In the production process of semi-finished and finished power transformers, before the newly installed transformers are put into operation, and during the operation of transformers in the power system, according to the preventive testing regulations of the Ministry of Electric Power, it is required to regularly conduct turns ratio or voltage ratio tests on the operating transformers. The traditional variable ratio bridge is cumbersome to operate, the readings are not intuitive, and necessary conversions need to be made. The test results are only the value of one phase ratio, and the three-phase variable ratio values need to be measured phase by phase. The device overcomes the shortcomings of traditional variable ratio bridge testing. The instrument adopts a one-time completion of three-phase transformation ratio testing, with fast testing speed and high accuracy. Greatly saving on-site testing time and bringing high efficiency to customers' experiments. Suitable for a wide range of transformer types, it can test various connection groups of transformers such as Y/y, Y/d, D/y, D/d, YN/zn, ZN/yn, and can also measure the transformation ratio of voltage transformers (PT) and current transformers (CT).

FEATURES

1. The testing range is wide (0.9~20000), and can be used for single-phase and three-phase measurements. The three-phase test can complete the measurement of the tap position, tap value, transformation ratio, turn ratio, phase angle, error and other parameters of the ABC three phases in one go. It can automatically measure the connection group number;

2. Suitable for a wide range of transformer types, it can test various connection groups of transformers such as Y/y, Y/d, D/y, D/d, YN/zn, ZN/yn, and can also measure the transformation ratio of voltage transformers (PT) and current transformers (CT);

3. The test results show a hexagonal vector diagram and the number of groups, visually indicating the transformer group vectors;

4. For transformers without nameplates, there is no need to choose the wiring method and wiring group. The instrument can blindly measure the transformation ratio and group number;

5. Phase angle measurement function: accurately measure the phase angle between the high and low voltage sides, and can measure the transformation ratio and angle of non integer point transformers;

6. The instrument is equipped with functions such as high and low voltage reverse protection, transformer short-circuit protection, and turn to turn short-circuit protection;

7. The instrument is equipped with a 7-inch color touch screen with a resolution of 800 × 480 pixels for more intuitive display of test data. It can be configured with Chinese/English operation menus and real-time printing and output of results;

8. The instrument has a built-in clock to display date and time, and is equipped with data storage function (can store 1000 sets of test data);

9. The instrument has a USB interface that can transfer test data to a USB drive; Equipped with RS232 interface to transmit test data to the backend;

10. The instrument adopts two power supply methods, AC and DC, to meet the usage needs of different sites; The alarm function for low battery level, when the battery level is below 20%, the LCD will turn off and the instrument will emit a continuous beep alarm sound to remind the user to charge in a timely manner (pay attention to turning off the power switch in a timely manner).