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F3-phase 3-wire Y connection AC voltage controller VT n b 9 For a time instant, there are 2 possible conduction states Each phase has a thyristor conducting. Load voltages are the same as the source voltages There are only 2 thyristors conducting, each from a phase. The load voltages of the two conducting phases are half of the corresponding line to line voltage, while the load voltage of the other phase is 0Power Electron cs i 14 3 -phase 3 phase 3 -wire Y connection wire Y connection AC voltage controller AC voltage controller n n ' a b c u a u b u c i a U a0' VT5 VT3 VT6 VT4 VT2 VT1 For a time instant, there ar For a time instant, there are 2 possible conduction states: e 2 possible conduction states: – Each phase has a Each phase has a thyristor thyristor conducting. Load voltages are the conducting. Load voltages are the same as the source voltages. same as the source voltages. – There are only 2 There are only 2 thyristors thyristors conducting, each from a phase. The conducting, each from a phase. The load voltages of the two conducting phases are half of the load voltages of the two conducting phases are half of the corresponding line to line voltage, while the load voltage of th corresponding line to line voltage, while the load voltage of the other phase is 0. other phase is 0
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