VACUTAP® VBO®

The first resistor-type bolt-on tap-changer in vacuum technology

VACUTAP® VBO® is the first resistor-type, bolt-on on-load tap-changer (OLTC) in vacuum technology offering all advantages of this established technology enriched with further possibilities by an innovative direct drive system. VACUTAP® VBO® is retrofit-compatible, flange mounting and winding connection are identical to existing AT on-load tap-changer design. Innovative direct-drive technology eliminates drive shafts or bevel gears and enables a remote and flexible installation of the drive control cabinet.

Your Advantages at a Glance

  1. VACUTAP® technology offers nearly maintenance-free on-load tap-changers for all electrical energy supply applications

  2. State of the art intelligent direct drive offers maximum flexibility

  3. 1:1 retrofit of corresponding AT-type OLTCs possible

  4. Remote installation of motor control cabinet

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Product Information

Number of phases III
Max. rated through-current Ir 400 A
Rated short-time withstand current 4 kA
Rated short-circuit duration 3 s
Rated peak withstand current 10 kA
Max. rated step voltage Uir 825 V
Step capacity PStN 330 kVA
Rated frequency 50…60 Hz
Number of positions without COS*: 17 / with COS*: 33
Motor-drive ETOS® ID, direct drive
Rated voltage level
Highest voltage for equipment Um
40 kV
Rated lightning impulse withstand voltage [1.2/50 μs] 200 kV
Rated short-duration power frequency withstand voltage 50 Hz, 1 min] 70 kV
* COS = Change-over selector
Technical data
Number of phases III
Max. rated through-current Ir 400 A
Rated short-time withstand current 4 kA
Rated short-circuit duration 3 s
Rated peak withstand current 10 kA
Max. rated step voltage Uir 825 V
Step capacity PStN 330 kVA
Rated frequency 50…60 Hz
Number of positions without COS*: 17 / with COS*: 33
Motor-drive ETOS® ID, direct drive
Rated voltage level
Highest voltage for equipment Um
40 kV
Rated lightning impulse withstand voltage [1.2/50 μs] 200 kV
Rated short-duration power frequency withstand voltage 50 Hz, 1 min] 70 kV
* COS = Change-over selector

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