GDF Fixed-Partition Low-Voltage Switchgear

I. Structural Design Features

1. Independent Modular Structure: Employing an independent modular design comprising horizontal busbar compartments, vertical busbar compartments, functional unit compartments, and cable compartments. Each compartment is sealed and separated by steel plates or insulating panels, effectively preventing accident propagation and enhancing safety.

2. Compact and Flexible Layout: The structure is compact, highly versatile, and offers flexible assembly. Unit spacing can be freely configured to meet diverse design requirements.

3. Functional Unit Compartments, Busbar Compartments, and Cable Compartments are mutually independent, preventing interference and limiting the scope of potential faults.

4. The horizontal main busbar is arranged horizontally at the rear of the cabinet, enhancing the rated peak withstand current capacity.

5. Standardised and modular design: Cabinet frames utilise C-section steel or extruded profiles assembled with modular hole patterns (e.g., 20mm, 25mm pitch), ensuring high component interchangeability and standardisation.

6. Functional units are available in heights of 220mm, 440mm, 660mm, etc., supporting customised configurations.

II. Performance and Reliability Features

1. High Protection Rating: Cabinet protection ratings achieve IP30, IP40, or IP41, effectively preventing dust and moisture ingress for harsh environment suitability.

2. Independent access doors for each functional unit, with rear maintenance doors. All functional unit doors and main switches incorporate mechanical interlocking devices to enhance electric shock protection reliability.

3. Robust Electrical Performance: High breaking capacity, strong making capability, and excellent dynamic thermal stability to meet high-current demands.

4. Vertical busbars are assembled within high-strength flame-retardant plastic functional panels, providing arc-fault resistance for operational safety.

5. Rated current coverage spans 400A to 6300A, supporting both three-phase four-wire and three-phase five-wire systems.

6. Optimised thermal management: Ventilation openings at cabinet top and bottom create natural airflow channels, facilitating efficient heat dissipation through rising hot air and incoming cool air circulation.

III. Safety and Maintenance Features

1. Secure component design: Utilises withdrawable or plug-in circuit breakers (e.g., Schneider, Siemens, ABB brands), minimising intermediate mechanisms to reduce failure rates.

2. Fixed-mounted air circuit breakers employ plug-in configurations with additional operating handles on doors, combining the advantages of draw-out cabinets with the stability of fixed enclosures.

3. Convenient Maintenance and Replacement: Component replacement is straightforward, requiring only the substitution of the switch body without system power interruption.

4. Drawer unit circuit breakers are fixed-mounted, while fixed compartment circuit breakers are either fully withdrawable or plug-in types. Circuit breaker bodies of identical specifications and parameters are interchangeable, facilitating maintenance.

Multi-industry coverage

IV. Normal Operating Environmental Conditions

1. Ambient air temperature shall not exceed +40°C nor fall below -5°C, with an average temperature not exceeding +35°C over a 24-hour period.
2. Atmospheric conditions: Clean air with relative humidity not exceeding 50% at a maximum temperature of +40°C. Higher relative humidity is permissible at lower temperatures, e.g., 90% at +20°C, provided the potential for occasional condensation due to temperature variations is accounted for.

3. Altitude not exceeding 2000 metres.
4. Transport and storage temperature range: -25°C to +55°C, with brief exposure (not exceeding 24 hours) permissible up to +70°C. At these extreme temperatures, the unit shall not sustain irreversible damage and must remain operational under normal conditions.
5. Should the aforementioned operating conditions prove unsatisfiable, resolution shall be determined through consultation between the user and manufacturer.
6. For deployment on offshore oil drilling platforms or nuclear power stations, a separate technical agreement shall be executed.