Buying The Right Kind Of Power Transformers


A myriad of transformers wait for you when you go shopping for them. There’s a whole lot of transformer types you’ll have to choose from, including power, toroidal, isolation, audio, EI, UI, and more. But, out of the lot, power transformers, with their outstanding voltage regulation and power conditioning features, occupy a major role in electrical networks, such as in power generation plants and power distribution centers. With the increasing demand, there have come up innumerous transformer manufacturers offering different types and kinds of power transformers in India that provide efficient outcomes. And, out of the list of manufacturers and transformer types, it is essential that you know what to buy and from where.

Before purchasing power transformers,

The standard

The transformer should be built as per the standards of the IEC, the International Electrotechnical Commission, an international standards organization that prepares and published international standards for all electrical, electronic, and related technologies, including power generation, transmission, and distribution. The standards include the design, the construction, and the function of the transformer, which should be such as to avoid any kind of losses.


The transformer’s capacity should be higher to assure a buffer and minimize the overload risk.

The voltage levels

The primary and secondary voltage levels of the power transformer need to be designed as step-up or step-down, based on your application. The ratios of H.V and L.V sides need to be understood, as these are what significantly determine the price of the transformer.

Load mega volt ampere

It is also important to understand the size, capacity, and nature of the load or equipment to which the transformer is required to supply sufficient voltage levels. Considering the total MVA of all the loads is important to decide on the kind of transformer you’ll need to purchase.


Higher impedance percentage may mean more current faults in the functioning of the transformer, which is why it is important to check the impedance levels of the transformer before purchase.

Current density

The primary and secondary windings of a transformer should have the same current density, which indicates the current flowing through per unit time in a unit cross-sectional area.

Vector group

The vector group, comprising of the winding configurations and the phase angle difference between the windings, should be suitable with the power network connections, to avoid any disturbances in the currents.

The protection

The transformer is liable to get damaged by sudden voltage spikes, moisture, sparks, and other malfunctions, which can be prevented by installing explosion vents, alarm trip contacts, circuit breakers, silica gels, Bucholz relays, and more.

Location of installation

Where will the transformer be installed, is also of great importance. Will it be installed indoors or outdoors? What will be the space available? What kind of environment will the transformer have to live in? The temperature, moisture, pollution, and space, all play a very important role in determining the kind of transformer you should buy.

Along with considering all the above aspects, you also need to reflect upon the transformer manufacturer you wish to partner with. The manufacturer should be experienced and professional, having worked on the kind of transformer you are looking for, ensuring quality, efficiency, and reliability, and strict adherence to national and international standard regulations. Miracle Electronics is one such manufacturer who offers only the best quality RoHS and REACH compliant power transformers in India, whether you wish on purchasing off-the-shelf transformers, or have customized transformers built for your application.

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