GE F60 Instruction Manual
Also see for F60: Communications manualCommunications guideInstruction manualInstruction manualInstruction manual
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              | |
Contents
|
5-24 F60 Feeder Protection System GE Multilin5.2 PRODUCT SETUP 5 SETTINGS5• LANGUAGE: This setting selects the language used to display settings, actual values, and targets. The range isdependent on the order code of the relay.• FLASH MESSAGE TIME: Flash messages are status, warning, error, or information messages displayed for severalseconds in response to certain key presses during setting programming. These messages override any normal mes-sages. The duration of a flash message on the display can be changed to accommodate different reading rates.• DEFAULT MESSAGE TIMEOUT: If the keypad is inactive for a period of time, the relay automatically reverts to adefault message. The inactivity time is modified via this setting to ensure messages remain on the screen long enoughduring programming or reading of actual values.• 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.• SCREEN SAVER FEATURE and SCREEN SAVER WAIT TIME: These settings are only visible if the F60 has a liquidcrystal display (LCD) and control its backlighting. When the SCREEN SAVER FEATURE is “Enabled”, the LCD backlightingis turned off after the DEFAULT MESSAGE TIMEOUT followed by the SCREEN SAVER WAIT TIME, providing that no keyshave been pressed and no target messages are active. When a keypress occurs or a target becomes active, the LCDbacklighting is turned on.• CURRENT CUT-OFF LEVEL: This setting modifies the current cut-off threshold. Very low currents (1 to 2% of therated value) are very susceptible to noise. Some customers prefer very low currents to display as zero, while othersprefer the current be displayed even when the value reflects noise rather than the actual signal. The F60 applies a cut-off value to the magnitudes and angles of the measured currents. If the magnitude is below the cut-off level, it is substi-tuted with zero. This applies to phase and ground current phasors as well as true RMS values and symmetrical compo-nents. The cut-off operation applies to quantities used for metering, protection, and control, as well as those used bycommunications protocols. Note that the cut-off level for the sensitive ground input is 10 times lower that the CURRENTCUT-OFF LEVEL setting value. Raw current samples 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 measure-ments (at the fractional volt level) can be affected by noise. Some customers prefer these low voltages to be displayedas zero, while others prefer the voltage to be displayed even when the value reflects noise rather than the actual sig-nal. The F60 applies a cut-off value to the magnitudes and angles of the measured voltages. If the magnitude is belowthe cut-off level, it is substituted with zero. This operation applies to phase and auxiliary voltages, and symmetricalcomponents. The cut-off operation applies to quantities used for metering, protection, and control, as well as thoseused by communications protocols. Raw samples of the voltages available via oscillography are not subject 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 as shown below. For Delta connections:(EQ 5.3)For Wye connections:(EQ 5.4)(EQ 5.5)where 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 V3-phase power cut-off 3 CURRENT CUT-OFF LEVEL VOLTAGE CUT-OFF LEVEL VT primary CT primaryVT secondary------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------=3-phase power cut-off 3 CURRENT CUT-OFF LEVEL VOLTAGE CUT-OFF LEVEL VT primary CT primaryVT secondary--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------=per-phase power cut-off CURRENT CUT-OFF LEVEL VOLTAGE CUT-OFF LEVEL VT primary CT primaryVT secondary----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------= |
Related manuals for GE F60
This manual is suitable for:
manualsdatabase
Your AI-powered manual search engine