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Cable Accessories Development Of
Jul 01, 2017

High-voltage cable accessories are developed by the low-pressure accessories. Therefore, 110kV and above cross-linked polyethylene insulated cable terminal and the middle of the varieties, and 35kV and below the cable terminal and the middle of the similar varieties.

The main varieties of XLPE cable terminals are outdoor terminal, GIS terminal (installed in the closed combination of electrical appliances, Cable Accessories also known as SF6 gas terminal) and transformer terminal (installed in the transformer tank, also known as oil terminal).

At present, the external 110 ~ 345kV voltage level for the cross-linked cable terminal main type for the prefabricated rubber stress cone terminal (referred to as prefabricated terminal), Cable Accessories higher voltage level of the cross-linked cable terminal using silicone oil impregnated film capacitor cone terminal (referred to as the capacitor cone terminal ). Early in the 110kV voltage level has been used around the other types of terminals, and now has been rarely used.

110kV and above cross-linked cable intermediate connector, Cable Accessories according to his function, to the cable metal sheath, grounding shield and insulation shield on the electrical disconnect or continuous into insulation joints and through joints. (TJ), molded molded joint (TMJ), Cable Accessories extruded molded joint (EMJ), prefabricated connector (PJ), etc., in the case of insulated connections or through fittings, Types of.

Outdoor terminal: A terminal used in situations that are exposed to direct sunlight or exposed to a climatic environment or both.

GIS terminal: installed in the gas-insulated switchgear inside the device to SF6 gas-insulated cable terminal.

Oil-immersed Termination: A cable terminating in a liquid-insulated part of an oil-immersed transformer tank with an insulating oil insulation.

Straight connector: Connect two cables to form a continuous circuit attachment for direct grounding of the cable connection.

Insulated connector: the metal sleeve of the cable, Cable Accessories the grounding metal shield and insulation shielded in the electrical disconnect the connector for the cable line metal jacket cross-interconnection occasions, reduce the loss of the sheath.

The overall prefabricated rubber insulation: set the stress cone, umbrella skirt and insulation in one, as a whole prefabricated.

Conventional prefabricated terminals are internally insulated using a prefabricated stress cone to control the electric field, and the outer insulation is a porcelain sleeve (or epoxy casing), Cable Accessories as shown in Fig. Between the casing and the stress cone are generally filled with silicone oil or polybutylene, polyisobutylene and the like insulating oil. At the factory, the manufacturer provides parts such as rubber prefabricated stress cone, Cable Accessories porcelain sleeve, insulating oil and other parts, and then assembled into the terminal

A set of mechanical spring means is added to the stress cone to maintain a constant stress at the interface between the stress cone and the cable, Cable Accessories in response to changes in the interfacial pressure that may be caused by the aging of the rubber stress cone under high and thermal fields ( relaxation).

This structure also has a very important feature, its stress cone and impregnated oil is basically isolated, Cable Accessories thus overcoming the possibility of stress cone material swelling. Japan and South Korea's cable manufacturers have adopted this structure. China's Changsha, Cable Accessories Hunan Cable Accessories company's products are this structure.

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