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, it is required to conduct turn to turn ratio or voltage ratio tests on the running transformers. This can check the correctness of the transformer turn to turn ratio, the condition of the tap changer, whether the transformers have inter turn short circuits, and whether the transformers can operate in parallel. The traditional variable ratio bridge reading is not intuitive and requires conversion, which can only be measured phase by phase. The transformer ratio tester overcomes the shortcomings of traditional transformer ratio bridge testing, and its operation is simple and intuitive. It uses a three-phase precision inverter power supply, which is fast in testing and high in accuracy.

II.Functional features

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

2. By using three-phase output voltage to improve testing speed, the angle between phases can be measured, and the wiring group 0-11 can be automatically identified. For low voltage rectifier transformers with multiple windings, the low voltage side does not need to be disconnected, and the transformation ratio and angle deviation of 7.5 ° can be measured (Phase angle measurement for buyer’s option).

3. Suitable for a wide range of transformer types, Z-type transformers, the device with angle measurement (for buyer’s option) can also measure rectifier transformers, grounding transformers, electric furnace transformers, phase-shifting transformers, and other transformers (Model no.TRT-VII can also measure Scott transformer & inverse Scott transformer).

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

5. After inputting 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 a maximum of 99 tap changer positions.

6. 7-inch high brightness touch color LCD, clear display under strong light, full touch screen operation.

7. The instrument can be equipped with print output, USB flash drive interface, and RS232 interface, making it convenient for paperless office work.

8. Adopting a multifunctional engineering plastic box that is cold and temperature resistant, sealed and waterproof, anti drop and shockproof, making it easy 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 parameters

IV.Panel

1. Display screen: 7-inch high-definition color touch screen LCD, digitally adjusted backlight, displaying operation menu and test results.

2. High voltage terminal: Connect the test wire yellow, green, red, and black terminals, corresponding to the A, B, C, and O three-phase on the high voltage side of the transformer being tested.

3. Low voltage terminal: yellow, green, red, and black correspond to three-phase A, B, C, and O on the low voltage side of the tested transformer

4. AC220V: The power input port of the entire machine is

connected to the AC220V power supply.

5. Earth: Protective grounding column.

6. Communication: serial communication

7. USB: USB storage

8. Printer: Print the test results after the measurement is completed.

V.Accessories