Solar Power (PV) is widely used and developing rapidly. In the construction of PV power stations, in addition to the main equipment such as PV modules, inverters and step-up transformers, the photovoltaic cable materials that are connected together also play a vital role in the overall profitability, operational safety and efficiency of the photovoltaic power station, the following on the common photovoltaic power station cable and material use and use of the environment to do a detailed introduction.
According to the system of PV power station, cables can be divided into DC cable and AC cable. According to the usage and environment, they are classified as follows:
According to the system of PV power station, cables can be divided into DC cable and AC cable. According to the usage and environment, they are classified as follows:
01
DC cable
(1) a cable in series between assemblies.
(2) parallel cables between clusters and between clusters to DC distribution box (bus box) .
(3) cable between DC distribution box and inverter.
The above cables are DC cables, outdoor laying more, need moisture, anti-exposure, cold, heat, anti-uv, some special circumstances also need anti-acid and alkali and other chemicals.
(2) parallel cables between clusters and between clusters to DC distribution box (bus box) .
(3) cable between DC distribution box and inverter.
The above cables are DC cables, outdoor laying more, need moisture, anti-exposure, cold, heat, anti-uv, some special circumstances also need anti-acid and alkali and other chemicals.
02
AC cable
(1) connection cable from inverter to step-up transformer.
(2) connection cable from booster transformer to distribution unit.
(3) the connection cable from the distribution unit to the power grid or to the customer.
This part of cable for AC load cable, indoor environment laid more, in accordance with the general power cable selection requirements.
(2) connection cable from booster transformer to distribution unit.
(3) the connection cable from the distribution unit to the power grid or to the customer.
This part of cable for AC load cable, indoor environment laid more, in accordance with the general power cable selection requirements.
03
PV cable
A large number of direct current cables in photovoltaic power stations need to be laid outdoors, and the material of the cables should be determined according to the anti-ultraviolet, ozone, drastic temperature change and chemical erosion. Common material cable in this kind of environment long-term use, will cause the cable sheath fragile, even will decompose the cable insulation layer. These conditions will directly damage the cable system, but also increase the risk of cable short-circuit, in the medium and long term, the possibility of fire or personal injury is higher, greatly affecting the service life of the system.
Therefore, it is necessary to use the special cables and components in the photovoltaic power station. With the continuous development of the photovoltaic industry, the market for photovoltaic components has gradually formed. As far as the cable is concerned, a variety of specifications of photovoltaic cable products have been developed. Recently developed electron beam cross-link cable, rated temperature of 120 °C, can withstand harsh weather and mechanical impact. For example, RADOX cable is a kind of solar energy cable developed according to international standard IEC216. In outdoor environment, the service life is 8 times of rubber cable and 32 times of PVC cable. PV special cables and components not only have the best weather resistance, UV and ozone resistance, but also can withstand a wider range of temperature changes (for example, from-40 to 125 °C) . In Europe, technicians can measure temperatures as high as 100-110 °C on rooftops.
Therefore, it is necessary to use the special cables and components in the photovoltaic power station. With the continuous development of the photovoltaic industry, the market for photovoltaic components has gradually formed. As far as the cable is concerned, a variety of specifications of photovoltaic cable products have been developed. Recently developed electron beam cross-link cable, rated temperature of 120 °C, can withstand harsh weather and mechanical impact. For example, RADOX cable is a kind of solar energy cable developed according to international standard IEC216. In outdoor environment, the service life is 8 times of rubber cable and 32 times of PVC cable. PV special cables and components not only have the best weather resistance, UV and ozone resistance, but also can withstand a wider range of temperature changes (for example, from-40 to 125 °C) . In Europe, technicians can measure temperatures as high as 100-110 °C on rooftops.
04
Cable conductor material
Cable conductor material
Most of the direct current cables used in PV power stations are outdoor long-term work, which is limited by the construction conditions. Cable conductor material can be divided into copper core and aluminum core. The copper-core cable has the advantages of better oxidation resistance, longer service life, better stability, less voltage drop and less power loss And copper core fatigue, repeated bending is not easy to break, so easy wiring; at the same time, copper core of high mechanical strength, can withstand greater mechanical tension, to the construction of laying a great convenience, but also to create the conditions for mechanized construction. On the contrary, because of the chemical characteristics of aluminum, the installation joint is easy to appear oxidation phenomenon (electrochemical reaction) , especially easy to creep phenomenon, easy to lead to failure.
Therefore, copper cable in the use of photovoltaic power stations, especially in the field of directly buried cable power supply, has a prominent advantage. The utility model has the advantages of low accident rate, high reliability of power supply, convenient operation and maintenance, etc. . This is the main reason why copper cable is used in underground power supply.
Therefore, copper cable in the use of photovoltaic power stations, especially in the field of directly buried cable power supply, has a prominent advantage. The utility model has the advantages of low accident rate, high reliability of power supply, convenient operation and maintenance, etc. . This is the main reason why copper cable is used in underground power supply.
05
Cable insulation sheathing material
During the installation, operation and maintenance of photovoltaic power stations, the cables may be laid in the soil below the ground, in the overgrown rocks, on the sharp edge of the roof structure and exposed to the air, and the cables may bear the impact of various external forces. If the cable sheath strength is not enough, the cable insulation will be damaged, which will affect the service life of the cable, or lead to short circuit, fire and personal injury risk. Cable scientists and technicians have found that materials that have been cross-linked by radiation have higher mechanical strength than those that have been treated by radiation. The cross-linking process changes the chemical structure of the polymer for cable insulation and sheath, and the fusible thermoplastic material is converted into the non-fusible elastomer material, the Thermal, mechanical and chemical properties of the cable insulation were improved by cross-linking radiation.
The direct current circuit is often affected by many disadvantageous factors in the operation, which makes the system unable to operate normally. Such as extrusion, bad cable manufacturing, poor insulation materials, low insulation performance, DC system insulation aging, or the existence of some damage defects can cause grounding or become a hidden danger of grounding. In addition to the outdoor environment small animal invasion or biting will also cause DC grounding fault. Therefore, in this case, the general use of armored, with the function of rodenticide-protected cable.
The direct current circuit is often affected by many disadvantageous factors in the operation, which makes the system unable to operate normally. Such as extrusion, bad cable manufacturing, poor insulation materials, low insulation performance, DC system insulation aging, or the existence of some damage defects can cause grounding or become a hidden danger of grounding. In addition to the outdoor environment small animal invasion or biting will also cause DC grounding fault. Therefore, in this case, the general use of armored, with the function of rodenticide-protected cable.
For more information on pv cable , please feel free to call Slocable at 86-769-22010201. You can also email us at pv@slocable.com.cn.
