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Display Properties - GE L90 Instruction Manual

Line differential relay ur series.
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5 SETTINGS
!
PATH: SETTINGS
PRODUCT SETUP
# DISPLAY
# PROPERTIES
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
Some relay messaging characteristics can be modified to suit different situations using the display properties settings.
FLASH MESSAGE TIME: Flash messages are status, warning, error, or information messages displayed for several
seconds 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 a
default message. The inactivity time is modified via this setting to ensure messages remain on the screen long enough
during programming or reading of actual values.
DEFAULT MESSAGE INTENSITY: To extend phosphor life in the vacuum fluorescent display, the brightness can be
attenuated 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 L90 has a liquid
crystal display (LCD) and control its backlighting. When the
is turned off after the
DEFAULT MESSAGE TIMEOUT
have been pressed and no target messages are active. When a keypress occurs or a target becomes active, the LCD
backlighting is turned on.
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 be displayed even when the value reflects noise rather than the actual signal. The L90 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 by
communications protocols. Note that the cut-off level for the sensitive ground input is 10 times lower that the
setting value. Raw current samples available via oscillography are not subject to cut-off. This setting
CUT-OFF LEVEL
does not affect the 87L metering cutoff, which is constantly at 0.02 pu.
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 displayed
as zero, while others prefer the voltage to be displayed even when the value reflects noise rather than the actual sig-
nal. The L90 applies 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-off operation applies to quantities used for metering, protection, and control, as well as those
used by communications protocols. Raw samples of the voltages available via oscillography are not subject cut-off.
This setting relates to the actual measured voltage at the VT secondary inputs. It can be converted to per-unit values
(pu) by dividing by the
PHASE VT SECONDARY
and a
VOLTAGE CUT-OFF LEVEL
GE Multilin
!"

DISPLAY PROPERTIES

FLASH MESSAGE
TIME:
1.0 s
DEFAULT MESSAGE
TIMEOUT: 300 s
DEFAULT MESSAGE
INTENSITY: 25 %
SCREEN SAVER
FEATURE: Disabled
SCREEN SAVER
WAIT TIME: 30 min
CURRENT CUT-OFF
LEVEL: 0.020 pu
VOLTAGE CUT-OFF
LEVEL: 1.0 V
SCREEN SAVER FEATURE
followed by the
setting value. For example, a
setting of "1.0 V" gives a cut-off value of 1.0 V / 66.4 V = 0.015 pu.
L90 Line Differential Relay
5.2 PRODUCT SETUP
5.2.2 DISPLAY PROPERTIES
Range: 0.5 to 10.0 s in steps of 0.1
Range: 10 to 900 s in steps of 1
Range: 25%, 50%, 75%, 100%
Visible only if a VFD is installed
Range: Disabled, Enabled
Visible only if an LCD is installed
Range: 1 to 65535 min. in steps of 1
Visible only if an LCD is installed
Range: 0.002 to 0.020 pu in steps of 0.001
Range: 0.1 to 1.0 V secondary in steps of 0.1
is "Enabled", the LCD backlighting
, providing that no keys
SCREEN SAVER WAIT TIME
PHASE VT SECONDARY
5
CURRENT
setting of "66.4 V"
5-9

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