In the construction process of photovoltaic power station, in addition to the main equipment, such as photovoltaic modules, inverters, step-up transformers, the photovoltaic power cable materials connected to the photovoltaic power plant's overall profitability, operational safety, and efficiency, also For important functions, the following is a detailed introduction to the use and environment of cables and materials commonly found in photovoltaic power plants.
In the construction process of photovoltaic power station, in addition to the main equipment, such as photovoltaic modules, inverters, step-up transformers, the photovoltaic power cable materials connected to the photovoltaic power plant's overall profitability, operational safety, and efficiency, also For important functions, the following is a detailed introduction to the use and environment of cables and materials commonly found in photovoltaic power plants.

According to the system of photovoltaic power station, the cable can be divided into DC cable and AC cable. According to the application and environment, the classification is as follows:

First, DC cable

(1) A series cable between components and components.

(2) Parallel cables between the strings and their strings to the DC distribution box (combiner).

(3) Cable between DC distribution box and inverter.

The above cables are all DC cables. They are widely laid outdoors. They need to be protected from moisture, sun, cold, heat and UV. In some special environments, chemical substances such as acid and alkali are needed.

Second, the AC cable

(1) Connection cable from inverter to step-up transformer.

(2) Connecting cable from step-up transformer to power distribution unit.

(3) The connection cable of the power distribution device to the grid or the user.

This part of the cable is an AC load cable, and the indoor environment is laid more. It can be selected according to the general power cable selection requirements.

Third, photovoltaic special cable

A large number of DC cables in photovoltaic power plants need to be laid outdoors, and the environmental conditions are harsh. The cable materials should be determined according to UV resistance, ozone, severe temperature changes and chemical corrosion. Long-term use of ordinary material cables in such environments will result in fragile cable jackets and may even break down the cable insulation. These conditions will directly damage the cable system and increase the risk of cable short-circuit. In the medium and long term, the possibility of fire or personal injury is higher, which greatly affects the service life of the system. Therefore, it is very necessary to use PV-dedicated cables and components in photovoltaic power plants. Photovoltaic cables and components not only have the best weather resistance, UV and ozone resistance, but also withstand a wide range of temperature changes.

Fourth, the principle of cable design selection:

(1) The withstand voltage of the cable is greater than the maximum voltage of the system. For an AC cable such as 380V output, it is necessary to elect a 450/750V cable.

(2) The connection between the interior of the PV array and the square matrix, the rated current of the selected cable is 1.56 times of the maximum continuous current in the calculated cable.

(3) For the connection of the AC load, the rated current of the selected cable is 1.25 times the maximum continuous current in the calculated cable.

(4) The connection of the inverter, the rated current of the selected cable is 1.25 times of the maximum continuous current in the calculated cable.

(5) Consider the effect of temperature on the performance of the cable. The higher the temperature, the less the current carrying capacity of the cable. The cable should be installed in a place where ventilation and heat dissipation are possible.

(6) Consider that the voltage drop should not exceed 2%.

In the operation of the DC loop, it is often affected by various unfavorable factors to cause grounding, which makes the system unable to operate normally. Such as extrusion, poor cable manufacturing, unqualified insulation materials, low insulation performance, aging of DC system insulation, or the presence of certain damage defects can cause grounding or become a grounding hazard. In addition, small animals invading or biting in outdoor environments can also cause DC ground faults. Therefore, in this case, an armored cable with a rodentproof functional sheath is generally used.

Distributed PV common inverter cable selection:

01

Note: The cable in the form is based on the standard of the national standard copper wire.

If the cable length is greater than 50 meters, please refer to the cable of the larger size.

5. Cable construction of photovoltaic power generation system

The cost of cable engineering construction in photovoltaic power generation projects is generally large, and the choice of laying method directly affects the construction cost. Therefore, rational planning and proper selection of cable laying methods are important links in cable design work.

1. The laying method of cable laying cable is comprehensively considered according to the engineering conditions, environmental conditions, cable specification model, quantity and other factors, and is selected according to the requirements of reliable operation, easy maintenance and technical and economical rationality. The laying of DC cables for photovoltaic power generation projects mainly includes laying of sand buried bricks, laying of pipes, laying of trenches, laying of cable trenches, and laying of tunnels.

The laying of AC cables is not much different from that of general power systems. DC cables are mostly used between photovoltaic modules, between strings to DC combiner boxes, between combiners and inverters. The cross-sectional area is small and large. Generally, cables are bundled along the component brackets or directly buried. DC cables should generally be considered when laying:

(1) The connecting cable between the components and the connecting cable between the string and the combiner box, as far as possible, using the component bracket as the channel support and fixing of the cable laying, can reduce the influence of environmental factors to a certain extent.

(2) The force of cable laying should be uniform and appropriate, and should not be too tight. The temperature difference between day and night in photovoltaic places is large, and cable breakage should be avoided caused by thermal expansion and contraction.

(3) In the photovoltaic material cable lead on the surface of the building, the overall aesthetic appearance of the building should be considered. The laying position should avoid laying cables at the sharp corners of the wall and the bracket to avoid short circuit caused by cutting or grinding damage to the insulation layer, or cut by shearing force. The wire causes an open circuit. At the same time, it is necessary to consider the problem that the cable line is directly struck by lightning.

(4) Reasonably plan the cable laying route, reduce the crossover, and merge as much as possible to reduce the amount of earthwork excavation and cable usage during the construction of the project.

2. Cable connection The DC cable in the photovoltaic power generation system is mostly laid outdoors. The connection method is mainly joint plugging, which can be protected in the pipe, and the component bracket is used as the channel and fixing of the cable laying to reduce the influence of environmental factors. . Other cable connections are roughly the same as in conventional power systems.

Shenzhen Guruiwatt New Energy Co., Ltd. was established in May 2010 with a registered capital of 100 million yuan. It is a national high-tech enterprise specializing in providing new energy system solutions such as photovoltaic inverters, energy storage systems and home intelligent energy management systems. enterprise. Since its establishment, Guruwatt inverters have been exported to more than 100 countries and regions in Europe, America, Australia, Asia, Africa and Latin America, and have been recognized and favored by customers all over the world. Guruwatt has always maintained a leading position in the domestic inverter market and has been committed to being the world's largest supplier of user-side smart energy solutions.







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Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn

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