A capacitive cable terminal not filled with insulating medium

Abstract

A capacitance-type cable terminal without a filled insulation medium, which falls within the field of high-voltage electrical appliances, and mainly solves the technical difficulty of an insulation sleeve of a cable terminal being not filled with an insulation medium. The capacitance-type cable terminal comprises: a high-voltage equipotential cabin (8) which is embedded into an inner surface of a capacitance-type insulation sleeve (5) and formed by a high-voltage equipotential screen (6) extending from an upper flange (3) to the top surface of a stress jacket (2) and a cable conducting core (7), wherein the electric field intensity in the cabin is zero, without the need to fill an insulation medium. A group of capacitance screens (9) which are insulated to one another is also embedded into an insulation layer of the capacitance-type insulation sleeve (5), and a grounding screen (10) on the outermost layer is connected to a lower flange (4). The cable terminal is not filled with the insulation medium, thereby solving the difficulties of oil leakage and gas leakage, and achieving energy saving, environmental protection, security and reliability. Since a group of capacitance screens is arranged in an insulation sleeve, the insulation level and service life of the cable terminal is increased and prolonged.

Description

technical field [0001] A capacitive cable terminal not filled with an insulating medium belongs to the field of high-voltage electrical appliances, and can be used as a cable terminal for extruded solid insulation outdoors, indoors, and GIS. Background technique [0002] The general cable terminal includes a stress cone to improve the stress concentration at the root of the cable terminal, an insulating sleeve (maybe a porcelain sleeve or a resin sleeve), and an insulating medium (liquid or gas) that fills the inner space. The function of the stress cone is to improve the electric field strength at the root of the cable and reduce stress concentration; the function of the insulating sleeve is to contain the stress cone and the insulating medium, and support the cable terminal head and increase the external creepage distance. The upper method of the end of the insulating sleeve The flange is fixed at the end of the cable conductor, and the lower flange at the root of the insu...

AI Technical Summary

Problems solved by technology

However, because the end of the insulating sleeve is at high potential, the root is at ground potential, and the electric field strength at each point inside is high, it is easy to generate discharge (including breakdown, flashover or partial discharge) in the air gap between the sleeve and the cable. And the insulation is damaged, so it must be filled with insulating medium to ensure the insulation strength and reduce the partial discharge below the standard, so as to ensure safety in long-term operation

[0003] It is very troublesome to fill the insulating medium when installing the cable terminal on site, not only to ensure a clean environment, but also to use more equipment and more complicated processes, and the insulating medium may cause leakage after operation. The oil may cause a fire, and if the SF6 gas leaks after operation, it may also cause environmental pollution or personnel poisoning, or even cause an explosion, threatening personal safety and equipment safety

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