high-power industrial rectifying device,special power supply equipment, high-voltage frequency conversion device,power supply for testing of frequency-conversion motor,rectifying and muting power supply of underground train, high-low voltage power compensation and filter device, hydraulic generating set and its auxiliary equipments,micro-computer automatic system of generating (transforming and distributing) station,power transformer,special transformer,dry-type transformer,pre-installed transformer substation,pre-installed transformer and the complete set of devices of high-low voltage switches, line motor,levitated electromagnet,and railroadelectric machinery series.