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De-energized tap-changers type COT

In the cable-operated tap-changers, the electrical part is separated from the mechanical part. The tap-changer comprises a cable operated mechanism outside the transformer tank, which makes connections to a selected tap of a winding inside the tank. 

COT de-energized tap-changers combine electrical and mechanical reliability with versatility of application and ease of connection to transformer tapping leads. 

Why Hitachi ABB Power Grids?

  • High class material assure the longest lifetime
  • Proven solutions with decades of successful field experience.
  • Type tested beyond international standards
  • High reliability by using few parts and low complexity in design
  • Little to no maintenance
  • Space saving designs

Product scope:

  • Oil-filled three-phase distribution transformers
  • Range: Um ≤ 36 kV, Ir ≤ 63 A
  • Compliant with IEC standards
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