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Nowadays all equipment running in home or in industry or in office or any place you can imagine needs electricity. Only electricity is not enough to run any equipment. Electricity with proper voltage, required current and in required form is given to any equipment, then only equipment can run. As all know alternate current can be transferred to desirable place with proper voltage and can be changed in required form to operate it. But when equipment is made to run on frequently changing voltage, then equipment can get damaged or may catch fire which can do a huge loss to a person. To avoid it, consumers have to use a small stabilizer in homes but for each equipment one stabilizer is required which can be a tough call for being pocket friendly. Also, industries too have the same concept for their equipment in their industry. Industries get their supply in 3-phase form. Nowadays all the world is shifting towards the use of electricity rather than use of fossil fuels. For different voltages to supply authors would require different transformer. So, to avoid it a country specifies a standard for a country. In India 220V, 50Hz is specified. But still we require different voltages for use in some industries as equipment made in another country or with different standards are made and cannot work in another country. So, to break this barrier we are making phase changing and on-load tap changing transformer.