Abstract
—This article proposes a methodology for characterizing short-time withstand current with HVDC switchgear, which aims informing the ongoing standardization work on DC switchgear in IEC TC17. To maintain commonalty in
methodology with AC switchgear standards, it is proposed that the DC short-time withstand stress is described with an equivalent RMS current and duration, in addition to a peak fault current. Considering much different DC system dynamics, a wide range of DC topologies and DC fault scenarios, it is proposed to utilise Joule integral to determine rated short-time withstand current. DC
systems are classified in 3 topologies to account for the industry HVDC experience and the development of future DC grids: VSC HVDC, LCC HVDC, and DC systems with DC CBs. For each topology, short-circuit current waveform is characterized and expressions for rated parameters are derived, considering relevant operating conditions with worst-case stresses. The accuracy of
analytical expressions, and the recommended numerical values are verified using detailed simulation models with relevant test cases and a range of operating conditions.
methodology with AC switchgear standards, it is proposed that the DC short-time withstand stress is described with an equivalent RMS current and duration, in addition to a peak fault current. Considering much different DC system dynamics, a wide range of DC topologies and DC fault scenarios, it is proposed to utilise Joule integral to determine rated short-time withstand current. DC
systems are classified in 3 topologies to account for the industry HVDC experience and the development of future DC grids: VSC HVDC, LCC HVDC, and DC systems with DC CBs. For each topology, short-circuit current waveform is characterized and expressions for rated parameters are derived, considering relevant operating conditions with worst-case stresses. The accuracy of
analytical expressions, and the recommended numerical values are verified using detailed simulation models with relevant test cases and a range of operating conditions.
| Original language | English |
|---|---|
| Pages (from-to) | 1-10 |
| Number of pages | 10 |
| Journal | IEEE Transactions on Power Delivery |
| DOIs | |
| Publication status | Published - 13 Oct 2023 |
Bibliographical note
The authors are thankful to all members of IEC TC17, WG6 (IEC TS 62271-5 High-voltage switchgear and controlgear –Part 5-Common specifications for direct current switchgear) for the contribution and support.Keywords
- DC switchgear
- HVDC protection
- DC Circuit-breakers