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Research on a Trigger Device for a High-Performance Triggered Vacuum Switch
Wung-Hoa Park,Hyung Seop Kong,Byung-Joon Lee,Marius Dehmer,Marcus Iberler 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.7
We have done research to develop a trigger device for a high performance triggered vacuum switch (TVS) with the trigger device of a gas switch (GS). The trigger device is a critical component deciding the characteristics of initial plasma ignition in the TVS and the GS. Furthermore, the lifetime of the TVS is dominantly determined by the trigger device. In principle, the initial plasma generation of the TVS and the GS is explained by surface flashover. However, the structure of the GS trigger electrode is simpler than that of the TVS trigger device. We interested in the simple disc-type shape of the high dielectric ceramic used in the GS trigger device. In general, high dielectric ceramics are hard materials, and they can easily be cracked during machining. The simple disc-type shape is a remarkable advantage in the fabrication of a trigger device without cracks. However, although the GS trigger device has the structural merit, it could not be used in the TVS because the GS is operated at higher pressure than the TVS. In this research, we fabricated the GS trigger device and investigated the characteristics of the igniting plasma at a pressure of 10-6 mbar. In the follow-on research, this trigger device will be inserted into a TVS, and its operation will be investigated. This results of this research should contribute to the understanding of surface flashover in vacuum and lead to improved TVSs and GSs.
Study of the TVS Trigger Geometry and the Triggered Vacuum Conditions
Wung-Hoa Park,Moo-Sang Kim,Yoon-Kyoo Son,Byung-Joon Lee,Klaus Frank 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.6
This presentation focuses on the optimization of the trigger unit of a six-rod triggered vacuum switch. The different configurations of the trigger pin and of the trigger electrode have been considered to study the electric field distribution at the triple points of the unit embedded in the cathode. Electric field simulations with a planar and a circular head of the trigger pin in combinations with a convex-shaped and a concave-shaped trigger electrode have been done to optimize the field enhancement. The simulations were done with an applied trigger pulse voltage of Utrigger = 5 kV and with a discharge voltage for the main switch of Uswitch = 20 kV. The experimental values were Utrigger = 40 kV and Uswitch = 5 kV. The simulation results show that the combination of a circular trigger pin head and a concave trigger electrode yields the highest electric field of 9.6 ·106 V/m at the triple point. In-parallel experiments have been performed with those four trigger configurations. The results of the experiments, however, cannot yet be used to confirm the trend in the results of the field simulations.
Research on the Characteristics of a Triggered Vacuum Switch with a Surface Flashover Trigger Device
Park Wung-Hoa,Kong Hyung Seop,안석호,Lee Byung-Joon 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.10
A triggered vacuum switch (TVS) has been applied in high pulsed power systems. It is operated by using the plasma sequentially generated at a trigger device and a main electrode. Firstly, the initial plasma is ignited at the trigger device by surface flashover mechanism. Then, the main plasma, which is induced by the initial plasma, is generated at the main electrode. In general, the research on the characteristics of trigger jitter, main jitter, and delay is essential to develop a high-performance TVS. These characteristics are crucially affected by the trigger device. Accordingly, we have fabricated a trigger device with a ring electrode and measured the trigger jitter, main jitter and delay at voltage up to 20 kV. The measured values of delay are 4.3-9.6 μs, of the trigger jitter are 0.56-2.1 μs, and of the main jitter are 3.1-5.0 μs. As a next step, we plan to continue research of characteristics with a new trigger pulse generator having a rise time of hundreds of nanoseconds.