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Selection of main bus and branch bus

 

1. Selection of main bus:

For the selection of the main busbar of the high-voltage switchgear, the specification should not be less than 50*5. As shown in the drawing, in principle, the cross-sectional size is based on the drawing, but the specifications are in accordance with this specification cnc busbar machine manufacturers. If the design drawing is obviously unreasonable, you should contact the customer in writing. The rated current of the incoming switchgear is the minimum limit for selecting the size of the busbar, and it should also be considered that the busbar should withstand the breaking current and dynamic thermal stability current of the main circuit. The specifications of the contact bus are the same as the main bus, according to the above characteristics. The 35kV main busbar is appropriately enlarged by one stage according to the cabinet.

2. Selection of support bus

For the selection of the branch busbar of the high-voltage switchgear, the specifications are in accordance with this specification. For the copper bar cutoff in the inlet cabinet, the rated primary current of the current transformer equipped with the inlet switch is used as the basis for selection, and the main busbar or the switch should not be referred to Rated current value, the copper block cut-off flow in the outlet cabinet should be based on the rated primary current of the current transformer equipped with the outlet switch, and the manufacturability of the busbar overlap structure in the high-voltage cabinet, such as the primary component

To meet the requirements of full overlap of the structure. The connection row of lightning arrester, voltage transformer and sensor is designed according to 30*3 without affecting the dynamic thermal stability. When there are multiple main buses, the thickness of the branch bus should be considered as uniform as possible.