What Are the Functions and Advantages of Deyan GGD Low-Voltage Switchgear?

Among the myriad models of low-voltage switchgear, one name stands out prominently: GGD. As one of the most widely adopted models in China's low-voltage distribution sector, GGD switchgear has witnessed the nation's industrialization journey. To this day, it continues to safeguard electrical safety in countless factories, buildings, and infrastructure projects.

1.1 What is GGD?

GGD stands for “Fixed-Type, Cabinet-Style, Power-Use” low-voltage distribution cabinet. Specifically:

- First G: Represents “Fixed-Type,” indicating electrical components are permanently installed within the cabinet and cannot be withdrawn.

- The second G: Stands for “Cabinet Structure,” indicating a fully enclosed cabinet body

- D: Stands for “Power Use,” primarily employed for electrical power distribution

The GGD low-voltage switchgear was born in the 1990s as a nationally standardized product designed and developed under the guidance of the then Ministry of Machinery and Electronics Industry. Its introduction aimed to replace outdated series like BSL and BDL, unify technical standards, and enhance product quality and interchangeability.

1.2 Why Enduring Popularity?

Despite the emergence of new switchgear types over three decades, GGD remains a dominant choice. Why?

Classic Design: GGD features rational structural layout and clear functional zoning, aligning with Chinese user preferences.

Reliable Performance: Long-term market validation has established GGD's electrical performance and mechanical reliability as widely recognized.

Maintenance Ease: While fixed structures offer less flexibility than draw-out types, their simplicity reduces failure points and enables intuitive maintenance.

Cost Advantage: Compared to draw-out switchgear, GGD boasts lower manufacturing costs and outstanding cost-performance.

High Standardization: Nationally unified design ensures good interchangeability among products from different manufacturers.

2.1 Overall Structure

GGD switchgear adopts an indoor enclosed structure, typically rectangular in shape, comprising the following components:

Cabinet Frame: Constructed from high-quality cold-rolled steel plates or aluminum-zinc coated steel plates bent into shape, forming the cabinet's skeleton. Components are securely fastened with screws to create an integrated structure.

Top Cover and Side Panels: Enclose the top and sides of the cabinet, providing protective functions. The top cover is typically removable to facilitate busbar installation.

Door Panels: The front of the cabinet features doors. The instrument door houses indicating instruments and operating buttons, while the lower door provides access for maintenance.

Rear Cover Plate: A removable cover plate at the rear facilitates cable connections and maintenance.

Partition Panels: Internal partition panels are installed as needed to separate the busbar compartment, functional unit compartment, and cable compartment, enhancing safety.

2.2 Functional Zones

The interior of a GGD cabinet is typically divided into three main functional zones:

Busbar Compartment: Located at the top of the cabinet, it houses the three-phase main busbars. The busbars, made of copper or aluminum, are supported and secured by insulators.

Functional Unit Compartment: Positioned in the middle section, it accommodates various low-voltage electrical components such as frame circuit breakers, molded case circuit breakers, contactors, thermal relays, and knife switches. These components are mounted on installation panels and secured within the cabinet after wiring.

Cable Compartment: Located at the bottom of the cabinet, it accommodates incoming and outgoing cables. Cables connect to the upper circuit breakers via copper busbars or cable heads, while the cables themselves are secured to cable supports.

2.3 Key Features

1. Excellent Heat Dissipation

The GGD cabinet thoroughly addresses heat dissipation requirements for high-current operation. Ventilation openings at both the top and bottom of the cabinet utilize the principle of air convection to create natural ventilation channels for heat dissipation. For high-capacity cabinets, this natural ventilation design effectively reduces internal temperature rise.

2. Moderate Protection Rating

The standard protection rating for GGD cabinets is IP30, preventing solid objects larger than 2.5mm in diameter from entering. This meets the requirements for general indoor environments. For special environments, the protection rating can be upgraded.

3. Easy Installation and Maintenance

The GGD features a fixed structure with all components mounted on installation panels, ensuring clear visibility of wiring. During maintenance, components can be accessed directly without special tools, offering intuitive and convenient operation.

4. High Standardization

GGD cabinets adhere to unified standards for dimensions, mounting hole spacing, and busbar positioning. Products from different manufacturers offer excellent interchangeability, simplifying engineering design and equipment replacement.

2.4 Model Designation Meaning

GGD is typically followed by numeric codes indicating specifications:

- GGD1: 15kA breaking capacity, primarily used in applications with smaller transformer capacities

- GGD2: 30kA breaking capacity, the most widely used model

- GGD3: 50kA breaking capacity, used in high-capacity systems

For example, GGD2-36C denotes a GGD2-type switchgear with scheme number 36 and auxiliary circuit code C.

