Detailed Explanation of the Low-Voltage Switchgear Cabinet Structure
Release time:
2022-08-09
Source:
The cabinet structure forms the foundation for assembling low-voltage switchgear; therefore, the cabinet manufacturing process is the very cornerstone of that foundation. As low-voltage switchgear, it must not only meet the functional requirements of each individual electrical component but also comply with the specific performance criteria unique to low-voltage switchgear.
The cabinet structure is Low-voltage switchgear The foundation of assembly lies in cabinet manufacturing processes, which are the very cornerstone of the entire process. As low-voltage switchgear, such cabinets must not only meet the functional requirements for the integration of each electrical device but also comply with the specific performance criteria unique to low-voltage switchgear.
The editor is currently sharing knowledge about low-voltage switchgear.
The structure and process characteristics of filing cabinets can be broadly categorized into the cabinet’s structural design and its operational processes (including structural configuration, connection methods, component materials, etc.).
Structurally divide
Drawer-style Low-voltage switchgear The manufacturing process has the following characteristics.
(1) The fixed and movable parts must share a common reference standard.
(2) Relevant components shall be adjusted to their optimal positions, using dedicated standard tooling, including standard cabinets and standard drawers.
(3) Errors in the primary dimensions must not be distributed.
(4) Drawers of the same type and specification exhibit reliable interchangeability.
Classified by connection method
(1) Welded type: This method offers the advantages of convenience, robustness, and reliability. However, it suffers from large dimensional errors, a tendency to deform, difficulty in adjustment, and poor aesthetic appeal; moreover, workpieces generally cannot be pre-plated.
The requirements for welding clamps are as follows:
Good stiffness, unaffected by workpiece deformation.
The external dimensions are slightly larger than the nominal dimensions of the workpiece, which can offset the effects of post-weld shrinkage.
Ensure surfaces are smooth, simple, and easy to operate; minimize the use of rotating components to prevent jamming and damage.
To prevent and repair weld spatter, proper workpiece support must be selected, and a weld-resistant pad should also be used on the support.
(2) Fastener connections: advantages include pre-plating of workpieces, adjustment and modification capabilities, aesthetic finishing, standardized component design, pre-production inventory, and minimal dimensional deviations in the frame geometry. The drawbacks are that they are not as robust as welded joints, require higher component precision, and result in relatively higher manufacturing costs. Fasteners are generally standard components, with the main types including ordinary screws, nuts, and rivets; locknuts that can be pre-tightened and finely adjusted; tension nuts that are pre-tightened; self-tapping screws; and specialized fastening screws (for example, those imported from abroad). Low-voltage switchgear Most often, dedicated fastening screws are used.
(3) Hybrid welding-and-fastening connections: This approach combines the advantages of the two methods described above. Typically, welded joints are used at cabinet connection points, while adjustable or variable components are fastened with mechanical fasteners. For large cabinets, electroplating after welding can be challenging; in such cases, the surface is treated with paint. For outdoor cabinets that require welding of pre-plated components, the welded areas may be further protected by thermal-sprayed metal coatings.
Applications of Low-Voltage Switchgear and Low-Voltage Cabinets
Low-voltage switchgear is responsible for power control, protection, measurement, conversion, and distribution in low-voltage power supply systems. It is widely used in industrial settings, public facilities, residential buildings, and virtually any location where electrical equipment is employed; approximately 80% of China’s electricity is delivered through low-voltage switchgear.
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