GGD model low-voltage stationary complete switchgear applies to power users such as power plant, transformer substation and industrial and mining enterprises, and plays the role of power conversion, distribution and control of power equipment, illumination equipment and distribution equipment in power distribution system of frequency 50Hz, rated operating voltage 380V and rated operating current up to 3150A.
Environmental Conditions for Product Use
- Ambient air temperature should be no more than +40℃ and no less than -5℃, and average temperature within 24h should be no more than +35℃.
- Altitude should be 1000m, users of high altitude region should indicate altitude upon ordering, and the product can meet requirement of user for altitude below 4000m.
- Relative humidity of ambient air should be no more than 50% under the highest temperature +40℃, and larger relative humidity is allowed under low temperature (for example: 90% under temperature +20℃).
- he inclination from vertical plane should be no more than 5°upon installation of equipment.
- Equipment should be installed at location free from violent shock and impact, and location free from corrosion of electric appliance component.
- User can negotiate with manufacture to find out solution in case of special requirements.
Cabinet body of low-voltage stationary complete switchgear adopts general purpose cabinet, and framework is assembled through partial welding of molded section. Component of general purpose cabinet is designed as per modular theory, and is configured with 20mm modulus installation hole, and the general purpose factor is high; with adequate consideration of heat radiation in cabinet during operation, different quantity of heat radiation holes are configured on both top/bottom side of cabinet body. In accordance with modern industrial product shape design requirement, golden section ratio is adopted for design of cabinet body exterior and section dimension of all parts, so that overall appearance of cabinet is pretty and elegant. Cabinet door is connected with framework by rotating shaft type of moveable hinge, featuring convenient installation and dismantling. A reverse T-shape rubber strip is embedded on edge of door, the embedded strip between door and framework has certain compression travel upon closing of door, and can prevent direct impact between door and cabinet body, enhancing degree of protection of door. The instrument door installed with electric component is connected to framework by multi-strand flexible copper wire, knurled screw is used for connection between parts mounted in cabinet and framework, so that the entire cabinet constitutes an integrated grounding protection circuit. Cabinet roof can be dismantled if necessary for the sake of assembling and adjustment of main busbar on site, hoisting rings are installed at all four corners of cabinet roof for hoisting and loading. Degree of protection of cabinet body is IP30 and user can select between IP20～IP40 as per demand of environment.
Main Circuit Scheme
The main circuit of GGD cabinet is designed with 129 programs, totaling 298 specifications (excluding functional change of auxiliary circuit and program and specification derived from change of control voltage).
In which there are 46 programs and 123 specifications for GGD type 1; 49 programs and 107 specifications for GGD type 2; 24 programs and 68 specifications for GGD type 3.
Rated current is increased to 3150A, and applies to power distribution transformer of 2000kVA and below.
Furthermore, in order to adapt to demand of reactive compensation, GGJ1 and GGJ2 capacitance compensation cabinets have been designed, including 4 main circuit programs and totaling 12 specifications.
Auxiliary Circuit Scheme
Design of auxiliary circuit is divided into two parts of power supply program and power plant program. There is sufficient space in GGD cabinet for installation of secondary component, meanwhile, special LMZ3D model current transformer has been developed and researched to meet requirements of power plant and special user on configuration of relay protection.
Selection of Electric Component
1、GGD cabinet mainly adopts advanced electric components that have been regularly produced in China, such as ME, DZ20 and TW30, etc.
2、HD13BX and HS13BX model rotating operation knife switch is special component designed to meet special structural demand of GGD cabinet, it changes operation mode of mechanism while keeping advantages of old product, and is a electric component of utility model.
3、Where better performance and more advanced new type of electric components are selected as per user's demand, due to excellent installation flexibility of GGD cabinet, normally no trouble will be caused in term of manufacture and installation due to change of electric component model or manufacturer.
4、In order to further enhance dynamic stability of main circuit, special ZMJ combined type busbar clamp and insulation supporting parts are designed for GGD cabinet. Made of thermoplastic moulding of PPO alloy material featuring high strength and high flame resistance, busbar clamp features high insulation strength, excellent self-extinguishing character and special structure, single-busbar clamp or double-busbar clamp can be combined conveniently through adjustment of building block module. With sleeve type of die stamping structure, insulation support features low cost and high strength, and has solved the defect of insufficient creepage of old product.
Ordering Instructions
- Arrangement diagram of switch cabinet and floor plan of power distribution room
- Main circuit single wire system diagram and main busbar specification
- Schematic diagram of auxiliary circuit
- Model, specification and quantity of electric components in cabinet
- Degree of protection IP30 of cabinet enclosure or color of cabinet body
- Dimension of busbar duct in relation to cabinet body (excluding door thickness) and wall thickness
- Other special requirements that are not in compliance with normal usage conditions.
> SYSTEM PROJECTS
