In the insulation test, the insulation resistance value at a certain moment cannot fully reflect the good or bad of the insulation performance of the test product. This is due to the following two reasons. On the one hand, the insulating material with the same performance has small insulation resistance when the volume is large. , The volume of the insulation resistance is small. On the other hand, the insulating material has a charge-absorption ratio process and a polarization process after applying a high voltage. Therefore, the power system requires that the absorption ratio—the ratio of R60s and R15s and the polarization index—R10min and R1min ratios should be measured in the insulation test of the main transformer, cable, motor, etc., and use this data to determine the insulation status. The pros and cons.
3. Why does the instrument need to be connected to the G terminal in a high-voltage, high-resistance test environment?
When the rated voltage is high at both ends of the test object, and the insulation resistance is high, the surface of the tested product is exposed to moisture, and the leakage caused by the pollution is large. The indication error is large, and the G terminal of the instrument is to be tested. The current leakage from the surface of the product is bypassed so that the leakage current does not pass through the test circuit of the meter and the error caused by the leakage current is eliminated.
4. When measuring the DC output voltage of the rated output of L and E of some types of insulation instruments, the voltage across L and E is measured with the analog multimeter DCV. Why does the voltage drop a lot, and the digital multimeter will not?
Measure the rated DC voltage directly at both ends of the insulation resistance tester L, E with an ordinary analog multimeter, and the measurement result is much smaller than the nominal rated voltage (out of the error range), and the digital multimeter will not . This is because the pointer multimeter has a smaller internal resistance, while the digital multimeter has a relatively large internal resistance. The pointer multimeter has a smaller internal resistance, and the output voltage of the insulation resistance tester LE decreases much, and is not the output voltage during normal operation. However, using a multimeter to directly measure the output voltage of the insulation resistance tester is wrong. It should be measured with a static high voltage meter with a large internal resistance or with a load voltage divider with a sufficiently large load resistance.
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