Summary
This paper investigates transient fault behaviour on overhead lines (OHLs) within multiterminal high-voltage direct-current (MTDC) systems, with emphasis on the energy-absorption requirements of DC circuit breakers (DC-CBs) during fault interruption and reclosing. OHLs differ electrically from cables: they exhibit higher characteristic impedance and faster electromagnetic wave propagation, which produce distinct fault transient signatures. OHLs are also more prone to transient faults unlike cable systems. These characteristics motivate the need for reclosing-capable DC-CBs in OHL-equipped MTDC systems; a typical strategy is to attempt a reclose a few hundred milliseconds after interruption, so that in case of a transient fault, the system can keep operating nominally. When interrupting fault currents, DC-CBs must absorb energy stored in the transmission lines, cables, and any damping resistors, as well as energy injected by converters during fault current suppression after the operation of a DC-CB.
Read more Read lessAn MTDC network that includes both OHL and cable segments is analysed through EMT
(Electromagnetic Transient) simulation results to understand factors affecting absorbed energy in a DC-CB. Hardware test results of a VARC(Voltage source converter Assisted Resonant
Current)-type DC-CB with rapid auto reclosing function are also presented. Simulation and experimental results indicate that the VARC DC-CB’s energy-absorption capacity is sufficient to support reclosing operations, validating the feasibility of reclosing strategies for OHL-based
MTDC links and providing quantitative guidance for breaker rating and system design.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | B4_10944_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | Japan |
| Study committees | |
| File size | 1 MB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
MANOHAR Rutvika - Mitsubishi Electric Corporation Japan; TAHATA Kazuyori - Mitsubishi Electric Corporation Japan; TERADA Yuito - Mitsubishi Electric Corporation Japan; NEE Simon - Scibreak AB Sweden; MODEER Tomas - Scibreak AB Sweden; XU Lie - Mitsubishi Electric Europe-Bv UK
Keywords
DC Circuit Breaker (DC-CB), HVDC, MTDC, VARC, Switching Station, Energy, Absorption
