Abstract: A mechanical reliability testing platform for tri-post insulators in a GIL device includes a horizontal-GIL-arrangement-form fixed-tri-post-insulator mechanical reliability verification testing platform for a horizontal dynamic insertion and extraction test, and a turning-GIL-arrangement-form fixed-tri-post-insulator mechanical reliability verification testing platform for a vertical dynamic insertion and extraction test. A driving unit is employed to realize the insertion and extraction of the conducting rod of the sliding-tri-post-insulator GIL form unit at the contact holder, so as to simulate the reciprocating forces on the fixed tri-post insulator induced by the thermal expansion and contraction of the pipe during the actual operation of the GIL, and simulate the working condition of the fixed tri-post insulator under abnormal forces when the GIL experience foundation settlement.

Abstract: A mechanical reliability testing platform for tri-post insulators in a GIL device includes a horizontal-GIL-arrangement-form fixed-tri-post-insulator mechanical reliability verification testing platform for a horizontal dynamic insertion and extraction test, and a turning-GIL-arrangement-form fixed-tri-post-insulator mechanical reliability verification testing platform for a vertical dynamic insertion and extraction test. A driving unit is employed to realize the insertion and extraction of the conducting rod of the sliding-tri-post-insulator GIL form unit at the contact holder, so as to simulate the reciprocating forces on the fixed tri-post insulator induced by the thermal expansion and contraction of the pipe during the actual operation of the GIL, and simulate the working condition of the fixed tri-post insulator under abnormal forces when the GIL experience foundation settlement.

Abstract: An assessment method for flashover faults of 220 kV or higher porcelain live tank circuit breakers, including the following steps: step 1, collecting fault current waveform characteristic data from a fault current waveform in a fault oscillograph, said fault current waveform characteristic data including a time duration t1 from an instant of arc quenching to an instant of fault current initiation, a time duration t2 of the fault current, and waveform characteristics of the fault current; step 2, determining the type of the flashover fault according to the fault current waveform characteristic data: the type includes external flashover, restrike internal flashover, and internal flashover on the insulator inner. The assessment is performed based on the oscillographic fault current data. Since different types of flashover fault vary in mechanism, the waveforms thereof also show different features.