By detecting the voltage and current of low-voltage side of transformer to judge present load condition, the on-load capacity and voltage regulation transformer shall complete automatic change of transformer capacity and output voltage so as to reduce the power consumption of the transformer under the small load operation condition. This product is featured with automatic voltage and capacity adjustment, remote communication, remote measurement, remote control and remote adjustment. According to the actual load condition, in seasonal and periodical load down times, the transformer will be automatically adjusted to small capacity condition. Data in power distribution platform shall be analyzed in real time so as to realize intelligence of distribution network. This product is featured with low no-load loss, low noise and low no-load current etc.