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Be suitable for rural power grid where seasonal load variation is large. 2.Be suitableevelopment zones, industrial zone, etc. where diurnal loadvariation is significant. Core: effectively upgrade transformer's no-load performance by below methods: 1) The core is made of high-permeable grain-orientated top quality cold-rolled silicon sheet and the material is cut with advanced Germany Geoge GmbH automatic shear line with the cut burs controlled within 0.02mm.