Mechanical DC circuit breaker and charging circuit thereof

Abstract

The invention provides a mechanical DC circuit breaker and a charging circuit thereof. The mechanical DC circuit breaker comprises a main branch, an energy absorption branch and a transfer branch. A main switch is arranged in the main branch, and the energy absorption branch and the transfer branch are connected in parallel with the main switch. The transfer branch is provided with an energy storage capacitor and an inductor connected in series, and the energy storage capacitor is connected with a charging machine. The mechanical DC circuit breaker also comprises a first voltage stabilizing element and a second voltage stabilizing element. One end of the first voltage stabilizing element is used for connecting the positive end of the energy storage capacitor, and the other end of the firstvoltage stabilizing element is connected to the ground. One end of the second voltage stabilizing element is used for connecting the negative end of the energy storage capacitor and the other end ofthe second voltage stabilizing element is connected to the ground. In the technical scheme provided by the invention, the floating potential at both ends of the energy storage capacitor can be clamped, and when the levitation potential at one end of the storage capacitor is higher than a corresponding threshold, the corresponding voltage stabilizing element will discharge, and the levitation potential at both ends of the storage capacitor are avoided from being too high, thus solving the problem that the levitation potential in a hybrid DC circuit breaker challenges the voltage withstand capacity of equipment.

Description

technical field [0001] The invention belongs to the technical field of mechanical direct current circuit breaker control, and in particular relates to a mechanical direct current circuit breaker and a charging circuit thereof. Background technique [0002] At present, there are three main forms of medium voltage DC circuit breaker switch: mechanical DC circuit breaker, solid state DC circuit breaker and hybrid DC circuit breaker. Traditional mechanical circuit breakers have poor controllability and are difficult to break DC. Although the solid-state circuit breaker has short breaking time, long life and reliable operation, it has high cost, large on-state power consumption, difficult overload commutation protection, immature voltage and current equalization technology for power electronic products, and complicated control and detection technology. It is difficult to fully promote and apply it. [0003] The improved mechanical circuit breaker combines the breaking advantage...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a mechanical DC circuit breaker and its charging circuit, which is used to solve the problem that the floating potential in the mechanical DC circuit breaker challenges the withstand voltage capability of the equipment

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