Medium pressure bottom plate

As a new type of building that integrates green energy and parking functions, photovoltaic carports have been widely used in modern cities. However, since they are usually installed in outdoor locations, they are susceptible to natural disasters such as lightning strikes and fires. Therefore, it is particularly important to improve the lightning protection and fire prevention capabilities of photovoltaic carports to ensure their safe and reliable operation. This article will discuss in detail how to enhance the lightning protection and fire prevention capabilities of photovoltaic carports from three aspects: material selection and design, lightning protection measures, and fire prevention measures.

1. Material Selection and Design

In the design and construction process of photovoltaic carports, the choice of materials is crucial. For lightning protection, steel structures themselves are good conductors and can be part of the lightning protection system. Therefore, materials with good electrical conductivity should be prioritized in the design. At the same time, the selection of membrane materials should also have certain anti-static properties to reduce static accumulation and lower the risk of lightning strikes. For example, flame-retardant polyvinyl chloride (PVC) membranes or polytetrafluoroethylene (PTFE) membranes can be chosen, as these materials not only have good fire resistance but can also reduce static generation to some extent.

In terms of fire prevention, the flame-retardant properties of membrane materials are particularly critical. Common fire resistance levels include B1, B2, and A-level, with A-level flame-retardant membrane materials having higher flame-retardant performance, effectively reducing the likelihood of fire occurrence. Therefore, when designing photovoltaic carports, A-level flame-retardant membrane materials should be prioritized. Additionally, the supporting structures of the carports are usually made of steel or aluminum alloy, which may also be affected in the event of a fire. Therefore, fire protection treatments should be applied to the supporting structures during the design and manufacturing process, such as using flame-retardant coatings or adding fire isolation layers to enhance their fire resistance.

2. Lightning Protection Measures

Lightning protection measures are an important means to protect photovoltaic carports from lightning strikes. First, lightning rods or lightning belts should be installed at the highest points of the carport, such as on the top supporting structures, to direct lightning to the ground, protecting the carport and photovoltaic components from lightning strikes. The selection of lightning rods and lightning belts should be determined based on the specific dimensions of the carport and the lightning activity in the area to ensure they can effectively guide the lightning current.

Secondly, proper grounding is a key aspect of lightning protection measures. The grounding system should ensure that the supporting structures of the carport, the metal frames of the photovoltaic components, and the electrical systems all have good grounding effects. Specifically, grounding networks can be set up around or below the carport, using sufficiently thick copper or steel wires as grounding wires to connect the metal structures of the carport to the grounding network. At the same time, the grounding resistance should be less than 10 ohms to ensure that the current can quickly flow into the ground. Additionally, the grounding system should be regularly tested and maintained to ensure its effectiveness.

In addition to lightning rods and grounding, consideration can also be given to installing lightning wires on the steel structure of the carport, connected to the lightning rods or lightning belts, forming a more complete lightning protection network. At the same time, surge protectors should be installed in the electrical parts of the photovoltaic system to protect electronic devices from lightning strikes. The implementation of these measures should be determined based on local lightning activity, the usage environment of the carport, and the specific needs of users to ensure that the lightning protection system can effectively protect the carport while meeting the actual usage needs of users.

3. Fire Prevention Measures

Fire prevention measures are another important aspect of ensuring the safe operation of photovoltaic carports. First, complete fire extinguishing equipment, such as dry powder extinguishers and foam extinguishers, should be provided to enable timely firefighting in the event of a fire. These extinguishing devices should be placed in easily accessible and operable locations and should be regularly checked and maintained to ensure their effectiveness.

Secondly, reasonably setting up fire isolation zones is also an important part of fire prevention measures. In the design of the carport, fire isolation zones should be reasonably set up to divide the interior of the carport into several independent areas to prevent the spread of fire. At the same time, regular fire hazard inspections should be conducted on the photovoltaic carport to promptly repair and replace aging or damaged materials and equipment, ensuring that its fire resistance is in good condition.

In addition, increasing fire alarm systems is also an important means to enhance the fire prevention capabilities of photovoltaic carports. Installing reliable fire alarm systems, including smoke detectors and fire alarm buttons, can timely detect fire hazards and take measures to prevent fires. The setup of these systems should be determined based on the specific conditions of the carport and user needs to ensure they can effectively function.

In summary, improving the lightning protection and fire prevention capabilities of photovoltaic carports requires addressing three aspects: material selection and design, lightning protection measures, and fire prevention measures. Through reasonable material selection and design, as well as the implementation of comprehensive lightning protection and fire prevention measures, the impact of lightning strikes and fires on photovoltaic carports can be effectively reduced, ensuring their safe and reliable operation.

Regularly inspect the structure and equipment of the photovoltaic carport, including whether there are any damages or cracks on the surface of the photovoltaic panels, whether the support structure is stable, and whether the cable connections are loose, etc. Timely detection of issues and repairs can prevent accidents.

Lightweight yet high-strength materials are typically used, such as aluminum alloys or carbon steel, which have good corrosion resistance and structural stability.

Choose photovoltaic panels with targeted designs, such as those with high-strength frames and thick laminated glass, to enhance their ability to withstand hail, heavy snow, and strong winds.

High-efficiency and high-durability solar photovoltaic panels should be selected, such as monocrystalline silicon, polycrystalline silicon, or thin-film solar panels. When choosing, factors such as photoelectric conversion efficiency, weather resistance, and impact resistance should be considered to ensure long-term stable power generation performance.