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China GGD Low Voltage Fixed Switchgear Suppliers - Reliable AC Distribution Cabinets for Factories and Power Plants
Model and Definitions
Application Conditions
The ambient air temperature is not higher than +40℃ and not lower than -5℃. The 24h average temperature inside shall not be higher than +35℃.
For indoor installation, the altitude of the location where it is used shall not exceed 2000m.
The relative humidity of the surrounding air should not exceed 50% when the maximum temperature is +40℃. A higher relative humidity is allowed at lower temperatures (e.g. 90% at +20℃), considering condensation from temperature changes.
The equipment should be installed with an inclination of no more than 5° from the vertical plane.
The equipment should be installed in a place without severe vibration and impact, and where electrical components are not easily corroded.
If users have special requirements, they can negotiate with the manufacturer to resolve them.
Electrical Performance
Basic electrical parameters
| Model | Nominal Voltage (V) | Rated Currency (A) | Rated short circuit breaking Current (kA) | Rated short-time withstand current (1s) (kA) | Rated peak withstand current (kA) | |
|---|---|---|---|---|---|---|
| GGD1 | 380 | A | 1000 | 15 | 15 | 30 |
| B | 600 (630) | |||||
| C | 400 | |||||
| GGD2 | 380 | A | 1500 (1600) | 30 | 30 | 63 |
| B | 1000 | |||||
| C | 600 | |||||
| GGD3 | 380 | A | 3150 | 50 | 50 | 105 |
| B | 2500 | |||||
| C | 2000 | |||||
Main circuit scheme
The main circuit of the GGD cabinet has 129 design schemes and a total of 298 specifications (excluding schemes and specifications derived from functional changes in auxiliary circuits and changes in control voltage).
in: GGD1 Type 49 plans 123 specifications; GGD2 Type 53 plans 107 specifications; GGD3 Type 27 plans 68 specifications.
The main circuit scheme was selected after soliciting opinions from a wide range of design and user departments, and the scheme required by power plants was added. Rated Currency to 3150A, Suitable for 2000kVA and the following. In addition, in order to meet the needs of reactive power compensation, a GGJ1, GGJ2 Capacitor compensation cabinet has 4 main circuit schemes and a total of 12 specifications.
Auxiliary circuit solution
The design of auxiliary circuits is divided into two parts: power supply scheme and power plant scheme. GDJ There is enough space in the cabinet to install two Time components, and a special LMZ3D Type Current Transformers are used to meet the needs of power plants and special users for additional relay protection.
Main bus
Considering the price ratio and the feasibility of replacing copper with aluminum, the Rated Currency is 1500A Single aluminum busbar can be used when the rated currency is greater than 1500A Double copper busbars are used to produce. The factory manufactures the prototype according to this regulation and passes the type test. Of course, the manufacturer can also replace the aluminum busbar with a copper busbar with the same current carrying capacity according to the user's requirements. The overlapping surfaces of the busbars are all treated with tinning technology.
Electrical component selection
GDJ The cabinet mainly adopts the most advanced electrical components that can be mass-produced in China. At the same time, according to the principle of economy and rationality, some feasible ones are reserved under the premise of full consideration of feasibility. Use old products such as DZ10D, D220, etc., and do not choose obsolete products.
HD13BX and HS13BX rotary knife switches are special components designed to meet the unique structural requirements of GGD cabinets. They change the operation mode of the mechanism and retain the advantage of the old product is that it is a practical new type of electrical component.
If the design department selects new electrical components with better performance and more advanced technology according to user needs, the GGD cabinet generally will not be replaced due to the good installation flexibility. The device components cause difficulties in manufacturing and installation.
In order to further improve the dynamic stability of the main circuit, a ZMJ type combined busbar clamp and insulation support for GGD cabinets are designed. The busbar clamp is made of high-strength, high-flame-retardant PPO alloy material thermoplastic molding, with high insulation strength, good self-extinguishing performance, and unique structure. It can be easily combined into a single busbar or double busbar clamp by simply adjusting the building block. The insulation support is a sleeve-type molded structure with low cost and high strength, which solves the defect of insufficient creepage distance of old products.
Outside shape and installation dimensions
| Product Code | A | B | C | D |
|---|---|---|---|---|
| GGD06 | 600 | 600 | 450 | 556 |
| GGD06A | 600 | 800 | 450 | 756 |
| GGD08 | 800 | 600 | 650 | 556 |
| GGD08A | 800 | 800 | 650 | 756 |
| GGD10A | 1000 | 600 | 850 | 556 |
| GGD10A | 1000 | 800 | 850 | 756 |
| GGD12 | 1200 | 800 | 1050 | 756 |
Produce product Completeness
Our company provides the following documents and attachments when supplying goods:
Packing List
Product Certificate
User Manual
Factory test report
Related electrical drawings
Cabinet door keys, operating handles & spare parts
Frequently Asked Questions (FAQ)
Q1 What are the standard ambient temperature conditions for GGD switchgear cabinets?
The ambient air temperature must not exceed +40℃ and not fall below -5℃. In addition, the 24-hour internal average temperature must remain under +35℃.
Q2 What rated current capacities are available across the GGD models?
GGD1 supports rated currents from 400A to 1000A; GGD2 supports 600A to 1600A; and GGD3 supports up to 3150A, suitable for transformer capacities of 2000kVA and below.
Q3 How are the main busbars configured for different current ratings?
A single aluminum busbar is used for rated currents up to 1500A, while double copper busbars are configured for currents exceeding 1500A. Copper busbars can also be fully customized to user requirements. All busbar contact surfaces are treated with tinning technology.
Q4 What are the installation requirements regarding altitude and vertical inclination?
For indoor installation, the altitude must not exceed 2000 meters, and the equipment should be installed with an inclination angle of no more than 5° from the vertical plane.
Q5 What accessories and technical documentation are supplied with each cabinet?
Each unit is delivered with a Packing List, Product Certificate, User Manual, Factory Test Report, related electrical drawings, as well as cabinet door keys, operating handles, and contract-specified spare parts.