Fixed contact structure for non-excitation tap switch

Abstract

The invention discloses a fixed contact structure for a non-excitation tap switch. The fixed contact structure comprises a disc-shaped or strip-shaped switch body; at least one phase of fixed contacts is arranged on the switch body; each phase of fixed contacts comprises multiple first fixed contacts and a second fixed contact; the contact ends of various fixed contacts stretch into the cavity of the switch body and are configured with movable contacts; the wiring ends extend out of the switch body; the wiring ends of various fixed contacts are each provided with a lead hole; the aperture of the lead hole of the second fixed contact is greater than that of the lead holes of the first fixed contacts; the lead holes of the first fixed contacts are used for connecting the lead of this phase of coil; and the lead hole of the second fixed contact is used for sleeving the lead of this phase of coil and this phase of output lead. The aperture of the lead hole of the second fixed contact is greater than that of the leads holes of the first fixed contacts; two leads are connected and in cold press joint; another welding or press joint process is unnecessary; and thus, the processing technique becomes simple.

Description

technical field [0001] The invention relates to a static contact structure of an off-excitation tap changer. Background technique [0002] There are two types of non-excitation tap-changers for distribution transformers: disc structure and bar structure. Most of the static contact terminals are tubular structures, and the connection with the tap lead wire of the transformer is cold crimping, and the lead wires of each terminal have the same diameter. , and are respectively connected with a tap lead wire, the structure is simple, the use is convenient and reliable. However, when this type of switch is used for voltage regulation at the end of the coil, the lead wire at the end of one phase coil must be connected with the end or head lead wire of the other phase coil. One lead wire is cold-pressed. At this time, one more lead wire needs to be separated from the end lead of the transformer coil, welded or crimped to the end (or head) static contact, and then connected to anoth...

AI Technical Summary

Problems solved by technology

However, when this type of switch is used for voltage regulation at the end of the coil, the lead wire at the end of one phase coil must be connected with the end or head lead wire of the other phase coil. One lead wire is cold-pressed. At this time, one more lead wire needs to be separated from the end lead of the transformer coil, welded or crimped to the end (or head) static contact, and then connected to another phase coil or led to the bushing , so that there is one more welding or crimping process step for the connection between the static contact at the end and the lead wire, which makes the manufacturing process of the transformer lead wire inconvenient

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