Current injection circuit breakers consist of a mechanical interrupter (MI) with a current injection and an energy dissipation branch in parallel. The performance of the complete device is largely determined by mechanical operation time and interruption performance of the MI. In the standard configuration, current injection is realised using a pre-charged inductorcapacitor circuit. A higher interruption performance of the MI makes it possible to scale down the resonant injection circuit, and thus have a more economical design. Additionally, the implementation of more complex injection circuits that quickly create zero crossings, while maintaining favourable conditions for interruption, can lead to economic benefits. In this study, the interruption performance of a model gas interrupter as part of a current injection topology is investigated. The results are used to verify a corresponding simulation model and two-dimensional upgrade circuits that influence the injection current to increase the range of interruptible fault currents. On the basis of experimental results, the simulation model is used to investigate the performance of upgrade circuits for the use in high-voltage direct current (HVDC) systems. The results indicate that using improved injection circuits can considerably increase the economic advantage of current injection circuit breakers compared with other topologies.
HVDC circuit breakers are a key technology for the reliable and safe operation of multiterminal HVDC networks. Current injection topologies can perform this duty while offering advantages like low on-state losses and a robust and economical structure. The key component for its performance is the mechanical interrupter. In this paper, four improved injection circuits are proposed. These are designed to influence the injection current shape to facilitate interruption and reduce component cost. Based on a simulation study using synthetic fault cases, interruption performance and component use of the improved injection circuits are compared to a reference CI topology. The results promise that the same performance can be achieved with considerably scaled down components.
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