Sheet Metal Fabrication processing is formed by laser cutting or stamping process, shear and bending, bending, bending, welding, riveting. The Sheet metal fabrication used are cold-rolled plate (SPCC), hot-rolled plate, galvanized plate (SHCC) (SECC, SGCC), copper (CU) brass, copper, beryllium copper, aluminum (5052), stainless steel. Sheet metal fabrication processing steps: according to the parts drawing (3D) expanded into a plan (2D), laser cutting or die stamping shape, CNC punching each bending part, should pay attention to the direction of the burr of the workpiece. Then the students are welded or riveted (some). Surface treatment after processing: electroplating, passivation, sand blasting (powder), anode treatment. Products are generally made for the connection and the outer cover. Applications in robotics, drone, communications, medical devices, industrial automation equipment. Sheet Metal Fabrication Sheet Metal Fabrication,Oem Sheet Metal Fabrication,Sheet Metal Forming,Sheet Metal Bending Buildre Group Co., Ltd. , https://www.bldcncmachining.com
Answer: In the cable line with the rubber sheathed cable at the end of the metal sheath, in order to ensure that the induced voltage in the sheath does not exceed the allowable standard, a conductor laid in parallel along the cable line must be installed, and the two ends of the conductor are grounded. This type of conductor is called a return line. When a single-phase ground fault occurs, the ground short-circuit current can flow back to the center of the system through the return line, and the magnetic flux generated by the ground current through the return line cancels the magnetic flux generated by the ground current of a part of the cable conductor and can be reduced. The induced voltage of the sheath in the event of a short circuit.
2. Can cable engineering be divided into several projects?
answer:
(1) Site transportation: Including the loading, unloading, transportation and return of engineering materials from the warehouse to the construction site.
(2) Local projects: including road excavation, tunnels, and trench construction.
(3) Laying project: including laying, intermediate head making, flipping cover plate, buried pipe, school tide, traction head making and so on.
(4) Both ends of the project: including the production and installation of supports, suspension bridges and their foundations, the production of terminal heads, the installation of oil pressure and signal devices, and the testing of electrical properties.
(5) Plug and stop works: including the production of oil-filled cable plugs and heads, installation of fuel tanks, automatic drainage, and signal devices.
(6) Grounding engineering: Including insulation joints, transposition boxes, protectors, and grounding box installation.
3. What inspections should be performed on the acceptance of cable lines?
Answer: (1) The cable specifications should conform to the regulations, the arrangement should be neat, no damage, complete signs, correctness, and clarity;
(2) The fixed bending radius of the cable, the relevant distance and the wiring of the metal sheath of the single-core power cable shall meet the requirements;
(3) The cable terminal and the middle head are not leaking oil, and the installation is firm. The oil pressure of the oil-filled cable and the setting value of the meter should meet the requirements;
(4) Good grounding;
(5) The cable terminal is in correct color, and the metal components such as brackets are complete;
(6) There should be no debris in the cable trench, in the tunnel and on the bridge, and the cover is complete.
1. Why does a single-core cable jacket ground in one end of the cable must be installed with a return cable laid in parallel along the cable?