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.
The power transmission by high-temperature superconductors is one of the most revolutionary engineering technologies in the energy industry today.
The term high-temperature superconductivity refers to the use of superconducting materials in an environment of liquid nitrogen a -200 Celsius degrees, near absolute zero.
In this case, the resistance of the energy transfer medium is close to zero and energy transfer losses are practically non-existent.
as a natural phenomenon, lightning is generated for various reasons. During the frequent annual lightning season, power lines can be significantly affected.
Las 10KV overhead lines are subject to direct and induced lightning, that can generate very high voltages and cause surges in overhead cables.
The lightning surge is usually much higher than the allowable voltage of the line. The lack of protection measures against lightning can easily cause it to strike the insulation., which can lead to fractures at weak points. Serious damage to electrical equipment leads to unnecessary safety accidents.
PVC cable material is manufactured from polyvinyl chloride as the base resin., to which stabilizers are added, lubricants and inorganic fillers. It is prepared by mixing, kneading and extruding.
Although this material has mediocre properties and is not environmentally friendly enough, it is less expensive and the process is simpler. So, PVC remains one of the most widely used cable materials.
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.