Abstract
The paper presents an analytical method for calculating impedances of rectangular bus ducts. The method is based on the partial inductance theory—in particular, the impedance of rectangular busbars in a three-phase system with a neutral conductor is described. The results of resistances and reactances of these systems of multiple rectangular conductors were obtained. Skin and proximity effects were taken into account. The measurements of the impedance of shielded and unshielded high-current busducts of rectangular conductors were also carried out. The magnetic field of the busbars was determined with several methods.
Highlights
Electrical connections between the main devices and the apparatus of power substations, which conduct a current of considerable value, are usually made of bare aluminum or copper conductors conduct a current of considerable value, are usually made of bare aluminum or copper conductors fixed on post insulators which are called busbars or bars [1,2]
If the physical significance of these reactances described by a 3 × 3 impedance matrix (Table 2) is considered, the differences between these reactances calculated by the integral equation method (IEM) and finite element method (FEM) practically disappear
It is necessary to take into account the fact that in the IEM these reactances are calculated for a finite length busbar, while in the FEM, they are calculated per unit of length
Summary
Electrical connections between the main devices and the apparatus of power substations, which. Division of the k-th rectangular busbar with an i-th phase or neutral circuit is made separately in the horizontal (Ox axis) and vertical (Oy axis) directions In this way, rectangular elementary conductors are obtained along with widths ∆a and heights ∆b respectively, determined by the following formulas:. The admittance matrix, with elements given by (23), will allow the determination of the impedance matrix of the shielded three-phase high-current bus duct with a neutral conductor with rectangular busbars on the basis of the formula h i h i−1. Ii If, for example, only phase current Ii exists, its return to the power source is via the neutral bus (Figure 4) This means that this current forms a closed loop (n − 1)drops.
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