Using a transformer ratio bridge to measure the transformer ratio is cumbersome and has a narrow measurement range, which no longer meets the fast-paced and high-efficiency requirements of modern measurement. To this end, our company has adopted modern electronic technology to develop a new generation of transformer ratio and vector group tester. It is small in size, light in weight, high in accuracy, and good in stability. It features a large-screen Chinese character display, menu operation, and a user-friendly interface. The ratio and vector group can be measured in one go. This instrument is an ideal testing instrument for the power industry.



Using a transformer ratio bridge to measure the transformer ratio is cumbersome and has a narrow measurement range, which no longer meets the fast-paced and high-efficiency requirements of modern measurement. To this end, our company has adopted modern electronic technology to develop a new generation of transformer ratio and vector group tester. It is small in size, light in weight, high in accuracy, and good in stability. It features a large-screen Chinese character display, menu operation, and a user-friendly interface. The ratio and vector group can be measured in one go. This instrument is an ideal testing instrument for the power industry.

Operation Method

1. Wiring: Turn off the power switch of the instrument, and connect the wires according to the following method. Single-phase transformer Three-phase transformer Instrument Transformer Instrument Transformer A A A A B X B B C Not connected C C a a a a b x b b c Not connected c c The neutral point of the transformer is not connected to the instrument or to the ground. Connect the instrument ground wire. Plug one end of the power cord into the power socket on the instrument panel, and connect the other end to the AC 220V power supply. Note: Do not reverse the high and low voltage connections of the transformer! Set wiring method Set standard ratio Start data measurement View historical data ↑: Select Confirm: Execute 2. Turn on the power switch of the instrument. After a moment, the main menu appears on the LCD screen, as shown below. The selected menu is displayed in reverse (black background with white text). At this time, press the "↑" key to select the function menu, and press "Confirm" to execute the corresponding function. Note: Press and release the key for one key input. Set wiring method Connection: Yy Set standard ratio Start data measurement View historical data ↑: Select Confirm: Save 3. Connection method setting: After entering the connection method setting, the LCD screen displays as follows. At this time, press the "↑" key to select the connection method, and press "Confirm" to save the connection method and return to the main menu. Set wiring method Set standard ratio Ratio=25.000 Start data measurement View historical data →: Shift ↑↓: Increase/Decrease Confirm: Save 4. Set standard ratio: After entering the standard ratio setting, the LCD screen displays as follows. At this time, press the "→" key to select the data digit, and the selected digit is displayed in reverse. Press the "↑" and "↓" keys to modify the data. After selecting a digit, press the "↑" and "↓" keys to cycle the digit from 0 to 9. If it is the first digit, it can only cycle from 1 to 9, and 0 will not appear. After selecting the decimal point, press the "↑" and "↓" keys to move the decimal point cyclically. Set wiring method Set standard ratio Tap ratio=0.00% Start data measurement View historical data →: Shift ↑↓: Increase/Decrease Confirm: Save If the transformer has taps, the standard ratio set here is the standard ratio for the middle tap. After pressing "Confirm" to save the ratio, the LCD screen displays as follows. The tap ratio setting method is the same as the standard ratio setting method. If the transformer has taps, set it according to the actual value; otherwise, set it to 0.00%. Press "Confirm" to save the tap ratio and return to the main menu. 5. After warming up for 5 minutes, select "Start data measurement" and press "Confirm". The display is as follows: Connection=Yy? Ratio=25.000? →: No Confirm: Yes ↑↓: Change tap The ratio value displayed on the screen is the actual standard ratio required for this measurement. Press the "↑" and "↓" keys to modify this value. Each modification step equals the set standard ratio multiplied by the tap ratio. After the measurement is completed, the display is as follows: 3rd time Total 3 times Group: 12 o'clock AB: 25.008 0.03% BC: 25.010 0.04% CA: 25.000 0.00% ↑: Page up →: Print Confirm: Return After each measurement, the instrument automatically saves the data, up to 30 data sets. When more than 30, the current data is stored as the 30th, and the first data is cleared, i.e., first in, first out. The left side of the first line shows the position of the current data in the historical data, and the right side shows the number of historical data sets. The second line shows the group. The third line left shows the ratio of phase AB, and the third line right shows the relative error of phase AB, and so on. If measuring a single-phase transformer, only the first three lines are displayed. If the relative error of the measured ratio is greater than 10%, display ">10%"; if the relative error is less than -10%, display "<-10%". Press the "↑" key to view data. Press the "←" key to enter the print menu, where you can print the current data, print all data, and clear all historical data. Press Confirm to return to the main menu.