High current high power variable ratio transformer

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High current high power variable ratio transformer

BV 2178008

Customer demand

For our lab we need a three phase variable ratio transformer with a minimum of 60 kVA power. The adjustable transformer should be air cooled and operated via an actuator. The output voltage has to be adjustable between 0 and 400 V without steps. The max current of 90 A has to flow in any voltage setting in the three phase system. As the design height is rather limited, a very small height is necessary. Additionally a fusing with 100 A has to be possible.


A space saving construction makes it possible to redeem the limited requirements for space as well as the electrical requirements. The core is a thin tape magnetic core with optimisation for the air gap. The windings have low skin- and proximity losses.

Technical data

Power: 66 kVA
Input: 3 x 400 V
Output: 3 x 4 up to 400 V 100 A
Length: 1100 mm
Width: 270 mm (for one phase)
Height: 270 mm
Drive: via 230 V actuator
setting time: 15 seconds
Regulation via button voltage up/voltage down

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