Product category: product center switch cabinet series product description: modular design, easy assembly, good scalability. Application scope and purpose: GGD AC low-voltage distribution cabinet is suitable for power plants, substations, factories and mining enterprises and other power users with AC 50 Hz, rated working voltage 380 V, rated working current to 6300 a distribution system, as power It is used for energy conversion, distribution and control of lighting and distribution equipment. GGD type AC low-voltage distribution cabinet is a new type of low-voltage distribution cabinet designed according to the requirements of the majority of power users and design departments and based on the principles of safety, economy, rationality and reliability. The products are characterized by high breaking capacity, good stability, flexible electrical scheme, convenient combination, strong seriality, practicability, novel structure and high protection level. It can be used as the replacement product of low voltage switchgear. GGD type AC low-voltage distribution cabinet conforms to gb7251.1-2005 / iec60439-1:1999 "low voltage switchgear and control equipment". Service conditions: 1. The ambient air temperature shall not be higher than + 40 ℃, not lower than - 5 ℃, and the average temperature within 24 hours shall not be higher than + 35 ℃. 2. For indoor installation and use, the altitude of the place of use shall not exceed 2000m. 3. The relative humidity of the surrounding air shall not exceed 50% when the maximum temperature is + 40 ℃, and larger relative humidity is allowed when the temperature is lower              ( For example, 90% at + 20 ℃. The effect of occasional condensation due to temperature change should be considered. 4. When the equipment is installed, the inclination with the vertical plane shall not exceed 5 degrees. 5. The equipment shall be installed in the place without severe vibration and impact, and the place where the electrical components are not corroded. 6. If users have special requirements, they can negotiate with the manufacturer.   Technical performance and characteristics: 1. Basic electrical parameters 2. Main circuit scheme the main circuit of GGD cabinet has 129 schemes, a total of 298 specifications (excluding the schemes and specifications derived from the functional changes of auxiliary circuits and control voltage changes), including 49 schemes and 123 specifications of ggdl, 53 schemes of ggd2, 107 schemes of ggd3   The main circuit scheme of 68 specifications is selected and compiled by soliciting the opinions of the majority of design and user departments, adding the scheme needed by the power plant. The rated current is increased to 3150A, which is suitable for 2000kVA and below distribution transformers. In addition, in order to meet the needs of reactive power compensation, ggj1 and ggj2 capacitor compensation cabinets are designed, with 4 main circuit schemes and 12 specifications in total. 3. The design of auxiliary circuit is divided into two parts: common scheme and power plant scheme. There is enough space in GGD cabinet to install secondary components. At the same time, a special lmz3d current transformer is developed to meet the needs of power plants and special users when they are equipped with relay protection. 4. Considering the price ratio and the feasibility of replacing copper with aluminum, the main bus adopts single aluminum busbar when the rated current is 1500A or below (according to the user's requirements). When the rated current is greater than 1500A, copper busbar shall be used. The bonding surface of bus is tinned. 5. The selection of electrical components a and GGD cabinets mainly adopts more advanced electrical components that can be mass produced in China, such as me, hsw1, hsm1, rmw1, rmm1, etc. at the same time, according to the principle of economy and rationality, some available old products, such as dz10, are retained on the premise of full consideration of feasibility, and obsolete products are not selected, According to the development of domestic components, advanced electrical components are selected. B. Hd13bx and hs13bx rotary operated knife switch are special components designed to meet the needs of the unique structure of GGD cabinet. They change the original operation mode of the mechanism and retain the advantages of the old products. They are a kind of practical and new electrical components. C. For example, when the design department selects new electrical components with better performance and more advanced technology according to the needs of users, because the GGD cabinet has good installation flexibility, it is generally not difficult to update the manufacturing and installation of electrical components. D. In order to further improve the dynamic stability of the main circuit, ZMJ type combined bus clamp and insulation support for GGD cabinet are designed. The bus bar clamp is made of high strength and flame retardant PPO composite material, which has the advantages of high insulation strength, good self extinguishing performance and unique structure. It can be easily combined into single bus bar clamp or double bus bar clamp by adjusting the building block type spacer. Insulation support is a sleeve type molding mechanism with low cost and high strength, which solves the defect of insufficient creepage distance of old products.   Structural features: 1. The body of GGD AC low-voltage distribution cabinet is in the form of general cabinet, and the frame is assembled by local welding of 8MF cold-formed steel. The frame parts and special supporting parts are supplied by the designated section steel manufacturer to ensure the accuracy and quality of the cabinet. The components of the general cabinet are designed according to the principle of modules, and there are 20 die mounting holes, so the general coefficient is high. It can make the factory produce. It not only shortens the production cycle, but also improves the work efficiency. 2. In the design of GGD cabinet, the problem of heat dissipation during the operation of the cabinet is fully considered. There are different numbers of heat dissipation slots at the upper and lower ends of the cabinet. When the electrical components in the cabinet are heated, the heat rises and is discharged through the upper slot, while the cold air is continuously supplied into the cabinet through the lower slot. The sealed cabinet forms a natural ventilation channel from bottom to top to achieve the purpose of heat dissipation. 3. According to the requirements of modern process product modeling design, GGD cabinet adopts the golden section ratio method to design the cabinet shape and the partition size of each part, so as to make the whole cabinet beautiful and generous. 4. The door of the cabinet is connected with the frame by a rotating shaft movable hinge, which is convenient for installation and disassembly. A mountain shaped rubber strip is embedded at the folding edge of the door. When opening the door, the strip between the door and the frame has a certain compression stroke, which can prevent the door from directly colliding with the cabinet, and also improve the protection level of the door. 5. The instrument door with electrical components is connected with the frame with multi strand soft copper wire, and the mounting parts in the cabinet are connected with the frame with knurled screws, forming a complete grounding protection circuit. 6. The top coat of the cabinet is made of polyester orange baking paint, which has strong adhesion and good texture. The whole cabinet is in sub gloss color, avoiding glare effect and creating a more comfortable visual environment for the personnel on duty. 7. The top cover of the cabinet can be removed when necessary to facilitate the assembly and adjustment of the main bus on site. The four corners of the cabinet top are equipped with lifting rings for lifting and shipping. 8. The protection level of the cabinet is IP30. Users can choose between IP20 and IP40 according to the needs of the environment.