In the production process of semi-finished and finished power transformers, before the newly installed transformer is put into operation and according to the preventive testing regulations of the Ministry of Electric Power, it is required to conduct turns ratio or voltage ratio tests on the operating transformer. This can check the correctness of the turns ratio of the transformer, the condition of the tap changer, whether the transformer is short circuited between turns, and whether the transformer can operate in parallel. The traditional variable ratio bridge reading is not intuitive and can only be measured phase by phase for conversion. This variable ratio tester overcomes the shortcomings of traditional variable ratio bridge testing, with simple and intuitive operation. It uses a three-phase precision inverter power supply for fast testing and high accuracy.

1. The instrument adopts a three-phase precision inverter power supply internally, which eliminates the harmonic influence of the mains voltage during measurement and makes the measurement more accurate. When the working source is a generator, there is no impact.

2. By using three-phase output voltage, the testing speed can be improved, and the phase angle can be measured. The wiring group 0-11 can be automatically identified. For rectifier transformers with multiple windings for low-voltage measurement, the low-voltage side can measure the transformation ratio and angle deviation of 7.5 ° without disconnecting the wires.

3. Suitable for a wide range of transformer types, especially for measuring Z-type transformers, rectifier transformers, grounding transformers, electric furnace transformers, phase-shifting transformers, Scott transformers, inverse Scott transformers, and other transformers.

4. It has high and low voltage reverse protection, transformer turn to turn short circuit protection, tap changer failure protection, output full short circuit protection, and increases instrument stability.

5. After inputting the rated parameters, the transformer transformation ratio, error value, and tap changer tap position can be automatically measured. Especially for tap changers with asymmetric tap changers, the accurate position of the transformer tap changer can also be accurately measured, and up to 99 tap changer positions can be measured.

6. Adopting a 7-inch high-definition color touch screen LCD, modular display, and clear display even under strong light.

7. The instrument has both print output and USB interface, and can also be equipped with RS232 interface.

8. Convenient for paperless office.

9. Adopting a multifunctional engineering plastic box that is cold resistant, temperature resistant, sealed, waterproof, and shockproof, it is convenient for field testing.

10. The instrument can use an Android phone or tablet, follow the WeChat official account, download the APP, control the instrument through the whole process of software, and store and upload test data for easy reference.

1. Test range: Variable ratio value -0.9 to 10000 degrees -0 to 360 degrees

2. Ratio accuracy: ± 0.1%+2 words (0.9-500)

± 0.2%+2 characters (501-2000)

± 0.5%+2 characters (2001-10000)

3. Angle accuracy: ± 0.2 °

4. Output voltage: automatically adjusted according to the load

5. Resolution: Ratio - up to 0.0001, angle -0.01 °

6. Working power supply: AC220V ± 10% 50 ± 1Hz

7. Environmental temperature: -10 ℃ to 40 ℃

8. Relative humidity: ≤ 85%, no condensation

9. External dimensions; Host: 360 * 290 * 170 (mm) 

Wiring box: 360 * 290 * 170 (mm)

10. Weight: 5KG host, cable box: 5.5KG

11. Test line length: Standard 13 meter length can be customized