Guangzhou Metro Line 3

       When the subway train is running, it needs to use relatively high-power electric energy as the power to start the traction of the vehicle to complete the smooth running. However, the power supply equipment of the subway system presents a low load during the night and early morning hours, so the power supply equipment in the subway power supply system is in a state of overload and low load cycle for a long time. At present, domestic subways generally use SCB10 series dry transformers to supply power to electromechanical equipment in stations, and their no-load loss accounts for about 0.4% of their maximum power supply load. (*Note: The data comes from Yu Long and Li Hanqing's "Feasibility Analysis of Applying Amorphous Alloy Dry-type Transformer in Subway System") Calculated according to the total energy consumption of the national urban rail transit of 21.31 billion kWh in 2021, it is equivalent to a yearly consumption of about 85.24 million degree of electricity. According to the conversion of mainstream electric vehicles that consume 16 kilowatt-hours of electricity per 100 kilometers, it can power an electric vehicle to travel about 530 million kilometers. Transformers are important equipment in the power supply system. Improving the energy efficiency of transformers is of great significance to the energy saving and carbon reduction of subways.

       Haihong Electric, Guangzhou Metro Group, and Guangzhou Metro Design Institute implement energy-saving and carbon-reducing work requirements during development, and jointly develop ultra-energy-saving transformers used in the subway field-open ventilated amorphous alloy 3D wound core dry-type transformer, open ventilated amorphous alloy 3D wound core traction rectification dry-type transformer. The 3D wound core technology reduces the operating loss of the transformer and improves safety and reliability. The large-capacity amorphous alloy und core dry-type transformer greatly reduces the no-load loss of the transformer. The project has developed a 1250kVA amorphous alloy 3D wound core dry-type transformer with a voltage level of 35kV and a 250kVA open ventilated 3D wound core dry-type transformer. It has successfully passed the test and successfully connected to the grid. So far, the operation is in good condition, meeting the power supply needs of Metro Line 3 to varying degrees.

SGBH17-RL-1250/33Open ventilated amorphous alloy 3D wound core dry-type transformer

       HAIHONG successfully developed SGBH17-RL-1250/33 open ventilated amorphous alloy 3D wound core dry-type transformer in 2019. The product has passed various routine, type and special tests of the National Smart Grid Power Transmission and Distribution Equipment Quality Supervision and Inspection Center, and all performance indicators of the iron core meet the requirements of rail transit safety, energy saving, and environmental protection. Compared with the energy-saving requirements of GB/T 35553-2017 urban rail transit electromechanical equipment, its energy-saving performanceThe average no-load loss of the product is reduced by about 66%, the average load loss is reduced by about 8%, and the no-load current is as low as 0.12%. The energy-saving effect is very significant.