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Back-to-back connection
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== Power transmission == A back-to-back connection for [[electric power transmission]] is a [[High-voltage direct current|high-voltage direct-current]] (HVDC) system with both ends in the same [[Electrical substation|switchyard]]. This is used to couple asynchronously operated [[power grid]]s or for connecting power grids of different [[frequency|frequencies]] where no DC transmission line is necessary.
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