1、 Overview and purpose:
The GGD type AC low-voltage distribution cabinet is a new type of distribution cabinet designed based on the requirements of the competent authorities of the Ministry of Energy, power users, and design departments, in accordance with the principles of safety, economy, rationality, and reliability. The product has high breaking capacity, good dynamic and thermal stability, flexible electrical scheme, easy combination, strong series and practicality, novel structure, and high protection level. It can be used as a replacement product for low-voltage switchgear. And it is widely applicable to power plants, power stations, factories, mines and other power users with AC 50Hz and rated working voltage of 380V. Used for the conversion, distribution, and control of electrical energy as power, lighting, and distribution equipment.
2、 Usage conditions:
1. The ambient air temperature shall not be higher than+40 ℃ and not lower than -5 ℃;
2. Indoor installation and use, the altitude of the usage location shall not exceed 2000m;
3. The relative humidity of the surrounding air should not exceed 50% at a maximum temperature of+40 ℃, and a higher relative humidity is allowed at lower temperatures. (For example, 90% at+20 ℃) should take into account the possibility of occasional condensation due to temperature changes;
4. The inclination of the equipment during installation with respect to the vertical plane shall not exceed 5%;
5. The equipment should be installed in a place without severe vibration and impact, as well as in a place where electrical components are not susceptible to corrosion.
Product Structure Features:
1. The shell is assembled by partial welding of 8MF cold-formed steel. There are installation holes arranged in modules of E=20mm and E=100mm on the framework to improve the versatility of product assembly. The panels and partitions are made of high-quality cold-rolled sheets and undergo acid pickling, phosphating, electrostatic spraying, and anti-corrosion processes. The cabinet color is specified by the user. The internal treatment of the cabinet adopts hot-dip galvanizing process. To enhance ventilation and heat dissipation, there are ventilation and heat dissipation holes at the bottom and top of the cabinet, which are covered with steel wire mesh to prevent small animals from entering. For the convenience of lifting, lifting rings are installed at the four corners of the cabinet top. Considering the use of cables for outgoing lines, knock off holes should be provided at the bottom of the cabinet, and wire sleeves that meet the size requirements of the construction drawing should be prepared.
2. The design of GGD cabinets fully considers the heat dissipation issues during cabinet operation. There are different numbers of heat dissipation slots on both ends of the cabinet. When the electrical components inside the cabinet heat up, the heat rises and is discharged through the upper slot. Cold air is continuously replenished into the cabinet through the lower slot, forming a natural ventilation channel from bottom to top in the sealed cabinet, achieving the purpose of heat dissipation.
3 The GGD cabinet is designed according to the requirements of modern industrial product styling, using the golden ratio method to design the cabinet body shape and the division dimensions of each part, which is beautiful and elegant, with a new look. The cabinet door is connected to the frame with a pivot hinge, which is easy to install and disassemble. The folded edge of the door is embedded with a mountain shaped rubber strip. When closing the door, the strip between the door and the frame has a certain compression stroke, which can prevent direct collision between the door and the cabinet, and also improve the protection level of the door. The instrument door equipped with electrical components is connected to the frame with multiple strands of soft copper coins. The installation components inside the cabinet are connected to the frame with rolling screws, forming a complete grounding protection circuit for the entire cabinet.
4. The main circuit design of GGD cabinet includes 129 schemes and a total of 298 specifications (excluding schemes and specifications derived from functional changes of auxiliary circuits and changes in control voltage).
Among them, there are 49 schemes and 123 specifications of GGD1 type
GGD2 model with 53 schemes and 107 specifications
GGD3 model with 27 schemes and 68 specifications
In addition, GGJ1 and GGJ2 capacitor compensation cabinets were designed to meet the needs of reactive power compensation, with 4 main circuit schemes and a total of 12 specifications.
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