A double-position direct-acting switch

Abstract

A double-station direct-acting switch, including a power device, a base, and a direct-acting part slidably arranged left and right on the base, at least one moving end is fixedly arranged on the direct-acting part; each moving end includes an overtravel spring , The positioning guide seat and the left and right moving end contacts set opposite to each other. Two static ends form a contact group; the static end is fixed on the base, and the moving end is located between the two corresponding static ends. When the moving end slides left and right with the straight moving part, the top of the small end of the moving end contact The top is on the static end contact of the static end. The present invention can conveniently realize large opening distance of contacts, direct and reliable transmission, fast switching speed, small volume and low cost, and is suitable for narrow space and integrated design of complete equipment, especially suitable for being built into an oil-immersed transformer as a tap switch is used.

Description

technical field [0001] The invention relates to the technical field of power devices, in particular to a double-position direct-acting switch, in particular to a linear structure switch adopting a permanent magnet operating mechanism. Background technique [0002] The structure of the on-load tap changer in the prior art is complicated, the volume is large, and the cost is high. It is generally a rotating cage structure, and the transmission mechanism is generally a motor to drive the main shaft to rotate. Arcing occurs, long-term use causes poor contact of contacts, increased impurities in cooling oil, and decreased insulation. It is not suitable for large-scale promotion in 10kV power distribution occasions. [0003] Although the off-excitation voltage regulation (no-load voltage regulation) switch is relatively low in cost, it has some inherent disadvantages: one is that it must be operated in the state of no excitation of the transformer, and it needs a certain power out...

AI Technical Summary

Problems solved by technology

[0002] The structure of the on-load tap changer in the prior art is complicated, the volume is large, and the cost is high. It is generally a rotating cage structure, and the transmission mechanism is generally a motor to drive the main shaft to rotate. Arcing occurs, long-term use will cause poor contact of contacts, increase of impurities in cooling oil, and decrease of insulation, so it is not suitable for large-scale promotion in 10kV power distribution occasions

[0003] Although the off-excitation voltage regulation (no-load voltage regulation) switch is relatively low in cost, it has some inherent disadvantages: one is that it must be operated in the state of no excitation of the transformer, and it needs a certain power outage time to adjust, which interferes with normal production; the other is manual operation. Operation, the number of adjustments is limited, only periodic or seasonal adjustments can be made, and cannot be performed frequently, and the voltage fluctuations caused by daily peak and valley changes cannot be controlled, and the continuity and reliability of power supply cannot be well guaranteed

However, due to the disc-shaped structure of the tap changer, in order to improve the insulation level of the product, the distance between the contacts needs to be increased. To ensure the insulation, the volume of the switch must be increased, and the cost will increase a lot; and the lead wires of the transformer winding need to be connected around the disc-shaped switch. , less efficient

[0005] The existing patent (patent application number: 201310492317.7) provides a fast two-way three-state switching power switch device, which has the advantages of short switching time, small size, and reliable contact, but the transmission parts are more complicated, and the requirements for contact installation are high. The pressure structure is complex and the manufacturing cost is high

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