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Solar Cable Running Security, Is Efficient
- Jun 12, 2017 -

In recent years, the application of Solar Cable (PV) power generation is becoming more and more extensive and rapid development. In addition to the main equipment, such as PV modules, inverters and booster transformers, the PV cables are connected to the whole Profitability, operational safety, whether it is efficient, the same plays a vital role, the following photovoltaic power plants in the common use of cables and materials and the use of the environment to do a detailed introduction.

Cable according to the photovoltaic power plant system can be divided into DC cables and AC cables, according to the use and use of the environment are classified as follows:

1. DC cable

(1) Series cable between component and component.

(2) between the strings and their strings in the parallel distribution between the DC distribution box (confluence box).

(3) DC distribution box to the cable between the inverter.

The above cables are DC cable, outdoor laying more, need moisture, anti-sun, cold, heat, anti-ultraviolet, some special circumstances need anti-acid and other chemical substances.

2. AC cable

(1) the connection cable of the inverter to the step-up transformer.

(2) connection of the step-up transformer to the power distribution unit.

(3) Power distribution unit to the grid or the user's connection cable.

This part of the cable for the AC load cable, indoor environment laying more, in accordance with the general selection of power cable selection requirements.

3. Photovoltaic cable

Photovoltaic power plant in a large number of DC cable to be outdoor laying, environmental conditions are poor, the cable material should be based on anti-ultraviolet, ozone, severe temperature changes and chemical erosion may be. Ordinary material cables used in this environment for a long time will cause the cable sheath to be fragile and even break down the cable insulation. These conditions will directly damage the cable system, but also increase the risk of short-circuit cable, from the medium and long term, the occurrence of fire or personnel injury is also more likely to greatly affect the system life.

Therefore, the use of photovoltaic cables and components in photovoltaic power plants is very necessary. With the continuous development of photovoltaic industry, PV supporting parts market gradually formed, in terms of cable, has developed a variety of specifications of photovoltaic professional cable products. The recently developed electron beam cross-link cable, rated temperature of 120 ℃, can withstand adverse weather conditions and withstand mechanical shock. Another example is the RADOX cable is based on the international standard IEC216 developed a Solar Cable dedicated cable, in the outdoor environment, the service life is 8 times the rubber cable, PVC cable is 32 times. Photovoltaic cables and components not only have the best weather resistance, resistance to ultraviolet light and ozone erosion, but also can withstand a wider range of temperature changes (for example: from -40 to 125 ℃). In Europe, the technical staff through the test, the roof can be measured on the temperature of up to 100 ~ 110 ℃.

4. Cable conductor material

PV cables used in photovoltaic power plants in most cases for outdoor long-term work, subject to the constraints of construction conditions, cable connections using connectors. Cable conductor material can be divided into copper core and aluminum core. Copper core cable has better antioxidant capacity than aluminum, long life, good stability, low pressure drop and small power consumption characteristics; in the construction due to the copper core is flexible, allowing a small radius of curvature, so easy to turn, Easy to handle; and copper core anti-fatigue, repeated bending is not easy to break, so easy wiring; while the copper core of high mechanical strength,Solar Cable can withstand greater mechanical tension, to the construction of the laying of great convenience, but also for the mechanized construction to create the conditions The On the contrary aluminum core cable, due to the chemical properties of aluminum, the installation of joints prone to oxidation (electrochemical reaction), in particular, prone to creep phenomenon, easily lead to failure.

Therefore, the use of copper cables in the use of photovoltaic power plants, especially in the field of direct laying cable power supply, has a prominent advantage. Can reduce the accident rate is low, improve the reliability of power supply, construction operation and maintenance and so on. This is the current domestic cable power supply in the main use of copper cable is the reason.

5. Cable insulation sheath material

During the installation and operation of the PV plant, the cable may be routed in the air below the ground, in the weeds, on the sharp edges of the roof structure, and the cables may be subject to various external forces. If the cable jacket is not strong enough, the cable insulation will be damaged, thus affecting the life of the entire cable, or lead to short circuit, fire and personnel damage and other problems. Cable research and technology personnel found that the radiation cross-linked materials, radiation treatment than before a higher mechanical strength. The cross-link process changes the chemical structure of the cable insulation sheath material polymer,Solar Cable the fusible thermoplastic material is converted to a non-fusible elastomer material, and the cross-link radiation significantly improves the thermal properties, mechanical properties and thermal properties of the cable insulation Chemical properties.

DC circuit in the operation is often affected by a variety of adverse factors caused by grounding, making the system can not run properly. Such as extrusion, poor cable manufacturing, insulation material failure, low insulation properties, DC system insulation aging,Solar Cable or the presence of certain damage defects can cause grounding or become a grounding hazard. Another small outdoor animal intrusion or bite will also cause DC ground fault. So in this case the general use of armored, with anti-rat function jacket of the cable.