Pressure-operated load switch for gas-insulated ring main unit

Abstract

The invention discloses a pressure-operated load switch for a gas-insulated ring main unit. The pressure-operated load switch comprises a support, an upper support plate, a lower support plate, support insulators, an insulating cylinder, a fixed contact, a nozzle, a movable contact, a compressor sleeve, a conductive tube, a contact seat, a main shaft, a crank arm system and a guide rod, wherein a first high-voltage shielding case and a second high-voltage shielding case are arranged outside the insulating cylinder; the internal structure of the insulating cylinder forms a load switch arc-extinguishing chamber; the load switch arc-extinguishing chamber is fixed on the support through the support insulators and the upper support plate; the guide rod is fixed on the support through the lower support plate and the support insulator; the fixed contact and the movable contact adopt arc striking contact and conductive contact all-in-one structures; and airvents are formed on the fixed contact. The pressure-operated load switch has the advantages of small size, simple contact system, strong on / off capability, high action stability and long service life.

Description

technical field [0001] The invention relates to a compressed air load switch, in particular to a compressed air load switch for a gas-insulated ring network cabinet. Background technique [0002] Gas-insulated ring network cabinets are widely used in medium and high-voltage power transmission and distribution networks for power distribution and line protection; load switches are the main components of gas-insulated ring network cabinets, installed in gas-insulated ring network cabinets, and used to close and short-circuit The current and breaking load current usually adopt arc extinguishing structures such as compressed air type and metal deionized grid type; the compressed air load switch adopts the principle of compressed air type, and generates high-speed airflow through compressed gas to cool and extinguish the arc. This structure has strong arc extinguishing ability. has been more commonly used. [0003] The dynamic and static contacts of the existing compressed air lo...

AI Technical Summary

Problems solved by technology

[0004] The compressed gas chamber of the existing compressed gas load switch is set in the conductive tube, and the conductive tube is small in size due to the space limitation of the insulating cylinder, so the pressure of the compressed gas chamber is insufficient, and the arc extinguishing ability is limited; the dynamic and static contacts are equipped with arc contacts. The structure of the contact system is complicated and the product cost is high; the arc extinguishing chamber of the load switch is sealed in the insulating cylinder, the insulating gas cannot be renewed after breaking, and the service life is greatly reduced; the electric field distribution of the fracture of the arc extinguishing chamber of the load switch Unevenness greatly limits the insulation performance of the load switch and affects the application and development of the load switch to a higher rated voltage level

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