Transformer on-load tap changer AT, ATV series

high-speedthree-phase17-positions

OVERVIEW 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. Technical Specifications •Compact •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 •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 •Can be mounted horizontally (AT) or vertically (ATV) Options Manufactured in accordance with IEC 60214 and also complies with many other national and international standards