(1) Power equipment and wiring in civil buildings should be equipped with short circuit fault and abnormal operation relay protection device. Protection of power equipment and short-circuit fault should be the main protection and backup protection, if necessary, additional protection can be added
â‘ main protection: to meet the system stability and equipment safety requirements, the fastest speed can be selectively cut off the protection of equipment and line protection.
â‘¡ backup protection: the main protection or circuit breaker refused to move. Used to cut off the protection of the fault. Backup protection can be divided into two kinds of far backup and backup
a. Far backup: When the main protection or circuit breakers refused to move, by the protection of adjacent power equipment or lines to achieve backup.
b. Proximity Backup: When the main protection is refusing to move, backup protection is realized by another set of protection of the power equipment or the line; when the circuit breaker refuses to be actuated, the backup is realized by the circuit breaker failure protection.
â‘¢ Auxiliary protection: simple protection added to supplement the performance of main protection and backup protection or when main protection and backup protection are out of operation.
From abnormal operation protection: It is the protection of the protection of the abnormal operation status of power equipment or lines.
Sheet Metal Fabrication Service
Definition of Sheet Metal Fabrication
Sheet Metal fabrication is the creation of useful metallic parts and structures by the application of multiple fabrication processes. Sheet metal fabrication is basically a broad term that involves various complex processes like cutting, forming, bending, welding, machining, and assembling. The instructions include below: materials, processes, and tools required for sheet metal fabrication.
Types of Sheet Metal Fabrication Materials
The choice of metal depends on the final use of the fabricated parts.
Common fabrication processes:
• Carbon Steel
• Stainless Steel
• Aluminum
• Bronze
• Copper
• Brass
• Aluminized steel
• Galvanized steel
Sheet metal fabrication: Forming or Deformation
Bending: Sheet metal bending is one of the most popular deformation processes. A machine known as a Press brake is used to bend sheet metals into V, U, or other complex shapes. With an increase in gauge thicknesses of sheet metals the force required to bend increases.
Stamping: In the stamping process, a hydraulic or mechanical stamping press equipped with a tool and die is used to perform specific tasks like curling, drawing, embossing, flanging, etc
Hemming: Hemming is a process by which the edges of sheet metal are folded over itself or another piece of sheet metal to create a rounded edge. In the sheet metal fabrication process, two types of hemming processes are widely involved. They are roll hemming and conventional die hemming. Conventional hemming is used for mass production. A hemming roller is used for roll hemming.
Spinning: Spinning is a metal fabrication process where a lathe machine is used to rotate the sheet metal against a tool to produce conical or cylindrical shapes.
Advantages and Disadvantages of Sheet Metal Fabrication
As sheet metal fabrication covers a wide area of techniques and methods, the advantages and limitations will vary depending on the process used during fabrication.
Benefits:
i. Sheet metal fabrication is fast and can produce high-quality components.
i. A large number of processes are available with wide range of materials
ii. High strength to weight ratio for sheet metal fabricated parts.
Disadvantage:
i. Each fabrication process has their own limitations.
ii. High initial cost for set up of equipment and tools.
iii. Requirement of skilled labors for each process.
Sheet Metal Fabrication Service,Sheet Metal Fabrication Services,Cnc Sheet Metal Fabrication,Industrial Sheet Metal Fabrication
Suzhou FCE precision electronics Co., LTD , https://www.sjfukeyifcesz.com