Operation Method
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1. Wiring: Turn off the instrument's power switch, and connect the wires according to the method below. 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's ground wire. Plug one end of the power cord into the power socket on the instrument panel, and connect the other end to an 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 instrument's power switch. 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, you can press the "↑" key to select the function menu, and press the "Confirm" key 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 setting: After entering the wiring method setting, the LCD screen displays as follows. At this time, press the "↑" key to select the connection method, and press the "Confirm" key 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, and the digit cycles 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, and the decimal point moves 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 of the middle tap. After pressing the "Confirm" key to save the ratio, the LCD screen displays as follows. The setting method for the tap ratio is the same as that for the standard ratio. If the transformer has taps, set it according to the actual value; otherwise, set it to 0.00%. After pressing the "Confirm" key to save the tap ratio, return to the main menu.
5. After warming up for 5 minutes, select "Start data measurement" and press the "Confirm" key. The display shows as follows: Connection=Yy? Ratio=25.000? →: No Confirm: Yes ↑↓: Change tap. The ratio value displayed on the screen is the actual standard ratio needed for this measurement. You can modify this value by pressing the "↑" and "↓" keys. Each modification step equals the set standard ratio multiplied by the tap ratio. After the measurement is completed, the display shows as follows: No.3 Total 3 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 points. 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. The second line shows the group. The third line left shows the ratio of phase AB, and the 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 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, or clear all historical data. Press the Confirm key to return to the main menu.
