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Use of transformer dc resistance tester

time:2020/6/3   source:华天电力  reading:317 time

Power workers often need to test the resistance value of high-voltage cables, power transformers and other power equipment in actual work to make accurate judgments on their insulation performance. DC resistance testers are also a very common power testing equipment Introduce how to use DC resistance tester.


1. Preparation before testing:


Connect the power cord, and turn on the power switch, then the machine will display the following information.


Start measurement:


Wiring according to the following wiring diagram as needed:


After confirming that the resistance to be tested and the instrument are reliably connected. Press the "▼" "▲" corresponding buttons displayed on the screen to switch the test current.


Transformer DC Winding Resistance Tester.png


When measuring each phase winding of the same transformer at the same voltage level, the same current should be selected for measurement to avoid system errors. The larger the transformer capacity, the smaller the resistance of the winding, the larger the selected test current, pay attention to the measurement of the selected test current The range should be greater than the actual resistance value. Press the "Measure" button to start the test. At this time, "Charging" appears on the screen, and there is a charging progress bar to show the charging process. After charging, the screen prompts "Please wait while measuring". The display area in the middle of the screen shows the measured resistance value.


After the reading is stable, read the value, and then press the "save" key to store the measured data or press the "print" key to print the data as needed. If the measured resistance exceeds the range that can be measured by the current range, the screen prompts "overrange" At this time, you should press the "Exit" key to exit the measurement, and then reselect the test current and try again.


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