Magnetization Characteristics Due to Fault Angle of Transformer Type SFCL with Two Isolated Secondary Windings
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ORIGINAL ARTICLE
Magnetization Characteristics Due to Fault Angle of Transformer Type SFCL with Two Isolated Secondary Windings Tae‑Hee Han1 · Sung‑Hun Lim2 · Seok‑Cheol Ko3 Received: 4 March 2020 / Revised: 9 June 2020 / Accepted: 28 August 2020 © The Korean Institute of Electrical Engineers 2020
Abstract In this paper, a transformer type superconducting fault current limiter (SFCL) with two isolated secondary windings was fabricated to increase the current limiting capacity. As the magnetization current increased due to the large transient fault current immediately after the fault, the magnetization force variation, the operating range of the flux linkage, and the voltage region variation were compared at fault angles of 0° and 90°, respectively. The short-circuit test analyzed the current limiting operation, power consumption, and energy consumption characteristics according to the fault angle immediately after the fault occurrence. The results showed that the fault angle of 0° could limit the fault current much more than the fault angle of 90°. In addition, it was confirmed that the magnetization force variation, the operating range of the flux linkage, and the voltage induced in the primary winding were all much larger at the fault angle of 0° than at the fault angle of 90°. Keywords Fault angle · Isolated secondary windings · Magnetization current · Magnetization force variation · Superconducting fault current limiter (SFCL) · Transformer type
1 Introduction Short circuit accidents occur frequently in power systems for a number of reasons, and superconducting fault current limiters (SFCLs) are the most commonly used devices to prevent them [1–3]. Under normal operating conditions, the SFCL is the ideal device for limiting fault current in the event of a short circuit due to near-zero impedance and fast steady state transitions. To date, the characteristics of various types of SFCLs such as resistive type, saturated * Seok‑Cheol Ko [email protected] Tae‑Hee Han [email protected] Sung‑Hun Lim [email protected] 1
Department of Aero Materials Engineering, Jungwon University, Goesan, Chungbuk, Republic of Korea
2
Department of Electrical Engineering, Soongsil University, Seoul, Republic of Korea
3
Industry-University Cooperation Foundation and Regional-Industrial Application Research Institute, Kongju National University, Gongju, Chungnam, Republic of Korea
iron-core type, magnetic shield type, bridge type, active and high-speed switching type, inductive and hybrid type, transformer type, flux-lock type, and flux-coupling type have been studied [4–14]. When a large fault current occurs, the superconducting element has to bear the fault current detection and the limiting operation at the same time, which is a burden for the superconducting element. As a way to increase the current limiting capacity, studies on the current limiting characteristics of the hybrid type SFCL, in which a superconducting element is connected in series or in parallel, have been carried out [15–18]. In addition, t
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