1. Technical characteristics of prefabricated wind power transformers
The modular structure of the three independent compartments provides stronger heat dissipation for external transformers. The high voltage room, low voltage room, and transformer area are physically isolated. The external box and heat sink of the transformer body are completely open, and the natural convection heat dissipation efficiency far exceeds that of a sealed European transformer. It is suitable for long-term full load operation of new energy under full load conditions such as high noon photovoltaic and fan load, and is less prone to heat accumulation and tripping.
The high-voltage independent complete set switch has a higher safety level than the American transformer. Unlike the American box transformer, the high-voltage components of the transformer are immersed in the oil tank. The high-voltage chamber of the Hua transformer is equipped with an independent vacuum circuit breaker/ring main unit, matched with isolation switches, grounding switches, and lightning arresters. The main switch and grounding switch are equipped with mechanical five proof interlocking, and the maintenance power-off grounding dual protection is provided, with higher reliability.
The busbar direct connection structure reduces operational hazards. High voltage switches and transformers are hard connected with copper busbars, replacing cable connections, eliminating cable aging and joint heating faults, and achieving higher stability in long-term outdoor harsh environments.
The wide load fluctuation tolerance design is suitable for intermittent photovoltaic output and frequent load changes of wind speed fluctuations from 0 to 100%. The transformer optimizes the core and winding losses, and can withstand 1.2 times continuous overload and 1.5 times short-term impact load for a long time.
·Improve the comprehensive protection system for electricity protection: overcurrent interruption, overcurrent, overload, single-phase grounding; Non electricity protection: Transformer gas, oil temperature, oil level, pressure release; Intelligent measurement and control throughout the station, supporting telemetry, remote signaling, and remote control to upload to the station's central control platform.
The outdoor strong anti-corrosion and weather resistant structure box adopts thickened aluminum zinc anti-corrosion steel plate. The stainless steel shell can be customized in coastal salt spray areas, with an IP54 protection to resist sand and dust, rain and snow, day night temperature difference, and high humidity erosion; The whole machine is designed with full sealing and anti condensation.
Large capacity adaptation and convenient maintenance. A single unit supports a maximum capacity of 12.5MVA. The box is reserved with a spacious maintenance door, and the transformer can be repaired, filtered, and replaced without disassembling the box, greatly reducing the workload of operation and maintenance.
The comprehensive cost balance occupies only 58% of the European box type transformer, which is lower in cost than the same capacity European transformer. There is no forced fan for heat dissipation, reducing fan failures and power consumption in the later stage, and the full life cycle operation and maintenance cost is lower.
2. Product features
2.1 Design standards: GB, IEC
2.2 Capacity (MVA): 1 to 12.5
2.3 Voltage (KV): 10-35
2.4 Cooling method: ONAN
2.5 Installation location: mountain/plain photovoltaic power station, mudflat fish light complementary power station, onshore wind turbine generator position, energy storage and pressure boosting site area, remote industrial park outdoor concrete foundation, outdoor ground installation. 2.6 Application scenarios: Large centralized ground photovoltaic power stations, complementary photovoltaic projects for fishing and agriculture, mountain wind power plants, distributed industrial and commercial photovoltaics, wind power supporting boosting equipment, grid side shared energy storage boosting stations, and outdoor distribution in remote mining areas.
2.7 Insulation level: A
2.8 Operating environment:
Environmental temperature: -35 ℃ to+40 ℃;
Altitude: ≤ 1000m, customized to strengthen insulation and increase heat dissipation specifications for high-altitude mountainous areas within 2000m;
Atmospheric conditions: relative humidity ≤ 95% (no condensation at 25 ℃); Inland sand and dust resistant, coastal customizable salt spray anti-corrosion models; No strong explosive or corrosive gases;
Installation conditions: The foundation is flat and the drainage is unobstructed. A ventilation gap is reserved at the bottom of the box, and a dehumidification device is installed along the coast
2.9 Types
According to the type of adapted energy: photovoltaic dedicated transformer, wind power dedicated transformer, energy storage boosting transformer, and general distribution transformer;
According to the high voltage level: 10kV transformer, 35kV large capacity transformer;
According to high-voltage switch configuration: load switch type, vacuum circuit breaker comprehensive protection type;
