Power transformers are used in high voltage transmission networks i.e. 400 KV, 200 KV, 110 KV, 66 KV, 33 KV. Since power can’t be transferred at high voltage to the customers, so the power is stepped down using step-down power transformer.
They are mainly rated above 200 MVA. These transformers have appx. 100% efficiency and mainly installed at generating station and transmission substations. They are relatively bigger in size as compared to distribution transformers.
Recent increase in the use of renewable energy such as solar, wind etc. have increased the demand of distribution transformer. This will be the key driver for the European transformer market.
Market segmentation for US power transformer is done on the basis of rating of transformers (small, medium, large), cooling used in the transformer (air-cooled, oil-cooled) and by geography.
Power transformers whose rating is less than 60 MVA falls under this category.
Power transformers with rating between 61 MVA TO 600 MVA falls under medium category.
Power transformers with rating above 600 MVA falls under large power transformer category.
*Here VA stands for Volt Ampere, which represents power.
In this type of transformers, winding sand core are immersed in oil, in a tank with radiators. Here oil act as both insulator and cooling agent. Common application of these type of transformer are-
Oil filled sealed transformers are used in distribution networks (MV/LV) and in installation up to 52 kV having power rating up to 2.5 MVA. Few manufacturers have built this kind of transformers for power rating up to 30 MVA.
These falls under the category of dry type transformers, where air is used as a cooling agent instead of oil. This type of transformers is most suitable where distribution of energy requires absolute safety. These requires less maintenance and are safer as compared to oil type transformers. Possess very less space and are simple in design with onsite replacement of winding s feasibility.
Dry type transformers are used in-
Air cooled transformer is in great demand due to its low fire hazard probability as compared to oil cooled transformers.
Due to constant increase in energy demand and ambitious reduction of greenhouse gases, US is witnessing a large installation of power plants with renewable energy sources. This will require a large number of distribution and power transformer for the transmission of electricity.
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