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Not many installed.[URL unfurl="true" said:https://en.wikipedia.org/wiki/Variable-frequency_transformer[/URL]]General Electric installed a 3 × 100 MW VFT substation in Linden, New Jersey, in the United States in 2009. It connects the power systems of PJM & New York Independent System Operator (NYISO). This installation is in parallel with three existing phase-shifting transformers to regulate synchronous power flow.