AC withstand voltage test is an important means of insulation testing for power equipment, and its precautions mainly include the following aspects:
1. Preparation for the experiment:
① Ensure that the tested equipment has undergone non-destructive testing and the results are qualified.
② Clean the insulation surface of the tested equipment to avoid contamination that may affect the test results.
③ For multi oil equipment, the oil should be allowed to stand still for a period of time before testing to ensure its stability.
2. Selection of experimental equipment:
① Select appropriate AC high-voltage power supply, voltage regulator, control and protection device, and measuring instrument.
② Ensure that the rated voltage, current, and capacity of the testing equipment match the tested equipment.
3. Test wiring and safety:
① Connect the wires correctly according to the test requirements to ensure sufficient distance between the high voltage and the ground.
② High voltage and testing personnel should have sufficient safety distance to prevent electric shock accidents.
③ Set up clear safety warning signs at the test site and assign dedicated personnel for supervision.
4. Experimental operation:
② After applying the test voltage, unless otherwise specified, the duration should be 1 minute.
③ After the withstand voltage test, the voltage should be uniformly reduced to below 25% of the test voltage within 5 seconds, then the power supply should be disconnected and the test object should be grounded.
5. Evaluation of experimental results:
① Observe whether the leakage current of the tested equipment exceeds the specified value during the experiment.
② Pay attention to whether there is any discharge phenomenon in the tested equipment during the experiment.
③ Check whether the waveform and frequency of the test voltage meet the requirements.
6. Post experiment processing:
① After the experiment is completed, the tested equipment should be fully discharged to ensure safety.
② Clean up the testing site and return the testing equipment.
7. Safety measures:
① Strictly adhere to safety operating procedures to ensure personal and equipment safety during the testing process.
② During the experiment, there should be a dedicated person to supervise and be prepared to take emergency measures at any time.
③ For large or important equipment, a detailed testing plan and safety measures should be developed before testing.
8. Other precautions:
① When conducting AC withstand voltage tests, the rated voltage and insulation level of the tested equipment should be taken into account to ensure the effectiveness of the test.
② For different types of equipment, different testing methods and voltages may be required.
③ During the experimental process, close attention should be paid to the operating status and test results of the tested equipment in order to promptly identify and address potential issues.
In short, when conducting AC voltage withstand tests, it is necessary to strictly comply with relevant regulations and standards to ensure the accuracy and safety of the test. At the same time, a reasonable testing plan and safety measures should be developed based on the actual situation and testing requirements of the tested equipment.
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