CHAPTER 8: APPLICATION OF SETTINGS SETTINGS EXAMPLEC70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL 8-138The VT channels are connected as follows:• The type 8L CT/VT module F5 to F7 three-phase VT channels are connected to the bus side three-phase VTs with a138 / 0.115 kV ratio• The type 8V CT/VT module M1 to M3 and M5 to M7 three-phase VT channels are connected to two tap VTs with a1.25 / 0.25 kV ratio. The nominal voltage is calculated below for normal bank conditions and a nominal system voltageof 138 kV (see impedance calculations the following sub-section).The nominal bus phase VT voltage is:Eq. 8-1The nominal tap VT voltage is:Eq. 8-2Therefore, the tap VT secondary voltage is set as:Eq. 8-3Where the VT ratio N tap(VT) is calculated as:Eq. 8-4The following settings are applied in the EnerVista UR Setup software.
