Why are Transformers Required?2021-09-30T19:09:27+00:00

The transformer’s main purpose is to change one form of voltage to another, making it possible to operate a great variety of loads at their suitable voltages.
The coils are usually wound on a core of laminated electrical steel or ferrite magnetic material.

How to Size or Specify a Transformer?2021-10-11T16:08:05+00:00

To properly size or specify a transformer the following information is generally required:

  • Input voltage to the transformer
  • kW of the power source
  • Frequency range of the power source, and at which the transformer will operate
  • Turns ratio or the output voltage required at full load (or no load)
  • Input kVA at the minimum and maximum turns ratio
  • Expected efficiency (based on the kW rating of the power source) or loss of the transformer

It is also helpful to know any unique characteristics of the power source, type of waveform, or if any DC will be present.

The more information the designer has available the more assurance the customer has of getting the proper and most efficient transformer.

Check out our Products Page to learn more about the quality magnetic products we have to offer.

Why Do Transformers Fail?2021-09-30T19:35:04+00:00

Below are some of the instances why transformers fail.

As a general rule, when transformers are water-cooled, most of the failures occur because of a breakdown of the insulation between the windings.
Typically this is due to lack of water, poor quality water, the water-inlet temperature being too high, or operating the transformer outside of its designed rating. Insulation failure is sometimes caused by the harsh environment the transformer is subjected to.

Another failure that commonly occurs would be the melting of the output connection (fishtail). This is caused by improper tightening (recommended torque is 30 to 40 ft/lb.), or maintenance on the inductor, which includes dirty and oxidized surfaces on the mating inductor or Fishtail surface.

There are occurrences when the core fails. Again, this may be due to the lack of water, poor quality water, the input volts per turn are too high (exceeds core loss temperature limitation), and improper use of frequency.

One of the best investments you can make is in a well-designed water system. This will pay for itself with reduced component failures and reduction of downtime. Proper maintenance of the inductor and transformer connections will also help greatly.

If you have experienced a transformer failure, please check out our Repair Services page.


Jackson Transformer Company is a leading designer and manufacturer
of Transformers, Inductors, Reactors, Chokes, VIT®, Transinductor®, and other magnetic products.

We have been developing, designing, and manufacturing custom water cooled and dry type magnetic products since 1955

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