Features
1. Automatically measures the connection group;
2. Automatically performs group transformation;
3. Automatically switches phase sequence;
4. Automatically switches range;
5. Automatically calibrates the meter;
6. After inputting the standard transformation ratio, it can automatically calculate the relative error;
7. After one measurement is completed, the test voltage is automatically cut off;
8. Settings and measurement results are automatically saved, and previous data can be viewed;
9. For measuring on-load transformers, only input the transformation ratio once.
10. Equipped with a serial R232 interface.
11. Equipped with a micro printer, data results can also be printed directly.
Parameters
1. Transformation ratio measurement range: 1—10000
2. Group: 1—12 points
3. Accuracy: 1-1000 0.2 class
1000-10000 0.5 class
4. Power supply: AC220V ±10%, 50HZ
5. Operating ambient temperature: -5℃ ─ 40℃
6. Operating ambient humidity: <85%
7. Volume: 430×320×215mm3
8. Weight: 8Kg
Operation Method
1. Wiring: Turn off the power switch of the instrument, and wire 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 the ground. Connect the instrument ground wire. Insert 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 transformation ratio Start data measurement View historical data ↑: Select Confirm: Execute 2. Turn on the power switch of the instrument, and after a moment the main menu appears on the LCD screen, as shown below. The selected menu is displayed in reverse (black text on white background). At this time, press the “↑” key to select the function menu. Press the “Confirm” key to execute the corresponding function. Note: Press and release the key for one key input. Set wiring method Connection method: Yy Set standard transformation 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. Press the “Confirm” key to save the connection method and return to the main menu. Set wiring method Set standard transformation ratio Transformation ratio=25.000 Start measurement data View historical data →: Shift ↑↓: Increase/Decrease Confirm: Save 4. Set standard transformation ratio: After entering the standard transformation 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, the digit 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 transformation ratio Voltage regulation ratio=0.00% Start measurement data View historical data →: Shift ↑↓: Increase/Decrease Confirm: Save If the transformer has taps, the standard transformation ratio set here is the standard transformation ratio of the middle tap. After pressing the “Confirm” key to save the transformation ratio, the LCD screen displays as follows. The setting method for the voltage regulation ratio is the same as that for the standard transformation 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 voltage regulation ratio, return to the main menu. 5. After preheating for 5 minutes, select “Start data measurement” and press the “Confirm” key, then the display is as follows. Connection method=Yy? Transformation ratio=25.000? →: No Confirm: Yes ↑↓: Change tap The transformation ratio value displayed on the screen is the actual standard transformation ratio required for this measurement. Press the “↑” and “↓” keys to modify this value. The amplitude of each modification = set standard transformation ratio × voltage regulation ratio. After the measurement is completed, the display is as follows. 3rd time Total 3 times Group: 12 points AB: 25.008 0.03% BC: 25.010 0.04% CA: 25.000 0.00% ↑: Page up →: Print Confirm: Return After each measurement is completed, the instrument automatically saves the data, up to 30 data items. When exceeding 30, the current data is stored in the 30th position, and the first data is cleared, i.e., first in, first out. The left side of the first line displays the position of the current data in the historical data, and the right side displays the number of historical data items. The second line is the group. The left side of the third line is the transformation ratio of phase AB, and the right side of the third line is 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 transformation ratio is greater than 10%, display “>10%”; if the relative error of the measured transformation ratio 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 the Confirm key to return to the main menu.
