国产在线精品无码AV不卡顿,综合图片亚洲综合网站,日韩A∨精品日韩在线观看 ,日本乱码卡一卡新区入口

Welcome to the official website of Suzhou Aite Power Transmission and Distribution Equipment Co., Ltd
+ WeChat ID：WANGYUNHUA

The current position：Home page > Information dynamic  > Industry Trends return
ress the navigation

What are the applications of non-metallic box type substations in photovoltaic power plants

source：www.gusiapp.cn  |  Release time：2025年09月22日
        In photovoltaic power plants, non-metallic box substations (referred to as "non-metallic box substations") are an important alternative to traditional metal box substations. Their core advantages include strong weather resistance, excellent insulation performance, light weight, corrosion resistance, and low operation and maintenance costs. They can adapt to the special operational needs of photovoltaic power plants, especially in complex scenarios such as distributed, mountainous, and coastal areas. Its specific applications can be classified according to "power station type", "core functional scenario", and "special adaptation scenario", covering the entire chain from the power generation side to the user side. The following is a detailed analysis:
1、 Application scenarios by type of photovoltaic power station
         Photovoltaic power plants can be divided into centralized, distributed, microgrid photovoltaic, etc. according to their scale and access methods. Non metallic box transformers play differentiated roles in different scenarios:
1. Centralized photovoltaic power station (large ground power station)
         Centralized power stations are usually built in open areas such as deserts, Gobi, and plains, with a large installed capacity (≥ 10MW), and need to withstand extreme weather conditions (high temperature, severe cold, strong sandstorms) for a long time.             The application of non-metallic box transformers focuses on the boosting process and regional distribution:
         Inverter+Box Transformer Integrated Unit: In centralized power stations, multiple inverters (such as 500kW/1MW level) need to invert low-voltage DC power (DC 800-1500V) into low-voltage AC power (AC 380V/690V), and then boost it to medium voltage (such as 10kV/35kV) through box transformers to connect to the power grid. The non-metallic box transformer can be integrated with the inverter design, and the outer shell is made of glass fiber reinforced plastic (FRP), SMC composite materials, etc., which can resist the strong wind and sand wear of the Gobi desert, extreme temperature differences in the desert (-30 ℃~60 ℃), and non-metallic materials have no risk of metal corrosion, avoiding equipment short circuit failures caused by box corrosion.
         Remote area distribution box transformer: Centralized power stations are often equipped with auxiliary loads such as operation and maintenance living areas, photovoltaic module cleaning equipment power supply, etc. Non metallic box transformers can be used as regional distribution units to reduce medium voltage to 380V/220V and supply power to auxiliary facilities. Its lightweight characteristics (30% -50% lighter than metal boxes of the same capacity) make it easy to transport and install in areas with inconvenient transportation such as deserts. At the same time, the insulated shell can reduce the risk of electric shock and improve operation and maintenance safety.
2. Distributed photovoltaic power plants (commercial/residential)
         Distributed power stations are often built on the roofs of industrial and commercial plants, residential buildings, agricultural greenhouses, and other scenarios with limited space and close proximity to load centers. The core application of non-metallic box type transformers is miniaturization, low noise, and adaptability to the environment
         Rooftop power station for industrial and commercial plants: The installed capacity on the roof of the plant is usually 1MW-10MW, and the AC 380V/690V output by the inverter needs to be stepped up to 10kV and connected to the plant's distribution network or public power grid. The non-metallic box transformer has a small volume (can be designed as a compact type, occupying 20% less space than the metal box transformer), and can be directly installed on the roof or in the surrounding open space of the factory. The color of the shell made of FRP or other materials can be customized (such as the same color as the exterior wall of the factory) to avoid damaging the appearance of the building; At the same time, its insulation performance is excellent, which can reduce electromagnetic interference to precision equipment in the factory. The low noise (operating noise ≤ 55dB) also meets the environmental protection requirements of the factory area.
