The HVW20D is a 20A DC resistance test of a transformer and is a necessary measuring item in the testing, installation, commissioning testing and electric power department’s preventive testing of semi-finished products and finished products in transformer manufacturing.

It can be used to effectively detect the selection of transformer coils, welding, loose connection parts, missing strands, broken wires, etc.

The instrument is small in size, light weight, large output current, etc. It is optimized for measuring the three-phase winding DC resistances of large-capacity transformers.

The instrument can be used to measure the three-phase winding DC resistances of a transformer at the same time.

For an on-load tap changing transformer, there is no need for discharging and tapping is directly adjusted with the instrument; the measuring time is 1/3 of traditional single-phase measuring time, which can greatly shorten testing time.