Abstract
The discharge caused by metal particles is one of the key reasons for the fault of SF6 gas insulation system, and the threat of metal particles to gas-solid interface insulation is greater than that of gas gap only. In this paper, cylinder and conical epoxy resin insulator samples as well as a parallel plate electrode fixed by a metal protrusion are employed to simulate the discharge in SF6-epoxy resin interface. The arc channel of samples immersed in 0.06MPa SF6 under negative standard lightning impulse voltage is observed by a photoelectric joint diagnostic platform based on ICCDs. The results show that the breakdown voltage of cylinder insulator is the highest both in the clean and protrusion case, for the protrusion is the farthest from the insulator surface and its electric field is the least distorted. The arc pictures show that compared with the cylindrical insulator, it is easier for the conical insulator to attract the discharge channel to its surface, for the higher normal component of electric field strength along the surface. In conclusion, the attractive effect from the insulator surface is the weakest in the cylinder insulator, and the probability of participating in the discharge process along the surface is the lowest. Therefore, in engineering design, two methods can be used to restrain the harm of metal particles to surface discharge: keep free metal particles away from the solid surface, and avoid the wedge-shaped triple junction structure.
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