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GGD AC low voltage distribution cabinet


Product Overview

GGD type AC low-voltage power distribution cabinet is suitable for power distribution systems with AC 50Hz, rated working voltage 380V, and rated working current up to 3150A for power users such as power plants, substations, factories and mines, as power conversion, lighting and power distribution equipment. distribution and control purposes.

Product Features


Product Structure FeaturesSt
GGD type AC low-voltage power distribution cabinet is suitable for power distribution systems with AC 50Hz, rated working voltage 380V, and rated working current up to 3150A for power users such as power plants, substations, factories and mines, as power conversion, lighting and power distribution equipment. distribution and control purposes.
GGD AC low-voltage power distribution cabinet is a new type of low-voltage power distribution cabinet designed in accordance with the principles of stability, economy, rationality and reliability, according to the requirements of the Ministry of Energy's superiors and the majority of power users and design departments. The product has the characteristics of high breaking capacity, good dynamic and thermal stability, flexible electrical scheme, convenient combination, series, strong practicability, novel structure, high protection level, etc. It can be used as a replacement product for low-voltage switchgear. GGD type AC low-voltage power distribution cabinet complies with 1EC439 "Low-voltage complete switchgear and control equipment", GB7251 "Low-voltage complete switchgear" and other standards.

Conditions of Use
1. The ambient air temperature should not be higher than +40°C, not lower than -5°C, and the average temperature within 24 hours should not be higher than +35°C;
2. For indoor installation and use, the altitude of the place of use shall not exceed 2000m;
3. The relative humidity of the surrounding air should not exceed 50% at a high temperature of +40°C, and a relatively high relative humidity should be allowed at a lower temperature (for example, 90% at +20°C). produce the effect of condensation;
5. When the equipment is installed, the inclination to the vertical plane shall not exceed 5°;
6. The equipment should be installed in a place without severe vibration and impact, and in a place that is not enough to corrode electrical components;
7. If the user has special requirements, he can negotiate with the manufacturer.

electrical properties
Main circuit scheme:
The main circuit of the GGD cabinet is designed with 129 schemes and a total of 298 specifications (excluding the schemes and specifications derived from the functional changes of the auxiliary circuit and the changes of the control voltage);
in:
GGD1 type has 49 schemes and 123 specifications;
GGD2 type has 53 schemes and 107 specifications;
GGD3 type 27 schemes and 68 specifications;
The main circuit scheme was selected and edited after soliciting the opinions of the design and use departments, and the scheme required by the power plant was added. The rated current is up to 3150A, suitable for distribution transformers of 2000kVA and below. In addition, GGJ1 and GGJ2 capacitor compensation cabinets are designed to meet the needs of reactive power compensation, with 4 main circuit schemes and 12 specifications in total.
Auxiliary circuit scheme:
The design of the auxiliary circuit is divided into two parts: the power supply scheme and the power plant scheme. There is enough space in the GGD cabinet to install secondary components. The need for electrical protection.
Main bus:
Considering the price ratio and the feasibility of substituting aluminum for copper, a single aluminum busbar can be used when the rated current is 1500A and below, and a double copper busbar can be used when the rated current is greater than 1500A. The manufacturer manufactures the prototype according to this regulation and passes the type test. Of course, the manufacturer can also replace the aluminum busbar with copper busbar of the same carrying capacity according to the user's requirements. The lapping surfaces of the busbars are all treated with pond tin process.
Electrical component selection:
The GGD cabinet mainly adopts more advanced electrical components that have been mass-produced in China. At the same time, according to the principle of economy and rationality, some old products such as DZ10D and DZ20 are retained under the premise of fully considering the feasibility. The product.
HD13BX and HS 13BX type rotary operation knife switches are special components designed for the unique structure of GGD cabinets. It changes the operation mode of the mechanism and retains the advantages of the old products. It is a practical new electrical component.
If the design department chooses new electrical components with better performance and more advanced technology according to the needs of users, because the GGD cabinet has good installation flexibility, it will generally not cause difficulties in manufacturing and installation due to updating electrical components.
In order to further improve the dynamic stability of the main circuit, the ZMJ-type combined busbar clamp and insulating support for the GGD cabinet are used. The busbar clamp is made of high-strength, high flame-retardant PPO alloy material thermoplastically formed, with high insulation strength, good self-extinguishing performance and unique structure. It can be easily combined into a single busbar clamp or double busbar clamp just by adjusting the building block blocks. The insulating support is a simple molded structure with low cost and high strength, which solves the defect of insufficient creepage distance of old products.

switchgear

Keywords: dry-type transformer, transformer

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