GGDGGD AC low-voltage power distribution equipment for power plants, substations, industrial enterprises and other power users of AC 50Hz, rated voltage 380V, rated current up to 3150A of the distribution system, as power, lighting and power distribution equipment, power conversion , distribution, and control purposes. GGD AC low-voltage distribution cabinet is in a safe, economical, reasonable and reliable design principles of new low-voltage distribution cabinet. Products with high breaking capacity, dynamic thermal stability, electrical program flexible combination of convenience, family, practical, novel structure, high level of protection. Low-voltage switchgear can be used as a replacement product. GGD AC low-voltage distribution cabinet meet IEC439 "Low-voltage switchgear and control equipment", GB7251 "Low-voltage switch equipment" and other standards. Two conditions: 1, the temperature not higher than + 40 ℃, not lower than -5 ℃. The average temperature within 24h shall not exceed + 35 ℃ 2, within the installation, use the site's altitude must not exceed 2000m 3, around the air relative humidity at the highest temperature is + 40 ℃ not more than 50%, allowing lower temperatures (for example + 20 ℃ 90%) have a greater relative humidity should take into account changes in temperature may occasionally affect coagulation fog. 4 with the manufacturer, when the device was installed and the vertical gradient of not more than 5 degrees 5, the equipment should be installed in the absence of severe vibration and impact areas, and not enough to corrode electrical components with 6 places, you have special requirements negotiated settlement. 3 Model and meaning: GGD □□□ G: AC low-voltage distribution cabinet G: electrical components fixed installation, fixed wiring D: power with cabinet □: design number 1, breaking capacity 15KA 2, breaking capacity 30KA, breaking capacity To 50KA □: main circuit code □: Auxiliary circuit scheme codenamed four main technical parameters 1, the main circuit of the main circuit program designed GGD cabinet 129 program, a total of 298 specifications (not including the auxiliary circuit function changes and changes in the control voltage The derived solutions and specifications): GGD1: 49 proposals. 123 specifications GGD2: 53 proposals. 107 specifications GGD3: 27 proposals. 68 specifications of the main circuit program is designed to solicit the views of the majority, the use of sector Selected , increasing the plants require solutions. Rated current to 3150A, for 2000KV following selection of distribution transformer. In addition, to meet the needs of reactive power compensation design GGJ1, GGJ2 capacitance compensation cabinet, whose main circuit 4, a total of 12 specifications. 2, the design of the auxiliary circuit auxiliary circuit scheme for the electricity sub-programs and plant program in two parts. GGD cabinet there is enough space to install the second element, while NLS also developed a special LMZ3D current transformer and power plants to meet specific user needs protection when attached. 3, the main bus and to take into account the price ratio of the feasibility of aluminum and copper, rated current 1500A and below when a single row of aluminum busbar, double copper busbar rated current greater than 1500A, prototype manufacturing plant this provision and by type testing. Production plant is also available upon request to aluminum bus carrying capacity of copper into the same bus. Lap surface lining of tin are used bus Process. 4, electrical components select A, GGD cabinet has been mainly domestic energy production of more advanced electrical components, such as MB, DZ20, DW15, etc., but also based on economic rationality, in full consideration of the feasibility of retaining the premise The old part of the available products such as DZ10, etc., the choice is not obsolete electrical components. B, HD13BX and HS13BX operated rotary knife switch is dedicated member NLS GGD cabinet to meet the needs of the unique structure and design, it has changed the way organizations operate, retains the advantages of the old product, is a utility model of electrical components . C, such as the design department based on user needs, the selection of better performance, more technologically advanced new electrical components, due to the installation of GGD has good flexibility, usually does not cause difficulties in the manufacture and installation of electrical components due to the update. D, in order to further enhance the ability of the dynamic stability of the main circuit, NLS designed the GGD cabinet dedicated bus Jiahe ZMJ type modular insulated support. Bus clip from high-strength, high alloy materials PPO flame retardant thermoplastic molding, high dielectric strength, good self-extinguishing properties and unique structure, simply adjust the inter-block building blocks can be easily combined into a single bus or dual bus clip clip, the insulating support is molded sleeve structure, low cost, high strength, to solve the old creepage distance is not enough product defects.