Autotransformer refers to a transformer whose windings are primary and secondary on the same winding, with the primary and secondary windings directly connected in series and self coupled. According to the structure, it can be further divided into adjustable pressure type and fixed type. Autocoupling refers to electromagnetic coupling. Ordinary transformers transmit energy through electromagnetic coupling of the primary and secondary coils. There is no direct electrical connection between the primary and secondary sides, while the primary and secondary sides of an autotransformer have direct electrical connections. Its low-voltage coil is a part of the high-voltage coil. Protective equipment such as autotransformers are also used in communication lines
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