What precautions should be taken when testing the breakdown voltage of insulation oil?

The breakdown voltage of insulating oil is a measure of its ability to withstand voltage inside electrical equipment without being damaged, and is one of the main means to test the performance of transformer oil. The precautions for measuring the breakdown voltage of insulating oil include:

1. The structural type of the electrode affects it. Choose which electrode according to the test method. The results of the three electrode measurements are different. The spherical electrode has the highest measurement result, followed by the hemispherical electrode; The flat electrode is the lowest.

2. The distance between electrodes is 2.5mm ± 0.1mm and needs to be calibrated with a block gauge. If the electrode distance is too small, it is easy to breakdown and the measurement result is too low. On the contrary, the measurement results are on the high side. (3) The sample should be representative, and the presence of moisture and other impurities in the oil has a significant impact on the breakdown voltage. So the sample must be shaken evenly and then injected into an oil cup.

3. The sample should be representative, and the presence of moisture and other impurities in the oil has a significant impact on the breakdown voltage. So the sample must be shaken evenly and then injected into an oil cup.

4. The experimental data has a high degree of dispersion, which is due to the multiple influencing factors that cause the breakdown process. Therefore, the test method specifies taking the average of 6 times as the test result.

5. In the experiment, it was found that the breakdown voltage value increased with the increase of breakdown discharge times. This is caused by the mixing of impurities with different properties in the oil. If the main impurities and moisture mixed in the oil are fiber impurities, the moisture is evaporated during the breakdown process, so the experimental data becomes higher and higher. But there are also reductions that need to be considered, such as whether the ambient humidity exceeds the regulations.

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