The DC resistance of a transformer is a mandatory test item in transformer manufacturing for semi-finished products, finished product factory tests, installation, commissioning tests, and preventive tests by power departments. It can effectively detect manufacturing defects such as poor material selection, welding, loose connections, missing strands, broken wires in transformer coils, and hidden dangers after operation. This instrument adopts brand-new power supply technology and features small size, light weight, and large output current. The whole machine is controlled by a microcontroller, automatically completing self-check, data processing, display, and other functions, with automatic discharge and discharge indication functions. The instrument has high test accuracy and is easy to operate, enabling fast measurement of transformer DC resistance. It adopts a dual power supply structure. For transformers with tap windingsYN connected windings, it enables simultaneous three-phase power application. The measurement system uses independent three-channel current sampling and independent three-channel voltage sampling, measuring and displaying three-phase resistance values and three-phase unbalance rate simultaneously. This greatly shortens working time and solves the problem of long testing time for DC resistance of each tap winding of power transformers, taking only 1/3 of the time required by traditional methods..
Three-Channel DC Resistance Tester Performance Features
1.The instrument has a large output current and automatically selects the current, making operation simple.
2. Three-channel measurement, real-time acquisition, measures three resistance values simultaneously and calculates the three-phase resistance unbalance.
3、It can measure three phases simultaneously, or measure single channel in the traditional way, and also has temperature conversion function, making it convenient to use.
4、It has a complete protection circuit and high reliability.
