Instrument Overview
DC resistance is a very important test item. In the "Regulations for Power Equipment Testing," it ranks second among transformer test items. The regulations stipulate that during transformer handover, major repair, minor repair, tap changer position changes, fault inspection, and preventive testing, the DC resistance of transformer windings must be measured. The purposes are:
① To check the welding quality of internal conductors and leads in the winding
② To check whether the contacts at each position of the tap changer are in good condition
③ To check whether there are any broken points in the winding or leads
④ To check the correctness of parallel branches, and whether there is a situation where one or more breaks occur in a winding made of several parallel conductors
⑤ To check for short circuits between layers and turns
This product complies with the requirements of the national standards GB6587-86 "General Outline for Environmental Testing of Electronic Measuring Instruments" and GB6593-86 "Quality Inspection Rules for Electronic Instruments."
Main Features of the Instrument
1. Uses a high-speed 16-bit A/D converter, providing stable measurement data and good repeatability.
2. Adopts automatic program-controlled current source technology, with a total of 1000 current gears set in the current source, automatically controlled by the internal microcontroller according to the measured resistance, thereby achieving a relatively wide measurement range and measurement states without manual current gear switching.
3. Fast response speed. The tap changer can be directly switched during measurement, and the instrument will automatically prompt, with the new resistance value displayed quickly.
4. Highly intelligent design with ingenious and advanced function settings, capable of automatically detecting faults such as loose test lead connections or broken wires.
5. Comprehensive protection functions, reliably protecting the instrument from back electromotive force impacts, with automatic discharge indication.
6. Can display measurement current and measurement time.
7. Intelligent power management technology effectively reduces internal heat generation of the instrument.
8. Can store 120 measurement data records, which are not lost upon power failure.
9. All Chinese menu and operation prompts are intuitive and convenient. 10. The digital resistance measuring instrument features high measurement accuracy, stable performance, clear display, wide measurement range, and strong anti-interference capability.
