1.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 figure, the size of the section is subject to the principle, but the specifications are in accordance with this specification. If the design is obviously unreasonable, the customer should be contacted in writing. The rated current of the incoming switchgear is the minimum of the size of the busbar. It is also considered that the busbar should withstand the breaking current and the dynamic thermal 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 according to the cabinet condition. The main busbar of the company's high voltage switchgear is selected as follows:
Rated current A
Handcart cabinet
Ampacity
630
60×8
1070
800~1250
80×8
1370
1600
100×8
1685
2000
120×10
2170
2500
2X80X10
3150
2X120X10
4000
3X120X10
2.For the selection of the branch busbar of the high-voltage switchgear, the specifications are in accordance with this specification. For the copper intercept flow in the incoming line cabinet, the rated primary current of the current transformer equipped with the incoming switch is selected as the basis, and should not be referred to the main bus or switch. Rated current value, the copper intercept flow in the outlet cabinet should be selected based on the rated primary current of the current transformer equipped with the outlet switch, and the process of the busbar lap joint structure in the high voltage cabinet should be considered, for example, the overlap with the primary component. To meet the full lap joint requirements of the structure. The connection of the arrester, voltage transformer and sensor is designed according to 30*3 without affecting the thermal stability. When the main busbar is multiple, it is necessary to consider the thickness of the branch busbar as uniform as possible. According to the above characteristics, the branch busbars of the company's high voltage switchgear are selected as follows:
Switching cabinet rated current（A）
Branch busbar selection
Handcart cabinet
Ampacity
≤100
50X6
775
630
60×6
912
800~1250
80×8
1370
1600
80×10
1540
2000
120×10
2170
2500
2X80X10 (Shaped)
3150
2X120X10
4000
3X120X10
Contact: Leanne
Phone: 0086-13853146766
Tel: 0086-13853146766
Company: LJMC
Add: 4th floor,Pingan group industrail park,Pingan street office,Jinan city ,Shandong