1. Overview

In the production process of semi-finished and finished power transformers, before the newly installed transformers are put into operation and according to the preventive test procedures of the Ministry of Electric Power, the operating transformers are required to be tested regularly for turns ratio or voltage ratio. The traditional ratio bridge is cumbersome to operate, the reading is not intuitive, and the necessary conversion is required, and the test result is only one phase transformation ratio. The fully automatic variable ratio group tester overcomes the shortcomings of traditional variable ratio bridge testing. The instrument completes the three-phase transformation ratio test at one time, with fast test speed and high accuracy.

Second, performance characteristics

1. Sampling digital three-phase inverter test power supply, no harmonic content, voltage is easy to adjust, start, stop to eliminate the power supply influence of AC220V or sampling generator when supplying.

2. Three-phase test power supply, improve the test speed, and identify the transformer wiring group 0-11

3. It is suitable for a wide range of transformers, and has the function of Z-shaped connection transformer test.

4. After entering the rated parameters once, it can automatically measure the transformer ratio value, error value and automatically identify the tap changer tap position, and for the tap changer with asymmetrical tap changer, it can also accurately measure the accurate position of the transformer tap switcher, and the tap changer with up to 197 tap points can be measured.

5. The protection function is perfect, with high and low voltage reverse connection protection, transformer inter-turn short-circuit protection, output short-circuit protection, and increase the stability of the instrument.

6. Seven-inch 65K color touch screen LCD, imitation mobile phone LCD display, simple and fast operation.

7. The instrument has a non-power-down clock and data storage, which is convenient for viewing historical data.

8. The instrument has both printout, U disk interface, and RS232 interface, which is convenient for paperless office

9. It adopts cold-resistant, temperature-resistant, sealed and waterproof, drop-proof and shockproof multi-functional engineering plastic box, which is convenient for field testing.

3. Technical indicators

1. Range: 0.9~10000

2. Accuracy: ± (0.1%+2 words) (below 500)

± (0.2%+2 words)(500~2000)

± (0.3%+2 words) (2000 or more)

3. Resolution: minimum 0.0001

4. Output voltage: 2V, 7V, 100V, 170V

5. Power supply: AC220V ±10% 50HZ

6. Operating temperature: –20°C~ 40°C Wuhan Jinyuan Electric Co., Ltd

7. Relative humidity: ≤85%, no condensation

8. dimensions; Main machine: 360*290*170(mm) Wire box: 360*290*170(mm)

9. Weight: main engine 5.9KG wire box: 5.1KG