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The role of DC resistance tester

time:2021/1/19   source:华天电力  reading:232 time

1. The role of DC resistance tester


The DC resistance tester detects the resistance value of the DC resistance to determine the welding or connection quality of the leads in the closed loop circuit, whether there is a short circuit or open circuit between the transformer windings, and whether the tap switch is in good contact, and so on. The test of the DC resistance of the transformer winding is an indispensable test item in the transformer handover test and preventive test.


Transformer DC Winding Resistance Tester.png


2. How to use the DC resistance tester


1. Connect the test product with the special test accessory cable of the instrument to ensure that the test clamps are reliably connected to the test product.


2. Turn on the power switch of the DC resistance tester, the DC resistance fast tester displays "Welcome" and enters the "range selection" interface. At this time, move the cursor through the "up and down" keys to select the desired test setting To measure range or test current, press the "OK" button, and the DC resistance tester will automatically start measuring.


3. During the test of the DC resistance tester, the LCD screen displays the charging progress bar. After the charging is completed, the value displayed on the screen is the DC resistance value of the device under test. At this time, press the "OK" key and the value will be Save and lock. If the screen displays "Charging" for a long time, it means that the range selected during the previous operation is incorrect. You need to press the "Return" key to return to the previous menu and select the higher test range to perform the test again. If it still cannot be resolved , Please check whether the test circuit is open.


4. On the data display interface of the DC resistance rapid tester, press the "print" key and the data will be printed. After the data is printed, the instrument will automatically discharge. During the discharge process, the LCD screen displays the discharge "discharge complete" and returns to the previous level menu.


5. If the test product is a transformer, please change the test clip to another phase, repeat the above operation to complete the other phase test.


6. After the test is completed, turn off the power of the tester, disconnect the power cord, discharge the tested product, and then remove the test wire clamp.

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