Abstract
DC circuit breakers (DCCBs) are a key technology for the safe and reliable operation of envisioned medium voltage and high voltage DC grids. As there are no current zero-crossings in DC systems and fault current interruption times are required to be at least one order of magnitude shorter than in conventional AC systems, new types of DCCBs are being developed. Hybrid DCCBs featuring an ultrafast mechanical switch based on a Thomson coil (TC) actuator are considered a promising solution. In this contribution a 2D axisymmetric multiphysics simulation model of a TC actuator is established and a parameter study of the coil design is conducted, aiming to optimize the TC actuator for the application in a hybrid DCCB. The results indicate that the proposed coil design can improve the TC actuator performance regarding energy conversion efficiency as well as the resulting opening time.
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