419 / 2022-03-15 21:14:06

Study on Failure Performance of Hollow composite Insulator under Fatigue Load

Hollow composite insulator; End connection structure; fatigue test; Failure mode

The hollow composite insulator is an important external insulation part of high voltage electrical apparatus, and it bears various stresses, such as mechanical, electrical and thermal stress. A lot of research has focused on the outdoor insulation of the insulators, but few study on the long-term mechanical performance especially the fatigue performance. In order to study the failure forms of end connection structures under different bending loads, two groups of bending fatigue tests with or without 1000 times were carried out respectively, and the failure mode of the end connection area was recorded and analyzed. The test data show that the average value of the final bending failure of the two groups of tests is very close, and the end connection structure of the insulator after 1000 bending fatigue tests is more likely to fail in the form of pulling out. Different failure trends indicate that the fatigue test is of impact on the connection area. It is recommended that fatigue test verification be carried out on special-purpose products in a timely manner to ensure the safe operation of the product.Because it is difficult to simulate the alternating load under actual operating conditions, the bending load used in the test study is the design maximum mechanical load (MML) value of a typical sample. The test data is only for reference.In order to obtain more accurate data, it will be necessary to accumulate the equivalent value of operating load and carry out more experimental research work in the future.