Abstract
In order to improve energy efficiency by increasing heat dissipation performance of bus-bar which distributes the current in high-power switchboard, the heat dissipation effects of the shape modification and surface treatment of Cu bus-bar were studied. The surface temperatures of the conventional plate-type bus-bar, and the improved tunnel-type bus-bar were compared by using electromagnetic and thermal analyses. The optimum thickness of tunnel-type bus-bar and the spacing and array among three bus-bars were calculated; and the surface temperature of tunnel-type bus-bar showed 7.9 °C lower than that of plate-type bus-bar in a 3-phase array condition. In addition, the surface and internal temperatures of the uncoated, CNT (Carbon nanotube)-coated, and BN (Boron nitride)-coated Cu bus-bars were measured with thermal imaging camera and the experiment using a hot plate. It was confirmed that the difference in the internal temperature between uncoated and BN-coated Cu was 19.4 °C. The application of the bus-bar improved from this study might contribute to the increase in power energy efficiency.
Highlights
The switchboard is a device that distributes power supplied from the power company or the power plant with each circuit breaker by electrically connecting them to the appropriate power source according to the rating of various facilities and equipment used
In order to distribute the power, the switchboard supplies power to various facilities through the main circuit breaker installed in a panel or a frame and a bus-bar connected to a plurality of branch circuit breakers, while simultaneously performing a function of opening and closing the power supply
Bus-bar, which is mainly made of copper and aluminum, is a conductor used in place of the power cable. It is mainly used in high-power switchboards because it has a higher heat dissipation effect than cables and it has a larger surface area to lower the impedance of the high-frequency current flowing on the surface of the conductor
Summary
The switchboard is a device that distributes power supplied from the power company or the power plant with each circuit breaker by electrically connecting them to the appropriate power source according to the rating of various facilities and equipment used. In the case of a plate-shaped bus-bar arranged parallel to the inside of the switchboard, if the current flows in a certain direction, the attraction and the repulsive forces are generated due to the influence of the electromagnetic field formed around the conductor. At this time, because the plate surface area facing each other is relatively large, the bus-bar is not stabilized due to the influence of the electromagnetic field. The development of the improved bus-bar indicating high heat dissipation performance and power efficiency compared to the conventional bus-bar was performed; and the optimal bus-bar model was proposed based on the results of the electromagnetic field analysis according to the shape of the bus-bar and surface treatment technique to improve the heat dissipation characteristics of the bus-bar itself
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