Wire and cable are important industrial products for a wide range of applications.. ZMS provides you with technical information on all types of wire and cable.
Coaxial cable is a cable that consists of a copper conductor, an isolation, a woven net and an outer cover. It can be used for transmission of analog and digital signals, including cable tv, long distance telephony, local area networks of computers, etc.
The quality of the coaxial cable has a major impact on the quality of the signal transmission. The following are ways to check the quality of coaxial cables.
The cables are divided into power cables, control wires, signal wires (communication cables)
Power cable and control cable are the common export cable type. Control cables belong to electrical equipment cables, and power cables are two of the five main cable categories.
1. The price is relatively high, from 2 a 5 times higher than that of ordinary flame retardant cable.
This is the same cross section, but mineral insulated cable (cable MICC) has a great capacity overload, so if it has the same current carrying capacity, the cross section is reduced and the cost is reduced.
Naturally, it will be reduced, and considering the cost of subsequent replacement and maintenance, in fact, the cost of both is similar, but the initial investment will be relatively large.
But the service life of mineral insulated cable is 50-100 years, BTTZ life is even more than 100 years. Cables typically last more than 20 years.
Power cable is the longest and most demanded cable product in power transmission, distribution and other essential electrical transfer lines.
Tubular water trees are water trees developed from insulating screens or conductive screens which are water trees from impurities or other defects in the insulation that develop radially towards the insulating screen and the conductive screen.
In recent years, A variety of electric cables fireproof, fire resistant and high temperature resistant, have achieved certain results.
These electrical cables do not spontaneously burn, have a certain flame retardant role, in fire they can hold a certain amount of energy, communication time.
But these cables also have a great shortage, since the cable in the fire will emit toxic gases and smoke. affecting vision, etc., in the evacuation and rescue of personnel to buy time and at the same time bring fatal injuries to personnel.
Electric conductivity — Most products require good electrical conductivity, and individual products require a certain range of resistance..
Performance Electrical isolation — insulation resistance, dielectric coefficient, dielectric loss, electrical resistance characteristics, etc.
transmission characteristics — refers to high frequency transmission characteristics, anti-interference characteristics, etc.
Experts thought that underground optical cables can intrude on people's privacy.
already in 1999, the us army. UU. He was aware of the special ability of fiber optics to control the behavior of people.
insulating post: is a special cable insulation control, an electrical material, which can play an important role in the overhead cables of transmission.
In the first days, post insulators were used primarily for electrical poles.
They gradually developed from the end of high-type high-voltage electrical cable connection towers with many suspended insulators., which were usually made of silica gel or ceramic to increase creepage distance. They are called insulators..
(1) buried directly in the ground, this is the most common and economical laying method.
(2) Laying in the cable trench to lay various cables.
In the case of DC cables and AC cables, the easiest way to tell them apart is by their application. DC cables are power cables used in DC transmission and distribution systems (direct current). AC wires, for his part, are used for AC (alternating current) feeding systems.
The structure of DC cable is basically the same as that of AC cable except that the electrical performance characteristics are different from those of AC..