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AT Tapchanger

The ‘AT’ range of single-phase compartment units with high-speed resistor transition is designed for three-phase systems with voltages of 44kV and 66kV line end or 132kV neutral end and nominal rated current of 300A. A maximum of 17 tapping steps (18 positions) is possible for linear regulation and 32 steps (33 positions) for reversing or coarse/fine regulation.

The ‘AT’ tapchanger is designed such that power flow can be handled in either direction at full-rated current. The ‘AT’ is an "out-of-tank" flange-mounted tapchanger where the oil in the switch compartment is kept separate at all times from the oil in the main transformer.

  • Compact
  • Linear, reversing or coarse/fine versions
  • Suitable for 1kV, 33kV or 66kV systems, star or delta windings
  • 400A version (linear only)
  • Suitable for 132kV star winding (neutral end only)
  • Single-phase version available
  • Vertically-mounted option also available
  • Manufactured in accordance with IEC 60214 and also complies with many other national and international standards

AE Tapchanger

The ‘AE’ series on-load tapchanger’s are the results of the successful type ‘AT’ range of designs. The ‘AE’ uses many common parts from the ‘AT’ including the complete drive mechanism. This range has a maximum of 17 tapping steps (18 positions) is possible for linear regulation and 32 steps (33 positions) for reverse or course/fine regulation. The equipment may be used to regulate three-phase transformers designed for system voltages of 33kV and 66kV at any position in the winding. The ’AE’ may also operate on transformers designed for 132kV earthed neutral three-phase systems regulating at the neutral end of the winding. The maximum current rating is 500A, with overload capability in accordance with IEC 60354 and IEC 60076-7.

  • 500A current rating
  • Suitable for 33kV or 66kV systems, line or neutral end
  • Suitable for 132kV systems (neutral end only)
  • Maximum 650kVA breaking capacity
  • Designed in accordance with IEC 60214 and also complies with many other national and international standards.

Benefits of the AT, ATV, and AE on-load Tapchanger’s

  • Lower overall maintenance times and costs to end user
  • Separate tapchanger oil ensures 100% accurate D.G.A of transformers
  • Can easily be housed in noise enclosures.
  • Retrofit tapchangers more easily accommodated
  • Better for anti-tracking surfaces
  • Filter plant not required
  • Transformer tank size minimised

Key Features of AT and AE Tapchanger’s

  • Compact
  • Bi-directional power flow
  • High Speed Resistor on-load selector switch
  • Ease of maintenance
  • Low oil content
  • Up to 17 positions (linear) or 33 positions (reverse or coarse/fine)
  • Fully automatic or manual operation

Click here to download Tapchanger data sheets