There are a lot of online about this, but still do not understand. If the insulation resistance is high enough, hit the pressure should also be qualified ah. There is insulation test itself when the current flow is not large, because the rock table resistance is great. But hit the pressure, I do not know is not a direct high pressure drop in the test product above, there is no great resistance to interference?
People also know that the insulation Megohmmeter is issued by the DC, and because of the relationship between the instrument resistance, the actual output current is very small, but for the withstand voltage test equipment, the internal AC transformer, the output voltage and current Of the capacity, if the equipment capacity is insufficient, the test object when the required voltage is not necessarily able to achieve, so the output current is still relatively large, which is resistant to voltage test is easy to breakdown the test object, and insulation Resistance value is very low case will not breakdown the reasons for the test object.
Insulation test Because the test voltage is low, it is not easy to damage the equipment under test. The voltage test is easy to damage the equipment under pressure when the test voltage is high. In some cases, although the withstand voltage test is passed, Causing damage, the test staff will have to use low-voltage insulation test, test the pressure test after the test equipment insulation. Under normal circumstances, insulation resistance qualified, withstand voltage test will be adopted.
Insulation resistance is measured with an insulation resistance tester (10000V or less) or an insulation shaking table (2500V or less). Since the test voltage is low, many insulation defects are not easily found; the withstand voltage test test voltage is high and the high pressure equipment is easily found Insulation defects;
Because the voltage generated by the withstand voltage test is generally greater than twice the rated voltage of the electrical equipment, and the insulation resistance test voltage value and the rated voltage is similar. And the withstand voltage test for the alternating current, insulation resistance test for the DC. Will have a certain impact on its test results.
