Transformer DC resistance is a must-test item in transformer manufacturing for semi-finished products, finished products factory test, installation, overhaul, after changing the tap changer, handover test and preventive test of the power department. You can check the welding quality of the winding joints and whether the windings have short-circuits between turns. You can check whether the contact of each position of the voltage tap switch is good, whether the actual position of the tap changer matches the indicated position, whether the lead wire is broken, and multiple strands of wire are wound together. Whether there is stock breakage, etc. The instrument adopts a brand-new power supply technology, which has the characteristics of small size, light weight, large output current, good repeatability, strong anti-interference ability, and perfect protection functions. The whole machine is controlled by a high-speed single-chip microcomputer, with a high degree of automation, with automatic discharge and discharge alarm functions. The instrument has high test accuracy and simple operation, which can realize the rapid measurement of transformer direct resistance.
Technical index
Output current: 2.5A, 5A, 10A, 20A, 50A
1. Range: 40μΩ～400mΩ (50A range)
100μΩ～1Ω (20A gear)
500μΩ～2Ω (10A gear)
1mΩ～4Ω (5A gear)
2mΩ～8Ω (2.5A gear)
2. Accuracy: 0.2%
3. Resolution: 0.1μΩ
4. Working temperature: -10～40℃
5. Ambient humidity: ≤80%RH, no condensation
6. Power supply: AC220V±10%, 50HZ±1HZ
Performance characteristics
1. High degree of automation and easy operation.
2. Using high-frequency switching power supply technology, the output current is large, suitable for DC resistance measurement of large and medium-sized transformers.
3. The protection function is perfect, which can reliably protect the impact of the back EMF to the instrument, and the performance is more reliable.
4. With audible discharge alarm, clear discharge instructions, reducing misoperation.
5. The response speed is fast, and the on-load tap-changer can be directly switched in the measurement state, and the instrument automatically refreshes the data.
6. The vertical chassis structure is adopted, which is convenient for on-site use.
7. Intelligent power management technology, the instrument always works in the minimum power state, effectively reducing the internal heating of the instrument and saving energy.
8. Dot matrix LCD, Chinese menu.
9. Thermal printer, high speed, silent, print out test results.
Mobile version
15388193573
