| Title |
Design and Verification on Axial Magnetic Field Electrode of Vacuum Interrupter for KTX-EUM Railway Vehicle |
| Authors |
이태훈(Tae-Hoon Lee) ; 주흥진(Heung-Jin Ju) ; 차영광(Young-Kwang Cha) ; 나정효(Jung-Hyo Nah) |
| DOI |
https://doi.org/10.5370/KIEE.2023.72.5.688 |
| Keywords |
Vacuum interrupter; Axial magnetic field; Breaking performance; Electrode design; Magnetic field analysis |
| Abstract |
The main circuit breaker(MCB) used in railway vehicles has mainly applied a vacuum interrupter(VI) due to its long life and easy maintenance requirements. When an accident such as a short circuit or ground fault occurs in a railway vehicle, the VI may interrupt the fault current. The electrodes of the VI are closely related to the breaking performance, so it is very important to design the shape of them. In particular, when a high breaking capacity is required, such as railway vehicles, most manufacturers control the arc by applying a axial magnetic field electrode in VIs. For a axial magnetic field electrode, by diffusing the arc throughout the electrode surface by a magnetic field, melting of the contact can be minimized and the electrical endurance life can be improved.
The breaking performance of VIs could be verified through a high power short-circuit test, but it takes a lot of cost and time, so most manufacturers evaluate the breaking performance through magnetic field analysis, but the validity of analysis result is not verified. In this study, an electrode of a vacuum interrupter applied to a high-speed vehicle was designed, and a magnetic field analysis was performed to verify its effectiveness, and a sample was manufactured for an actual electrode part to measure magnetic flux density. As a result of comparing the analysis and the measured values, similar results were confirmed in most parts except for the center and edge of the electrode, and the validity of the design was verified. |