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Clear Relay Records - GE b30 Instruction Manual

Bus differential system.
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PRODUCT SETUP
Some relay messaging characteristics can be modified to suit different situations using the display properties settings.
— This setting selects the language used to display settings, actual values, and targets. This setting displays
LANGUAGE
when a language other than English was purchased, and the range depends on the order code of the relay.
The language can be selected also for the front panel in EnerVista under Maintenance > Change Front Panel.
FLASH MESSAGE TIME
certain key presses during settings programming. These messages override any normal messages. Use this setting to
change the duration of flash messages on the display.
DEFAULT MESSAGE TIMEOUT
message. The inactivity time is modified using this setting to ensure that messages remain on the screen long enough
during programming or reading of actual values.
DEFAULT MESSAGE INTENSITY
attenuated during default message display. During keypad interrogation, the display always operates at full brightness.
SCREEN SAVER FEATURE
(LCD) and control its backlighting. When the
DEFAULT MESSAGE TIMEOUT
target messages are active. When a keypress occurs or a target becomes active, the LCD backlighting turns on.
CURRENT CUT-OFF LEVEL
are very susceptible to noise. Some customers prefer very low currents to display as zero, while others prefer the current to
display even when the value reflects noise rather than the actual signal. The B30 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 substituted with zero. This applies to
phase and ground current phasors as well as true RMS values and symmetrical components. 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
5
samples available via oscillography are not subject to cut-off.
VOLTAGE CUT-OFF LEVEL
(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 B30
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 to cut-off.
Lower the
VOLTAGE CUT-OFF LEVEL
measurements. Unless dictated otherwise by a specific application, the default settings of "0.02 pu" for
CUT-OFF LEVEL

5.3.3 Clear relay records

SETTINGS  PRODUCT SETUP  CLEAR RELAY RECORDS
 CLEAR RELAY
 RECORDS
5-26
— Flash messages are status, warning, error, and information messages displayed in response to
— If the keypad is inactive for a period of time, the relay automatically reverts to a default
— To extend phosphor life in the vacuum fluorescent display, the brightness can be
and
SCREEN SAVER WAIT TIME
SCREEN SAVER FEATURE
followed by the
SCREEN SAVER WAIT TIME
— This setting modifies the current cut-off threshold. Very low currents (1 to 2% of the rated value)
— This setting modifies the voltage cut-off threshold. Very low secondary voltage measurements
and
CURRENT CUT-OFF LEVEL
and "1.0 V" for
VOLTAGE CUT-OFF LEVEL
CLEAR USER REPORTS:
Off
CLEAR EVENT RECORDS:
Off
CLEAR OSCILLOGRAPHY:
Off
CLEAR DATA LOGGER:
Off
CLEAR ARC AMPS 1:
Off
CLEAR ARC AMPS 2:
Off
— These settings are only visible if the B30 has a liquid crystal display
is "Enabled," the LCD backlighting turns off after the
, provided that no keys have been pressed and no
CURRENT CUT-OFF LEVEL
with care as the relay accepts lower signals as valid
are recommended.
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
Range: FlexLogic operand
B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
setting value. Raw current
CURRENT

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