Design of Inflatable Grading Ring for Field Test of UHV Equipment

In order to solve the problem that the traditional metal grading ring in the ultra-high voltage(UHV) field test is so large, heavy and difficult to install in the test field that reduce the test efficiency and increase workload, a design of new inflatable grading ring especially for integrated test platform was proposed. The material and mechanical structure of the inflatable grading ring are designed according to the environment requirements of the field test. Then the style and size of the grading ring are optimized by finite element analysis of electric field. The factory test and field test are carried out and proved that the proposed inflatable grading ring is easy to use, transport, store, and meets the requirements of field test of UHV equipment within 1200kV, which can be promoted to the future UHV field test.