I. Project Background

This project involves the office building of Guangxi Meiyijia Industrial Investment Co., Ltd., which includes a basement equipment room. As an office space for small and medium-sized enterprises, the project required the construction of a safe, reliable, and operationally convenient power distribution system to meet the daily power load demands for lighting, elevators, air conditioning, etc., while also considering space limitations and long-term power stability.

II. Customer Pain Points

Space Constraints: The basement equipment room requires a compact layout; traditional distribution equipment occupies large areas and is inconvenient for maintenance.

High Reliability Requirements: Office building power supply continuity directly impacts business operations, necessitating mitigation of risks like short circuits and overloads.

Operational Complexity: Lacking a professional electrical team, the equipment needs to facilitate easy daily inspection and fault handling.

Expansion Flexibility: Future load adjustments require reserved space for capacity expansion.

III. Solution and Product Application

Addressing the project requirements, a three-tier power distribution architecture was adopted:

High-Voltage Incoming Line Cabinet

Product: KYN28-12 Armored Withdrawable AC Metal-Enclosed Switchgear

Functionality:

Receives 10kV municipal power supply and distributes it to the transformer via the vacuum circuit breaker.

Full metal armored structure meets moisture protection needs in the basement (humidity ≤ 95%).

Mechanical interlock "five-prevention" design eliminates the risk of misoperation.

Trolley-type circuit breaker supports hot-swapping for rapid replacement during faults.

Low-Voltage Distribution Layer

Product: SWGCS-type Low-Voltage Withdrawable Complete Switchgear

Functionality:

Rated current 6300A, compatible with the 2500kVA transformer, handles the main distribution for the building's power and lighting loads.

Modular drawer units enable floor-by-floor circuit control; single-circuit power outage for maintenance does not affect overall operation.

Independent capacitor compensation cabinet ensures stable power factor.

Terminal Distribution Layer

Product: SWXL-21 Power Distribution Cabinet

Functionality:

Installed in vertical shafts on each floor for local distribution to offices and public areas.

Cabinet door integrates meters and buttons for real-time monitoring of branch circuit status.

Built-in triple protection (Circuit Breaker + Contactor + Thermal Relay) prevents motor overload damage.

IV. Customer Value

Safe and Reliable:

High-voltage cabinet pressure relief channels + low-voltage cabinet fully segregated design mitigate arc flash propagation risks.

Full system complies with GB7251, GB3906, and other national standards; passed acceptance by Guangxi Power Grid.

Space and Cost Savings:

Wall-mounted SWXL-21 cabinets and vertically arranged SWGCS cabinets save floor space in the basement.

Standardized components reduce long-term spare parts procurement costs.

Convenient Operation and Maintenance:

Drawer-type low-voltage units / front-access power cabinets allow quick replacement of faulty components without specialized tools.

KYN28 trolley position mechanical indication prevents access to live compartments.