The effect of power cable accessories

by:Mings     2020-07-15
The effect of power cable accessories, power cable accessories in power cable and terminal, joint due to cable metal sheath and shield disconnect, cable ontology messy than makes the electric field distribution, axial stresses are present in electric cable terminals, thus need to use attachment cable to cable end in succession and barge, that is, a connection to the satisfaction of certain insulation and sealing needs. Cable conductor, insulation, shielding and protecting layer and so on four primary structure, as the cable line in the cable accessories part of cable terminal head, base joint, it is necessary to make the four layer structure of the cable have respectively, and excellent conductor end connection, reliable insulation, sealing well and satisfactory mechanical strength, guarantee the quality of cable terminals and cable connector, talent to ensure that the entire cable distribution network power supply reliability. Second, up to and including 35 kv medium voltage cable accessories category at the time, according to the main insulation molding skill, commonly used up to and including 35 kv cable terminal and base joint first can be divided into round package type, heat shrinkable type, cold type and prefabricated type and so on four kind of type products. There are also applied to a specific product planning of casting type and separated type cable accessories products. 2. 1 winding and cable accessories is refers to the insulation winding and cable accessories and shielding are using strip winding and cable accessories, selection of the stress control method of the stress cone or stress control with high dielectric constant, higher cost of construction personnel skill levels, construction skills are messy, has gradually been picking at the scene. 2. 2 use heat shrinkable cable accessories' elastic back effect of polymers with the principle of open declaration of all kinds of heat shrink tubing, branch heat shorten fabrication, such as the rain skirt and so on, according to the program is installed at the end of the processed cable or tapping, the heating, can make its shorten the hoops in the required position. Heat shrinkable cable accessories skills succinct, offer a low price, easy to protect. But there are also due to environment temperature change its inevitable existence 'respiration' using the shortening of life caused by the question, and then influence the power supply reliability. 2. 3 when engineering using cold shrink cable accessories shorten the tube and other cold shorten fabrication, with silicone rubber or epdm as primary material, after special formula composition, pre expansion on the spiral support core, device use, without any external heat source, only need to spread out the support core can shorten, and tight on the required position. Cold cable accessories need to be in the rules of use within the time limit, and the price is higher.
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