3.1 Factory Power Distribution

GGD is most commonly found in transformer rooms and workshop power distribution systems across various factories. Serving as the main distribution cabinet, it receives low-voltage power from transformers and distributes it to workshop distribution cabinets or directly supplies large equipment.

3.2 Building Electrical Systems

In the power distribution systems of commercial complexes, office buildings, and residential communities, GGDs are commonly used as main incoming feeders, bus tie switchgear, and control cabinets for large equipment such as air conditioning units, water pumps, and elevators.

3.3 Infrastructure

GGDs also play a vital role in public facilities like airports, stations, hospitals, and schools, providing reliable power distribution for lighting, air conditioning, and various power loads.

3.4 Renovation Projects

In numerous retrofit projects for aging distribution rooms, GGD cabinets are frequently selected as the ideal replacement for outdated switchgear due to their standardized dimensions and ease of installation.

4.1 Deyan Electric's GGD Products

In the field of GGD switchgear manufacturing, Deyan Electric has earned widespread market recognition for its meticulous craftsmanship and reliable product quality.

Deyan Electric's GGD switchgear builds upon classic designs with multiple optimizations:

Cabinet Craftsmanship Upgrade: Deyan employs advanced CNC machining equipment, achieving high bending precision and uniform assembly gaps for enhanced aesthetics. Surfaces undergo multiple processes including degreasing, rust removal, phosphating, and spraying, resulting in strong coating adhesion and excellent corrosion resistance.

Rigorous Component Selection: Deyan insists on using core components like circuit breakers and contactors from renowned domestic and international brands to ensure reliable electrical performance. Multiple configuration options are provided based on customer needs, accommodating varying budgets and performance requirements.

Precision Busbar Processing: Deyan utilizes specialized busbar processing equipment, achieving one-step forming for copper busbar bending, punching, and blanking. Surfaces are insulated with heat-shrink tubing or epoxy coating, ensuring both aesthetics and safety.

Meticulous Craftsmanship: From secondary wiring to component installation, every Deyan technician undergoes rigorous training to ensure precise execution of manufacturing standards. Internal wiring harnesses are neatly organized with clear labeling, significantly facilitating future maintenance and inspections.

4.2 Why Choose Deyan Electric's GGD?

Reliable Quality: Every process—from raw material intake to finished product shipment—undergoes stringent inspection to guarantee compliance with national standards and design specifications.

Comprehensive Service: Deyan provides end-to-end support from design solutions and equipment manufacturing to on-site guidance, ensuring worry-free operation for users.

High Cost-Effectiveness: While maintaining quality, Deyan controls costs through lean production and refined management, delivering products with outstanding value.

Rapid Response: Deyan's flexible production system enables swift handling of urgent customer requests, guaranteeing timely project delivery.

5.1 Installation Guidelines

Foundation Preparation: Switchgear must be installed on a level foundation. Structural steel foundations should be horizontal, with deviations within permissible limits.

Cabinet Positioning: Handle cabinets with care during hoisting to prevent impact damage. Secure cabinets firmly to the foundation after positioning. Adjust horizontal and vertical alignment when installing multiple units side-by-side.

Busbar Connection: Ensure clean contact surfaces during main busbar connection. Apply conductive grease and tighten bolts to specified torque.

Cable Connection: Secure cables entering the cabinet reliably. Verify correct phase sequence and meet required bending radius.

5.2 Operational Maintenance

Daily Inspection: Verify normal instrument readings, check for abnormal sounds or odors, and monitor cabinet temperature for overheating.

Periodic Cleaning: After power disconnection, clean the cabinet interior to maintain clean insulation surfaces and prevent pollution flashovers.

Tightening Inspection: Regularly inspect busbar connection bolts and component mounting bolts to ensure secure fastening.

Component Maintenance: Perform maintenance and testing on components such as circuit breakers and contactors according to the instruction manual.

Conclusion: Classics Never Go Out of Style

In the low-voltage power distribution field, new products emerge constantly and technology advances rapidly. Yet GGD switchgear, with its classic design, reliable performance, and economical cost, continues to hold an irreplaceable position.

It may lack the flexibility of withdrawable switchgear or the technological sophistication of smart distribution systems, but it is precisely this unassuming reliability that makes it the backbone of countless distribution rooms.

Companies like Deyan Electric breathe new life into this classic product through meticulous craftsmanship and continuous improvement. Regardless of how times change, electricity remains the lifeblood of industry. GGD switchgear, safeguarding power safety, will continue to quietly write its own legend in the corner of distribution rooms.

If you are planning a power distribution system, consider this market-proven classic. Choose a trusted manufacturer—Deyan Electric—to provide solid assurance for your electrical safety.