66kV single-phase booster transformer bank for offshore wind power generation

Abstract

The invention provides a 66kV single-phase booster transformer bank for offshore wind power generation. The rated capacity of the 66kV single-phase booster transformer bank is 2200-11,000kVA; and the66kV single-phase booster transformer bank comprises an iron core, a low-voltage winding, a high-voltage winding, an oil tank, transformer oil, a low-voltage lead, a high-voltage lead, a low-voltage bushing, a high-voltage bushing, an oil conservator, a gas relay, a pressure relief valve, a tapping switch, an oil level thermometer, a winding thermometer, a bushing current transformer and a moisture absorber. The rated voltage at a low voltage side is 0.69kV; the voltage grade at a high voltage side can reach 66kV; the empty load losses are superior to the national standards; the primary-side voltage grade of an existing box-type substation is improved to 35-66kV; the problems that a booster transformer for offshore wind power generation is difficult to install, maintain and change, a powertransmission network is short in transmission distance and a transmission line is high in line loss and large in voltage drop are solved; the long-distance transmission requirements for high-capacityoffshore wind power generation are met; the power is directly transmitted to an onshore booster substation for grid connection; and the 66kV single-phase booster transformer bank is suitable for being used as offshore wind power generation equipment.

Description

technical field [0001] The invention relates to the technical field of electric power supply, in particular to a series of single-phase step-up transformer groups dedicated to offshore wind power generation with a voltage level of 66kV. Background technique [0002] Offshore wind power generation has high economic efficiency in the field of wind power generation, and significant progress has been made in both theoretical research and applied research in the field of offshore wind energy utilization in the world. Offshore wind power is rapidly developing as a competitor to other power generation technologies. [0003] The capacity of the existing booster transformer dedicated to offshore wind power generation is 2-8MVA, and the outlet voltage of the wind turbine is 0.69kV, which is boosted to a voltage level of 35kV by the booster transformer, and then transported to the offshore booster substation by a submarine cable to boost the voltage to 220kV, and then It is transporte...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problems of large volume, low primary side voltage, short transmission distance, large submarine cable cross-section, high line loss, large voltage drop, high purchase and laying cost of submarine cables, etc. A series of 66kV voltage class single-phase step-up transformers for offshore wind power generation, rated capacity 2200kVA ~ 11000kVA, primary side rated output voltage level is 66kV, secondary side rated voltage 0.69kV, frequency 50Hz, single-phase double winding, non-excitation modulation Voltage, no-load loss reaches the national secondary energy efficiency standard and is lower than the national standard and power grid standard, low partial discharge, low noise, strong corrosion resistance, long service life

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