The coherent transformer is indoors installment, the air self-cooling or the forced-air cooling type. All transformers output voltage and the input voltage wilfully manufacture. Is suitable to the illumination, the engine bed electric appilance, the mechanical electronic installation, the electronic instrumentation equipment, the rectifier unit electric power supply and so on the safe fire protection requests a higher place. Makes the tranformation voltage, for illumination electric appliance facility, using of power power source, the rectification power source.