Direct-current circuit breaker

Abstract

The present invention discloses a direct-current circuit breaker. A magnetic coupling module is connected with an energy consumption module in series and then connected with a main current branch in parallel, the main current branch is led out through a wire outlet end A1 and a wire outlet end A2, the main current branch comprises a high-speed mechanical switch HSS, the two ends of the high-speed mechanical switch HSS are connected with the wire outlet end A1 and the wire outlet end A2 respectively, and the magnetic coupling module comprises a pre-charging capacitor C, a thyristor T and a current transformer. The energy consumption module comprises a lightning arrester, a fuse R and a switch S1; the on-line monitoring system measures the current flowing through the wire outlet end A1 or A2 and the current direction, the current flowing through the main current branch, the current flowing through the energy consumption module, the current flowing through the primary side loop of the magnetic coupling module, the voltage of the pre-charging capacitor C, the voltage at the two ends of the high-speed mechanical switch HSS and the switch displacement of the high-speed mechanical switch, and when the current direction of the system is from A1 to A2, the high-speed mechanical switch HSS and the thyristor T of the magnetic coupling module are controlled to act by measuring the current amplitude of the main current branch.

Description

technical field [0001] The invention relates to the field of large-capacity direct-current circuit breakers with rapid disconnection, in particular to a direct-current circuit breaker. Background technique [0002] The development of DC power grid is of great significance to the long-distance transmission of large-scale electric energy, the access of renewable distributed energy, and the improvement of electric energy stability. As a key component of the DC power grid, the DC circuit breaker plays an important role in closing, carrying and breaking the current under normal circuit conditions, converting the operating mode of the system, and cutting off the fault current to protect the system. It is an important equipment for building a DC power grid. one. As a crucial protection component in the DC power distribution system, the DC circuit breaker is the guarantee for the rapid breaking of the DC fault current and the safe operation of the system. The traditional mechanica...

AI Technical Summary

Problems solved by technology

The traditional mechanical DC circuit breaker has low rated current loss and strong breaking capacity, but the small current breaking time is long and the fracture insulation recovery is poor

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