Product Introduction
The DC resistance of a transformer is a test item for semi-finished and finished products in transformer manufacturing, and it is also a mandatory test item for transformer installation, major overhauls, changing tap connections, handover tests, and preventive tests. This instrument can check the following situations: the welding quality of the winding joints, whether there is an inter-turn short circuit in the winding, whether the contact at each position of the voltage tap changer is good, whether the actual position of the tap changer is consistent with the indicated position, whether the lead-out wires are broken, and whether there are broken strands in multi-strand wires wound together, etc.
 
This instrument adopts new power supply technology and features small size, light weight, large output current, good repeatability, strong anti-interference ability and complete protection functions. The whole machine is controlled by a high-speed single-chip microcomputer, with a high degree of automation and features automatic discharge and discharge alarm functions. This instrument features high testing accuracy and simple operation, enabling rapid measurement of the DC resistance of transformers.

Performance characteristics
1) Full Chinese menu, simple and friendly interface.
2) It features a high degree of automation and simple operation.
3) It adopts new power supply technology, featuring large output current and wide measurement range.
4) It is applicable to the measurement of DC resistance of various types of current transformers or large and medium-sized transformers of 35KV and above.
5) It has a complete protection function, which can reliably protect the instrument from the impact of counter electromotive force, making its performance more reliable.
6) It is equipped with a discharge sound alarm and clear discharge indication to reduce misoperation.
7) Intelligent power management technology effectively reduces the internal heat generation of the instrument and saves energy.
8) Micro thermal printer, high speed, silent, and can print test results at any time.
9) Vertical chassis structure, convenient for on-site use.

Technical indicators
Current range and range
20A 100μΩ to 1Ω
10A 500μΩ to 2Ω
5A 1mΩ to 4Ω
2.5A 2mΩ to 8Ω
1A 5mΩ to 20Ω
 
Accuracy ± (0.2%±2 digits)
Resolution: 0.1μΩ
Ambient temperature: -10℃ to 40℃
Relative humidity ≤80%RH, no condensation
Working power supply: AC220V±10%, 50Hz