A high-voltage cable intermediate joint using gas or oil insulating medium

Abstract

A high-voltage cable intermediate joint using a gas or oil insulating medium, comprising an intermediate joint body made of insulating material and a wire core tube made of insulating material and detachably connected to both ends of the intermediate joint body, the intermediate joint body The middle part of the middle part is hollow to form a sealed medium compartment. The medium joint body is provided with a medium injection port communicating with the medium compartment. The two ends of the intermediate joint body are connecting ends. The hole is connected with the medium cabin, and the middle part of the medium cabin is provided with a conductive rod, and the two ends of the conductive rod are fixed in the two connection holes. This device has good versatility, high withstand voltage level, and long connection distance, which greatly improves the Maintenance efficiency reduces maintenance costs.

Description

technical field [0001] The invention relates to a middle joint of a high-voltage cable using a gas or oil insulating medium. [0002] technical background [0003] With the acceleration of the integration process of urban power line integrated pipelines, the urban planning of high-voltage overhead lines has been basically canceled in urban areas. High-voltage cables have become a key link in power transmission of power lines, and the quality and reliability of high-voltage cable intermediate joints are particularly important. [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 ...

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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