Autotransformers are special power transformers in India that have only one isolated winding to step up or step down the voltage. The word “auto” here does not depict any automatic process; rather it indicates the action of the single coil that acts alone. These transformers are a great choice to be used in applications that require low voltage.
In power applications – Autotransformers are used in power applications to interconnect systems operating at different voltage classes like 132 kV to 66 kV for transmission. In long rural power distribution lines, special autotransformers with automatic tap-changing equipment are inserted as voltage regulators to receive the same average voltage at the end of the line.
In audio systems – Tapped autotransformers are used in audio applications to adapt speakers to constant-voltage audio distribution systems, and for impedance matching.
In railway applications – Autotransformers are used in railways to link the contact wire to the rail and to the second supply conductor to increase usable transmission distance, and reduce induced interference into external equipment.
Some of the uses of an autotransformer are mentioned below.
To test an electronic device after repairs – After repairing, an electronic device needs to power up to ensure that the replaced parts do not burn. If high voltage is supplied without testing, the parts burn out. But, using an autotransformer to slowly power up the repaired device prevents such damage. You can also power up an old amplifier or radio with the help of an autotransformer. The electrolytic capacitors need to be reconditioned by applying reduced voltage through such a transformer.
To adjust AC supply voltage – An autotransformer can easily adjust AC power supply’s output voltage. By changing the AC voltage that is being applied to AC motors, speed can be controlled. This is where autotransformers can help by changing the AC voltage and controlling the speed of motors that drive fans. An autotransformer can also alter the AC voltage within a resistance-type heater, thus adjusting its temperature. Styrofoams and other foams are cut into shape by a hot wire cutting system. An autotransformer can also control the hot wire’s temperature and adjust it to meet the desired requirements.
To compensate for line voltage drop – Long power line suffer from voltage drop in applications that draw high current. Autotransformers can be used to compensate for this loss of voltage.
To construct unregulated DC power supply of high current – An unregulated DC power supply of high current can be constructed with the help of an autotransformer. However, this should be done only if you are aware of the safety concerns associated with an autotransformer. Autotransformers are connected with AC power, making AC voltage directly accessible, thus increasing the risk of electric shock.
For the best autotransformers, or any kind of power transformers in India for that matter, you can get in touch with Miracle Electronics. Here you can get the best quality transformers of all types like toroidal, power, medical isolation, audio output, EI, SMPS, UI, and many others.