Dual-power fast switching device

Abstract

The invention discloses a dual-power fast switching device which comprises a first inlet wire unit having one end connected to a main power source, a second inlet wire unit having one end connected toa backup power source; a first isolation unit connected to the other end of the first inlet wire unit; a second isolation unit connected to the other end of the second inlet wire unit; a switching unit connected to the first isolation unit and the second isolation unit and further connected to a load; wherein the first isolation unit and the second isolation unit are configured to isolate the electrical connection between internal and external grids, and the switching unit is configured to switch the load to the main power source or the backup power source. The dual-power fast switching device provides a reliable protection mechanism by adding the inlet wire units and the isolation units. The isolation units can stop the internal short-circuit current from flowing to the grid. The inlet wire units provide a complete protection strategy, and can restrict the line faults to internal grid in cooperation with a switching interlock mechanism.

Description

technical field [0001] The invention relates to the field of power supply switching, in particular to a dual power supply fast switching device. Background technique [0002] With the expansion of industrial scale and the improvement of automation, new processes and technologies are widely used in all aspects of industrial production and people's lives. High-tech equipment, so power users' requirements for power quality are also continuously increasing. In the above-mentioned industries, according to statistics from authoritative departments, more than 90% of power quality problems are caused by voltage sags, and voltage sags have therefore become the most important power quality problems. [0003] Voltage sag refers to the phenomenon that the effective value of the supply voltage suddenly drops in a short period of time and then returns to the normal operating state. For the index of voltage sag, the International Institute of Electrical and Electronics Engineers (IEEE) d...

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Problems solved by technology

However, the choice of DVR control strategy depends on the type of load, which is more complicated. When the grid voltage drops below 50% or is completely interrupted, DVR cannot effectively compensate. Secondly, the capacity is small, the space occupied is large, and the construction cost is high.

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