Porous elbow type sleeve, manufacturing method thereof and pouring mold

Abstract

The invention specifically relates to a porous elbow type sleeve, a manufacturing method thereof and a pouring mold. The porous elbow type sleeve is characterized in that the front side of a shell is open, the lower end of the shell is open, a current-carrying assembly is arranged in the shell, a semi-conductive buffer layer is arranged on the inner surface of the shell and the surface of the current-carrying assembly, a conductive contact seat and a cable core socket which are cast or welded into a whole are arranged on the upper section of a conductive rod of the current-carrying assembly, the lower section of the conductive rod extends out of the shell, a conductive or semi-conductive capacitive screen is arranged outside the conductive rod, an integrated insulator wrapping the current-carrying assembly and the capacitive screen is arranged inside and outside the shell, the insulator is provided with an auxiliary jack and a cable terminal jack which are communicated with the conductive contact seat and the cable core socket, the capacitive screen and the integrated insulator form a slender capacitive insulating sleeve together, the tail end of the capacitive insulating sleeve is provided with a sealing compression ring, and the capacitive insulating sleeve and the shell form an elbow-shaped structure with a thick upper part and a thin lower part. The porous elbow type sleeve has the advantages of compact structure, low cost, good conductivity, good electrical property, high sealing reliability, high safety and wide application range.

Description

technical field [0001] The invention belongs to the technical field of high-voltage electrics, and in particular relates to a porous elbow bushing, a manufacturing method thereof and a casting mold. Background technique [0002] In traditional substations, when the transformer capacity is small and the current on the low-voltage side is small, cables are generally used for direct connection; with the increase of the main transformer capacity of the substation, a large cross-section low-voltage cable is directly used, and the cross-section of the cable core conductor will be reduced due to the skin effect. Severe amplification is very uneconomical, and the high-current cables are too bulky to meet the requirements of on-site installation. Therefore, copper bars or insulated copper pipes are usually used as busbar connections in previous projects. [0003] However, copper bars or insulated copper tubes as busbars also have their own shortcomings and defects. [0004] Copper b...

AI Technical Summary

Problems solved by technology

[0007] 1) In this technical solution, the conductive rod and the cable core socket are fixed and crimped by bolts, the electrical conductivity is poor, and the heat generated by the contact resistance is likely to cause insulation breakdown

[0008] 2) In this technical solution, there is no capacitive screen in the insulating sleeve part, the electric field distribution of the main insulation is uneven, the electrical performance is poor, and the safety performance of operation is low

[0009] 3) There is no auxiliary jack specially used for plugging in PT or surge arrester in this technical solution

The cross-section of the conductor used to plug in the PT or lightning arrester is relatively small. If the cable core socket is designed according to the waste of copper, and when the current is large, it is not enough for all the cable terminal sockets to distribute the cable load, and there are no redundant sockets. It is used to plug in PT or lightning arrester, it cannot monitor the voltage and protect the transformer, and it is easy to cause transformer insulation breakdown accidents

[0010] 4) In this technical solution, there is no sealing element at the end of the insulating sleeve, and the problem of air leakage or oil leakage is prone to occur due to thermal expansion and contraction caused by environmental changes or under strong mechanical vibration

Images