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 issues, loose connections, missing strands, broken wires in transformer coils, and potential hidden dangers after operation. This instrument adopts brand-new power supply technology and features small size, light weight, and large output current. The entire 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 testing accuracy and is easy to operate, enabling rapid measurement of transformer DC resistance. It adopts a dual power supply structure. For transformers with tap windings connected in YN, it can apply power to three phases simultaneously. 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 with real-time acquisition, simultaneously measuring three resistance values and calculating the three-phase resistance unbalance.
3、It can measure three phases simultaneously or use the traditional single-channel measurement, and also has a temperature conversion function for convenience.
4、It has a comprehensive protection circuit and high reliability.
