Cable head connection method for tap switch

Abstract

The invention provides a cable head connection method for a tap switch. By means of the method, an extraordinary threaded joint method is adopted to replace an existing welding connection method for connection between the starting end of a cable with the tail end connected with a coil tap of a transformer and a fixed contact of the tap switch. The supernormal threaded connection method is characterized in that a common thread connection mode is upgraded to an extraordinary tapered thread connection mode and upgraded to a supernormal modified airtight thread connection mode again. The method has the advantages that the split combination process in the tapered thread connection mode is adopted for cable head connection, operation is easy and smooth, an original welding connection mode is omitted, and the connection combination process is high in operation difficulty and unsmooth in operation; goffered paper and white cloth tape are wound mechanically instead of manually, so that the efficiency is improved by more than 20 times; the process that the starting end of the cable is subjected to chemical silvering is omitted, so no residual acid is left at the starting end of the cable, and zero-pollution to transformer oil is achieved.

Description

technical field [0001] The invention relates to the connection method between the transformer and its important component—the tap changer for adjusting its voltage in the field of power transmission and transformation. Between the use of extraordinary threaded connection instead of today's welded connection method. technical background [0002] According to investigations, at present, whether it is a company that mainly produces off-excitation tap-changers or an enterprise that also manufactures off-excitation tap-changers, the cable head connection of the tap-changer still adopts welding, that is, the fixed contact and the beginning of the connecting cable. Soldering fixation, such as figure 1 As shown, there are the following deficiencies: [0003] (1) Since the fixed contact of the high-voltage and high-current tap-changer is hard and large, and the cable is thick and long, it is difficult to fit into the tubular tap-changer, drum-shaped tap-changer, and cylindrical tap...

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Problems solved by technology

[0004] (2) Since the cable wire is wrapped with crepe paper and the insulation layer of the white cloth tape, the diameter of the outer circle is much thicker than the small hole of the insulator (housing) through which the cable wire passes, so the winding work can only be done after the fixed contact is assembled. The outside of the tap changer is clumsy and manual labor, which takes a long time, is inefficient, and is not standardized, which is tormenting people!

[0005] (3) Since the fixed contacts and cables need to be welded with silver as a whole, it is difficult to remove the residual acid after the connecting end of the cables and fixed contacts is silver-plated by pickling process. Over time, black oxides are produced on the surface, and the composition is complex and harmful to insulation. , become the pollution source of transformer oil

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