Three-phase isolation transformer is a safe nature of power, the power we used for maintenance, safe use, we use security service like color TV, air conditioning. Isolation transformer is divided into two, one high and low voltage isolation transformer, one is 1: 1 isolation transformer. High voltage isolation transformer for secondary protection circuit and measuring circuit and separated by high-voltage transformer, to avoid personal risk and pressure instrumentation designed for burning, also known as transformers. But generally refers to the 1: 1 transformer, and not due to the secondary connected to ground. Either there is no potential difference between the secondary one wire and ground. Commonly known as safety transformer isolation transformer, it is generally used to isolate the city grid electricity and maintenance of equipment and other impurities purposes. The three-phase isolation transformer is usually we see a three-phase voltage, dry-type, is a dry-type transformer itself is self-cooling properties, three-phase transformer particularly widespread use as: CNC computer gongs SMT equipment PCB drilling machine laser cutting machine punching machine CNC lathe machine printing machine automatic plug-exempt auto assembly line laser cutting machine plastic injection molding machines laboratory equipment electronic equipment whole plant transformer rectifier unit and so on. . . .