How to distinguish the quality of photovoltaic line?

Solar energy technology will become one of the green energy technologies in the future. Solar energy cable is becoming widely used in China. In addition to the rapid development of government-supported photovoltaic power plants, private investors are also actively building plants and plan to put them into production and sell them globally. Solar modules. Many countries are still in the learning stage. There is no doubt that in order to obtain the best profits, companies in the industry need to learn from countries and companies that have years of experience in solar energy applications. The construction of cost-effective and profitable photovoltaic power plants represents the most important goal and core competitiveness of all solar manufacturers.


How to choose fiber optic cable for us?
1. Outer: Indoor optical cables generally use polyvinyl or flame-retardant polyvinyl. The appearance should be smooth, bright, flexible and easy to peel off. The outer skin of poor quality optical fiber cable is not smooth and easy to adhere to the tight sleeve and aramid inside.

The PE sheath of the outdoor optical cable should be made of high-quality black polyethylene. After the cable is formed, the outer skin is smooth, bright, uniform in thickness, and free of small bubbles. The outer skin of inferior fiber optic cable is generally produced with recycled materials, which can save a lot of cost. The outer skin of this kind of fiber optic cable is not smooth. Because there are many impurities in the raw material, the outer skin of the made fiber optic cable has many very small pits. water.


2. Optical fiber: Regular optical fiber cable manufacturers generally use grade A cores from large factories, and some low-cost and inferior optical cables usually use grade C, grade D optical fibers and smuggled optical fibers from unknown sources. These optical fibers take a long time to leave the factory due to their complex sources. It is often damp and discolored, and single-mode fibers are often mixed in multimode fibers. Generally, small factories lack the necessary testing equipment and cannot judge the quality of the fiber. Because such optical fibers cannot be distinguished by the naked eye, the common problems encountered in construction are: narrow bandwidth and short transmission distance; uneven thickness and cannot be connected to the pigtail; the optical fiber lacks flexibility and breaks when it is bent.

3. Reinforced steel wire: The steel wire of the outdoor optical cable of the regular manufacturer is phosphated, and the surface is gray. Such steel wire does not increase hydrogen loss, rust, and has high strength after being cabled. Inferior fiber optic cables are generally replaced by thin iron or aluminum wires. The identification method is easy-it is white in appearance and can be bent at will when it is pinched in the hand. The optical fiber cable produced with such steel wire has a large hydrogen loss, and after a long time, the two ends of the hanging optical fiber box will rust and break.

4. Steel armor: regular production companies use double-sided brushed anti-corrosion paint longitudinally wrapped pattern steel strips, inferior optical cables use ordinary iron sheet, usually only one side of the anti-rust treatment.


5. Loose tube: The loose tube of the optical fiber in the optical cable should be made of PBT material, which has high strength, no deformation and anti-aging. Inferior fiber optic cables generally use PVC as the sleeve. The outer diameter of such a sleeve is very thin, and it is flattened by pinching it with the hand. It is a bit like a straw for drinking.

6. Fiber paste: The fiber paste in the outdoor optical cable can prevent the fiber from oxidizing. Due to moisture ingress and dampness, the fiber paste used in inferior fibers is very small, which seriously affects the life of the fiber.


7. Aramid: Also known as Kevlar, it is a high-strength chemical fiber that is currently used most in the military industry. Military helmets and bulletproof vests are produced from this material. At present, only DuPont and the Dutch Akzo can produce them, and the price is about 300,000 tons. Indoor optical cables and power overhead optical cables (ADSS) both use aramid yarns as reinforcements. Because aramid costs are relatively high, inferior indoor optical cables generally have a very thin outer diameter, which can save costs by using fewer strands of aramid. Such optical cables are easily broken when they are threaded through the tube. Because ADSS optical cable determines the amount of aramid fiber used in the optical cable according to the span and wind speed per second, it is generally not afraid to cut corners.

Five Main Types of Cable

1.What are the types of cable?
The wire products used to transmit electric (magnetic) energy, information and realize the conversion of electromagnetic energy are collectively referred to as wires and cables. According to different purposes, wires and cables can be divided into five categories:

(1). Bare conductors: products with only conductors without insulation, such as steel core aluminum stranded wire(ACSR cable), aluminum stranded wire, and copper stranded wire. Products are mainly used in suburbs, rural areas, user main lines, switch cabinets, etc.

(2). Winding wire (magnet wire): In the form of a winding, the magnetic line of force is cut in a magnetic field to induce current, or a wire that generates a magnetic field with current. It is mainly used in various motors, instruments and meters. Such as enameled wire.

(3). Power cables: Cable products used to transmit and distribute high-power electrical energy in the backbone of the power system, such as cross-linked polyethylene (xlpe) insulated power cables. The products are mainly used in the transmission of strong electric energy in power generation, distribution, transmission, transformation, and power supply lines, with large current (tens of amperes to several thousand amperes) and high voltage (220V to 500kV and above).

(4). Communication cables and optical cables: cables and optical cables that transmit telephone, telegraph, television, radio, fax, data and other telecommunication information.

(5). Wires and cables for electrical equipment: Wires and cables used to directly transmit electrical energy from the power distribution point of the power system to the power connection lines of various electrical equipment and appliances. Such as control cables, wiring wires, etc.

2. What are the application of Cable?
Power system: The wire and cable products used in the power system mainly include overhead bare wires, busbars (bus bars), power cables (plastic cables, oil-paper cables (basically replaced by plastic power cables), rubber-sheathed cables, overhead insulated cables), Branch cables, electromagnetic wires, electrical equipment wires and cables for power equipment, etc.
Information transmission system: The wires and cables used in the information transmission system mainly include local telephone cables, television cables, electronic cables, radio frequency cables, optical cables, data cables, electromagnetic wires, power communications or other composite cables.
Mechanical equipment, instrumentation system: Except for overhead bare wires, almost all other products have applications, but mainly power cables, electromagnetic wires, data cables, instrument cables, etc.

3. What is the basic structure of wire and cable?

Conductor: An object that conducts current. The specifications of wires and cables are expressed by the cross-section of the conductor.
Insulation:
The insulating material is wrapped on the outside of the conductor in different thicknesses according to the requirements of its withstand voltage.
Protective layer: the part that protects the cable.