L/C Magnetics provides a cost affective solution for many Buck-Boost Transformer Applications. One such transformer is described below.

Voltage available for a 100 KVA output : 460 VAC, 3 PH (X1, X2, X3)

Voltage desired for a 100 KVA output: 480 VAC, 3 PH (H1, H2, H3)

The size of the auto transformer would be 480-460/480 * 100 KVA = 4.2 KVA approx.

Schematic of a 3 phase Buck-Boost Transformer

Hence a 4.2 KVA Buck-Boost transformer will boost the 460 VAC, 100 KVA input to 480 VAC, 100 KVA output. The customer has to buy a cheaper 4.2 KVA unit instead of replacing the existing 100 KVA unit as shown below.

Buck-Boost Transformers shown above do not provide the isolation between primary and secondary, which is provided by an Isolation Transformer only.

Buck-Boost transformer shown above is used as an auto transformer. It may not be a solution for all applications. Check with your electrician and city codes to see if an auto transformer is suitable for your application.

There are instances, when a distribution transformer output is lower than nominal. One solution is to replace the Distribution transformer with a new one. This can be costly. Auto Transformers are very useful in such applications. Auto Transformer is able to boost the output to the nominal value. The distribution transformer provides the necessary isolation, and auto transformer remedies the drop in the output voltage. This results in huge savings.

Auto Transformer
263.5KVA, 3PH 50/60 Hz
Input: 380/400/415 VAC
Output: 456/480/504 VAC

If you wish to step up or step down your output voltage, a customized auto transformer can offer you substantial savings. We can install the auto transformer in a suitable NEMA enclosure also. To discuss your specific application, please call us toll-free at (800) 595-7096.