Electric cable accessory, is an essential component of electric transmission line which as the related products of cable. It have the effect of Connecting and transferring power, Once this link occurs problems, then will cause electricity interruption consequentially, affecting the social operation and causing unnecessary damage. Although the value of electric cable accessory is limited, but the effect is important. Then, how to choose the high quality electric cable accessory product?
①It is the primary principle to judge whether the cable accessory is good or not on quality. Mainly to considering that whether the distribution of electric field is reasonable, whether the measure of improving the distribution of electric field is proper, the electric strength of the material, dielectric loss and the insulation margin of the product, etc. At the same time, also need to consider the stability of electrical property, including the chemical and physical properties of cable accessory material and the stability of construction. For example whether the stress control material properties are stable, the compatibility of combine for the variety of materials, the effect of Cable insulation retraction for the electric field distribution of cable accessory and preventive measure, The stability of Interface performance, whether the stress cone is easy to transform, etc. Besides, also should consider the thermal properties of the cable accessory, like of the conductor linked contact resistance and stability, dielectric loss, The conduction of heat release, the effect of thermal expansion for Electrical performance and mechanical property of each component.
②Mechanical property. The terminal should have the enough capacity of bending resistance and shock resistance. The intermediate head should be able to bear determinate tension and have the measure to prevent damage by external force.
③Sealing property. The Seal moisture resistance can affect the electrical properties and service life directly. Whether it is reliable and stable for the hermetically-sealed construction of the terminal. Generally speaking, there should be a matched metal moisture-proof shell on the outside for the intermediate head, especially for the buried directly underground or using on the moist environment.
④ Processing property. The processing property is one of the important conditions for design and selection, the installation technology need as simple as possible to facilitate the construction, short construction period; The request for environment at the scene and the technological level is not very high; the Installation quality is easy to control and reliable, etc.
⑤roduct quality certification by manufacturer. The manufacturer provide the Rubber prefabricated parts, prefabricated stress cone, porcelain bushing, shell, impregnating agent and other parts when the prefabricated cable accessories delivery, they will assemble into the whole terminal or joint During site installation. Thus, The manufacturing quality and installation process of each part are directly related to the final quality of the product.