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 transformer ratio tester overcomes the shortcomings of traditional ratio bridge testing, is easy to operate and intuitive, uses a three-phase precision inverter power supply, and has fast testing and high accuracy.

1. The instrument uses a three-phase precision inverter power supply instead of a single-phase mains power supply for measuring voltage, eliminating the harmonic effects of mains voltage during measurement and achieving more accurate measurements. When the working power source is a generator, there is no impact. By using three-phase output voltage to improve testing speed, it is possible to measure the phase to phase angle and automatically identify transformer wiring groups 0-11.  

2. Suitable for a wide range of transformer types, especially for measuring transformers such as Z-type transformers, rectifier transformers, grounding transformers, electric furnace transformers, phase-shifting transformers, etc.

3. Adopting a self-made precision three-phase inverter power supply, it has high and low voltage reverse connection protection, transformer turn to turn short circuit protection, tap changer failure protection, output full short circuit protection, and increases instrument stability.

4. 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 99 tap changer positions can be measured.

5. Adopting a 7-inch high-definition color touch screen LCD, modular display, each operation step has Chinese prompts, no manual is required, only the LCD prompts can complete the instrument operation.

6. The instrument can be connected to an external printer to print measurement data, making it convenient for paperless office work.

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

1. Test range: 0.9 to 10000

2. Measurement 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: as small as 0.0001 ° -0.01 °

6. Working power supply: battery powered

7. Environmental temperature: -10 ℃ to 40 ℃

8. Relative humidity: ≤ 85%, no condensation

9. Test line length: 13 meters

10. Dimensions: Host 252 * 160 * 65 (mm)

Outer box: 425 * 335 * 210 (mm)

11. Weight: Host 2KG Outer box: 8KG