An oil-immersed gas-insulated tap changer

Abstract

The invention discloses an oil-immersed gas-insulated tap changer, comprising a switching switch and a tap selector, wherein the switching switch is on the top, the tap selector is on the bottom and the middle is mechanically connected, and is integrally placed into a transformer oil tank from a flange hole of an upper cover of the transformer; the tap selector is of a cage structure, and has a plurality of wiring terminals on it, which are used for connecting with the transformer coil taps and directly immersed in the insulation medium of the transformer oil tank. The tap changer is characterized in that the switching switch comprises a cylindrical sealing gas chamber and a switching core sealed in the cylindrical sealing gas chamber, wherein the cylindrical sealing gas chamber is filledwith an insulating gas, and the switching core of the switching switch uses the insulating gas as an insulating medium.

Description

technical field [0001] The invention relates to the technical field of tap changers, in particular to an oil-immersed gas-insulated tap changer. Background technique [0002] The tap changer is to achieve the purpose of changing the output voltage of the transformer by changing the winding taps connected to the transformer and changing the turns ratio of the primary and secondary windings of the transformer when the transformer is loaded or unloaded (that is, without power failure or power failure). . [0003] In the traditional technology, the usual tap changer includes a diverter switch and a tap selector; the diverter switch is on the top, the tap selector is on the bottom, and the middle is mechanically connected, and the whole is inserted into the transformer oil tank from the flange hole of the transformer upper cover. The diverter switch is usually a cylindrical member, sealed in its own separate cylindrical oil chamber, and the tap selector is usually a cage structu...

AI Technical Summary

Problems solved by technology

[0004] During the operation, it was found that once the diverter switch fails, the fault current or arc generated will burn in the transformer oil, and the combustion will cause the pressure in the cylindrical oil chamber to be too high and cause an explosion, making the accident too large and endangering the transformer and other equipment in the substation safe operation of

In addition, during daily operation, it is necessary to pay attention to and analyze the transformer oil in the cylindrical oil chamber, which makes the user's daily maintenance workload very heavy

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