CHAPTER 5: SETTINGS PRODUCT SETUPD30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 5-275For Wye connections:Eq. 5-4Eq. 5-5where VT primary = VT secondary × VT ratio and CT primary = CT secondary × CT ratio.For example, given the following settings:CURRENT CUT-OFF LEVEL: “0.02 pu”VOLTAGE CUT-OFF LEVEL: “1.0 V”PHASE CT PRIMARY: “100 A”PHASE VT SECONDARY: “66.4 V”PHASE VT RATIO: “208.00 : 1"PHASE VT CONNECTION: “Delta”We have:CT primary = “100 A”, andVT primary = PHASE VT SECONDARY x PHASE VT RATIO = 66.4 V x 208 = 13811.2 VThe power cut-off is therefore:power cut-off= (CURRENT CUT-OFF LEVEL × VOLTAGE CUT-OFF LEVEL × CT primary × VT primary)/VT secondary= ( × 0.02 pu × 1.0 V × 100 A × 13811.2 V) / 66.4 V= 720.5 wattsAny calculated power value below this cut-off does not display.5.3.3 Graphical front panelUse the EnerVista software to configure the graphical front panel. The settings are not accessible from the graphical frontpanel.The following screens are available:• Home page• Rolling mode• Metering editor• Single-line diagram editor• Annunciator editor• Configurable navigationThe settings menu itself and the event record pages are not configurable.Multiple screens can be opened in the EnerVista software, but the first remains active and the others can be read-only. Forexample, the Annunciator Editor and Single Line Diagram Editor can be open and active, then subsequently opened RollingMode and Home Page screens are read-only. Close the windows, then re-open the one required.Lower the VOLTAGE CUT-OFF LEVEL and CURRENT CUT-OFF LEVEL with care as the relay accepts lower signals as validmeasurements. Unless dictated otherwise by a specific application, the default settings of “0.02 pu” for CURRENTCUT-OFF LEVEL and “1.0 V” for VOLTAGE CUT-OFF LEVEL are recommended.The graphical front panel is a hardware option. See the Order Codes section in chapter 2 for details.
