High-voltage cable intermediate joint adopting gas or oil insulating medium

Abstract

The utility model discloses a high-voltage cable intermediate joint adopting a gas or oil insulating medium. The high-voltage cable intermediate joint comprises an intermediate joint body made of an insulating material and wire core tubes which are made of the insulating material and are detachably connected with two ends of the intermediate joint body, wherein a middle part of the middle joint body is hollow to form a sealed medium cabin, a medium injection port communicated with the medium cabin is arranged on the intermediate joint body, two ends of the intermediate joint body are connecting ends, connecting holes communicated with the medium cabin are arranged in the connecting ends of the intermediate joint body, a conductive rod is arranged in the middle of a medium cabin, and two ends of the conductive rod are fixed in the two connecting holes. The high-voltage cable intermediate joint is advantaged in that the high-voltage cable intermediate joint is good in universality, highin withstand voltage level and long in connection distance, maintenance efficiency is greatly improved, and maintenance cost is reduced.

Description

Technical field [0001] The invention relates to a high-voltage cable intermediate joint using gas or oil insulating medium. [0002] technical background [0003] With the acceleration of the integration process of integrated pipelines of urban power lines, urban planning for high-voltage overhead lines has been basically cancelled in urban areas. High-voltage cables have become a key part of power transmission, and the quality and reliability of high-voltage cable intermediate joints are particularly important. Usually [0004] Nowadays, the high-voltage cable is burnt out or exploded, so it needs to be connected. Generally, after the high-voltage cable is burned out or exploded, after the connection is reprocessed, the high-voltage cable at both ends will generally appear 1 The carbonization or insulation performance of about meters is not enough. There are generally two ways to solve it. First, if there is a residual wire at one end of the high-voltage cable, you can use the leng...

AI Technical Summary

Problems solved by technology

[0004] Now high-voltage cables sometimes burn out or explode, so they need to be connected. Generally, after the high-voltage cables are burnt out or exploded, after the connection is re-processed, there will generally be a gap between the two high-voltage cables. There are generally two ways to solve the carbonization or insufficient insulation performance of about one meter. First, if there is a surplus wire at one end of the high-voltage cable, you can use the length of the remaining wire to fill the gap, and then use the middle joint to connect. Second, if the high-voltage cable If both ends cannot be moved (such as high-voltage cables in urban rail transit, in order to save space, there are generally no remaining lines), so you can only find the nearest joint, cut off the entire high-voltage cable and reconnect it from the joint ,

[0005] Regardless of which of the above two methods is used, according to the requirements of the national standard, the high-voltage cable should minimize the number of intermediate joints, and after the cable is faulty and burnt out, the intercepted section needs to be connected with an additional cable or two intermediate joints, resulting in an increase in the failure rate.

According to field experience, the connection length between the two connectors should not be less than 200 meters for general 10kV-35kV high-voltage cables. Cut off at least the high-voltage cable of the corresponding length at the joint, and then re-lay a new high-voltage cable, so that the connection between the new high-voltage cable and the old high-voltage cable meets the national standard, and cutting off the high-voltage cable greatly increases the maintenance cost of the high-voltage cable, and the maintenance time is long. Great losses have been caused to the corresponding electricity-using residents or units

[0006] In addition, the intermediate joints of high-voltage cables are strictly distinguished according to the voltage level of the high-voltage cables and the type of each core. Therefore, if the existing high-voltage cables burn out or explode, it is necessary to find the corresponding intermediate joints, and the biggest problem that high-voltage cables are prone to is Discharge flashover, the existing silicone type cable head wraps the discharge flashover point, the problem is not easy to find, and if the discharge flashover is not handled in time, the high-voltage cable will burn out or explode

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