Relationship between busbar layout and current carrying capacity

Relationship between busbar layout and current carrying capacity

The current carrying capacity of the busbar is higher than that when it is placed horizontally. Generally, when the busbar is laid flat and the width is less than 60㎜, the current carrying capacity is 0.95 times that of the vertical bus, and when the width is greater than 60㎜, the current carrying capacity is the vertical 0.92 times, this is because the heat dissipation performance when standing is better than when laying flat.

I2=(1.56～1.58) Id

In the formula, I2 is the current carrying capacity (A) of the double-layer copper bus; Id is the current carrying capacity (A) of the single-layer copper bus. 1.56～1.58 is the coefficient, generally 1.58 for 100×10 bus; 1.57 for 80×10, 1.57 for 60×6, and 1.56 for 60×6.

The relationship between the current carrying capacity of the 3-layer copper busbar and the single-layer copper busbar at 40℃ is:

I3=2Id

<img alt="busbar machine function" border=0" title="busbar machine function" data-original-height="2160" data-original-width="3840" src="https://1.bp.blogspot.com/-OoYNLlNk6_w/Xv2pAuSoDJI/AAAAAAAAAKQ/mxkmaUZxqgUyxPoFYE7ZfbJa1rC2bZQBwCK4BGAsYHg/w781-h413/busbar%2Bmachine%2Bsuppliers.jpg" width="781" />

In the formula, I3 is the current carrying capacity of the four-layer copper busbar (A).

At 40℃, the relationship between the current carrying capacity of the 4-layer copper busbar and the single-layer copper busbar is (this type of option is not recommended, it is best to use a special-shaped busbar instead)