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Photovoltaic Box 35kV
Photovoltaic Box – type Transformer Substation
The 35kV photovoltaic box transformer is a pre installed boosting substation equipment designed specifically for large and medium-sized ground photovoltaic power stations and centralized photovoltaic bases. It integrates boosting transformers, high-voltage switches, low-voltage distribution, intelligent monitoring, lightning protection and other modules into a standard box to achieve low-voltage to 35kV high-voltage collection and boosting after DC reverse transformation of photovoltaic series, meeting the grid connected transmission needs of large capacity photovoltaic power stations. It adopts an outdoor integrated pre installed structure, with short on-site installation and commissioning cycles, and is suitable for large-scale photovoltaic scenarios such as deserts, Gobi, and mountains.
Features
1. Strong adaptability to large capacity boosting:
Suitable for 1-6MW string/centralized inverters, with a single capacity covering 1600-3150kVA, meeting the centralized boosting needs of large and medium-sized photovoltaic arrays, reducing the number of grid connection points, and minimizing line losses.
2 . High protection outdoor without civil engineering:
The box adopts IP54/IP55 high protection level, anti-corrosion, anti salt spray, anti sun, anti wind and sand, and can be directly installed on the outdoor floor without the need for a dedicated distribution room, greatly saving civil engineering costs and construction period.
3. Full scenario intelligent operation and maintenance:
equipped with a photovoltaic dedicated intelligent monitoring unit, supporting real-time collection of oil temperature, oil level, partial discharge, and electrical parameters, remote signaling, telemetry, remote control, automatic abnormal alarm, suitable for unmanned photovoltaic power stations.
4. Low loss energy-saving design:
Adopting low loss amorphous alloy/high permeability silicon steel sheet transformers, the no-load loss is reduced by more than 20%, improving the power generation income of the photovoltaic power station throughout its life cycle and adapting to long-term continuous operation.
5. Excellent grid compliance:
Built in islanding protection, overvoltage/undervoltage, overcurrent, and reverse power protection, meeting GB/T 19964 and Q/GDW photovoltaic grid connection standards, quickly responding to grid dispatch instructions, and strong grid stability.
Rated voltage: 35kV/0.69kV
Protection level: IP54/IP55
Cooling method: ONAN/AFAN
Box material: Cold rolled steel plate spray coated/aluminum alloy composite structure
Execution standards: GB/T 17467, GB/T 1094, GB/T 19964
Optional configurations: SVG reactive power compensation, communication management machine, fire detection, environmental temperature control system
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Specification
| Item | Unit | High-Voltage Apparatus | Transformer | Low-Voltage Apparatus |
| Rated Voltage | kV | 6/10 | 6/0.4, 10/0.4 | 0.4 |
| Rated Capacity | kVA | 50–1600 | ||
| Rated Current | A | 200, 400, 630 | 100–3200 | |
| Rated Short-Circuit Breaking Current | A | Load Switch: 400–630 | ≥30kA | |
| kA | Combined Switch: Depends on fuse | |||
| Rated Short-Time Withstand Current | kA | 20,25(4s) | 30 (1s) | |
| Rated Peak Withstand Current | kA | 50,63 | ≥75 | |
| Power Frequency Withstand Voltage (1min) | kV | Relatively and alternately 28 | 35 (oil-immersed) | 2500V |
| Isolating gap: 32 | 35 (dry-type) | |||
| Lightning Impulse Withstand Voltage (Peak Value) | kV | Phase-to-ground and phase-to-phase: 75 | 75 | 12 |
| Isolating gap: 85 | 85 | |||
| Enclosure Protection Class | IP32 | |||
| Noise Level | dB | 55 | ||
| Executive Standards | GB/T 17467 High-Voltage / Low-Voltage Pre-installed Substation | |||
| DL/T537 Technical Conditions for Ordering of 6–35kV Packaged Substation | ||||
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FAQs
What is the main capacity of photovoltaic inverters that 35kV photovoltaic box transformers are suitable for?
It is mainly suitable for 1.5-6MW centralized inverters and high-power string inverters. A single box transformer can correspond to 1-2 photovoltaic inverter units, and is a standard boosting equipment for large-scale photovoltaic bases with a capacity of over 100MW.
Is it necessary to regularly open and maintain the cover for long-term outdoor operation?
There is no need to frequently open the lid, and the high protection design of the box can withstand harsh outdoor environments. It only requires remote inspection through the monitoring background on a periodic basis, combined with annual external testing and replacement of vulnerable parts.
Can it be adapted to high-altitude and strong sandstorm areas?
High altitude insulation reinforcement and strong wind and sand sealing reinforcement can be customized, suitable for altitudes up to 4000m. Through anti-corrosion and dustproof treatment, it meets the stable operation of photovoltaic power stations in northwest deserts and plateaus.
What are the core application differences between 35kV box transformers and 10kV box transformers?
The 35kV box transformer is oriented towards large capacity centralized photovoltaic power stations, and after boosting, it is directly connected to the 35kV collection station, with longer transmission distance and lower line loss; 10kV transformer substations are commonly used for nearby grid connection of small and medium-sized distributed photovoltaics.
Does it support joint use with energy storage systems?
Support integrated interface design for photovoltaic and energy storage, with reserved space for energy storage inverters to connect to the grid, achieving photovoltaic and energy storage combined boost and grid connection, and adapting to new energy storage photovoltaic integrated power stations.
Related Applications
Large scale ground centralized photovoltaic power station: It is mainly used in 100 MW, GW desert, gobi and mudflat ground photovoltaic bases, undertakes the task of centralized boosting of electric energy of multi array inverters, and is connected to the booster station through 35kV power collection lines to achieve large capacity and long-distance transmission. It is the core substation equipment of national large-scale photovoltaic base projects.
Photovoltaic composite projects (agricultural/fishery complementary): In composite photovoltaic projects such as agricultural and fishery complementary, the outdoor prefabricated structure does not occupy a large amount of land and can be flexibly arranged in idle areas around fields and fish ponds, taking into account both agricultural/fishery production and photovoltaic power generation, with stable and reliable boosting and transmission.
Large scale photovoltaic power stations in mountainous areas: In response to the complex terrain and poor construction conditions in mountainous areas, the integrated pre installed structure reduces the amount of on-site construction, and the high protection design resists the rainy, foggy, and large temperature difference environment in mountainous areas, achieving efficient collection, boosting, and grid connection of mountainous photovoltaic arrays.
Integrated photovoltaic and energy storage power station: used in conjunction with large-scale energy storage systems to achieve unified boost management of photovoltaic power generation, energy storage charging and discharging, stabilize photovoltaic power fluctuations, enhance grid acceptance capacity, and adapt to photovoltaic storage combined power stations under new power systems.
