The DC resistance test of transformer windings is a test item for transformers after handover, major repairs, and changes to tap changers. By measuring the DC resistance of the transformer winding, the welding or connection quality of the leads, the presence of inter turn short circuits or open circuits in the winding, and the good contact of the tap changer can be checked.
DC resistance rapid testerMain functions and features:
1. Using a high-speed 16 bit A/D converter, the measurement data is stable and has good repeatability.
2. Built in rechargeable battery and fast charging circuit, with charging indicator and overcharge protection function.
3. Automatic programmable current source technology allows for manual selection of typical output current values or automatic control of output current by an internal microcontroller. The current source has a total of 3000 current levels, and in automatic mode, the internal microcontroller automatically controls the measured resistance to achieve a wide measurement range and * measurement state.
4. Real time dynamic display, fast response speed, can directly switch the tap changer in the measurement state, the instrument will automatically prompt, and the new resistance value will be displayed quickly without restarting.
5. Highly intelligent design with clever and innovative functional settings, capable of automatically detecting faults such as virtual or disconnected test lines.
6. The protection function is complete and can reliably protect against the impact of back electromotive force on the instrument, with automatic discharge indication function.
7. It can display the measured current and measurement time.
8. Can store 250 measurement data without loss in case of power failure.
9. All Chinese character menus and operation prompts are intuitive and convenient.
Notes:
During the DC testing process, if the undervoltage indicator light is on, the DC power supply should be stopped and replaced with an AC power supply for testing.
After using the DC power supply for testing, the instrument should promptly charge and maintain the batteries inside the machine.
3. This instrument should be protected from moisture, falling, and direct sunlight.