3 Buried horizontal or vertical plate
  • 12.4.4 Buried horizontal wire (or strip)
  • 12.4.5 Buried horizontal grid
  • 12.4.6 Multiple-driven vertical rods
  • 12.4.7 Combined horizontal grid with vertical rods
  • 12.5 Earth conductors and earth mat
  • 12.5.1 Earthing conductor — considerations
  • 12.5.2 Earth mat connections
  • 12.6 Earthing system and earth fault current
  • 12.6.1 Earthing system
  • 12.6.2 Earth system impedance
  • 12.6.3 Earth fault current
  • 12.7 Voltage limits
  • 12.7.1 Substation ROEP — voltage design limits
  • 12.7.2 Transferred potential
  • 12.7.3 Touch potential
  • 12.7.4 Third-party infrastructure
  • 12.8 Earthing design — considerations and requirements
  • 12.8.1 Substation fence earthing
  • 12.8.2 High-frequency earths
  • 12.8.3 Indoor substations
  • 12.8.4 Reactive compensation compounds
  • 12.8.5 Test facilities
  • 12.8.6 Earthing design method
  • 12.8.7 Computer-based solutions
  • 12.8.8 Standard documentation

Inspec keywords: earthing; fault currents; conductors (electric); substations

Other keywords: power network construction; earth mats; earthing design considerations; power system; voltage limits; substation earthing design; resistivity; earthing conductors; earth electrode systems; earth fault current; operational performance

Subjects: Power transmission lines and cables; Substations; Power system protection

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