An Inductive 700-MW High-Voltage Pulse Generator

Abstract

A repetitive inductive 700-MW high-voltage pulse generator that delivers a 150-ns square pulse with 20-ns rise time at 150 kV has been constructed. The pulse generator has a 1:10 air core transformer connected to a 25-Ω pulse forming line (PFL). The transformer and the PFL are both constructed using highvoltage cables. The closing switch of the PFL is a spark gap that is in a water tank together with the cable endings of the PFL and transformer. The electric field at the cable endings is refractively graded by the high permittivity of the surrounding water. The PFL is charged in 2.5 µs to 170 kV, and the electric field in the closing switch of the PFL reaches 33 kV/mm until the threshold voltage is exceeded. The efficiency of the pulse generator is 40%. The authors believe that this concept can be up-scaled to a 25-GW generator operating at 500 kV. An electric circuit simulation of a 25-GW pulse generator and an electrostatic simulation for a refractive cable ending are presented.Index Terms-High-voltage cable, inductive pulse generator, refractive field grading, resistive layer.

Dispersion and Dielectric Effects on Reflection and Transmission of Electromagnetic Waves Propagating in Multiple Stages of Tape-Helix Blumlein Transmission Lines

“…Finally, according to (11) and (13), the transmission matrix and current density waves in the stages of transmission lines are fixed. From (9) and (15), an important conclusion is obtained as α (m−1) −ξ (m−1) = 1 which demonstrates the law of energy conservation.…”

“…Transmission line is a device which can be employed to transport and propagate electromagnetic waves in different frequency bands, and it has important applications in power system [1,2], electromagnetic communication technology [3], signal measurement [4,5], pulse delay and transmission [6][7][8][9][10][11][12][13], and pulsed power technology [14][15][16]. Usually, the transmission line has intrinsic power capacity and working band.…”

“…From the geometric structures, the common-use transmission lines include the two-wire transmission line [1], coaxial transmission line [14,15], isolated parallel plates [16] and microstrip lines [17]. If the dispersion characteristics are considered [18], the transmission lines can be divided into two types such as the dispersive line [14] and the non-dispersive transmission line [15,16]. Helical transmission line is a kind of important transmission line including helical coils as the slowwave structure, in which the phase velocities of waves can be slowed down [19].…”

Concepts and Capabilities of In-House Built Nanosecond Pulsed Electric Field (nsPEF) Generators for Electroporation: State of Art

“…At this point, the opening switch SW2 is activated and the current is abruptly interrupted influencing high rate of change of the magnetic flux (dB/dt). Such a transient process induces voltage in the inductor, which is further discharged by a spark gap through the load [67]. The inductive energy discharge pulse generator has many drawbacks and is not used for electroporation research.…”