The LCD display interface mainly consists of nine screens, including the main menu and eight sub-function interfaces, which are described in detail below.
1. Main Menu Interface
The main menu is shown in Figure 3:
Figure 3. Main Menu
After power-on, the main menu is displayed, as shown in Figure 3. The main menu has eight function options, including: Parameter Setting, Three-Phase Turns Ratio, Three-Phase Turns Number Ratio, Single-Phase Transformer, Z-Type Transformer, Parallel Operation of Main Transformers, Historical Data, and System Calibration. Use the ↑, ↓, ←, → keys to select, and the selected item's text is displayed in reverse video (in the figure, the selected item is "Parameter Setting"). Press the Enter key to enter the corresponding function interface. The top line of the screen displays status parameters, including: program version number, date and time, etc. The bottom line of the screen is the prompt bar, providing simple operation prompts for the user to facilitate correct operation. It also displays the internal battery voltage amplitude and remaining capacity, so that the operator can observe the battery status at any time and charge it promptly when the battery is low.
2. Parameter Setting Screen of the Transformer Turns Ratio Tester
When the 'Parameter Setting' function is selected, the parameter setting screen is entered first, as shown in Figure 4.
On the parameter setting screen, the items to be set include: Test Object Number, Rated Turns Ratio, Total Number of Taps, Equal Tap Step, Set Date, Set Time, etc. The bottom line of the display is the prompt line, which prompts the operator on how to operate. On the interface of Figure 4, press the up and down keys to move the cursor, press the [Enter] key to change the color of the selected parameter item, press the numeric keys to input the required parameter, then press the [Enter] key to make the setting effective, and the color of the selected parameter item returns to normal. After setting, press the [Exit] key to return. The meaning and function of each parameter are as follows:
1. Test Object Number: Refers to the number of the transformer under test, with a maximum of 6 digits.
2. Rated Turns Ratio: Refers to the voltage ratio between the high-voltage side and low-voltage side of the rated tap of the transformer under test.
3. Total Number of Taps: Refers to the total number of tap positions of the transformer's tap changer.
4. Equal Tap Step: The voltage percentage adjusted per tap of the transformer.
5. Set Date: Set the current date.
6. Set Time: Set the current time.
Figure 4. Parameter Setting Screen
3. Three-Phase Turns Ratio Test of the Transformer Turns Ratio Tester
Figure 5. Wiring Prompt Screen for Three-Phase Turns Ratio Test
Before conducting the three-phase turns ratio test, parameter setting should be performed first. Press the [Setting] key or select the "Parameter Setting" item and press [Enter] to enter the parameter setting screen for parameter setting. After setting the parameters, press the [Exit] key to return to the main interface, select the "Three-Phase Turns Ratio" test option, and press the [Enter] key to enter the wiring prompt screen (as shown in Figure 5). The screen provides a detailed wiring diagram, and the operator can wire according to the diagram.
After wiring is completed, press the [Enter] key to start the automatic test. The test automatically counts and stops counting after 55 counts. After the test is completed, the test result screen is displayed. The prompt line and test result screen are shown in Figure 6.
Figure 6. Three-Phase Turns Ratio Test Result Screen
After the test is completed, the results are displayed on the LCD screen. In Figure 6, it can be seen that the left side of the screen displays the test data results, including: three-phase high-voltage side voltage values, three-phase low-voltage side voltage values, phase angle values between high and low voltage of three phases (the above three items are data during the test process), the current tap turns ratio value of each phase, the measured rated turns ratio values of three phases, the percentage error of three-phase turns ratio, the determined connection group, the test count, and the test status. The right side displays the set parameters and the vector diagram of the connection group. In the figure, it can be seen that the current connection group is 0 o'clock, so the high-voltage side vector diagram (outer large triangle) and the low-voltage side vector diagram (inner small triangle) coincide in angle direction. After the test is completed, press [Store] to save the test results, [F4] to print. Press [Exit] to return, [Enter] to retest.
4. Three-Phase Turns Number Ratio Test
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