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-The annual compound annual growth rate of urban rail transit is 22.10%, and high-speed rail has brought rail transit into a new era of rapid development. The length of China's urban rail transit operation has grown rapidly, and at the same time, lightning protection for rail transit
has also entered our topic.
According to the electromechanical equipment of urban rail transit, lightning and surge are analyzed for the possible damage path of the equipment. The main sources of harm are as follows:
1. Direct lightning strikes pass through the air-termination device (such as lightning rods, lightning protection belts, lightning protection nets, etc.) into the ground, causing the ground network ground potential to rise. The high voltage is introduced into the electronic equipment by the ground wire of the equipment, causing the ground potential to strike back.
2. When the lightning current enters the ground along the down-conductor, a magnetic field is generated around the down-conductor, and various metal tubes (lines) around the down-conductor are induced to generate overvoltage.
3. Lightning voltages and overcurrents from power lines and communication lines entering and exiting the building or computer room that are subject to direct lightning strikes or inductive lightning surge in along the line and invade electronic equipment.
4. Operation over-voltage impact caused by strong inductive or capacitive equipment startup and shutdown.
Lightning protection for rail transit is a basic, comprehensive and long-term task. It must be designed in accordance with the requirements of an integrated lightning protection system, and adhere to the guidelines of prevention first and safety first. At the same time, different protection measures should be taken according to the lightning level in the area, the different lightning protection areas where the equipment is located, and the system's anti-interference level against lightning electromagnetic pulses.
Rail transit lightning protection -Surge protectors limit the transient overvoltages that penetrate into power lines and signal transmission lines within the voltage range that the equipment or system can withstand, or discharge a strong lightning current into the ground to protect the protected equipment or system Not damaged by impact.