The DC resistance of a transformer is a necessary measurement project for the semi-finished product, the finished product factory test, the installation, the handover test, and the preventive test of the power sector in the transformer manufacturing. Can effectively find Transformer coil material selection, welding, loose connection, stock loss, breakwire and other manufacturing defects and hidden dangers after operation. In order to meet the needs of DC resistance rapid measurement of Transformers, we have developed HYG series DC resistance tester based on the advantages of our own technology. The instrument adopts a new power supply technology, which has the characteristics of small size, light weight and large output current. The whole machine is controlled by a single chip microcomputer and automatically completes the functions of self-inspection, data processing, and display. It has automatic discharge and discharge indication functions. The instrument has high precision and simple operation, and can realize the fast measurement of transformer direct resistance.
The HYG-3L DC Resistance Test Instrument(20T) uses a dual power supply structure to windings the connected Transformer YN connection to achieve simultaneous three-phase charging. The measurement system adopts independent three-channel current sampling and independent three-channel voltage sampling. At the same time, the three-phase resistance value and three-phase imbalance ratio are measured and displayed. The working time is greatly shortened, and the problem of long time for DC resistance testing of power Transformers is solved. The required time is only 1/3 of that of traditional methods.
