An inductive 700 MW high voltage pulse generator

• A repetitive inductive 700-MW high-voltage pulsegenerator that delivers a 150-ns square pulse with 20-ns rise timeat 150 kV has been constructed. The pulse generator has a 1:10 aircore transformer connected to a 25-Ω pulse forming line (PFL).The transformer and the PFL are both constructed using highvoltagecables. The closing switch of the PFL is a spark gap thatis in a water tank together with the cable endings of the PFL andtransformer. The electric field at the cable endings is refractivelygraded by the high permittivity of the surrounding water. ThePFL is charged in 2.5 μs to 170 kV, and the electric field in theclosing switch of the PFL reaches 33 kV/mm until the thresholdvoltage is exceeded. The efficiency of the pulse generator is 40%.The authors believe that this concept can be up-scaled to a 25-GWgenerator operating at 500 kV. An electric circuit simulation ofa 25-GW pulse generator and an electrostatic simulation for arefractive cable ending are presented.

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