Manufacturing of high-voltage switchgear busbars
1 measurement size
According to the arrangement of electrical components in the cabinet, when designing the direction of the busbar, the creepage distance between the phase sequence of the busbar and the creepage distance from the cabinet must be considered. run. Then carry out the size measurement according to the design of the busbar, and the measurement must ensure its accuracy. Otherwise, the error will prevent the busbar from being accurately installed, so measurement is a critical step.
Table 1: Minimum safety distance standards
2 Calculate the cutting length
According to the measurement of the size, the length of the blanking is accurately calculated. The general calculation method of the bus bar with a slope uses the Pythagorean theorem. Generally, the skin thickness must be considered when calculating the blanking length.
3 material selection
The selection of the material is based on the width of the bus bar. The main requirements are described in the previous chapter. The selected materials are cut in strict accordance with the calculated size. The bus bar must be straight, and the bus bar must not have obvious defects such as hammer marks, pits, and mechanical damage. The busbar blanking requires cutting with a shearing machine. The busbar should be calibrated before or after the blanking, and the busbar leveling machine should be used to straighten and correct the busbar. The copper row should be cut to consider whether there is a waste row available to reduce costs.
4 punching
(1) The connection holes of busbars are required to be round holes in special cases.
(2) The size of the connection hole of the busbar. The diameter of the connection hole is generally larger than the diameter of the mounting bolt by 0.5 to 1mm.
According to the arrangement of electrical components in the cabinet, when designing the direction of the busbar, the creepage distance between the phase sequence of the busbar and the creepage distance from the cabinet must be considered. run. Then carry out the size measurement according to the design of the busbar, and the measurement must ensure its accuracy. Otherwise, the error will prevent the busbar from being accurately installed, so measurement is a critical step.
Table 1: Minimum safety distance standards
| NO | Scope of application | Rated voltage (KV) | ||||
| 0.4 | 6 | 10 | 24 | 35 | ||
| 1 |
1. Between live part and ground part (mm) 2. Between live parts of different phases (mm) |
20 | 100 | 125 | 200 | 300 |
| 2 | Between movable body such as mechanical chain and live parts (mm) | 50 | 130 | 155 | 230 | 330 |
| 3 | Reticulated to between live parts (mm) | 120 | 200 | 225 | 300 | 400 |
2 Calculate the cutting length
According to the measurement of the size, the length of the blanking is accurately calculated. The general calculation method of the bus bar with a slope uses the Pythagorean theorem. Generally, the skin thickness must be considered when calculating the blanking length.
3 material selection
The selection of the material is based on the width of the bus bar. The main requirements are described in the previous chapter. The selected materials are cut in strict accordance with the calculated size. The bus bar must be straight, and the bus bar must not have obvious defects such as hammer marks, pits, and mechanical damage. The busbar blanking requires cutting with a shearing machine. The busbar should be calibrated before or after the blanking, and the busbar leveling machine should be used to straighten and correct the busbar. The copper row should be cut to consider whether there is a waste row available to reduce costs.
4 punching
(1) The connection holes of busbars are required to be round holes in special cases.
(2) The size of the connection hole of the busbar. The diameter of the connection hole is generally larger than the diameter of the mounting bolt by 0.5 to 1mm.
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