For the power system, transformers are core equipment, and their long-term, reliable operation is crucial to the stability and reliability of the entire system. The DC resistance of transformers is a mandatory test item for semi-finished products and finished products during factory tests, installation, handover tests, and preventive tests by power departments. It can effectively detect manufacturing defects such as material selection, welding, loose connections, missing strands, and broken wires in transformer coils, as well as potential hazards after operation. To meet the need for rapid measurement of transformer DC resistance, our company has developed a transformer DC resistance tester using its own technological advantages. This instrument integrates assisted magnetization method testing, three-phase testing (Yn, Y, △), and demagnetization functions, making it an ideal device for measuring large power transformer DC resistance. It features a true color high-resolution LCD display with touch control and a rotary knob for easy on-site use. It also includes a Chinese menu prompt function, offering simple and intuitive operation. All DC resistance tests can be completed with a single wiring setup, featuring fast testing speed, high accuracy, and wide measurement range.

For Yn, Y, and △ type windings, a three-phase measurement method can be used for testing, and the three-phase imbalance rate can be calculated.

The test power supply has a maximum output current of 50A, with a testing range of 0～25kΩ, meeting the testing needs of most transformers.

Additionally, it integrates assisted magnetization and demagnetization functions to meet various on-site testing requirements.

During the testing process, it automatically calculates the resistance change rate within 5S, 15S, and 30S, assisting test personnel in assessing data stability and preventing misinterpretation of data.

The instrument features multiple protection functions including 380V misconnection protection, reverse EMF protection, open circuit protection, and power failure protection, as well as an alarm function for unconnected grounding wires.

Equipped with a thermal printer, the device can store 200 test records locally and supports massive storage via USB flash drives.

It features a 7-inch industrial-grade true color display with a clear and minimalist design, offering full touch control plus a rotary knob for one-key operation, creating a comfortable and convenient human-machine interaction experience.