The utility model comprises a support frame provided with a base, a hollow field rod fixed integrative with the support frame through a fixed bolt capable of passing through one end mounting hole;

The effect of charges remaining on a dielectric plate upon the 50% impulse surface flashover voltage U_ (50) in the non-uniform field (rod-plane gap) is investigated.

The paper introduces the structure, characteristics, working principle and field application of the new type of rod sealing unit.