en.Wedoany.com Reported - The power for every high-speed railway station comes from substations. Taking Changsha South Railway Station in China as an example, the power supply for this major high-speed rail hub is provided by the Bianshan Traction Substation.

A substation, as the name suggests, is a place where voltage is transformed. It is a facility within the power system for converting, concentrating, and distributing the voltage and current of electrical energy. The Bianshan Traction Substation is known as the "kinetic heart" of Changsha South Railway Station, undertaking the tasks of "traction power supply" and "electric power distribution."

Here, there is no bustling crowd; only neatly arranged cables, stably operating transformers, and a few small buildings with white walls and blue roofs.

Traction Power Supply: The Bianshan Traction Substation receives 220 kV high-voltage electricity from the external grid. This is stepped down to a dedicated voltage of 2 × 27.5 kV by single-phase traction transformers, and then transmitted via feeder lines.

The power is continuously supplied to the arrival and departure tracks of the Wuguang and Hukun yards at Changsha South Railway Station, as well as the maintenance depot of the Changsha EMU Depot. The starting and smooth acceleration of every EMU train are closely related to the stable delivery of this electric current.

Electric Power Distribution: The lighting, air conditioning, elevators, information screens, PA systems, ticket gates, and other power-consuming facilities at Changsha South Railway Station require 380V/220V "domestic electricity." The Bianshan Traction Substation is equipped with power transformers rated at 25,000 kVA, providing a 10 kV continuous power supply to the station and the lines along its route.

As a vital hub connecting the Beijing-Guangzhou and Shanghai-Kunming High-Speed Railways, Changsha South Railway Station has 13 platforms and 28 tracks. During peak passenger seasons, the station can handle over 750 EMU trains arriving and departing daily, serving more than 500,000 passengers boarding and alighting.

Whether it's the trains speeding along or the brightly lit waiting halls, the electricity behind it all is continuously transmitted from the Bianshan Traction Substation.

"Since it opened in 2009, it has been staffed around the clock with two people on duty." Huang Jia, an operator from the Changsha Power Supply Section of China Railway Guangzhou Group Co., Ltd., has worked at the Bianshan Traction Substation for over a decade. Day after day, she and her colleagues patrol the equipment, record meter readings, listen to the sound of the transformers, and identify every system message on the monitoring screens. Behind the warm lights of countless homes and the safe journeys of travelers, it is the silent dedication of these railway workers that safeguards the trains as they travel afar.

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