Gird-connected switch auxiliary arc-extinguishing device provided with automatic discharging control device for micro grid

Abstract

The invention discloses a grid-connected switch auxiliary arc-extinguishing device provided with an automatic discharging control device for a micro grid. The grid-connected switch auxiliary arc-extinguishing device comprises a current transformer, a non-controlled rectification circuit, a discharging device and a damping resistor, wherein a primary side of the current transformer is connected with a PPC, a secondary side of the current transformer is connected with the input end of the non-controlled rectification circuit, the output end of the non-controlled rectification circuit is connected with the input end of the discharging circuit, the output end of the discharging circuit is connected with the damping resistor, and the damping resistor is grounded. By the grid-connected switch auxiliary arc-extinguishing device, the electric energy of the power grid cannot be consumed during normal running of the power grid, the normal running state of the power grid is automatically recovered after arc extinguishing, energy saving demand is met, and meanwhile, compared with the traditional device, the grid-connected switch auxiliary arc-extinguishing device has the advantages of low construction cost, low requirement for technology and low maintenance cost.

Description

technical field [0001] The invention relates to an auxiliary arc extinguishing device for a grid-connected switch of a micro-grid with an automatic discharge control device, and belongs to the field of arc extinguishing when power electronics technology is applied to a grid-connected micro-grid or when a fault is removed. Background technique [0002] Existing arc extinguishing methods include liquid or gas arc blowing, multi-fracture arc extinguishing, vacuum arc extinguishing, and special medium arc extinguishing. [0003] Now it is more common to use a multi-oil type arc extinguishing device, but this device consumes a lot of steel, oil, and volume; the oil-less type is easy to deteriorate, and often needs maintenance or oil replacement, and requires a set of oil treatment methods, which are not suitable for frequent operation; Compression The air-type structure is complex, the process and material requirements are high, the noise is loud when breaking, the maintenance cy...

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Problems solved by technology

[0003] Now it is more common to use multi-oil type arc extinguishing device, but this device consumes a lot of steel, oil, and volume; the oil-less type is easy to deteriorate, and often needs maintenance or oil change, and requires a set of oil treatment methods, so it is not suitable for frequent operation; Compression The air-type structure is complex, the process and material requirements are high, the noise is loud when breaking, and the maintenance cycle is long, requiring a set of compressed air devices; the special medium type has strict requirements for technology and sealing, and has high requirements for materials; the vacuum type interrupter process and materials High standard

Generally speaking, the cost of traditional arc extinguishing devices is high, the technical requirements are strict, and the maintenance costs are high

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