Non-exciting shunting switch with annular dynamic contact

Abstract

The invention relates to a non-excitation tapping switch used for a transformer, which comprises switch supports installed over and under the switch, and a main shaft installed between the two switch supports in a penetrating manner. Supporters are installed on the main shaft; columnar fixed contacts are installed on the circumference at intervals between the two switch supports; ring-shaped moving contacts are in bridge connection with two adjacent columnar fixed contacts; and the ring-shaped moving contacts are sleeved on the supporters and configured with radial sliding pins and a spring which are installed on the supporters. The non-excitation tapping switch is characterized in that one upper ring-shaped moving contact and one lower ring-shaped moving contact are configured on each sliding pin correspondingly; and rollers are arranged at tips of the radial sliding pins to be configured with the inner bores of the upper and the lower two ring-shaped moving contacts. The invention heightens the contact surfaces of the moving and the fixed contacts, improves the contact performance of the contacts, shortens the axial length of the switch or installs more moving contact rings along the identical axial length, and provides the switch with greater current-carrying capacity. Moreover, the switch has the advantages of tight and reasonable structure installment, small axial dimension of the switch, strong stiffness of the main shaft, and high reliability.

Description

technical field [0001] The invention relates to an off-excitation tap changer for a transformer. Background technique [0002] The existing off-excitation tap changer contacts include a fixed contact and a moving contact that bridges between two adjacent fixed contacts. The ring moving contact is in reliable contact with the fixed contact under the spring force. When shifting gears, under the action of the torque of the main shaft and the supporting member, the annular movable contact overcomes the pressure of the spring and runs along the surface of the columnar fixed contact from one side to the other side of the fixed contact to complete the shifting process. The annular movable contact is sleeved on the supporting piece connected with the main shaft, and configured with the radial sliding pin and the spring arranged on the supporting piece. The current-carrying capacity of the tap changer is mainly related to the size of the contact surface of the moving and fixed cont...

AI Technical Summary

Problems solved by technology

According to the above-mentioned existing contact structure, the setting of more moving contacts will not only increase the axial size of the tap changer, but also increase the structural difficulty of the switch, and reduce the stiffness of the switch spindle, affecting its reliable operation.

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