The DC resistance of transformers is a necessary measurement item for semi-finished and finished products in transformer manufacturing, factory testing, installation, major repairs, changes to tap changers, handover testing, and preventive testing by power departments. It is possible to check the welding quality of the winding joints and whether there is a turn to turn short circuit in the winding. It can also detect whether the various positions of the voltage tap changer are in good contact, whether the actual position of the tap changer matches the indicated position, whether the lead wire is broken, and whether there are broken wires when multiple wires are wound together. In order to meet the needs of rapid measurement of transformer DC resistance, Shanghai Donghai Company has developed a 100A DC resistance tester.YHZ-100A Transformer DC Resistance TesterAdopting new power technology, it has the characteristics of small size, light weight, high output current, good repeatability, strong anti-interference ability, and complete protection function. The whole machine is controlled by a high-speed microcontroller, with a high degree of automation and automatic discharge and discharge alarm functions. The instrument has high testing accuracy, easy operation, and can achieve rapid measurement of transformer direct resistance.

1. The whole machine is controlled by a high-speed microcontroller, with a high degree of automation and easy operation.

2. Adopting high-frequency switching power supply technology, the output current is large, suitable for measuring the DC resistance of large and medium-sized transformers.

3. The protection function is complete, which can reliably protect the impact of back electromotive force on the instrument, and the performance is more reliable.

4. It has an audible discharge alarm, clear discharge indication, and reduces misoperation.

5. Fast response speed, can directly switch to on load tap changer in measurement state, and the instrument automatically refreshes data.

6. Adopting a vertical chassis structure for easy on-site use.

7. Intelligent power management technology ensures that instruments always operate at their minimum power, effectively reducing internal heat generation and saving energy. Can work continuously for several hours without interruption.

8. Dot matrix LCD, Chinese menu, printed output.

1. Output current: 10A, 20A, 40A, 100A

2. Range: 10 μ Ω～ 100m Ω (100A)

100μΩ～500mΩ （40A）

200μΩ～1Ω （20A）

500μΩ～2Ω （10A）

3. Accuracy: 0.2%

4. Resolution: 0.1 μ Ω

5. Working temperature: 0-40 ℃

6. Environmental humidity: ≤ 90% RH, no condensation

7. Working power supply: AC220V ± 10%, 50HZ ± 1HZ

8. Net weight: 17KG

9. Dimensions: 400mm * 230mm * 380mm