Prefabricated dry-type capacity type cable terminal

Abstract

The invention is related to cable end of cross-linked polyethylene insulated cable in use for voltage class higher than 66kV. The invention developed is to solve difficulties in existed techniques for wrapping and detecting main insulation of cable end in dry type capacitance mode. The invention includes connection terminal, grading shield and conduction pole, insulation in capacitance mode and spacer flange etc. Insulation in capacitance mode is inside tube of synthetic rubber sheathed by rigid insulating cylinder wrapped by plastic insulation tape. Spacer flange is installed on rigid insulating cylinder fixedly. The grading shield connected to the spacer flange is installed on conduction pole. Innermost shield of insulation is equipotential connected to grading shield, conduction pole and spacer flange. Insulating sheath is outside insulation. Advantages are: dry production, no oil, no gas, free from maintenance basically, fabricating and testing steps in factory.

Description

technical field [0001] The invention belongs to the field of high-voltage electrical appliances, in particular to a cross-linked polyethylene insulated cable terminal for voltage levels of 66kV and above. Background technique [0002] At present, there are two types of cable terminals in high-voltage power systems with a voltage level of 66kV and above, one is the cable terminal using the stress cone structure, and the other is the cable terminal using the capacitive structure. Among them, the former type of cable terminal occupies the mainstream in the power system, and the latter type of cable terminal also occupies a certain market in the power system. The cable terminal with stress cone structure has some disadvantages: (1) high cost; (2) once the stress cone is damaged, cable breakdown will occur, causing the line to be paralyzed, causing fire and explosion; (3) easy to seep oil, The maintenance workload is heavy. Now there is a kind of dry capacitive cable terminal o...

AI Technical Summary

Problems solved by technology

The cable terminal with stress cone structure has some disadvantages: (1) high cost; (2) once the stress cone is damaged, cable breakdown will occur, causing the line to be paralyzed, causing fire and explosion; (3) easy to seep oil, heavy maintenance workload

But this kind of cable terminal also has disadvantages: (1) Since the plastic insulating tape is directly wrapped on the cable XLPE insulation, the bending resistance of the cable terminal is not good, and the capacitive insulation is easily damaged; (2) the main insulation package The production needs to be carried out on the construction site, and the working environment is poor, so it cannot be packaged by machine tools in the factory, and the product quality is difficult to guarantee; (3) After the main insulation is packaged on site, it is difficult to detect; (4) The cable terminal can only be used for air In, but can not be used in transformer oil or GIS combined electrical appliances

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