The test results of the insulation oil withstand voltage tester are an important basis for judging the performance of insulation oil. The following is the method for judging the test results:
1. First spark discharge voltage
① Importance: The initial spark discharge voltage is an important reference point for determining whether the oil sample is qualified.
② Judgment criteria: If the initial spark discharge voltage is particularly low, it may indicate the presence of impurities, moisture, or other factors affecting the insulation performance in the oil sample. At this point, it is necessary to take a new oil sample for testing or contact the manufacturer for analysis.
2. Changes in Spark Discharge Voltage Values
① Gradual increase: usually occurs when the insulation performance of the oil sample gradually increases after treatment or improvement.
② Gradually decreasing: This may mean that there are increasing impurities in the oil sample or the oil quality is gradually deteriorating, and it is necessary to take a new oil sample for testing or contact the manufacturer.
③ Low at both ends and high in the middle: If the spark discharge voltage value shows a trend of low at both ends and high in the middle during the testing process, this may be a normal phenomenon. But if the deviation is too large, it may mean that the quality of the oil sample is unstable or there are other problems.
3. The average of multiple test results
① Importance: The average of multiple test results can more accurately reflect the performance of insulating oil.
② Judgment criteria: If the average value of multiple test results is low and the dispersion is large (i.e. the difference between each test result is large), it may indicate that there are many unstable factors or impurities in the oil sample. At this point, it is necessary to take a new oil sample for testing and consider replacing the insulation oil.
4. Discrepancy of withstand voltage value
① Importance: The variability of withstand voltage values can reflect the stability of oil sample performance.
② Judgment criteria: If the dispersion of the withstand voltage value is large, that is, the difference between multiple test results is significant, it may indicate that there are significant performance fluctuations or unstable factors in the oil sample. At this point, it is necessary to take a new oil sample for testing and consider further processing or improvement of the insulation oil.
5. Other precautions
① Testing conditions: During the testing process, consistency of testing conditions should be ensured, including temperature, humidity, electrode spacing, etc. The changes in these factors may affect the accuracy of the test results.
② Instrument calibration: Regularly calibrate and maintain the intelligent insulation oil withstand voltage tester to ensure that it is in good working condition.
③ Operating standards: During the testing process, the instrument manual or relevant standards should be strictly followed to avoid errors caused by human factors.
In summary, the test results of the intelligent insulation oil withstand voltage tester are an important basis for judging the performance of insulation oil. When judging the test results, it is necessary to comprehensively consider factors such as the initial spark discharge voltage, changes in spark discharge voltage values, the average of multiple test results, and the variability of withstand voltage values. At the same time, it is also necessary to pay attention to the consistency of testing conditions, calibration and maintenance of instruments, and compliance with operating standards.
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