On-load tap changer for transformer
Brush HMA

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