Interpretation of the related issues of eddy currents generated by dense bus ducts:

In addition to assuming uniform current based on the assumption of uniform resistivity of the medium, electromagnetic induction also generates eddy currents, namely skin effect and proximity effect, resulting in uneven distribution of current on the cross-section, including phase inconsistency. The degree of skin effect and proximity effect is also related to the shape, size, and frequency of the conductor cross-section. The proximity effect is also related to the distance between adjacent conductors or circuits. Next, let's discuss and analyze the eddy current phenomenon in dense bus ducts!

For most copper aluminum busbars or power lines used in enterprises operating at power frequencies, except for special educational situations, the cross-sectional area of the conductors is not very large, and the distance between conductors is not very small. These two factors generally have little impact on students. This type of conductor is called a linear conductor, and its circuit is called a linear circuit. The external inductance of a linear loop is the main part of its total inductance, and eddy currents only affect the magnetic flux inside the conductor and a small portion of the external magnetic flux near the conductor. So even if we have a certain amount of eddy current, the impact on the inductance value of the enterprise can still be minimal (compared to the impact on the loss of the resistor network). In addition, the accuracy of inductance calculation is not as important as that of resistance value. Therefore, the general method for calculating the inductance of power frequency lines can be based on the assumption that the current is uniformly distributed across the cross-section, making the teaching process relatively simple for students to calculate. However, when the impact of eddy currents on enterprises is particularly significant, special considerations must be made. For example, in cases involving metallurgical furnace enclosed busbars or low-voltage high current leads, the busbar enclosure is made of good conductor aluminum alloy, which has the function of shielding magnetic fields and effectively solves the problem of eddy currents easily generated by busbar enclosure.