Research on the Characteristics of a Triggered Vacuum Switch with a Surface Flashover Trigger Device
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Research on the Characteristics of a Triggered Vacuum Switch with a Surface Flashover Trigger Device Wung-Hoa Park,∗ Hyung Seop Kong, Suk Ho An and Byung-Joon Lee Pohang Accelerator Laboratory, Pohang 37673, Korea (Received 3 December 2019, revised 10 February 2020, accepted 19 February 2020) 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 highperformance 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. Keywords: TVS, Trigger electrode, Ceramic DOI: 10.3938/jkps.77.919
I. INTRODUCTION A triggered vacuum switch (TVS) is used in highvoltage and high-current systems. It is operated by using the arc plasma generated by a trigger device and the main electrode. The plasma begins at the trigger device and evolves into the main electrode (Fig. 1) [1]. The operating characteristics of a TVS are significantly affected by the trigger device. In general, the critical operating characteristics of delay and jitter depend on the main voltage, insulator material, pressure and structure. A trigger device was devised by Lafferty et al. [1], and controlling the operation of the TVS was made possible. The delay and the jitter of the TVS were investigated by Aretov et al., Warren and Schaefer et al. [2–4]. They observed that the delay and the jitter depended on the main voltage. The delay characteristics of the trigger device were researched by Kamakshaiah et al. [5,6]. They investigated the relationship between the insulator material of the trigger device and the delay and announced that an insulator with a higher resistance gave a shorter delay. Recently, the structure of a trigger device has been researched by Xueling Yao, Jingliang Chen, and Wei Sun. They devised Z-shaped trigger devices whose insulator material was concave into the cathode electrode [7]. A vacuum discharge was studied by Lijun Wang et al. They researched the model of the vacuum arc [8, 9], while the initiation of a plasma trigger device was researched by ∗ E-mail:
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pISSN:0374-4884/eISSN:1976-8524
Dan Wang, Lijun Wang, Jie Liu, and Shenli Jia. They simulated 2-D plasma initiation in a vacuum breakdown [10]. We have researched a concave trigger device using an insulator material of
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