Insulation protection arc suppression type drop fuse switch

Abstract

The invention relates to an insulation protection arc-extinguishing drop-out fuse switch which comprises a drop-out fuse switch body (1) and a fuse tube (2). The upper end of the insulator (11) of the drop-out fuse switch body (1) is provided with a power-supply-side static contact insulation protection rack (14), and the lower end is provided with a load-side static contact insulation protection rack (19). The upper end of the insulation tube (21) of the fuse tube (2) is provided with a power-supply-side moving contact insulation protection rack (25), and the lower end is provided with a load-side moving contact insulation protection rack (26). The fixed insulator (27) of the load-side moving contact insulation protection rack (26) is fixedly mounted at the lower end of the insulation tube (21). A movable insulator (28) is hinged with the fixed insulator (27). The insulation protection arc-extinguishing drop-out fuse switch has advantages of high insulation protection performance, effective prevention for grounding and interphase shortcircuit or human electric shock accident, automatic fuse tube falling in fusing break of the fuse, effective prevention for fuse tube damage caused by continuous electric arc generation in the fuse tube, no electric charge of the fuse tube in detachment of the fuse tube, and low danger in operation.

Description

technical field [0001] The invention relates to electrical equipment, in particular to a drop-out fuse switch. Background technique [0002] As a commonly used electric device, the drop-out fuse switch has been used for 60 years. It has been widely used due to its advantages of simple operation and convenient replacement of fuses. However, the insulation protection of the traditional drop switch is not good. The exposed parts of the insulator and the upper and lower ends of the fuse tube are conductors. Urban high-altitude parabolic objects and urban garden trees may touch the conductor of the drop switch in windy and rainy weather, resulting in grounding and phase-to-phase short circuit. or personal electric shock accident. When the drop switch operator of the existing structure closes the switch, it is easy for the moving contact on the power supply side to be inaccurately aligned with the static contact on the power supply side, resulting in incomplete closing, which wil...

AI Technical Summary

Problems solved by technology

However, the insulation protection of the traditional drop switch is not good. The exposed parts of the insulator and the upper and lower ends of the fuse tube are conductors. Urban high-altitude parabolic objects and urban garden trees may touch the conductor of the drop switch in windy and rainy weather, resulting in grounding and phase-to-phase short circuit. or personal electric shock accident

When the drop switch operator of the existing structure closes the switch, it is easy for the moving contact on the power supply side to be inaccurately aligned with the static contact on the power supply side, resulting in incomplete closing, which will cause arcing and cause the drop switch to be burned or burned out, and the drop switch is replaced. Time-consuming and labor-intensive, it will also cause long-term power outages in large-scale power supply areas, affecting the normal power supply of residents or power consumers

This kind of drop switch is also prone to the phenomenon that the fuse is blown but the fuse tube does not drop, and it will also cause the arc to burn continuously in the fuse tube and burn out the fuse tube, causing unnecessary losses.

Because the insulator and the lower part of the fuse tube of the existing drop switch are made of conductive materials, the static contact on the load side and the moving contact on the load side are always connected before the fuse tube is removed. The static contact on the load side is charged, which is equal to the disconnection of the fuse tube when it is charged, which increases the risk of operation

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