What is the best power supply scheme for the tunnel fan? What is the appropriate distance between the tunnel fan and the electric control room of the station?

What is the best power supply scheme for the tunnel fan? What is the appropriate distance between the tunnel fan and the electric control room of the station? For tunnel fans in subway, the power supply scheme should be determined according to the power and power supply distance of tunnel fans. At present, the power of subway tunnel fans is large, most of them are 75kW or 90kW, and some may reach 110kW or 160kW. The power supply voltage class is mostly 0.38kV, and two tunnel fans may work at the same time. In most cases, the tunnel fan is powered by the loop control electric control room, whose advantage is that it can be controlled centrally. (1) If the distance between the tunnel fan located in the section and the nearest station substation is not less than 0.3km, an independent section substation (and electric control room) should be set up beside the tunnel fan in the section. Two 35kV power transformers are fed out from the substation located at the nearest station, and after depressurization, they supply tunnel fans and other related loads. The voltage loss of 0.38kV direct power supply for the fan with large distance is relatively large, which is generally above 5%. It is very difficult for the fan to start, so the interval substation must be set up. (2) If the distance between the tunnel fan located within the interval and the nearest station substation is 0.15km≤L< 0.3km, the electric control room should be set up within the section. Two 0.23/0.4kV power supplies fed from the substation located at the nearest station should be distributed to the dual power switching cabinet of the electric control room in the section, and then the tunnel fan and other related loads should be supplied. The power supply voltage loss can meet the fan start-up requirements. (3) If the distance between the tunnel fan located within the interval and the electric control room of the nearest station is 0.08km≤L< 0.15km, section electric control room is not required. The station electric control room supplies power to the tunnel fan for unified control and management. (4) The tunnel fan located in the station is generally less than 0.06km away from the electric control room of the station, so it is powered by the environmental control electric control room of the station.

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