GGD Fixed-Type Distribution Cabinet

Overview

The GGD low-voltage fixed-type complete switchgear (hereinafter referred to as the distribution cabinet) is designed for use in power systems—such as power plants, substations, industrial and mining enterprises—where it serves as equipment for converting, distributing, and controlling electrical energy. It operates on AC 50Hz (60Hz), with rated operating voltages of 380V (400V) or 660V, and can handle rated currents up to 3150A. This product boasts high breaking capacity, excellent dynamic and thermal stability, and a rated short-time withstand current of up to 50kA. Additionally, it features flexible electrical configurations, convenient and versatile assembly options, exceptional practicality, a novel structural design, and superior protection ratings. As one of China’s leading examples of modular, fixed-panel switchgear, this product sets a benchmark for reliability and performance in its class.

The distribution cabinet has undergone comprehensive type testing and is certified under the national mandatory 3C product certification. The product complies with standards such as GB 7251.12 "Low-Voltage Switchgear and Control Equipment" and IEC 60439-1 "Low-Voltage Switchgear and Control Equipment."

Model and Its Meaning

Normal operating conditions

1 Ambient air temperature not exceeding 40°C, with a 24-hour average no higher than 35°C, and a minimum ambient air temperature of -25°C;

2 The installation site must not exceed an altitude of 2000 meters.

3 The surrounding air is not noticeably contaminated by dust, smoke, corrosive or flammable gases, vapors, or salt spray.

4 Atmospheric Conditions: Air must be clean, and the relative humidity should not exceed 50% at a maximum temperature of +40°C. At lower temperatures, higher levels of relative humidity are permitted— for example, up to 90% at +20°C. However, it’s important to note that fluctuations in temperature may occasionally lead to mild condensation.

5. During equipment installation, the tilt angle relative to the vertical plane should not exceed 5°.

6. The equipment should be installed in a location free from severe vibrations and shocks.

Note: Users with special requirements may discuss solutions directly with our company.

Main technical specifications

Structural Features

The enclosure of the 1 GGD distribution cabinet adopts a universal cabinet design, with the frame fabricated by locally welding together 8MF cold-formed steel sections. All frame components and specialized matching parts are manufactured and supplied directly by our company, ensuring precise dimensions and superior quality for the cabinet. The universal cabinet’s components are designed based on modular principles, featuring 20 standardized mounting holes that maximize interchangeability and versatility. This design allows factories to streamline production processes, significantly reducing manufacturing lead times while boosting overall efficiency. Additionally, the cabinet’s exterior can be customized in color according to customer preferences, with a high-pressure electrostatic powder-coating finish measuring over 60μ in thickness.

The 2 GGD cabinet design thoroughly addresses the issue of heat dissipation during operation. The cabinet features varying numbers of ventilation slots at both the top and bottom ends. When electrical components inside the cabinet generate heat, it rises upward and is expelled through the upper slots. Meanwhile, cool air continuously flows in from the lower slots, creating a natural ventilation path that circulates from bottom to top within the sealed cabinet, effectively dissipating heat.

The 3 GGD cabinets are designed following the principles of modern industrial product styling, employing the golden ratio to determine the cabinet’s overall shape and the proportional dimensions of its various components—resulting in a cabinet that is both aesthetically pleasing, elegant, and uniquely innovative.

4 The cabinet doors are connected to the frame using pivoting, adjustable hinges that allow for easy installation and removal. A mountain-shaped, foam-filled rubber-plastic strip is embedded along the outer edges of the door folds; when the door is closed, this strip compresses slightly, preventing direct impact between the door and the cabinet frame while also enhancing the door's overall protection level.

5 The instrument doors, fitted with electrical components, are connected to the frame using multi-strand flexible copper wires, which are then linked to the grounding busbar. Inside the cabinet, mounting hardware is secured to the frame via knurled washers, ensuring that the entire cabinet forms a complete grounding protection system.

6. The cabinet surfaces are treated with a high-pressure electrostatic powder coating process, offering excellent adhesion and a premium tactile finish. The entire cabinet features a matte-toned finish that effectively eliminates glare, creating a more comfortable visual environment for on-duty personnel.

The top cover of the cabinet can be removed when needed, making it easy to assemble and adjust the main busbar on-site. Four lifting loops are installed at the four corners of the cabinet top for hoisting and transportation.

8 Auxiliary Circuit Schemes

The design of the auxiliary circuit is divided into two parts: the power supply and consumption plan, and the power plant plan.

9 Main Busbar

Considering the cost-effectiveness and the feasibility of using aluminum instead of copper, single aluminum busbars are typically used for nominal currents of 1600A and below. For nominal currents exceeding 1600A, dual copper busbars are employed. Alternatively, aluminum busbars can also be replaced with copper busbars of equivalent current-carrying capacity, as per the customer’s requirements. All busbar connection surfaces undergo a tinning process to ensure optimal performance and durability.

10 Electrical Component Selection

a. The GGD cabinet primarily uses advanced electrical components that are already available in mass production domestically. For frame circuit breakers, options include Emax and CW1, with MT and TRWI also available upon request. As for molded-case circuit breakers, the selection includes advanced domestic and international models such as NSX, Tmax, CMI, and TRM.

b. The HDI3BX and HSI3BX rotary-type knife switches are specialized components designed specifically to meet the unique structural requirements of GGD cabinets. They feature a redesigned operating mechanism while retaining the advantages of previous models, making them a practical new-generation electrical component.

c. When the design department selects new electrical components with superior performance and more advanced technology based on user needs, the GGD cabinet’s excellent installation flexibility typically ensures that updating these components won’t create significant manufacturing or installation challenges.

d. To further enhance the dynamic stability of the circuit, the GGD cabinet’s busbar supports utilize specialized ZMJ-type modular busbar clamps and insulating components. The busbar clamps are thermoformed from a high-strength, highly flame-retardant PPO alloy material, offering excellent insulation performance, self-extinguishing properties, and a unique design that allows for easy assembly into either single- or double-busbar configurations simply by adjusting the interlocking block sections. Meanwhile, the insulating supports feature a sleeve-type compression-molded structure, which not only reduces costs but also delivers superior strength—effectively addressing the previous product’s limitation in insufficient creepage distance.

The enclosure of Cabinet 11 has a protection rating of IP30 or IP40, and users can also choose between IP20 and IP40 depending on their specific environmental requirements.

External Structure and Installation Dimensions

Product Completeness

The following documents and attachments should be provided upon delivery:

1 Certificate of Qualification;

2 Packing lists;

3 User Manual;

4 Factory Inspection Report:

5 Regarding electrical drawings;

6 Cabinet door keys and operating handles—spare parts specified in the contract;

Ordering Instructions

The following information should be provided when placing an order:

1 Main circuit system schematic diagram;

2. Auxiliary Circuit Electrical Schematic;

3. List of components inside the cabinet (including component model, name, specifications, and quantity);

4 Switchgear Layout Plan:

5 Cabinet color (if no specific request, supplied according to our company's standard);

6. List of Required Spare Parts

7. Other special requirements that do not align with the product's normal use.