Heavy Collaring Cell for SF6 switch-gear applications


In an electric power system, switchgear is composed of electrical disconnect switches, fuses or circuit breakers used to control, protect and isolate electrical equipment and high-voltage power lines.

In SF6 switchgear, the current interruption in a high-voltage circuit breaker is obtained by separating two contacts in a medium gas, such as sulfur hexafluoride (SF6).

According to customer needs, T-DRILL has developed the collaring cell for SF6 switchgear houses. After T-DRILL process, they are ready for next step (end flanges welding) in SF6 switch-gear production.

Key Features:

  • SF6 house (Pipe) handling, turning and positioning according to customers work piece.
  • T-DRILL heavy collaring process, maximum collar size ~850 mm (smaller model ~600 mm)
  • Cutting of pilot holes and trimming of the collars by Plasma cutter or Cutting blades.
  • Individual clamping molds for each run pipe/collar variant ensures the maximum quality.
  • Suitable materials e.g. Carbon steel, Stainless steel, Aluminum.
  • Pre-heating of a material by gas burners, if necessary.
  • Applicable switchgear voltage classes e.g. 35kV, 110kV, 220kV, 500kv.


An example of delivered SF6 switchgear project machine:

T-850 Collaring/branching Station


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