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Preparation before measurement:
Firstly, connect the power line and ground wire to the resistance meter. Then connect the supplied test wire to the input and output terminals of the resistance meter panel and the corresponding color. Then, clamp the test clamp at the end of the test wire to the test. Both ends of the transformer windings are rubbed against the contacts to ensure good contact. Wiring method as shown below
Turn on the power switch, the display shows the following interface
The DC resistance tester provides several different measurement currents. You can press the Ҡand Ҡkeys to select according to your needs. Please pay attention to the maximum measurement range of each measurement current so that the measured DC resistance of the winding is greater than the selected current. The maximum measurement range is such that the current does not reach the predetermined value after the measurement starts, causing the resistance meter to wait for a long time.
The "View" key is used to view and print the stored measurement data. (For details, see "Viewing and Processing Data.")
After selecting the measurement method and measuring the current, press the "Measuring" button to start the entire measurement process.
Start measuring:
The resistance meter starts charging the measured winding after pressing the "Measurement" button and displays the following interface
A charging progress bar will appear in the display area of ​​the middle of the display. The upper part of the progress bar is the current value. Generally, when measuring a large inductive load, it takes a certain time for the current to stabilize and the current value increases from zero to the rated value.
Note: If the charging progress bar is stagnating for a long time when a certain current value no longer rises, the current winding resistance value may exceed the measurement range of the selected current, so that the current does not reach the predetermined value, please press “Exit†key to exit the measurement , and then select the current of the small one and try again,
When the current reaches the rated value, the charging is completed and the resistance meter starts sampling the data. The display prompts “measurement, please waitâ€. After the calculation is completed, the measured resistance value will be displayed on the display. After the data is stable, you can press the "Store" key to store or press the "Print" key to print the data.
Tip: When printing data in the measurement state, the gas meter will not end printing immediately after printing the current measurement result, but will be in a waiting state so that the next data can be printed continuously in the print report. Therefore, when measuring the tap resistance of the on-load tap-changer transformer, you can directly switch to the next tap after measuring a tap, and then press the “Retest†button to refresh the data. After being stable, press the "STORE" button to continuously store or press the "PRINT" button to print the data continuously. In this way, you can measure all the taps of the winding in turn.
When measuring the unloaded tap changer, it is not permissible to switch the tap changer directly. The measuring state must be exited and the tap changer can only be switched after the discharge is complete! End measurement: After measurement, press “Exit†key to exit the measurement. At this time, if it is an inductive load, the resistance meter will automatically start to discharge the winding. The display prompts “is discharging, please wait†and a buzzer sounds. After the discharge indicator disappears, the measurement wiring can be removed and the next winding can be tested.
Note: It is forbidden to remove the measurement wiring before the measurement process or before the discharge instruction disappears, so as to avoid the danger of equipment and personnel safety due to the winding discharge!