AC Low-Voltage Distribution Cabinet

• The ambient air temperature shall not exceed +40°C and shall not be lower than -5°C. The average temperature over any 24-hour period shall not exceed +35°C.

• For indoor installation and use. The altitude of the site of installation shall not exceed 2000 meters above sea level.

• The relative humidity of the ambient air shall not exceed 50% at a maximum temperature of +40°C and a higher relative humidity is permissible at lower temperatures (e.g., 90% at +20°C). Due consideration shall be given to the possible occasional occurrence of condensation as a result of temperature variations.

• The tilt angle during installation shall not exceed 5 degrees from vertical.

• The equipment shall be installed in a location free from severe vibration and impact, and where the electrical components will not be exposed to corrosive conditions.

• For any special customer requirements, consultation with the manufacturer is required.

◆ Main Circuit Schemes

The GGD cabinet series offers 129 main circuit schemes with a total of 298 variations (excluding derived schemes and variations resulting from changes in auxiliary circuit functions or control voltages).

Specifically:

• GGD1 Type: 49 schemes, 123 variations.

• GGD2 Type: 53 schemes, 107 variations.

• GGD3 Type: 27 schemes, 68 variations. These main circuit schemes were selected based on extensive feedback from design and user departments, with additional schemes included to meet the needs of power plants. The rated current has been increased up to 3200A, making the cabinets suitable for use with distribution transformers of 2000 kVA and below. Furthermore, to address reactive power compensation requirements, the GGJ1 and GGJ2 capacitor compensation cabinets have been designed, offering 4 main circuit schemes with a total of 12 variations.

◆ Auxiliary Circuit Schemes The auxiliary circuit designs are categorized into two parts: schemes for power supply/consumption and schemes for power plants. The GGD cabinets provide ample space for the installation of secondary components.

◆ Selection of Electrical Components

◆ Selection of Electrical CoThe GGD cabinets primarily utilize electrical components that are already capable of being mass-produced domestically, such as ME, DW15, DW17, DW45, CM1, and NM1 series devices. Adhering to the principles of economy and rationality, and while fully considering feasibility, some applicable older products like the DZ20 series are retained. Obsolete products are not selected.

• The HD13BX and HS13BX rotary - operated knife - switches ares

• The HD13BX and HS13BX rotary-operated knife-switches are specialized components designed specifically for the unique structure of the GGD cabinets. They modify the operating mechanism of standard switches while retaining the advantages of the older products, representing a practical and innovative type of electrical component.

• Should design departments need to specify newer, higher - pe

• Should design departments need to specify newer, higher-performance, or more technologically advanced components based on user requirements, the flexible design of the GGD cabinets generally prevents significant manufacturing or installation difficulties arising from such component updates.

◆ Structural Features 

• To further enhance the dynamic withstand capacity of the main circuit, the cabinets are equipped with specialized ZMJ type combined busbar clamps and insulated supports. 

• The busbar clamps are thermoplastic molded from high-strength, high flame-retardant PPO alloy material. They feature high insulation strength, excellent self-extinguishing properties, and a unique structure. They can be easily configured as either single or double busbar clamps simply by adjusting modular spacer blocks. 

• The insulated supports feature a sleeve-type molded structure, offering low cost and high strength, effectively overcoming the issue of insufficient creepage distance found in older products.