Basic Introduction

The GGD type AC low-voltage switchgear was developed in 1991. The fixed wiring low-voltage switchgear is divided into GGD1, GGD2, and GGD3, with different segmented current capacities. (Hereinafter referred to as switchgear) It is used for power users such as power plants, substations, and factories and mines; in AC 50-60Hz, rated operating voltage 380V, rated operating current up to 3150A power distribution systems, it is used for power, lighting, and power distribution equipment for energy conversion, distribution, and control.

The product has high segmentation capability, good dynamic and thermal stability; novel and reasonable structure, practical electrical scheme, strong series and usability, and high protection level. It can be used as an updated product.

Conditions of Use

1. Ambient temperature not higher than +40℃, not lower than -5℃.

2. When the product is installed and used, the altitude of the installation location does not exceed 2000m.

3. The relative humidity of the surrounding air is not more than 90% (+25℃).

4. The equipment should be installed in places without violent vibration and impact, and places that will not cause corrosion of electrical components.

5. The relative humidity of the surrounding air should not exceed 5% at the highest temperature of 40 degrees, and a larger relative humidity is allowed at lower temperatures. The influence of condensation that may occasionally occur due to temperature changes should be considered.

6. The equipment is installed in places without violent vibration and impact, and places that will not cause corrosion of electrical components.

7. If the user has special requirements, they can negotiate with the manufacturer to resolve them.

Structural Features

1. According to the purpose, it is divided into: power receiving cabinet, busbar connecting cabinet, feeder cabinet, motor control cabinet, reactive power compensation cabinet, and lighting distribution cabinet.

2. Cabinet structure:

(1) The cabinet frame is made of 8MF cold-bent steel and locally welded and assembled. The frame has installation holes arranged according to E=20mm and E=100mm modules to improve the versatility of product assembly.

(2) The ZMJ busbar clamp, which is thermoplastically molded from high flame-retardant PPO material, has a building block structure, high mechanical strength, and high insulation degree.

The structure is for non-wall mounting.

(3) For cabinets with widths of 1000mm and 1200mm, the front uses a symmetrical double-door structure; for cabinets with widths of 600mm and 800mm, a whole-door structure is used. The back of the cabinet uses a symmetrical double-door structure.

(4) The cabinet door is connected to the frame with a galvanized pivot chain, which is convenient for installation and disassembly. There is a rubber strip at the folded edge of the door.

(5) The installation parts inside the cabinet and the frame are connected by a grounding knurled screw structure to form a complete grounding protection circuit.

(6) The top cover of the cabinet can be removed when needed, which facilitates the assembly and adjustment of the main busbars.

Installation Instructions

After the product arrives at the receiving location, the packaging should first be checked for completeness and damage. If problems are found, the relevant departments should be contacted to find the cause. Products that are not immediately installed should be placed in an appropriate place according to the regulations for normal use conditions.

1. Product installation: The product should be installed according to the installation diagram. The base channel steel and bolts are provided by the user. When installing the main busbar, the overlapping joints should be repaired, cleaned, and coated with neutral varnish or other measures, and then fastened with bolts.

2. After the product is installed, the following items should be checked and tested before putting it into operation.

A. Check whether the cabinet paint has peeled off, and whether the inside of the cabinet is dry and clean.

B. Whether the operating mechanism of the electrical components is flexible, there should be no jamming or excessive operating force.

C. Whether the on-off of the main electrical appliances is reliable and accurate, and whether the on-off of the auxiliary contacts is reliable and accurate.

D. Whether the instrument indication and mutual inductance changes and polarity are accurate.

E. Whether the busbar connection is good; whether the insulation support, installation parts, and accessories are installed firmly and reliably.

F. Whether the auxiliary contacts meet the requirements; whether the fuse melting core specifications are correct, whether the breaker and setting value meet the design requirements, and whether the operation is accurate.

G. Whether the circuit contacts meet the requirements of the electrical schematic diagram.

H. Whether the protection circuit system meets the requirements. I. Use a 500V megohmmeter to measure the insulation resistance, which must not be less than 1 megohm.

3. Precautions for Use

A. This product is a low-voltage switchgear that is not wall-mounted, single-sided (front) operation, and double-sided door maintenance. Only qualified professional personnel can enter for operation, inspection, and maintenance of the product's maintenance channels and doors.

B. After multiple operations of the air circuit breaker, the main contacts may be partially burned and carbon deposits may occur, increasing the contact resistance. The air circuit breaker should be regularly maintained and inspected according to its instruction manual.

Other Features

Strong applicability, wide selection of main components, many domestic and imported brand products are interchangeable.

Good installation flexibility. Even if the competent authorities forcibly eliminate certain products in the future, the GGD type cabinet will not cause installation problems due to the modification or update of components because of its good installation flexibility.

Components adopt modular standard design, with tooling installation holes, and a high degree of universality.

According to the current industrial product styling design requirements, the golden ratio method is used to design the cabinet and the dimensions of each part, making the entire cabinet beautiful and generous; a new look.

The GGD cabinet design fully considers the heat dissipation during cabinet operation. There are a different number of heat dissipation slots at the top and bottom of the cabinet. When the electrical components inside the cabinet generate heat, the heat rises and is discharged through the upper slots. Cool air is constantly replenished from the lower slots, creating a natural ventilation path from bottom to top within the sealed cabinet to achieve heat dissipation. The cabinet panel uses a spray-plastic process with strong adhesion and good texture. The entire cabinet has a matte tone to avoid glare, creating a more comfortable visual environment for the on-duty personnel. The cabinet top cover can be removed when needed, facilitating the assembly and adjustment of the main busbar on site. Lifting rings are installed at the four corners of the cabinet top for lifting and transportation. The overall protection level of the cabinet is IP30, but users can also choose between IP20 and IP40 according to the site environment.