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BV 1215004

Customer demand

Our customer needs a 3-phase voltage source which can generate any common three phase voltage at the push of a button. The device should be mobile and may not exceed a certain size and weight. Compliance with all DIN-standards is assumed.

Requirements:

• Output of all common three phase mains voltages at the push of a button
• Display of the current output voltage
• Fusing of all outputs
• Connection with appropriate current inrush limitation
• Mobile housing IP 23

Solution

As there was no demand on galvanic separation, we chose a three phase auto transformer - due to this choice we could also redeem the size and weight requirements.
With the help of a transformer switch relais the current inrush at start up (also during load) is avoided. The usual mains fuses won’t blow because of the start up process.
The different output voltages were done on the transformer via taps on the coils. They are lead to the outputs by means of a power stage switch.
Accordingly to the switch position of the on-load tap-changer the set output voltage as well as the load depending output current is displayed on analog instruments. Conform to customer wish, we mounted off-the-shelf 5-pin CEE sockets that are used for the inputs and outputs. The complete unit is fastened in a steel metal sheet housing (protection class IP23) with rolls for an easy transport.

Technical data

Power: 40 kVA
Frequency: 50/60 Hz
Input: 3 x 400 V
Output: 3 x 0-163-208-242-338-420-455 V
Output voltage: 3 x 50 A
Dimensions: 640 x 460 x 480 mm
Weight: 100 kg
max. unbalanced load: 10%

Alternative version

BV 30051003
2 kVA
p: 3 x 0-385-400-415-430 V
s: 3 x 400 V 2,9 A

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