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Search Results (3)

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Keywords = Thomson coil actuator

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14 pages, 11563 KiB  
Article
Analysis of Circuits Supplying Thomson Coil Actuator Operating in Vacuum Contact Units of DC and AC Ultra-Fast Circuit Breakers
by Michal Rodak and Piotr Borkowski
Energies 2024, 17(22), 5809; https://doi.org/10.3390/en17225809 - 20 Nov 2024
Viewed by 1059
Abstract
The use of vacuum-hybrid DC circuit breaking methods allows the short-circuit current to be switched off in a shorter time, resulting in a reduction in the arc burning time. This requires the use of a drive, such as the Thomson Coil Actuator TCA, [...] Read more.
The use of vacuum-hybrid DC circuit breaking methods allows the short-circuit current to be switched off in a shorter time, resulting in a reduction in the arc burning time. This requires the use of a drive, such as the Thomson Coil Actuator TCA, capable of providing a short response time for opening the vacuum interrupter VI, regardless of its rated current. The IDD is powered by a pre-charged capacitor, which, together with the drive coil, forms an LC oscillating circuit that, when switched on by a thyristor, generates a current pulse of several kA with a frequency above 1 kHz. The paper investigates the effect of modifying the basic IDD power supply circuit by adding semiconductor diodes to shape the current pulse and improve its performance. The authors also focused on exploring the impact of the connection quality and their length and the associated loss in drive force while proving that a circuit with a reverse diode on the IDD coil is most beneficial and that the effect of the circuit on the front of the current pulse can significantly slow down the drive. Full article
(This article belongs to the Section F: Electrical Engineering)
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16 pages, 6518 KiB  
Article
Hybrid Z-Source Circuit Breaker with Thomson Coil for MVDC
by Hyun-Seung Lee, Hyung-Wook Kang, Jae-Ho Rhee and Kun-A Lee
Energies 2024, 17(1), 69; https://doi.org/10.3390/en17010069 - 21 Dec 2023
Cited by 3 | Viewed by 1658
Abstract
Hybrid circuit breakers are the most promising circuit breakers among DC circuit breakers. Conventional hybrid circuit breakers complete fault current isolation by converting current to IGBT when fault current occurs. However, in this case, the fault current continues to increase, so the IGBT [...] Read more.
Hybrid circuit breakers are the most promising circuit breakers among DC circuit breakers. Conventional hybrid circuit breakers complete fault current isolation by converting current to IGBT when fault current occurs. However, in this case, the fault current continues to increase, so the IGBT must be large enough to withstand this current. In addition, in the case of a method of detecting and operating a fault, a delay time of up to hundreds of microseconds occurs, and in a hybrid circuit breaker, this delay time is a very large value. To solve this problem, this paper proposes a hybrid Z-source circuit breaker that operates without delay for low-impedance faults. The proposed breaker is designed to reduce stress on IGBTs and mechanical switches by generating a current zero crossing, as well as to enable the breaker to trip quickly in high-risk cases such as low-impedance fault circuits. Due to the limited environment of the laboratory, we performed 600 V fault isolation experiments. As a result of the experiment, it was confirmed that the proposed circuit breaker successfully isolated the fault within 1.6 ms. The current limiting feature of the Z-source appears to reduce stress on the IGBTs and MOVs used, and it allows for faster fault isolation. Full article
(This article belongs to the Section F: Electrical Engineering)
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26 pages, 4925 KiB  
Review
A Review on Thomson Coil Actuators in Fast Mechanical Switching
by Mohmmad Al-Dweikat, Jian Cui, Shuai Sun, Mingming Yang, Guogang Zhang and Yingsan Geng
Actuators 2022, 11(6), 154; https://doi.org/10.3390/act11060154 - 10 Jun 2022
Cited by 17 | Viewed by 7959
Abstract
With the rapid development of DC power systems and the increasing demand for DC circuit breakers, electromagnetic repulsive drives-based Thomson coil actuators (TCA) are widely investigated to provide the high-speed actuating required for ultra-fast mechanical switches, especially those used in hybrid DC circuit [...] Read more.
With the rapid development of DC power systems and the increasing demand for DC circuit breakers, electromagnetic repulsive drives-based Thomson coil actuators (TCA) are widely investigated to provide the high-speed actuating required for ultra-fast mechanical switches, especially those used in hybrid DC circuit breakers. The actuating mechanism is required to be fast, reliable, and economic. This article summarizes the development of Thomson coil actuators in circuit breakers in recent years, further illustrating the basic principles and the actuator topology. In addition, it discusses the various structural components of TCA and describes the utilized modeling and simulation methods. The main objective was to provide a comprehensive overview of the TCA field. Full article
(This article belongs to the Section High Torque/Power Density Actuators)
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