Classification of communication cablesCommunication wire and cable are used in the communication system on the line at all levels of the many varieties of specifications, and classification methods are many.The installation and operating conditions can be divided into overhead cables, messenger cables, cables, submarine cables directly...
The reason for the increase in transmission impedance of braided outer conductors with increasing frequencyThere are mainly the following reasons:
1, weaving conductor inductance.
2, pore cause braid the direct coupling between inside and outside.
3, usually woven layer is the lowest resistance path along the wire, it has to do with the distan...
Coaxial cable outer conductor structure1, Coaxial cable weaving outer conductor: commonly used for the flexible cable of the radio frequency form. The advantage is relatively soft, and can be used for small-size cable and solid insulation, and air-insulated cable; the Defect is poor electrical properties, greater attenuation.
2, tubular co...
The general requirements of power cable transport(1) the power cable is wrapped around the cable cast on transportation, storage and installation. 30 m below the short section of the cable, Can also according to no less than the minimum bending radius of the cable to allow roll into a circle, and at least 4 bundles tight after handling. More cable for w...
Meaning and test methods for testing the tensile strength and elongation of bare wireFor bare wire, tensile strength and elongation are one of the important mechanical and bare wire conductor products performance, is the relationship between product quality and can bear the external force size of the important symbol. Tensile strength, and elon...
Scope of application of protective earthingThe metal parts of electrical equipment shall be under the protection of zero or protection grounding measures.
(1) motors, transformers, electrical appliances, lighting appliances, portable and mobile electric appliances such as the base and the shell;
(2) electrical equipment transmission devi...
Around the envelope, the difference between winding and wireAround covered wire is made of silk, polyester yarn, fiberglass, insulating paper, or synthetic resin film closely around the package on the conducting wire core, forming the insulating layer. There is also integrated contracting again on the enameled wire insulation layer. In addition to...
Overhead conductors of corrosion and corrosion mechanismVarious wires of overhead power lines, especially set up wires in coastal and industrial areas, through the atmosphere, for a long time. Wind and rain, and the erosion of salt fog, are very susceptible to corrosion. Due to the chloride ion radius being very small, the atmosphere is f...
The influence factors of overhead conductors carrying capacity and carrying capacity testFor overhead conductors carrying capacity is one of the essential parameters of power line calculation of transmission capacity. Wire carrying capacity value is too high, and the conductor fever is serious, leading to the strength of the conduct...
The purpose enameled wire softening breakdown testThe instrument is detecting the paint enameled wire speed temperature control and the method of constant temperature test instrument, one of the instruments is set up and can be used to test the 3.00 mm and the following paint Taoyuan line under thermal state film after softening insulation perfor...
