The AT and ATV range of single 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 positions (16 steps) 15 possible for linear regulation and 33 tapping positions (32 steps) for reversing of course/fine regulation.
The AT tapchanger is designed such that power flow can be handled in either direction at full-rated current. The AT is a flange-mounted tapchanger where the oil in the switch compartment is kept separate at all times from the oil in the main transformer.
•Linear, reversing or coarse/fine versions
•Suitable for 52kV, star or delta windings
•400A version (linear only)
•Suitable for 145kV star winding (neutral end only)
•Single-phase version available
•Vertically-mounted option also available
•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
•Can be mounted horizontally (AT) or vertically (ATV)
Manufactured in accordance with IEC 60214 and also complies with many other national and international standards