Power Transformer Specifications and Standards

Published: 12th September 2011
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A power transformer may be best defined as an electrical device aimed at transferring alternating current or voltage from one electric circuit to another through electromagnetic induction. Power transformers can have features for electrical isolation, power distribution, and control and instrumentation applications. Power transformers can be configured as either a single-phase primary configuration or a three-phase configuration.



The operating principle of power transformers is quite simple. The transformer basically consists of a number of coils of insulated wire wound on a laminated steel core. When voltage is introduced to one coil, known as the primary, it magnetizes the iron core. A voltage is then induced in the other coil, known as the secondary or output coil. The change of voltage between the primary and secondary coils depends on the turn ratio of the two coils.



Transformers are not restricted to one output coil. In fact, they can provide complete range of voltage sources from the one input coil by using separate windings on the secondary side. This makes transformers very versatile for supplying complete systems with all of their voltage requirements from one source.



Power transformers are the most common class of transformers and they have been built for a power of 1300 megavolt-amperes and a voltage of 750 kilovolts. Specifying a power transformer entails lot of research, hard-work, and knowledge. In reality though, you need to come up with a specification that would best suit your needs.



Power Transformers are designed and manufactured to meet specific customer requirements and specifications along with the applicable standards. The important specifications to consider when searching for power transformers include maximum secondary voltage rating, maximum secondary current rating, maximum power rating, and output type. A transformer may provide more than one secondary voltage value. The Rated Power of the transformer is the sum of the VA (Volts x Amps) for all of the secondary windings.



The function of power transformers is to convert one voltage to another at high power level. Power transformers are used in electronic circuits and come in many different types and applications. Power transformers are sometimes considered to be those with ratings of 300 volt-amperes and below. These transformers normally provide power to the power supply of an electronic device, such as in power amplifiers in audio receivers.

Power transformers can be designed either as a toroidal transformer or as a laminated transformer. Toroidal transformers have copper wire wrapped around a cylindrical core so the magnetic flux, which occurs within the coil, doesn't leak out. Besides, the coil efficiency is perfect and the magnetic flux has little influence on other components. Laminated transformers, on the other hand contain laminated-steel cores and they are known as E-I transformers. These steel laminations are insulated with a non-conducting material like varnish, and then formed into a core that reduces electrical losses.



Power transformers can be one of several different types. These include autotransformer, control transformer, current transformer, distribution transformer, general-purpose transformer, instrument transformer, isolation transformer, potential (voltage) transformer, power transformer, step-up transformer, and step-down transformer. Again, there are different types of mountings for power transformers that include chassis mount, dish or disk mount, enclosure or free standing, h frame, and PCB mount.



Sanju is an Expert author for electrical transformer and high transformer voltage. He has written many articles like flyback transformer and custom power transformer. For more information visit: high voltage transformer


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