Precautions for power frequency withstand voltage test:
1. Test personnel should divide responsibilities, set a safe distance at the test site, carefully inspect the grounding of the test sample and test transformer, and assign a dedicated person to monitor safety and observe the status of the test sample.
2. The main parts of the test sample should be cleaned and kept dry to avoid damaging the sample and causing errors in the test values.
3. For the testing of large equipment, it is generally necessary to first conduct a no-load test of the test transformer, that is, to increase the voltage to the test voltage without connecting the test sample, in order to calibrate the accuracy of the instrument indication and adjust the ball spacing of the discharge ball gap.
4. When conducting a voltage withstand test, the boosting speed should not be too fast, and sudden pressure should be prevented. For example, if the regulator is not at zero position, it should be suddenly closed, and the power should not be suddenly cut off. Generally, it should be closed when the regulator drops to zero position.
5. During the boost or withstand voltage test, if any of the following abnormal situations are found: 1. The pointer of the voltage and current meter swings greatly, 2. The tested object makes abnormal noises, 3. If the insulation is burnt or smoking, the voltage should be immediately reduced, the power should be cut off, the test should be stopped, and the cause should be identified.
6. When using this product for high-voltage testing, in addition to being familiar with this manual, it is also necessary to strictly follow relevant national standards and operating procedures.
7. When conducting capacitance experiments or DC high-voltage leakage experiments, after the experiment is completed, lower the voltage regulator to zero and cut off the power supply. Then, use a discharge rod to discharge the high-voltage end of the test sample or capacitor to ground to avoid the risk of electric shock caused by the potential remaining in the capacitor.
8. Several safety precautions for power frequency withstand voltage test: In the experiment, if the test sample short circuits or breaks down due to faults, the overcurrent relay in the control box will operate. At this moment, the voltage regulator should be returned to zero and the power supply should be blocked before removing the test sample.
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