GGD AC low voltage distribution switchgear

GGD AC low voltage distribution switchgear use:

GGD type AC G low-voltage distribution switchgear is suitable for power plants, substations, factories and mining enterprises and other power users AC 50Hz, rated working voltage 380V, rated working current to 3150A power distribution system, as power, lighting and distribution equipment power conversion, distribution and control purposes.

GGD type AC G current low-voltage distribution switchgear is a new type of low-voltage distribution switchgear designed according to the requirements of the superior in charge of the Ministry of Energy and the majority of power users and design departments, in line with the principles of safety, economy, reasonableness and reliability. The product has the characteristics of high breaking capacity, good dynamic and thermal stability, flexible electrical scheme, convenient combination, series, strong practicality, novel structure and high protection level, and can be used as a replacement product for low-voltage switchgear.

GGD type AC G current low-voltage power distribution switchgear complies with IEC 349 "low-voltage switchgear and control equipment", GB 2751 "low-voltage switchgear" and other standards.

GGD AC low-voltage power distribution switchgear use conditions:

◆ The ambient air temperature is not higher than +40 °C, not less than -5 °C, and the average temperature within 24h shall not be higher than +35 °C;

◆ For indoor installation and use, the altitude of the place of use shall not exceed 2000m;

◆ The relative humidity of the surrounding air does not exceed 50% at a high temperature of +40°C, and a larger relative temperature should be allowed at a lower temperature (such as 90% at +20°C) considering the effect of condensation that may occur occasionally due to temperature changes;

◆ The inclination of the equipment with the vertical plane does not exceed 5°;

◆ The equipment should be installed in places without severe vibration and impact and places where electrical components are not enough to corrode;

◆ When users have special requirements, they can negotiate with the manufacturer to solve them.

Electrical performance of GGD AC low voltage distribution switchgear:

Basic electrical parameters:

GGD AC low voltage distribution switchgear main circuit scheme:

The main circuit of the GGD switchgear is designed with 129 schemes, a total of 298 specifications (excluding the scheme and specifications derived from the functional change of the auxiliary circuit and the change of the control voltage).

Among them: GGD1 type 49 schemes 123 specifications

GGD2 type 53 solutions 107 specifications

GGD3 27 solutions 68 specifications

The main circuit scheme was selected with the opinions of the majority of design and use departments, and the scheme required by the power plant was increased. Rated current up to 3150A, suitable for 2000kVA and The following distribution transformers are selected. In addition, in order to meet the needs of reactive power compensation, GGJ 1 and GGJ2 capacitor compensation switchgears are designed, and there are 4 main circuit schemes, a total of 12 specifications.

Auxiliary circuit scheme:

The design of the auxiliary circuit is divided into two parts: power supply and power plant scheme, and there is enough space to install secondary components in the GGD switchgear, and it is also developed and developed

Dedicated LMZ3D current transformer to meet the needs of power plants and special users when attached with relay protection.

GGD AC low voltage distribution switchgear main busbar :

Considering the price ratio and the feasibility of replacing copper with aluminum, a single aluminum bus bar can be used when the rated current is 1500A and below, and a double copper bus bar can be used when the rated current is greater than 1500A.

The prototype is manufactured and passed the type test according to this regulation, and of course, the manufacturer can also replace the aluminum busbar with a copper busbar with the same ampacity.

The lap surfaces of the busbars are treated with tin enamel.

Electrical component selection

(1). GGD switchgear mainly adopts more advanced electrical components that can be mass-produced in China, and also fully considers the feasibility according to the principle of economy and reasonableness

Under the premise, some of the available old products such as DZ10D, DZ20, etc. are retained, and the obsolete products are not selected.

(2). HD13BX and HS13BX rotary operated knife switches are special components designed to meet the needs of the unique structure of GGD switchgears, which change the operation mode of the mechanism.

It retains the advantages of the old product and is a utility model electrical component.

(3). If the design department selects new electrical components with excellent performance and advanced technology according to the needs of users, because the GGD switchgear has good installation flexibility,

Generally, manufacturing and installation difficulties are not caused by the device components.

(4). In order to further improve the dynamic stability ability of the main circuit, a ZMJ type combined busbar clamp and insulation support for GGD switchgear are designed. Busbar clamp by high strength, high flame retardant PPO alloy material thermoplastic molding, high insulation strength, good self-extinguishing performance, unique structure, only need to adjust the building block type block can be easily combined into single busbar clamp or double busbar clamp, insulation support is sleeve molded structure, low cost, high strength, solve the old product creepage distance is not enough defects.

Structural characteristics of GGD AC low-voltage distribution switchgear:

(1). The switchgear body of GGD type AC low-voltage power distribution switchgear adopts the form of a general switchgear, the frame is assembled by local welding of 8MF cold-formed steel, and the frame parts and special supporting parts are supplied by the section steel designated production plant to ensure the accuracy and quality of the switchgear. The parts of the universal switchgear are designed according to the module principle and have 20 mounting holes. The high general coefficient can enable the factory to achieve pre-production, which not only shortens the production and manufacturing cycle, but also improves work efficiency.

(2). The GGD switchgear is designed to fully consider the heat dissipation problem in the operation of the switchgear. There are different numbers of heat dissipation slots at both ends of the switchgear, when the electrical components in the switchgear are heated, the hot gas rises and is discharged through the upper end slots, and the cold air is continuously replenished into the switchgear by the lower end slots, so that the sealed switchgear from bottom to top forms a natural ventilation channel to achieve the purpose of heat dissipation.

(3). In accordance with the requirements of modern industrial product modeling design, GGD switchgear adopts the golden ratio method to design the shape of the switchgear and the division size of each part, so that the whole switchgear is beautiful and generous, and the face is new.

(4). The switchgear door is connected to the frame with a hinge movable hinge, easy to install and disassemble, the folding edge of the door is embedded with a mountain-shaped rubber strip, when the door is closed, the embedded strip between the door and the frame has a certain compression stroke, which can prevent the door from colliding directly with the switchgear body, and also improves the protection level of the door.

(5). The instrument door equipped with electrical components is connected to the frame with a multi-strand soft copper wire, and the mounting parts in the switchgear are connected with knurled screws between the frame, and the whole switchgear constitutes a complete grounding protection system.

(6). The switchgear finish is made of polyester orange-shaped baking paint, which has strong adhesion, good texture, and the whole switchgear is matte color, avoiding the dazzling effect and creating a more comfortable visual environment for the personnel on duty.

(7). The top cover of the switchgear body can be removed when needed, which is convenient for the assembly and adjustment of the main busbar on site, and the four corners of the switchgear roof are equipped with lifting rings for lifting and shipment.

(8). The protection level of the switchgear is IP30, and users can also choose between IP20-IP40 according to the requirements of the use environment.