Integrated Electrical Design Solution for Metro Project

I. Project Overview

Located in Xinhhu Sub-district, Guangming District, this Shenzhen Metro project is an integrated development integrating residential, commercial, office, and public supporting facilities, with 753 planned parking spaces. It needs to meet diverse electricity demands including residential living, business operations, office use, and charging pile supporting services. Guided by the core principles of “zone adaptation, safety and reliability, intelligence and efficiency”, we have tailored a full-scenario electrical design solution to lay a solid energy foundation for the high-quality operation of the project.

II. Core Challenges

Diverse Formats: Covering residential, commercial, office, and public supporting scenarios with significant power density differences (7kW/unit – 250W/㎡) and complex power supply requirements.
Charging Pile Supporting: Required to construct 238 slow-charging piles (7kW each) with 100% reserved installation conditions, demanding an independently planned power distribution system.
High Safety Standards: As an integrated building complex, it must comply with multiple safety specifications such as fire linkage, emergency power supply, and civil air defense requirements in wartime.
Difficult Spatial Planning: The concentrated layout of multiple formats requires scientific planning of power distribution room locations and pipeline routes to balance functional needs and space efficiency.

III. Customized Solutions

Dual-Circuit Power Supply Guarantee to Eliminate Interruption RisksAdopt the architecture of “municipal high-voltage dual circuit + emergency generator”: Municipal high-voltage dedicated lines are connected to ensure stable daily power supply; one 800kW diesel generator is configured as the emergency backup power source to guarantee uninterrupted power for critical loads such as fire-fighting equipment and public core facilities; two 250kW generators are installed in the civil air defense area to meet power demands during wartime.
Zoned Power Distribution Design for Precise Format Adaptation

Power Distribution Room Planning: Exclusive power distribution rooms are set up by format, including residential (2×1250kVA), commercial (2×800kVA), office (2×1250kVA), charging piles (1×630kVA, with 1×1250kVA reserved), and bus station (800kVA). The high-voltage switch room is located in the semi-basement with a scientific and reasonable layout.
Charging Pile Supporting: An independent transformer is configured to supply power to 238 charging piles via dedicated lines. Meanwhile, equipment rooms and installation conditions are reserved to meet future expansion needs.
Power Distribution Method: Low-voltage distribution trunk lines divide outgoing circuits by format. Total metering devices are separately installed for residential and public loads, and independent metering devices are configured in terminal boxes to achieve precise management and control.

Comprehensive Safety Protection and Intelligent Operation & Maintenance Management

Automatic Fire Alarm System: A centralized alarm system is adopted, covering 11 major systems including detection and alarm, linkage control, and emergency broadcasting. The fire control room (located on the first floor, approximately 100㎡) implements centralized management and control, complying with the specification GB51309-2018.
Intelligent Protection: Equipped with electrical fire monitoring, fire equipment power monitoring, and fire door monitoring systems to realize real-time early warning of safety risks.
Pipeline Planning: Pipeline routes are planned following the principle of “fewer bends, closer to loads” to avoid back-and-forth power supply and pipeline conflicts, improving power supply efficiency.

Precise Equipment Selection with Reserved Expansion SpaceEquipment is accurately selected based on the load requirements of different formats: Transformer capacity is configured according to the peak load of each format with sufficient redundancy reserved; the high-voltage side adopts a ring network power supply mode, and the low-voltage side is equipped with dedicated switchgear. All power distribution rooms reserve equipment installation space to meet future functional expansion needs.

IV. Project Value

Safety and Reliability: Dual-circuit power supply + emergency generators + comprehensive fire protection meet multiple needs including daily operation, emergency support, and civil air defense in wartime.
Strong Adaptability: Zoned power distribution precisely matches the electricity needs of diverse formats. Independent planning of charging piles balances current use and future expansion.
High Efficiency and Energy Saving: Scientific pipeline planning and equipment selection reduce energy consumption losses. The intelligent monitoring system improves operation and maintenance efficiency and reduces labor costs.
Benchmark Demonstration: Provides a replicable solution for the electrical design of integrated building complexes, achieving a perfect balance between format adaptation, safety guarantee, and space utilization.

V. List of Key Equipment

Dry-type transformers, high-voltage switchgear, low-voltage switchgear, diesel generators, charging piles, fire alarm controllers, emergency lighting controllers, cable lines, enclosed busbars, electrical fire monitoring equipment, etc.