新闻banner
Your current location: HOME >> News >> Company news

What are the main precautions for testing the resistance of the cable and wire insulation

2021-04-25 10:47:07
second

    What are the main precautions for testing the resistance of the cable and wire insulation


    At the beginning, in order to ensure accurate measurement of the R15s and R60s test values of the insulation layer resistance of the photovoltaic cable, we generally choose a high-capacity insulation resistance tester with a fast charging speed. According to the relevant regulations of our country, the output short-circuit current of the insulation resistance tester should be greater than 0.5mA, 1 mA, 2 mA, 5 mA, and the high-requirement occasion should try to choose an insulation resistance tester with a larger output short-circuit current.


    In the insulation resistance test of photovoltaic cables, the insulation resistance value at a certain moment cannot fully reflect the insulation performance of a test product. This is because, on the one hand, the insulation resistance of the insulation material with the same performance is large when the volume is large. Small, large insulation resistance appears when the volume is small. On the other hand, the insulating material has the absorption ratio process and the polarization process of the charge after the high voltage is applied. Therefore, the power system requires the measurement of the absorption ratio-the ratio of R60s and R15s, and the polarization index-the ratio of R10min and R1min in the insulation test of main transformers, cables, motors and many other occasions, and use this data to determine the insulation status The pros and cons.


    Then for personal safety and normal testing, in principle, the insulation resistance test of the photovoltaic cable is not allowed to measure the charged DUT. Although the measurement of a charged DUT will not cause damage to the meter (in a short time), the test result is not Accurate, because the tested product is connected with other test products after being charged, the result obtained cannot truly reflect the actual data, but the resistance value of parallel or series with other test products.

    

标签

0

Recent browsing:

Related products

Relevant news

Contact us

Hand machine: 13451783528

Telephone: 0512-65976532

Mail box: rackydong@126.com

Website: www.jenlycable.com

Address: No. 115-1, Mingshi Road, Luzhi Town, Wuzhong District, Suzhou, Jiangsu


  • HOME
  • TEL
  • TOP