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
1. Output current: automatic, 10A, 5A, 1A, 200mA, 40mA, <5mA
2. Resolution: 0.1μΩ
3. Range: 100Ω-50KΩ (<5mA gear)
500mΩ-250Ω (40mA gear)
100mΩ-50Ω (200mA gear)
5mΩ-10Ω (1A range)
1mΩ-2Ω (5A range)
0.5mΩ-800mΩ (10A range)
0.5mΩ-50KΩ (automatic gear)
4. Accuracy: 0.2%
5. Working temperature: -10~40℃
6. Working humidity: <80%RH, no condensation
Features
1. The whole machine is controlled by a high-speed single-chip microcomputer, with a high degree of automation and easy operation.
2. Adopt brand-new power supply technology, multiple current gears, wide measurement range, and can automatically select the test current according to the load.
3. 320*240 dot matrix 65K true color LCD touch screen, clear display under strong light, dual use of touch screen/keys.
4. RS232 and USB interface, can communicate with computer and U disk storage.
5. The protection function is perfect, which can reliably protect the impact of the back EMF to the instrument, and the performance is more reliable.
6. With discharge sound alarm and screen prompts, the discharge instructions are clear, reducing misoperations
7. Fast response speed, stable measurement data, and automatic data refresh during the test.
8. Intelligent power management technology can effectively reduce the internal heating of the instrument and save energy.
9. The non-power-off clock and non-power-off memory can store data permanently.