The electrical equipment of most of our country's construction projects has gradually changed from low-voltage fixed screens to low-voltage drawers widely adopted in the selection of low-voltage power distribution screens ten years ago. The equipment level of the equipment is becoming more and more rampant, the manufacturing technology continues to advance, the electrical components are continuously updated, and the quality of equipment continues to increase. At the same time, the price of low-voltage power distribution equipment has also increased significantly. This requires that according to the characteristics of each project and the technological content of the process equipment, choose a low-voltage power distribution equipment according to local conditions, not only meet the requirements of the parameters of the process equipment technology, and reasonably apply advanced equipment, but also consider the developer's capital situation to prevent Unrealistic waste, otherwise it will affect the project cost and delay the construction period.
2 low-voltage cabinet type The design of the current low-voltage drawer cabinet selection and other major types of three types.
2.1 Design Standards Three products have standardized design for functional units. The same functional units can be interchanged. When a functional unit fails, the faulty unit can be immediately removed and replaced with a standby unit to restore power supply in time. The design considers that there is a reliable mechanical interlock between the functional unit and the compartment to ensure that the main loop and the auxiliary loop can be moved under the power-off state. The mechanical interlocking device enables the drawer to have obvious “closing†and “minutesâ€. Locations such as “sluiceâ€, “testâ€, “pull out†and “isolationâ€, and corresponding signs, ensure operational safety, which is unmatched by other forms of low-voltage distribution cabinets.
2.2 Cabinet Processing BFC-20B cabinets are stamped and formed with sheet steel. GCK and MNS cabinets are made of thin-walled profiled steel pipe profiles. They are lightweight, flexible, and easy to assemble. The exterior of the cabinet is electrostatically sprayed with epoxy powder. Both wear-resistant and glossy appearance, other metal components in the cabinet are plated and purified for surface treatment.
2.3 The internal design of the cabinet The MNS type is divided into three compartments. The horizontal bus is arranged at the rear of the cabinet, the electrical component room is at the left front of the cabinet, and the cable room is at the right of the front of the cabinet. These products are safe and fireproof, and the anti-arcing measures are quite complete. They are separated by flame-retardant foam plastic functional walls in the horizontal bus compartments and functional units, and the other compartments are separated by rhodium-plated steel plates, effectively preventing the switching elements. Due to the accident caused by the short circuit between the arcing and the busbar caused by the fault, the MNS type drawer cabinet is obviously superior to other brands in the aspects of protection performance, equipment overload performance and the like.
2.4 Cabinet geometry This type of product is smaller than a fixed low-pressure screen, which facilitates installation in a power distribution room with a small size. For the same specifications of the cabinet, MNS type can accommodate 36 functional units, GCK type can accommodate 20, and BFC 20B type accommodates less.
2.5 The degree of protection listed above all types of drawers, protection grades are not the same, BFC20B is IP20, other products reach IP40, MNS type of protection can reach 1P55. 3 Conclusion In the above three types of low voltage drawer cabinet, BFC-20B manufacturing process is not good , Low degree of protection, there is no measure to prevent the entry of small animals, and MNS type of product, from design to manufacturing process, especially the protection level exceeds other products, is the ideal low-voltage chest of drawers, and GCK performance and other parameters than BFC 20B, less than MNS type. From the perspective of market prices, with the BFC-20B as the base price, each GCK counter is worth several thousand dollars more than the BFC20B. The price of the MNS type is partial, which is about twice that of the BFC-20B. In view of the current investment situation in China, blind pursuit of non-conformity National conditions. In order to make the low-voltage equipment not only meet the needs of users, but also can be upgraded, the GCK drawer cabinet is generally suitable. Although the product is one grade lower than the MNS type, the equipment quality can fully meet the needs of users. It is worth noting that, when ordering, the user should check whether the manufacturer passed the 3C certification and whether the quality of the equipment complies with the National Electrical Products Quality Supervision and Management Regulations. EM
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