copper processing and process standards

Copper platoons, also known as copper busbars or copper busbars, are long conductors made of copper and have a rectangular or chamfered (rounded) rectangle (now rounded with rounded copper bars to avoid tip discharge). The circuit functions to carry current and connect electrical equipment. Copper platoons are widely used in electrical equipment, especially in power distribution units.

Scope of application: production of high and low voltage switchgear busbars, including copper and aluminum
Process requirements:
1. The busbar material is copper and aluminum;
2. The busbar itself should not have serious pits, pores, peeling, cracks, etc.;
3, the general use of copper platoons, except for special requirements, the use of copper platoons for export;
4, high and low switch cabinet floor row generally use copper row, except for special requirements;
5. In addition to the necessary inclination, the busbar is not allowed to have bending or skewing;
6, the surface of the busbar shall not have obvious hammer marks;
7. The switch of the busbar generally searches for the outside of the national standard. If there is a special opening of the component, the opening of the busbar is opened according to the opening of the component;
8, the unit is MM;
9. The main busbar, branch busbar and component leads of the same arrangement shall be symmetrical and consistent, horizontal and vertical, neat and beautiful;
10. Busbars are generally cold-bent and rarely used for hot bending. If hot-bending copper bars are not to exceed 350 degrees, aluminum rows should not exceed 250 degrees;
11. The burr must be removed at the punching and shearing of the busbar to avoid tip discharge;
12. The starting point of the busbar bending should be greater than 0.25L from the nearest insulator busbar support splint, but not less than 50mm. The starting position of the busbar should not be less than 30mm from the busbar. The rectangular copper bar should be bent at a right angle and there should be no crack at the bend. And significant wrinkles;

13. The minimum bending radius should conform to the above table and the bending of multiple busbars should be consistent;
Remarks: a is the thickness of the busbar b is the width of the busbar L is the distance between the two support points of the busbar
14. When the busbar is bolted and fixed, the edge of the support plate at the joint from the pillar insulator shall not be less than 50mm, and the distance between the end of the upper busbar and the lower busbar shall not be less than 10mm (as shown in the above figure); The diameter of the hole should be larger than the diameter of the bolt by 1mm. The diameter of the hole should be valued, not skewed, and the error of the center distance between the holes should be no more than 0.5mm.
15. Selection of copper bars for circuit breakers: The width of the copper and aluminum rows should be the same as the width of the outlet end of the circuit breaker. The thickness of the busbars can be appropriately reduced on the direct load side to meet the requirements;
16. When the branch busbar is connected to the circuit breaker, the busbar punching is a round hole and the connection is made. The MNS/GCK does not need to be made to branch the zero row when going in and out, but it must be made when going in and out, and the zero row and the ground row in the cabinet. According to the way of entering and leaving the line, it is determined whether it is installed in front of the cabinet or behind the cabinet;
17. For low-voltage metering cabinets, it is convenient to install transformers. The copper bars should be disconnected in the metering room and connected by lap joints. The length of the lap joints should meet the standards for transformer installation and maintenance. Other direct connections are greater than or equal to 4000A. The board busbar clamp is fixed and the insulator is disabled;
18. When the medium and high voltage busbars pass through the metal plate, they shall provide matching casings and take other insulation measures;

19. The busbar should be insulated and fixed to ensure that the distance between the busbars and between the busbars and other components is constant. The fixed distance is two horizontal fixed points of no more than 1000mm, the vertical two fixed points are not more than 800mm, and the copper and aluminum busbars are bent. There shall be no cracks or severe wrinkles, the height of the wrinkles shall not be greater than 1 mm, and the bending radius shall not be less than 2 times that of the rear row. Under the premise of no cracking or severe wrinkling after bending of the copper and aluminum busbars, the bending radius is allowed to be equal to the thickness of the busbar;
18. The contact surface of the copper-aluminum busbar and the electrical components should be smooth and smooth, and the edges and apertures of the connector should be free of burrs and unevenness;

20. Bolt connection and support connection of copper and aluminum busbars, connection of busbars to electrical components and places within 10mm from all joints shall not be painted; when busbars are connected with busbars, busbars and branch busbars and electrical components, they are overlapped The surface should meet the following requirements. 1>When the copper row is connected with the copper row, the surface should be tinned. If the customer has requirements, it should meet the customer's requirements; 2> When the aluminum row and the aluminum row are connected, they can be directly connected (the etched surface should be removed from the oxide layer). 3> When the copper bars are connected to the aluminum bars, the copper bars must be tinned or silver plated. Under special conditions, copper-aluminum transition sheets should be used.

21. When the busbar is lapped, the contact surface should be flat and free of oxide film. The reduced cross-sectional area after processing should meet the following requirements:
 a) the copper row should not exceed 3% of the original section;
 b) The aluminum row should not exceed 5% of the original section.
21. Process requirements for busbar installation
1> The arrangement of the busbars should be hierarchical, neat and tidy, horizontal and vertical.
2> When copper and aluminum busbars are connected to electrical components, the roots of the busbars and electrical component ends shall have an vacant position of not less than 5 mm.
22. Copper and aluminum busbars are connected with electrical components and copper and aluminum busbars are connected with copper and aluminum busbars. The connection surface is tight and reliable, and there are anti-loose devices;

23. The copper and aluminum busbars are connected to the electrical components, and the copper and aluminum busbars are connected by bolts. The diameter of the bolts should be 1mm smaller than the aperture.
24. All bolts, nuts, washers and spring washers for fastening the busbars shall be galvanized.
25. The copper and aluminum busbars are connected to the electrical components, and the lengths of the bolts when the copper and aluminum busbars are connected are selected by the anti-loose device to fix the bolts to expose the nuts 2 to 5 teeth. The nut side should have a spring washer or lock nut and be marked with a lock.
26. When the two electrical components are connected by copper or aluminum busbars, if the distance exceeds 800 mm, it is necessary to add insulation fixing points on the busbar. The insulation fixing points on the busbar shall be fixed flat and shall not be subjected to additional force to the busbars supported by them.