Abstract
Recently, as the number of usage of various electronic devices increases rapidly, the demand for the power is also growing very much Therefore, to supply electricity of high quality steadily and minimize the power loss, the voltage of power transmission and distribution is getting higher and higher to the maximum, and the demand for heavy electric machines such as high power transformer, instrument transformer, and breaker, is also increasing[I]. The heavy electric machines includes all of machines and tools to transfer the electricity generated from the power plants to houses or factories. It must be insulated well in the high voltage, and do its functions properly even in the extreme working conditions. Therefore, in this dissertation, the EMC filter in the high power breaker, one of the heavy electric machine, was suggested as a countermeasure for conductive noises. And the suggested EMC filter in the high power breaker was attenuated 25 - 70 dB in the range of 10 MHz 1.5 GHz When the EFT of 4 kV in the level 4 of IEC 61000-4-4 was induced, it was soon suppressed to 600 V, and the filter was also verified its excellence by satisfying the level 4 of IEC 61000-4-4. Hence, the best feature of it was to prevent the leakage of electromagnetic noise by enhancing immunity of houses or factory machines. Go forward the suggested EMC filter can be applicable not even for electronic • information devices, but also electronic • control devices as the very innovative countermeasu- re, namely, the range of its application can be expected very broad.
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