GGD type AC low-voltage distribution cabinet is suitable for power plants, substations, industrial and mining enterprises and other power users of 50Hz AC, rated working voltage 380V, rated working current 5000A power distribution system, as power, lighting and distribution equipment electric energy conversion, distribution and control….
The GGD type AC low-voltage power distribution cabinet is applicable to the power distribution systems with an AC frequency of 50Hz, a rated working voltage of 380V and a rated working current of 5000A for power users such as power plants, substations and industrial and mining enterprises. It is used for the conversion, distribution and control of electric energy of power, lighting and power distribution equipment.
The product has the characteristics of high breaking capacity, good dynamic and thermal stability, flexible electrical schemes, convenient combination, strong practicability, novel structure and high protection level. It can be used as a replacement product for low-voltage switchgear assemblies.
The GGD type AC low-voltage power distribution cabinet complies with standards such as IEC439 “Low-voltage switchgear and controlgear assemblies” and GB7251 “Low-voltage switchgear and controlgear assemblies”.
Model Meaning:
“G” stands for the AC low-voltage power distribution cabinet for power use, with electrical components fixedly installed and fixedly wired. It is followed by the code for the auxiliary circuit scheme, the code for the main circuit scheme and the design serial number indicating the breaking capacity (15kA, 30kA or 50kA respectively).
Normal Service Environment:
The ambient air temperature shall not be higher than +40 °C and not lower than -5 °C. The average temperature within 24 hours shall not exceed +35 °C. It is installed indoors and the altitude of the installation site shall not exceed 2000m. The relative humidity of the ambient air shall not exceed 50% when the temperature is relatively high at +40 °C, and a relatively higher relative humidity is allowed when the temperature is lower. (For example, it is 90% at +20 °C). The influence of accidental condensation due to temperature changes should be taken into account.
When the equipment is installed, the inclination with respect to the vertical plane shall not exceed 5°. The equipment should be installed in places without severe vibration and impact and where the electrical components will not be corroded. In case of special requirements from users, it shall be negotiated and resolved with the manufacturer.
Electrical Performance:
Basic Electrical Parameters:
| Model | Rated Voltage (V) | Rated Current (A) | Rated Short-circuit Breaking Current (kA) | Rated Short-time Withstand Current (1S) (kA) | Rated Peak Withstand Current (kA) |
| GGD1 | 380 | A 1000 | 15 | 15 | 30 |
| GGD1 | 380 | B 600 (630) | 15 | 15 | 30 |
| GGD1 | 380 | C 400 | 15 | 15 | 30 |
| GGD2 | 380 | A 1500 (1600) | 30 | 30 | 63 |
| GGD2 | 380 | B1000 | 30 | 30 | 63 |
| GGD2 | 380 | C600 | 30 | 30 | 63 |
| GGD3 | 380 | A3200 | 50 | 50 | 105 |
| GGD3 | 380 | B2500 | 50 | 50 | 105 |
| GGD3 | 380 | C 2000 | 50 | 50 | 105 |
Main Circuit Solutions
The main circuit of the GGD cabinet has 129 solutions and a total of 298 specifications (excluding the solutions and specifications derived from the functional changes of the auxiliary circuit and the changes in control voltage). Among them:
The main circuit solutions are compiled after soliciting opinions from a large number of design and user departments, and solutions required by power plants are added. The rated current is increased to 3200A, which is suitable for distribution transformers of 2000kVA and below. In addition, to meet the needs of reactive power compensation, GGGJ1 – GGJ2 capacitor compensation cabinets are designed. Their main circuits have 4 solutions and a total of 12 specifications.
Auxiliary Circuit Solutions
The design of the auxiliary circuit is divided into two parts: power supply and consumption solutions and power plant solutions. There is sufficient space in the GGD cabinet to install secondary components.
Selection of Electrical Components
The GGD cabinet mainly uses relatively advanced electrical components that can be mass – produced in China, such as ME, DW15, DW17, DW45, CM1, NM1, etc. At the same time, based on the principles of economy and rationality, and fully considering feasibility, some usable old products such as DZ20 are retained. Obsolete products are not selected.
The HD13BX and HS13BX rotary – operated knife switches are special components designed to meet the unique structure of the GGD cabinet. They change the operation mode of the mechanism, retain the advantages of old products, and are practical electrical components.
If the design department selects electrical components with better performance according to user needs, due to the good installation flexibility of the GGD cabinet, it generally will not cause difficulties in manufacturing and installation due to the update of electrical components.
To further improve the dynamic stability of the main circuit, the ZMJ – type combined busbar clamp and insulating support specially used for the GGD cabinet are equipped. The busbar clamp is thermoplastically formed from high – strength and high – flame – retardant PPO alloy material. It has high insulation strength, good self – extinguishing performance, and a unique structure. It is only necessary to adjust the building – block – style blocks to easily form a single – busbar clamp or a double – busbar clamp. The insulating support has a sleeve – type molded structure, which has low cost and high strength, and solves the defect of insufficient creepage distance of old products.
Structure Introduction
The cabinet body of the GGD – type AC low – voltage distribution cabinet adopts the form of a universal cabinet. The frame is locally welded and assembled with 8MF cold – formed steel. The frame parts and special supporting parts are supplied by the fixed – point steel – producing factory to ensure the accuracy and quality of the cabinet body. The parts of the universal cabinet are designed according to the modular principle and have 20 – module installation holes. The high universal coefficient enables the factory to carry out pre – production, which not only shortens the production and manufacturing cycle but also improves work efficiency.
When designing the GGD cabinet, the heat dissipation problem during the cabinet’s operation is fully considered. There are different numbers of heat – dissipation slots at both the upper and lower ends of the cabinet body. After the electrical components in the cabinet generate heat, the heat rises and is discharged through the upper – end slots, while cold air continuously enters the cabinet through the lower – end slots, forming a natural air duct from bottom to top in the sealed cabinet body to achieve the purpose of heat dissipation.
According to the requirements of modern industrial product styling design, the GGD cabinet uses the method of the golden ratio to design the appearance of the cabinet and the division dimensions of each part, making the whole cabinet beautiful and refreshing.
The cabinet door is connected to the frame with a rotating – shaft movable hinge, which is convenient for installation and disassembly. A mountain – shaped rubber – plastic strip is embedded at the folded edge of the door. When the door is closed, the embedded strip between the door and the frame has a certain compression stroke, which can prevent the direct collision between the door and the cabinet body and also improve the protection level of the door.
The instrument door with electrical components is connected to the frame with multi – strand flexible copper wires, and the installation parts in the cabinet are connected to the frame with knurled screws. The whole cabinet forms a complete grounding protection circuit. The surface of the cabinet body is spray – painted, which has strong adhesion and good texture. The whole cabinet presents a matte color, avoiding the dazzling effect and creating a more comfortable visual environment for the duty personnel. The top cover of the cabinet body can be removed when necessary to facilitate the assembly and adjustment of the main busbar on – site. There are lifting rings at the four corners of the cabinet top for lifting and shipping. The protection level of the cabinet body is IP30, and users can also choose between IP20 and IP40 according to the requirements of the use environment.
