GE F60 Instruction Manual

Also see for F60: Communications manual Communications guide Instruction manual Instruction manual Instruction manual

Contents

GE F60 Instruction Manual Manual pdf 241 page image

CHAPTER 5: SETTINGS PRODUCT SETUPF60 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 5-275With the graphical front panel, the language can be changed regardless of the language purchased. That is, all languagescan be used. If you select a language with which you are unfamiliar and want to switch back to English for example, themenu order remains the same. That is, Settings is always second, Product Setup is always first, Display Properties is alwayssecond, and Language is always first.The language can be selected also for the front panel in EnerVista under Maintenance > Change Front Panel.The language of the EnerVista software can be changed under View > Language.FLASH MESSAGE TIME — Flash messages are status, warning, error, and information messages displayed in response tocertain key presses during settings programming. These messages override any normal messages. Use this setting tochange the duration of flash messages on the display.DEFAULT MESSAGE TIMEOUT — If the keypad is inactive for a period of time, the relay automatically reverts to a defaultmessage. The inactivity time is modified using this setting to ensure that messages remain on the screen long enoughduring programming or reading of actual values. This setting is not supported on the graphical front panel.DEFAULT MESSAGE INTENSITY — To extend phosphor life in the vacuum fluorescent display, the brightness can beattenuated during default message display. During keypad interrogation, the display always operates at full brightness.This setting is not supported on the graphical front panel.SCREEN SAVER FEATURE and SCREEN SAVER WAIT TIME — These settings are only visible if the F60 has a liquid crystal display(LCD) and control its backlighting. When the SCREEN SAVER FEATURE is “Enabled,” the LCD backlighting turns off after theDEFAULT MESSAGE TIMEOUT followed by the SCREEN SAVER WAIT TIME, provided that no keys have been pressed and notarget messages are active. When a keypress occurs or a target becomes active, the LCD backlighting turns on. Thesesettings are not supported on the graphical front panel.CURRENT CUT-OFF LEVEL — This setting modifies the current cut-off threshold. Very low currents (1 to 2% of the rated value)are very susceptible to noise. Some customers prefer very low currents to display as zero, while others prefer the current todisplay even when the value reflects noise rather than the actual signal. The F60 applies a cut-off value to the magnitudesand angles of the measured currents. If the magnitude is below the cut-off level, it is substituted with zero. This applies tophase and ground current phasors as well as true RMS values and symmetrical components. The cut-off operation appliesto quantities used for metering, protection, and control, as well as those used by communications protocols. Note that thecut-off level for the sensitive ground input is 10 times lower that the CURRENT CUT-OFF LEVEL setting value. Raw currentsamples available via oscillography are not subject to cut-off.VOLTAGE CUT-OFF LEVEL — This setting modifies the voltage cut-off threshold. Very low secondary voltage measurements(at the fractional volt level) can be affected by noise. Some customers prefer these low voltages to be displayed as zero,while others prefer the voltage to be displayed even when the value reflects noise rather than the actual signal. The F60applies a cut-off value to the magnitudes and angles of the measured voltages. If the magnitude is below the cut-off level,it is substituted with zero. This operation applies to phase and auxiliary voltages, and symmetrical components. The cut-offoperation applies to quantities used for metering, protection, and control, as well as those used by communicationsprotocols. Raw samples of the voltages available via oscillography are not subject to cut-off.The CURRENT CUT-OFF LEVEL and the VOLTAGE CUT-OFF LEVEL are used to determine the metered power cut-off levels. Thepower cut-off level is calculated using the following equations. For Delta connections:Eq. 5-3For 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: