Xiangyang Yuanchuang Industrial Control Co

Overview of low-voltage fixed switchgear
The AC low-voltage distribution cabinet is suitable for AC power distribution systems of power plants, substations, factories and mines and other power users with rated working voltage and rated working current as power, lighting and It is used for power conversion, distribution and control of power distribution equipment.
The AC low-voltage distribution cabinet is a new type of low-voltage distribution cabinet designed in accordance with the requirements of the superiors of the Ministry of Energy, the majority of power users and the design department, and based on 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, seriality, strong practicality, novel structure and high protection level. It can be used as a replacement product for low-voltage complete switchgear.
Type AC low-voltage distribution cabinet complies with standards for low-voltage complete sets of switchgear and control equipment, and low-voltage complete sets of switchgear.
Model meaning
Normal usage conditions
The surrounding air temperature should not be higher than ℃, and not lower than ℃. The average temperature within shall not be higher than 10°C.
For indoor installation and use, the altitude of the place of use shall not exceed.
The relative humidity of the surrounding air should not exceed 10 degrees when the maximum temperature is 10 degrees, and a larger relative temperature is allowed at lower temperatures. (For example, when the temperature is 0.0°C) The effect of condensation that may occasionally occur due to temperature changes should be taken into consideration.
When the equipment is installed, the inclination with the vertical plane shall not exceed.
The equipment should be installed in a place free from severe vibration and impact, and in a place where electrical components are not corroded.
When customers have special requirements, they can negotiate with the manufacturer.
Electrical performance
This electrical parameter
Circuit plan
The main circuit of the cabinet is designed with a plan and a total of specifications (excluding functional changes of the auxiliary circuit and changes in the control voltage). plans and specifications).
Among them, individual plans and specifications
Individual plans and specifications
Individual plans and specifications
The main circuit plan is selected after soliciting opinions from the design and use departments. Added options required for power plants. The rated current is increased to, suitable for distribution transformers up to and below.
In addition, in order to meet the needs of reactive power compensation, the capacitor compensation cabinet is designed with a main circuit scheme and a total of specifications.
Auxiliary circuit plan
The design of the auxiliary circuit is divided into two parts: the power supply plan and the power plant plan. There is enough space in the cabinet to install secondary components. At the same time, a special type current transformer has been developed to Meet the needs of power plants and special users when installing power outage protection.
Busbar
Taking into account the price ratio and the feasibility of replacing copper with aluminum, single aluminum busbars are used when the rated current is at or below. When the rated current is greater than 1, double copper busbars are used. The manufacturer shall manufacture prototypes in accordance with these regulations and pass the type test. Of course, the manufacturer can also replace the aluminum busbar with a copper busbar with the same interception capacity according to the user's requirements.
Selection of electrical components
We mainly use more advanced electrical components that can be mass-produced in China, such as etc. At the same time, we also retain some of the available electrical components based on the principles of economy and reasonableness, with full consideration of feasibility. Old products, do not use Ji Tao Ru products.
The rotary-operated knife switch is a special component designed to meet the needs of the unique structure of the cabinet. It changes the operating mode of the machine and retains the advantages of the old product. It is a new practical electrical component.
When the design department selects new electrical components with better performance and advanced technology based on user needs, because the cabinets have good installation flexibility, there are generally no difficulties in manufacturing and installation of updated electrical components.
To further improve the dynamic stability of the main circuit, a cabinet-specific combined busbar clamp and insulation support are designed. The busbar clamp is thermoformed from high-strength, high-smoldering alloy material, with high insulation strength, good self-extinguishing performance and unique structure. It can be easily combined into a single busbar clamp or double busbar clamps by simply adjusting the building blocks
Bus clamp. The insulation support is a sleeve-type molded structure with low cost and high strength, which solves the problem of insufficient creepage distance of old products.
Product completeness
The manufacturer should provide the following documents and nearby documents when supplying
Box list
Product certificate
Instructions
Factory test report
Close electrical drawings
Door keys, operating handles and spare parts specified in the contract
Structural features
The cabinet body of the AC low-voltage distribution cabinet adopts the form of a general cabinet, and the frame is made of cold-formed steel It is assembled by partial welding and assembly of section steel. The frame parts and special supporting parts are supplied by the designated steel production factory to ensure the accuracy and quality of the cabinet. The parts of the general cabinet are designed according to the modular principle
and have molds. mounting holes, high universal coefficient. It can facilitate the factory to realize pre-production.
The heat dissipation problem during cabinet operation is fully considered during the design. There are different numbers of heat dissipation slots at the upper and lower ends of the cabinet. When the electrical components in the cabinet heat up, the heat rises and is discharged through the upper slots, while cold air is continuously replenished into the cabinet from the lower slots, making the sealed cabinet automatically < br/> A natural ventilation channel is formed from bottom to top to achieve the purpose of heat dissipation.
In accordance with the requirements of modern industrial product modeling design, the golden ratio method is used to design the cabinet shape and the division size of each part, so that the overall appearance is beautiful and new.
The door is connected to the frame with a rotating shaft-type movable hinge, which is easy to install and disassemble. A mountain-shaped rubber strip is embedded in the removed edge of the door. When the door is closed, the strip between the door and the frame has a certain compression stroke, which can prevent direct collision between the door and the cabinet and also improves the door's protection level.
The instrument door with electrical components is connected to the frame with multiple strands of soft copper wire. The installation parts in the cabinet are connected to the frame with knurled screws, and the entire cabinet forms a complete grounding protection circuit.
Polyester orange baking paint is used as the surface paint. Strong adhesion and good texture. The whole cabinet is matt in color, which avoids the dazzling effect and creates a more comfortable visual environment for the personnel on duty.
The top cover of the cabinet can be removed when needed to facilitate on-site busbar assembly and adjustment. The four corners of the cabinet top are equipped with lifting rings for lifting and shipping.
The anti-expansion level of the body is , and users can also choose between them according to the requirements of the use environment.
Installation and Use
After the product arrives at the delivery location, you should first check whether the packaging is complete and intact. If any problems are found, you should promptly notify the relevant departments to find out the reasons. For products that are not immediately installed, the regulations for normal use conditions should be followed. Place in appropriate place.
Product installation should be carried out according to the installation diagram. The basic channel steel and bolts are prepared by the user. When installing the main busbar, the overlapping surface should be repaired flat, cleaned, coated with neutral Vaseline or take other measures, and then bolted with Fasten.
After the product is installed and put into operation, the following inspections and tests are required.
Check whether the paint on the cabinet is peeling off and whether the inside of the cabinet is dry and clean.
Whether the operating mechanism of the electrical components is flexible and there should be no jamming or excessive operating force.
Check whether the main electrical appliances are switched on and off reliably and prepare. Whether the auxiliary contact is reliably ready for switching on and off.
Check whether the instrument indication and transformer changes and polarity are correct.
Whether the busbar connection is good, and whether the insulating supports, installation parts and accessories are installed firmly and reliably.
Whether the auxiliary contact meets the design requirements and whether the action is accurate.
Whether the contacts of the circuit meet the requirements of the schematic diagram.
Whether the protection circuit system meets the requirements.
Use a volt-megohmmeter to measure the insulation resistance value and the value should not be lower than megohms.
Precautions for use
The product is a low-voltage distribution cabinet that is not installed against the wall, operates on one side (front), and has double-sided doors for maintenance. Product maintenance channels and cabinet doors must be entered or opened by qualified professionals for operation, inspection and maintenance.
After the air circuit breaker is closed and opened many times, the main contacts will be partially burned and carbon substances will be produced, which will increase the contact resistance. The air circuit breaker should be maintained and inspected regularly according to its operating instructions.
Ordering Instructions
Users should provide the following information when ordering
Full model of the product (including main circuit plan number and auxiliary circuit and plan number)
Circuit system combination sequence diagram
Electrical schematic diagram of auxiliary circuit
Internal component list
Special requirements that are inconsistent with the normal use conditions of the product
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