As a core component of low-voltage power distribution systems, withdrawable switchgear demonstrates unique advantages in the rail transit sector due to its modular design, high reliability, and flexible maintenance. This article analyzes its technical principles and application value through typical cases such as the Shanghai Metro, Guangzhou Metro, and Shenzhen High-Speed Railway.

Metro System: Comprehensive Penetration from Power Distribution to Intelligent Operation and Maintenance

1.Shanghai Metro: Core Power Supply Hub for the Entire Line 

    A certain Shanghai Metro line uses Schneider Blokset withdrawable low-voltage switchgear as the power distribution center and motor control center, covering key equipment such as ventilation, air conditioning, elevators, and escalators. This switchgear achieves electrical safety through a three-zone isolation design (busbar area, functional unit area, and cable area). The drawer units use ±0.1mm high-precision guide rails to ensure that the contact resistance remains stable below 50μΩ after 10,000 insertions and removals. In terms of intelligent operation, it integrates a Profibus-DP bus interface, collects data from over 300 monitoring points in real time, achieves a fault early warning accuracy rate of 98%, and reduces annual downtime to less than 2 hours.

2.Guangzhou Metro: A Model of Space Optimization and Energy Efficiency Improvement

    A new Guangzhou Metro line deployed Blokset cabinets in substations and along the line’s distribution rooms, reducing the equipment’s footprint by 30% through a compact layout. The cabinets utilize low-resistance copper busbars (contact resistance ≤30μΩ) and active filters, reducing system energy consumption by 15% and saving over 2 million yuan in electricity costs annually. The modular design allows for on-demand expansion; for example, a transfer station initially configured with 12 functional units could later meet the power needs of newly added commercial areas by adding drawers, avoiding a complete overhaul.

3.Shenzhen Metro: Refined Energy Management in Commercial Areas

    In some Shenzhen Metro stations, commercial areas utilize Blokset cabinets for individual metering. Each shop’s power distribution drawer integrates a smart meter and remote control module. The operation and maintenance platform can monitor the electricity consumption curves of over 200 businesses in real time and automatically generate energy efficiency analysis reports. Data from 2024 shows that by dynamically adjusting lighting and air conditioning operation strategies, energy consumption per unit area in commercial areas decreased by 18%, and electricity bill disputes decreased by 70%.

High-Speed ​​Rail System: A Key Support from Traction Power Supply to Emergency Response

1.Beijing-Shanghai High-Speed ​​Railway: The Stable Cornerstone of Overhead Contact Line Power Supply

    At a traction substation on the Beijing-Shanghai High-Speed ​​Railway, GCK-type withdrawable switchgear undertakes the task of stepping down voltage from 35kV to 10kV. The cabinet is equipped with a dual-power automatic switching device, which, in the event of a main power line failure, activates the backup power supply within 0.3 seconds, ensuring continuous power supply to the overhead contact line. The drawer unit adopts a “five-proof” interlocking design (preventing accidental opening and closing, preventing closing while energized, preventing closing with ground wire, preventing accidental entry into energized compartments, and preventing pulling the knife switch under load), achieving a zero-misoperation record throughout 2024.

2.Xi’an East Railway Station: Innovative Practices in Relocation Projects

    During the construction of the Xi’an East Railway Station elevated expressway in 2025, the Xi’an East Railway Station Company utilized combiner cabinet technology to allocate 10 12,000 kW generator cars. Traditional distributed connections require eight connection points, while the combiner cabinet connects the load all at once via a centralized busbar, reducing the number of connection points to three. An intelligent load monitoring system is installed within the cabinet to adjust the generator car output power in real time, avoiding the risk of overload disconnection. During the relocation, a continuous power supply of 12,000 kWh was provided, ensuring zero power outages for 9,875 households.

    Heshan Electric Co., Ltd. offers a complete range of electrical equipment products. Our products are widely used in factories, enterprises, communities, data centers, and other settings. For common power distribution needs, Heshan Electric Co., Ltd. has mature design solutions, and for special power consumption scenarios, we also have advanced technology to provide customized services. Professional technical services and high-quality electrical products have earned Heshan Electric widespread praise among our customers.