What are the structural types of low-voltage switchgear?
Release time:
2022-04-18
Source:
Low-voltage switchboards shall be capable of reliably securing all electrical components in a designated position within the enclosure. Low-voltage switchboards are typically rectangular in shape, such as panel-type or box-type configurations, and may also include frustum-shaped designs like desktop units. Such low-voltage switchboards are generally arranged in a single row.
Low-voltage switchgear From the structural approach:
(1) Fixed low-voltage switchgear
Low-voltage switchboards shall be capable of reliably securing all electrical components in a designated position within the enclosure. Low-voltage switchboards are typically rectangular in shape, such as panel-type or box-type configurations; other forms include table-top and frustum-shaped designs. Such low-voltage switchboards are generally arranged in a single row.
To ensure the shape and dimensions of the low-voltage switchgear cabinet, its various components are typically assembled step by step. Typically, the two side panels—left and right—are formed first, followed by the cabinet body; alternatively, external requirements are met initially, and then the components are sequentially connected. Low-voltage switchgear Internal supports. The lengths of the components that form the cabinet edges must be accurate (with negative tolerances) to ensure proper geometric dimensions in all respects, thereby meeting the overall aesthetic requirements. For the two sides of low-voltage cabinets, due to layout constraints, there should be no bulging in the central area.
In addition, from an installation perspective, the base surface should not exhibit any depressions. In terms of layout and installation, leveling the foundation is a prerequisite; however, there will inevitably be some inherent tolerances in both the levelness of the foundation and the cabinet itself. During layout, efforts should be made to offset transverse variations as much as possible to prevent their cumulative effect, since such accumulation can lead to cabinet deformation, compromise busbar connections, result in improper component mounting, cause stress concentrations, and even shorten the service life of electrical equipment. Therefore, when laying out the installation, the highest point of the foundation should be used as the reference datum, with subsequent adjustments made by gradually raising and expanding outward. When the foundation’s levelness is relatively ideal and predictable, expansion can also proceed from the center toward both sides, thereby ensuring that any accumulated deviations are evenly distributed.
To facilitate adjustment and compensation for accumulated tolerances, the cabinet width tolerance is specified as negative. After the individual components of a low-voltage cabinet have been assembled, reshaping shall be carried out as necessary to ensure that the shape and positional requirements of each part are met. When manufacturing cabinets with complex external profiles or in large batch quantities, full consideration should be given to the use of tooling and fixtures to ensure structural accuracy and uniformity. The datum surface of the fixture should be the bottom surface, and the locating blocks within the fixture should be arranged to facilitate the removal of the workpiece. As for the exterior doors of low-voltage cabinets, which are prone to deformation during transportation and installation, they are typically adjusted uniformly during the installation process.
(2) Low-voltage switchgear Withdrawal type
A drawer-type switchgear consists of a fixed low-voltage cabinet and a movable assembly equipped with primary electrical components such as switches. The movable assembly must be easy to transport for replacement, reliably positioned upon installation, and capable of dependable interchangeability with other drawers of the same model and specification. The manufacturing process for drawer-type low-voltage cabinets is essentially similar to that for fixed cabinets; however, due to the requirement for interchangeability, the dimensional accuracy of the cabinet must be enhanced, and the relevant structural components must provide adequate adjustment capabilities. As for the movable assembly, it must be able to accommodate adjustments and provide reliable support for the primary components, thus requiring high mechanical strength and precision, along with sufficient adjustment range for its associated parts.
The process characteristics of manufacturing drawer-type low-voltage switchgear are as follows:
(1) The fixed and moving parts shall have a unified reference standard;
(2) Relevant components must be adjusted to their optimal positions, and dedicated standard tooling—including standard cabinets and standard drawers—must be used for these adjustments.
(3) The deviation of critical dimensions shall not exceed the tolerance;
(4) Interchangeability among drawers of the same type and specification shall be reliable.
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