Abstract
In this paper, the three-dimensional finite element model of a low voltage and heavy current three-phase busbar bridge system is established. The edge element is used to discretize the finite element equations of the electromagnetic field. The main characteristics of magnetic flux density and electromagnetic force in the system are obtained. Through the comparison between calculation results and measured ones, the reliability of the calculation is validated. The influence of the operating current, different arrangements of three-phase busbars, space between each phase busbar and frequency on electro-magnetic parameters, especially magnetic flux density and electromagnetic force, are also studied. The low voltage and heavy current busbar bridge is a new type of transmission facility, which is widely applied to transmitting current and power in power plants, large and medium-sized enterprises as well as transformer substations. The electric performance and reliability of busbar bridge systems have gained a good market and brought considerable economic benefits. However, the working noise of such facilities is remarkable, especially when the power consumption increases. On-the-spot investigations show that the working noise is mainly composed of electromagnetic noise and ventilating noise, which have three possible generating sources: the vibration of busbars and steel boxes caused by the alternating electromagnetic force; the aeolian vibration caused by air convection when the temperature inside the bridge rises; the vibration of the magnetic components of the busbar bridge system caused by the magnetostrictive effect. In order to understand the underlying mechanism, energy sources and propagation paths of the working noise, an analysis of the electromagnetic field for busbar bridge systems is required, so that the magnetic field distribution and the electromagnetic force on busbars and steel boxes can be obtained. The analysis is the basis of studying the working noise and it also plays an important role in optimizing the structure of busbar bridge systems.
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