I. Overview

In the production process of semi-finished and finished products of power transformers, before the newly installed transformers are put into operation and in accordance with the preventive testing regulations of the Ministry of Electric Power of China, it is required to conduct turn ratio or voltage ratio tests on the operating transformers. This can check the correctness of the turn ratio of the transformer, the condition of the tap changer, whether the transformer has inter turn short circuits, and whether the transformer can operate in parallel. The traditional ratio bridge reading is not intuitive and requires conversion, which can only be measured phase by phase. The XXA 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.

II. Functional Characteristics

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 power source is the generator, there is no impact.

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

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

4. Equipped with high and low voltage reverse connection protection, transformer turn to turn short circuit protection, tap changer off/off protection, output full short circuit protection, and increased instrument stability.

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

6. 7-inch high brightness touch color LCD, clear display under strong light, full touch screen operation, free switching between Chinese and English

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

8. Adopting a multifunctional engineering plastic box that is cold and temperature resistant, sealed and waterproof, and resistant to falls and shocks, it is convenient for field testing.

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

III. Technical Parameter

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

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

± 0.2%+2 words (501-2000)

± 0.5%+2 words (2001-10000)

3. Angle accuracy: ± 0.2 °

4. Output voltage: automatically adjusted according to load

5. Resolution: Ratio - minimum 0.0001, angle -0.01 °

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

7. Environmental temperature: -10 ℃~40 ℃

8. Relative humidity: ≤ 85%, no condensation

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

10. Weight: 5KG for the main unit, Box: 5.6KG

11. Test line length: standard 13 meters length can be customized