Features and Advantages
Transformation ratio functional characteristics
The instrument integrates three-phase or single-phase standard power supply with stable amplitude and constant phase.
The transformation ratio test function is not only suitable for general power transformers, but also especially suitable for Scott, inverse Scott and balance transformers of Z-winding transformers, rectifier transformers and railway electrical systems.
The instrument adopts 16 bit high-precision AD converter with CPU and DSP (digital signal processing) chip, which effectively ensures the measurement accuracy and anti-interference ability.
The measurement speed is fast and the test efficiency is high. The transformation ratio, high-voltage resistance three-phase resistance and low-voltage three-phase resistance can be tested by one-time cable connection. In the process of multi tap transformer test, only one parameter needs to be set, and the tap can be judged automatically without modifying the tap during repeated test, which greatly improves the work efficiency.
The instrument automatically switches the range according to the tested object.
It has the functions of over current protection and wiring inspection.Large screen, high brightness LCD display, all English menu and operation tips realize friendly man-machine dialogue, and touch the keys to make the operation easier.
It is equipped with a real-time electronic clock to automatically record the date and time of the test, which is conducive to the storage and management of the test results.
The data has the functions of power down storage and browsing, can store 1000 groups of experimental results, and can transmit data online with the computer.
Functional characteristics of DC resistance
One time cable connection can automatically complete the three-phase test, and you can choose to test phase resistance and line resistance, automatically calculate the three-phase unevenness after the test, and automatically correct it to the target temperature according to the set temperature.
The instrument provides 7-gear output current selection, and the maximum output current is 10A.
The measuring range of the instrument is wide, 0-20k Ω.
It has perfect protection circuit and more reliable performance.
With audio and LCD indication the discharge alarm, the clear discharge indicators to reduce misoperation.
Parameter
- Environment Condition
- Transformation ratio measurement range and accuracy
- Range and accuracy of DC Resistance test
- Insulation strength
| Environment Condition | |
| Temperature | – 5C ~ 40C |
| Relative humidity | < 95% (25C) |
| Altitude | < 2500m |
| External interference | no extra strong vibration and electromagnetic field |
| Power supply | 180vac ~ 250VAC, 45Hz ~ 55Hz |
| Transformation ratio measurement range and accuracy | |
| Transformation ratio test range | 0.5 ~ 10000 |
| Group test range | 1 ~ 12 |
| Angle difference test range | 0 ~ 360 ° |
| Transformation ratio measurement accuracy | ± 0.2% (1 ~ 2000) ± 0.4%(2001~4000) |
| Angle difference measurement accuracy | 30 |
| Range and accuracy of DC Resistance test | |
| Range：0-180mΩ （10A）+0.2% ±0.01mΩ 180mΩ-360mΩ （5A） +0.2% ±0.02mΩ 360mΩ-1.8Ω （1A）+0.2% ±0.05mΩ 1.8Ω-4.5Ω （400mA） +0.2% ±0.1mΩ 4.5Ω-9Ω （200mA） +0.2% ±0.2mΩ 9Ω-45Ω (40mA)+0.2% ±0.5mΩ 45Ω-20kΩ (<5mA)+0.2% ±1mΩ | |
| Accuracy | +0.2% |
| Resolution ratio | 0.1μΩ |
| Insulation strength | |
| The insulation resistance of voltage and current input terminals to the casing shall be ≥ 100m Ω | |
| The power frequency 2KV (effective value) shall be borne between the input end of the working power supply and the shell for 1 minute |
