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Contact SupplierTransformers are tailer-made products and the deisgn varies with the impedence levels (constant Ohmic and constant percentage), transmission voltage and cooling requirments. These are normally provided with on load tap changer for voltage variations. For long distance ruler power distribution lines, speacial autotransformers with automatic tap changing equipments are inserted as voltage regulations, so that customers at the far end of the line receive the same average voltage as those closer to the source. The variable ratio of the autotransformers compensates for the voltage drop along the line.