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Five small variable frequency transformers with a total power rate of 25 MVA were in use at [[Neuhof Substation]], Bad Sachsa, Germany for coupling power grids of former East and West Germany between 1985 and 1990.
For instance, the Langlois Substation in [[Québec]], [[Canada]] {{Coord|45|17|13.76|N|74|0|56.07|W|}} has installed a 100 MW variable frequency transformer to connect the asynchronous grids in Québec and the north-eastern United States.
AEP Texas installed a 100 MW VFT substation in [[Laredo, Texas|Laredo]], Texas, [[United States]] {{Coord|27|34|13.64|N|99|30|34.98|W|}} in early 2007. It connects the power systems of ERCOT (in the United States) to CFE (in Mexico). See [http://www.ettexas.com/projects/vft.asp The Laredo VFT Project]
GE installed a 3 x 100 MW VFT substation in Linden, New Jersey, [[United States]] {{Coord|40|38|0.03|N|74|12|46.04|W|}} in 2009. It connects the power systems of PJM & NYISO (in the United States). This installation is in parallel with three existing phase shifting transformers to regulate synchronous power flow. (See http://www.geenergyfinancialservices.com/LindenVFT_Inauguration.asp The Linden VFT Project])
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