1. Technical characteristics of urban rail power transformer
·The underground environment has a high fire safety and fully epoxy vacuum cast dry structure, which is free of mineral oil, non flammable and non explosive, and has no risk of leakage or fire. It fully meets the Class A fire protection regulations for subway underground stations and can be installed in the distribution room on the lower level of the platform and station hall.
·24-hour uninterrupted long-term operation optimizes no-load and load losses, supports continuous loading for 7 × 24 hours throughout the year, adapts to the all-weather operation load of the subway, and maintains stable temperature rise under alternating light and full load conditions.
·Low noise damping and noise reduction design with iron core optimized magnetostrictive technology. The whole machine is equipped with double-layer elastic damping rubber pads, and the operating noise is strictly controlled to avoid interference with passenger areas and precision equipment in the computer room.
·Moisture proof, dust-proof, high insulation, low partial discharge vacuum integral epoxy resin casting sealed winding, extremely low partial discharge, stable insulation in high humidity and dusty underground environment, no need for oil maintenance, reducing the workload of underground machine room operation and maintenance.
·The short-term overload capacity is sufficient. During peak hours in the morning and evening, the air conditioning and elevators at the station are centrally started, resulting in a large short-term impact load. Under forced air cooling, the output capacity can be increased by 40% to 50% to cope with instantaneous load peaks.
·The intelligent temperature control linkage machine room system is equipped with PT100 platinum resistance temperature measuring elements embedded in the winding, which can be connected to the subway comprehensive monitoring system to upload temperature data in real time. It can also trigger over temperature alarms and high temperature trips, and can be linked to ventilation and firefighting equipment.
·Compact structure suitable for small machine rooms, modular compact frame design, small footprint, suitable for limited installation space in subway underground distribution rooms, easy to lift and maintain.
2. Product features
2.1 Design standards: GB, IEC
2.2 Capacity (MVA): 0.4 to 2.5
2.3 Voltage (KV): 10-35
2.4 Cooling method: AN/AF
2.5 Installation locations: underground subway station distribution room, mezzanine distribution room in station hall, ground light rail substation, logistics distribution room in vehicle depot, indoor machine room in rail transit control center, limited to indoor ventilated enclosed spaces.
2.6 Application Scenarios: Auxiliary power supply for urban subways, urban rapid transit, light rail, tram platforms, logistics workshops in vehicle depots, rail transit dispatch control centers, and commercial supporting power supply on subway roofs.
2.7 Insulation level: F/H
2.8 Operating environment
·Environmental temperature: ambient air temperature -35 ℃~+40 ℃;
·Altitude: ≤ 1000m. High altitude mountain rail transit can be customized to strengthen insulation and increase heat dissipation specifications;
·Atmospheric conditions: The relative humidity of the underground computer room is ≤ 95% (no condensation), and there are no highly corrosive, flammable, or explosive gases or dust. The computer room is equipped with a forced ventilation and dehumidification system;
·Installation conditions: Good indoor ventilation, shock-absorbing rubber pad installed on the base, optional IP21 protective shell to prevent debris and moisture from contacting the winding.
2.9 Types
·By iron core material: ordinary silicon steel urban rail power transformer, amorphous alloy energy-saving urban rail power transformer;
·By cooling method: AN natural cooling type, AF forced air cooling type;
·According to protection level: IP00 open type, IP21 computer room closed type (standard for subway);
·By usage area: standard station power transformer, large capacity power transformer for large transfer stations, industrial power transformer for vehicle depots;
·According to insulation and heat resistance: F-grade conventional type, H-grade high temperature and high humidity special type.
