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Pub. No.:    WO/2018/219659    International Application No.:    PCT/EP2018/062859
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Fri May 18 01:59:59 CEST 2018
IPC: H01H 33/59
H01H 33/14
H01H 33/16
Applicants: ABB SCHWEIZ AG
Inventors: ZHANG, Zichi
The present disclosure relates to an electrical DC switching system (1) for extinguishing an electric arc, wherein the electrical DC switching system (1) comprises:a main contact arrangement (3) having a first contact (3a) and a second contact (3b), the main contact arrangement being operable between a closed position and an open position, a plurality of serial contacts (4) connected in series with each other and connected in parallel with the main contact arrangement (3), each serial contact (4) being operable between a closed position and an open position, wherein in a current breaking operation the main contact arrangement (3) is configured to be set in the open position before the plurality of serial contacts (4) are configured to be set in their open positions, and a current injection circuit (5) including a resonance circuit (6) configured to be connected across the serial contacts (4), and a first switch (S1) configured to be switched between an open state and a closed state and configured to be connected to the resonance circuit (6) and to the serial contacts, wherein the first switch (S1) is configured to be set in the closed state when the serial contacts (4) are in their open positions to enable an injection current to flow through the resonance circuit (6) and into the serial contacts (4) in a first flow direction which is opposite to a flow direction of an arc current flowing through the serial contacts (4).