In the current widespread promotion and application of new energy photovoltaic power generation, photovoltaic step-up transformer is one of the important equipment in the photovoltaic power generation system. Photovoltaic power generation dedicated box transformer, abbreviated as photovoltaic box transformer, is a high-voltage/low-voltage prefabricated substation that integrates high-voltage switchgear, transformer body, and protective fuses in the oil tank, with low-voltage switchgear and corresponding auxiliary supporting equipment.
Photovoltaic box transformer is a specialized distribution facility that boosts the voltage of 0.27kV or 0.315kV from photovoltaic grid connected inverters to 10kV or 35kV through a step-up transformer, and outputs electrical energy upward through 10kV or 35kV lines. It is an ideal supporting equipment for photovoltaic power generation systems.
The size of the box type substation for photovoltaic power generation and the number of internal switch cabinets are related to the voltage that needs to be stepped up. The higher the voltage level, the more cabinets inside the box. Generally, the final decision can be made based on the design drawings provided by the design institute.
Compared with conventional substations with the same capacity and load, 10kV photovoltaic box type substations occupy less land, reduce investment by about 40% to 50%, and save more than 100000 to 200000 yuan. The container is equipped with intelligent measurement and control terminals to achieve remote intelligent control of the substation.
Usage environment
Altitude: 2500m;
Environmental temperature: between -45 ℃ and+40 ℃;
Relative humidity: daily average not exceeding 95%, monthly average not exceeding 90%;
Installation location: Keep away from sources of fire, explosions, conductive dust, chemically corrosive gases, and places with severe vibrations. If the above conditions are exceeded, users can consult our company.
Introduction to Function and Structure
The trinity of high-voltage switchgear, box type Transformer, and low-voltage switchgear is strong
Complete high and low voltage protection, safe and reliable operation, simple maintenance
Small footprint, low investment, short production cycle, and easy mobility
Unique structure: It can adopt a double-layer (composite board) structure for strong insulation, heat dissipation, ventilation, aesthetics, and high protection level. The shell materials include stainless steel, aluminum alloy, cold-rolled plate, and colored steel plate.
Multiple types: universal, villa, compact, and other styles.
The high-voltage ring main unit can be equipped with a network automation terminal (FIU) with the "four remote" function, which can achieve reliable detection of short circuits and single-phase grounding faults, facilitating the upgrade of automated distribution networks.
The transformer used
The box type transformer adopts low loss, oil immersed, fully sealed S9, S10, S11 series transformers, or environmentally friendly dry-type transformers with resin insulation or NOMEX paper insulation. The bottom can be equipped with a small car, and the transformer can be easily accessed.
High voltage side
The high-voltage side is generally protected by a combination of load switch and fuse. After one phase of the fuse is blown, the three phases are interlocked and tripped. The load switch can be selected from compressed air, vacuum, sulfur hexafluoride and other types, and can be equipped with an electric operating mechanism to achieve automation upgrade. The fuse is a high-voltage current limiting fuse with an impactor, which is reliable in action and has a large breaking capacity. For transformers above 800kVA, vacuum circuit breakers such as ZN12 and ZN28.VS1 can be used for protection.
Low voltage side
The low-voltage side main switch adopts universal or intelligent circuit breakers for selective protection. The outgoing switch adopts a new type of plastic shell switch, which is small in size, short in arcing, and can reach 30 circuits; Intelligent automatic tracking reactive power compensation device, with two switching modes for users to choose from: contactor and non-contact.
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