Gas Insulated Switchgear

General Rules for GIS Grounding and bonding

In most GIS there are two grounding grids:

  1. The station grounding grid, which is similar to a typical AIS installation.
  2. The GIS grounding mesh, which is a narrowly spaced grounding grid embedded into the concrete slab in which the GIS is installed.

GIS grounding and bonding typical rule:

  • All grounding conductors should be as short as possible.
  • The grounding mesh and interconnections should be capable of carrying the system’s fault currents.
  • All exposed grounding conductors should be protected against mechanical damage.
  • Proper grounding and bonding techniques, such as multiple conductors or voltage limiters, are required at all discontinuities within the GIS.
  • Ensure all metallic building components, GIS support structures, and GIS maintenance platforms are properly grounded.
  • Reinforcement steel in the building floor should be connected to the GIS grounding mesh to further equalize ground potentials.
  • All secondary cables should be shielded with both ends of each cable shield grounded to mitigate possible electromagnetic interference.

In pic show a connecting of the insulation between the metal enclosure of a GIS and the metal part of the cable by means of nonlinear resistors.

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