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Cost of small capacity transformer single-phase power supply system construction, light load area can reduce construction investment. Big load region of single-phase power supply acmotor2.blogspot.com system renovation, must have a larger economic investment. I see, some pilot single-phase transformer in residential quarters, is a large transformer into multiple small transformer, near load installation, shorten the distance, a low pressure trunk, due to the distance of the source to auto parts the load is certain, shortening the distance between motor parts low voltage power supply, is bound to extend the transmission distance, this transformation requires a lot of investment, such as electric motor 12v 500w the original 3 unit 30 families use 160 kVA three-phase transformer.
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switch to three single-phase 50 kVA transformer power supply, table 2 lists two retrofit scheme of materials and the change of loss, obviously increased the construction investment. First, in order to reduce the low voltage main line loss, to introduce the high voltage line load center, increase the high voltage line construction investment. Secondly, using many sets of small capacity transformer no-load loss and load loss, after all is more than the original list of large transformer. Third, the purchase funds are many sets of small capacity transformer is greater than the single purchase money of big capacity transformer. As residential electricity more abroad, several or each use of a single-phase transformer, because countries rich, large amounts of money into the electric power department. Although the investment is bigger, for their overall economical.
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