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According to the analysis of power consumption time, transformers can be divided into step-up transformers, step-down transformers, distribution transformers, connection transformers and factory transformers. According to the winding form, it is divided into two-winding transformer, self-coupling transformer and three-winding transformer; From a few to a single three-phase transformer and transformer; According to rubber, transformers are divided into non-excitation regulators and transformers; It consists of cooling, self-cooling transformer, transformer coil, forced conversion circulating transformer oil and forced water cooling circulating transformer oil.