How to handle low-voltage bus grounding
Release Time:
Aug 09,2023
Low-voltage busbars are a type of aluminum busbar, while TMY refers to copper busbars. The busbar connecting the transformer and the low-voltage switchgear is called a busbar bridge. The three-phase rigid busbars located above or below in the switchgear are called low-voltage busbars. The connection from the low-voltage busbar to the distribution equipment is called a feeder. Feeders can be rigid or connected by cables. Generally, rigid feeders are more common in switchgear and carry larger currents, while smaller currents can use cable connections.
Low-voltage busbarIt is a type of aluminum busbar, a rigid busbar. TMY is a copper busbar. The one connecting the transformer and the low-voltage switchgear is called a busbar bridge. The three-phase rigid busbar located above or below in the switchgear is called a low-voltage busbar. The one from the low-voltage busbar to the distribution equipment is called a branch busbar. Branch busbars can be rigid or connected by cables. Generally, rigid busbars are more common in switchgears and carry larger currents, while smaller currents can use cable connections.
The grounding of low-voltage busbars can be achieved through the following measures:
1. Ground wire selection
The grounding wire should use the same material as the busbar, and its cross-sectional area should not be less than half of the busbar's cross-sectional area.
2. Multiple reliable grounding points
Ground wires should be connected at multiple locations within the switchgear room to ensure multiple grounding points and enhance grounding reliability.
3. Ring-shaped grounding wire layout
Use a ring-shaped layout for grounding wires, ensuring grounding wires are installed in each busbar compartment to prevent grounding failure.
4. Resistance grounding and metallic grounding
Both resistance grounding and metallic grounding should be implemented in the switchgear room to leverage the advantages of both grounding methods.
5. Check the grounding resistance value
Measure the grounding resistance value annually to ensure it meets standard requirements.
6. Mark grounding terminals
Clearly mark the grounding terminals with visible signs to avoid misoperation.
7. Regularly inspect grounding wires
Check for cracks or detachment in the grounding wires to ensure reliable grounding.
Proper grounding of low-voltage busbars is crucial for ensuring both power system safety and personal safety. Multiple measures should be adopted to achieve reliable grounding at multiple points.
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