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我厂炼钢车间有一台5吨电弧炉,原配变压器额定容量为2250KVA,次级共有四档,电压:220V、190V、104V、127V,额定熔炼电流5900A。现配变压器额定容量为3000KVA,次级共有四挡:220V、180V、104V、127V,额定熔炼电流7900A。1975年前,因5吨电炉刚上马,投产后为了防止电炉变压器烧坏,将2250KVA 的变压器规定熔炼电流不得超过7000A(即超负荷20%的出厂标准)。那时,工
I plant a steel plant has a 5-ton electric arc furnace, transformer rated capacity of the original 2250KVA, a total of four sub-level, voltage: 220V, 190V, 104V, 127V, rated melting current 5900A. Now with the transformer rated capacity of 3000KVA, a total of four sub-total: 220V, 180V, 104V, 127V, rated melting current of 7900A. Before 1975, due to 5 tons of electric furnace just launched, put into operation in order to prevent burning furnace transformers, the 2250KVA transformer melting current regulation shall not exceed 7000A (that is, overload 20% of the factory standards). At that time, workers