Beijingnan railway station is the largest modern railway passenger station in Asia and the original "largest station in Asia". On August 1, 2008, the official opening of Beijing South Railway Station replaced Beijing West Railway Station in the first place in Asia. As of 2009, Beijing West Station remained the largest daily passenger flow train station in China.
This project uses 500 meters, with separate meters used in the distribution room of each platform.
The distribution room is usually equipped with transformers, uninterruptible power supply (EPS), DC panels, diesel generator sets, and high/low voltage distribution cabinets. Usually, power instruments are configured on the distribution cabinet for terminal data collection.
The main monitoring contents of the intelligent distribution system include:
Power monitoring: monitoring the voltage, current, power, power factor, frequency status of the incoming and outgoing lines of high and low voltage power supplies, and calculating the power supply quantity.
■ Transformer monitoring: transformer temperature monitoring, fan operation of air-cooled transformer, oil temperature and oil level monitoring of oil cooled transformer.
Load monitoring: monitoring the voltage, current, and power of loads at all levels. When overloaded, the system stops the low priority load.
Line status monitoring: Status monitoring and fault alarm of high-voltage incoming, outgoing, and secondary incoming and connecting circuit breakers.
■ Control by power supply: automatically start the diesel generator or gas turbine generator set when the main power supply is interrupted, stop the standby power supply when the power supply is restored, and conduct the switching operation. Automatic switching of high and low voltage control cabinets, energy-saving control of the system; Implement linkage control of power equipment; Automatic statistical measurement of tenant electricity consumption.
The main functions and system composition of the intelligent power distribution system are as follows:
The distribution system of rail transit is basically composed of station hall or platform level distribution and overall monitoring distribution, that is, each track line is equipped with a distribution system at each station, and finally, each sub station is centralized at the main station for centralized monitoring.
The main station can adopt an extension management mode, collect various power distribution parameters and upload them to the extension, and then connect each extension to the main monitoring center through fiber optic connection, which is managed by the main monitoring host.
According to the scale and requirements of rail transit, the requirements for intelligent power distribution systems may vary. However, fundamentally, all of them are collected through multi-functional power instruments, uploaded to the upper computer system through communication bus, and processed by professional system software to monitor and control the intelligent building.
From a structural perspective, the intelligent power supply and distribution system can be divided into three layers: on-site I/O, communication management layer, and central control layer. Among them, the control layer is the control core of the entire system, monitoring and controlling the operation of the power supply system, and can also be used for human-machine dialogue interface, data processing, and storage management; On site I/O is used for collecting status signals and operating parameters of on-site equipment, and for controlling and operating on-site equipment.