         Household/Civil Building Photovoltaic: The installed capacity of household photovoltaic is mostly 5kW-20kW, and the AC 220V/380V output by the inverter needs to be connected to the community distribution network through a small box transformer (such as 0.4kV/10kV). The non-metallic box transformer is lightweight (with a single unit weight controlled within 500kg), does not require complex foundations, and can be directly installed on balconies, corridors, or residential green belts. The shell has no risk of metal conductivity and can prevent children from accidentally getting electrocuted; And its waterproof rating can reach IP65, which can withstand rainwater immersion and is suitable for outdoor residential environments.
         Agricultural photovoltaic complementary/fishery photovoltaic complementary power station: This type of power station is built above farmland and fish ponds, in a humid and humid environment, and needs to avoid metal corrosion and pollution of soil or water bodies. The anti-corrosion characteristics of non-metallic box transformers (SMC composite material resistant to salt spray and mold) can adapt to high humidity environments, and the insulation shell will not produce metal debris due to corrosion, which meets agricultural environmental protection requirements; In addition, its casing can be designed with a waterproof sealing structure to prevent water vapor from entering the interior and causing damage to transformers and switchgear due to moisture.
3. Microgrid photovoltaic power station (off grid/weak grid area)
         Microgrid photovoltaics (such as remote villages, islands, and border outposts) need to independently achieve a closed-loop system of "power generation energy storage distribution". The application of non-metallic box transformers focuses on multi energy collaboration and extreme environmental resistance
         Off grid photovoltaic microgrid: In areas without public grid coverage, non-metallic box transformers can integrate "photovoltaic inverters+energy storage converters (PCS)+distribution switches" to integrate photovoltaic energy with energy storage batteries, providing stable 220V/380V power supply for loads. Its shell is resistant to salt spray (suitable for islands), low temperature (suitable for high-altitude rural areas, can operate normally at -40 ℃), and there is no risk of "electrochemical corrosion" of metal materials (to avoid damage to the box in high salt environments on islands), which can ensure the long-term reliable operation of microgrids.
        Weak current grid connection support: In some remote areas, the grid capacity is weak, and the integration of photovoltaics can cause voltage fluctuations. Non metallic box transformers can be equipped with "reactive power compensation devices (SVG)" or "voltage regulation modules" to stabilize the grid voltage while boosting the grid connection. Their insulation structure can reduce equipment to ground capacitance and reduce the risk of resonance in weak current grids.
2、 Application scenarios based on core functions
        Regardless of the type of power station, the core functions of non-metallic box type transformers revolve around "energy conversion, equipment protection, and convenient operation and maintenance". Specific applications can be divided into three categories:
1. Electric energy boost/buck conversion (core function)
        The core requirement of photovoltaic power plants is to convert the low-voltage direct current generated by photovoltaic modules (converted into low-voltage alternating current by inverters) into medium voltage electricity that meets grid access standards (such as 10kV/35kV), or provide low-voltage electricity for local loads (such as 380V/220V). The application of non-metallic box transformers in this loop includes:
        Step up transformer: Over 90% of photovoltaic power plants (centralized and distributed) require this type of transformer to step up AC 380V/690V to 10kV/35kV, avoiding line losses caused by long-distance transmission of low voltage (such as 10km lines, medium voltage transmission losses are reduced by more than 80% compared to low voltage). The insulation shell of non-metallic box transformers can reduce the risk of "ground leakage" during the boosting process, especially suitable for humid or dusty environments.
        Voltage reducing transformer: mainly used for "self use" distributed power stations, such as factories reducing the 10kV electricity generated by photovoltaics to 380V for direct use by workshop equipment, or communities reducing the 10kV electricity to 220V for residential electricity. The low loss characteristics of non-metallic box transformers (iron core loss is reduced by 5% -10% compared to traditional metal box transformers) can reduce energy waste during the voltage reduction process and improve power plant revenue.
