Terminal board for external on-load tap-changer and its manufacturing process

Abstract

The invention discloses a connection terminal board of an external-mounted on-load tap changer, which comprises a terminal board and a connection rod. The terminal board is made of epoxy resin, and the terminal board has grid-shaped reinforcing ribs. The connecting rod is embedded in the terminal board, and a boss is formed at the connection between the connecting rod and the terminal board. Among them, the terminal board, reinforcing rib and boss are formed by the epoxy resin automatic pressure gel process, and the epoxy resin is injected into the mold with the terminal rod. The invention also discloses a manufacturing process of the terminal board of the external on-load tap-changer, which includes: a terminal rod positioning step, placing the terminal rod equipped with the process kit into a mold for positioning and sealing; an epoxy resin injection step, to The epoxy resin automatic pressure gel process injects epoxy resin into the cavity of the mold; in the demolding step, the process kit on the mold and the terminal rod is removed to obtain a terminal board, and the terminal rod is embedded in the terminal board made of epoxy resin , a boss is formed at the connection, and a grid-shaped reinforcing rib is provided on the terminal board.

Description

technical field [0001] The present invention relates to the field of electric equipment, and more particularly, to a connection terminal of an external on-load tap changer. Background technique [0002] The plug-in on-load tap-changer exists as an independent plug-in and is suspended on the power equipment. The plug-in on-load tap-changer realizes the function of electrical connection through the terminals on the terminal board. Usually, the external on-load tap-changer is an independent sealed box with a vacuum inside the box. A terminal board is arranged on one of the side walls of the box, and the terminal board will occupy most of the area of ​​the side wall. Therefore, the terminal board should undertake the function of electrical connection on the one hand, and the function of the box wall on the other hand. [0003] As the wall of the box, the terminal board needs to meet the requirements of mechanical strength, sealing performance and insulation performance: in term...

AI Technical Summary

Problems solved by technology

For the epoxy laminated glass cloth board with openings, if it wants to achieve sufficient mechanical strength, it needs to have enough area, otherwise its mechanical structure cannot meet the strength requirements

However, increasing the area of ​​the terminal board will increase the volume of the entire plug-in on-load tap-changer, which is contrary to the trend of miniaturization of power equipment.

Due to the contradiction between the size of the terminal board and the mechanical strength, the terminal board made of the traditional epoxy laminated glass cloth board encounters difficulties in miniaturized power equipment

In addition, the aging problem of the sealing performance of the O-ring and the influence of the nut on the insulation also make the traditional structure of the terminal board have many performance limitations.

Images