5-28 L30 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUALPRODUCT SETUP CHAPTER 5: SETTINGS5CURRENT 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. As well, the three-phase energy data do not accumulate ifthe total power from all three phases does not exceed the power cut-off.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 and the event record pages are not configurable.5.3.3.1 Home pageThis page sets the display on the home page and the date and time formats for all pages. Options include display ofproduct information, alarms, actual values, and event records.The path is Settings > Product Setup > Graphical Panel > Home Page. The menu does not display when there is nographical front panel.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.