2. Equipment integration and protection (security functions)
        Photovoltaic box transformers need to integrate transformers, high-voltage switches (such as circuit breakers, isolating switches), low-voltage switches, relay protection devices, measurement and control equipment, etc. The shell and internal structure design of non-metallic box transformers can provide reliable protection for these devices:
        Extreme environmental protection: the waterproof level of the shell can reach IP65 (completely dust-proof and spray resistant), and some products can reach IP67 (short-term immersion), which can resist rainstorm, typhoon (such as coastal power stations), and heavy snow (such as high-altitude power stations); The aging resistance of FRP material (no significant aging after 5000 hours of ultraviolet irradiation) can prevent the shell from becoming brittle and cracking, and protect internal equipment from environmental erosion.
       Electrical safety protection: Non metallic materials (such as SMC and FRP) have a volume resistivity of ≥ 10 1?Ω· cm, and their insulation performance is much better than that of metals (metal resistivity ≈ 10 ??Ω· cm), which can effectively isolate internal high-voltage equipment from the external environment and reduce the risk of electric shock for operation and maintenance personnel; At the same time, the non-metallic shell has no electromagnetic shielding and does not affect the wireless signal transmission of internal measurement and control equipment (such as 4G/5G remote monitoring).
3. Lightweight and convenient operation and maintenance (auxiliary functions)
       Photovoltaic power plants are often built in areas with inconvenient transportation (mountains, rooftops, islands), and the lightweight and modular design of non-metallic box transformers can significantly reduce installation and operation costs:
       Lightweight installation: Under the same capacity, the weight of non-metallic box transformers is only 50% -70% of that of metal box transformers (such as 10kV/500kVA box transformers, with metal models weighing about 1500kg and non-metal models weighing about 800kg), without the need for large lifting equipment. Roof installation can reduce building load-bearing pressure (especially suitable for old factory roofs), and can be transported by small boats during island transportation.
       Modular operation and maintenance: Non metallic box transformers can adopt a "split design" (transformer compartment and switch compartment are independent), and the corresponding compartment can be opened separately during operation and maintenance without the need for overall disassembly; The surface of the shell is smooth and easy to clean, and there is no need for rust removal and maintenance after metal corrosion. The operation and maintenance cost is reduced by 30% -40% per year compared to metal box transformers.
3、 Special adaptation scenarios (non substitutability of non-metallic box transformers)
      In some special environments, non-metallic box transformers have advantages that traditional metal box transformers cannot replace due to their material properties. Specific scenarios include:
1. Photovoltaic power stations in coastal/high salt spray areas
      The high salt fog environment in coastal areas (such as offshore photovoltaic and coastal mudflat power stations) will lead to serious corrosion of metal box type transformer substation within 1-2 years (box perforation and short circuit of internal metal parts), while the SMC/FRP material of non-metallic box type transformer substation has excellent salt fog resistance (tested according to GB/T 10125 standard, no corrosion and cracking after 5000h salt fog test), which can guarantee the service life of equipment for more than 15 years. It is a good choice for coastal photovoltaic power stations.
2. Photovoltaic power plants in high-altitude/low-temperature areas
       In high-altitude areas (such as photovoltaic power stations on the Qinghai Tibet Plateau), low air pressure and large temperature differences (-40 ℃~50 ℃) can cause the welding parts of metal box transformers to crack due to thermal expansion and contraction, leading to rainwater infiltration; The non-metallic box transformer adopts an integrated molding process (without welding seams), and the material has good low-temperature toughness (no significant decrease in impact strength at -40 ℃), which can adapt to extreme temperature differences at high altitudes and avoid damage to the box body.
3. Photovoltaic power stations in environmentally sensitive areas
       Photovoltaic power stations in nature reserves and ecological scenic areas (such as "photovoltaic+tourism" projects) have high requirements for equipment environmental protection. The paint coating of metal box transformers may peel off and pollute the soil, while the material of non-metal box transformers (such as FRP) does not release volatile organic compounds (VOCs) and can be recycled after disposal (SMC composite materials can be crushed and molded again), which meets ecological environmental protection requirements; At the same time, the shell color can be customized as "green" or "earthy yellow" to blend with the natural environment and reduce visual damage.