Special cable for photovoltaic power generation system


Special cable for photovoltaic power generation system

1. Summary

The characteristics of photovoltaic cable are determined by its special insulation material and sheath material, which we call cross-linked PE. After irradiation by the irradiation accelerator, the molecular structure of the cable material will change, so as to provide all aspects of its performance. In fact, during installation and maintenance, the cables can be wired on the sharp edge of the roof structure, while the cables must withstand pressure, bending, tension, cross tensile load and strong impact. If the strength of the cable sheath is not enough, the cable insulation layer will be seriously damaged, which will affect the service life of the entire cable, or lead to short circuit, fire and personnel injury risk problems.

Selection and classification of photovoltaic cables

In the solar photovoltaic power generation system, the low-voltage DC transmission part of the cable used, because of the use of environment and technical requirements have different requirements, the overall factors should be considered: the insulation performance of the cable, heat and flame resistance, aging performance and wire diameter specifications. The specific requirements are provided as follows:

1. Connecting cable between solar cell modules and modules.

PV1-F photovoltaic cable, generally directly connected with the connection cable attached to the module junction box, when the length is not enough to use a special extension cable. According to the different power size of the components, this type of connection cable has a cross-sectional area of 2.5m㎡, 4.0m㎡, 6.0m㎡ and 10mm2And so on specifications. This kind of connection cable uses double layer insulation skin, with superior ultraviolet light, water, ozone, acid, salt erosion ability, superior all-weather ability and wear resistance.

2. The connection cable between the storage battery and the inverter.

Use multiple cables that have passed the UL test and connect as nearby as possible. Choosing short and thick cables can reduce the system loss, improve efficiency, and enhance reliability.

3. The connection cable between the battery square array and the controller or the DC junction box.

Multiple flexible wires that pass the UL test are required, and the cross-sectional area specification depends on the maximum current output of the square array. The cross-sectional area of the DC cable is determined according to the following principles: the connection cable between the solar cell module and components, the connection cable between the battery and the battery, and the connection cable of the AC load, the rated cable is 1.25 times of the maximum continuous working current of the cables; and the connection cable between the solar cell and the square array, the connection cable between the battery (group) and the inverter, generally the rated current of the cable is 1.5 times of the maximum continuous working current of each cable.

According to the above uses, photovoltaic cable can be divided into three types of application: TUV photovoltaic cable (cable connected between battery modules and modules); UL photovoltaic cable (connection cable between battery and inverter); photovoltaic standard control cable (connection cable between battery array and controller or DC junction box).

TUV PV cable