6-6
Setting the Relay
Date Code 20020129
SEL-387E Instruction Manual
To display phase-to-phase voltages and adjust the V/Hz calculation, apply the following settings:
VNOM =
230•
»
3 = 398.4
PTR
= 2000•
»
3 = 3464
The values of the final affected measurements, 3V1 and 3V2, cannot be adjusted but remain
increased by
»
3. You do not need to change the VNOM and PTR settings if the display of phase
voltages is acceptable.
Miscellaneous (DATE_F, SCROLD, FP_TO, TGR)
There are four miscellaneous settings to complete the setting process. These are the Date
Format, Front-Panel Time-Out, Scroll Data, and Group Change Delay settings. These settings
are Global settings, accessible with the
SET G
command from a communications port or the
front panel.
The DATE_F setting permits the user to define either a Month-Day-Year (MDY) format or a
Year-Month-Day (YMD) format for all relay date reporting. Default is MDY.
Use the display update rate (SCROLD or scroll data) setting to control how long each pair of
display text messages is displayed on the front panel. Setting range is 1 to 60 seconds with a
default of 2 seconds.
The front-panel time-out setting, FP_TO, defines the length of time before the panel returns to
normal default scrolling displays and LED targeting. This feature is useful for preventing the
panel from being accidentally left in a display state that was being used during testing or to
confirm Relay Word bit status. It is settable from 0 to 30 minutes; default is 16 minutes.
The Group Change Delay timer setting, TGR, defines the amount of time that must pass before a
new group of settings takes effect. It requires the conditions to change to a new group to persist
for time TGR before the relay enacts the new settings. The setting range is 0 through 900
seconds. The factory default value is 3 seconds. This function prevents the relay from jumping
around from group to group in response to spurious fulfillment of the SS1 setting conditions and
ensures that a request for change is real and justified.
DC Battery Monitor (DC1P–DC4P)
The dc battery monitor function is described in
Section 5: Metering and Monitoring
. Four
settable dc voltage thresholds, DC1P through DC4P, assert Relay Word bits DC1 to DC4 when
supply voltage to the relay exceeds the specific threshold. This allows the user to readily
determine if the voltage is within certain limits and to alarm if the voltage goes too high or low.
The four threshold settings are found in the Global setting area.
Breaker Monitor
The Breaker Monitor function is described fully in
Section 5: Metering and Monitoring
. There
is one setting for each of three breakers, BKMON1 through BKMON3. This setting accepts a
SEL
OGIC
control equation using Relay Word elements to describe the triggering conditions for
that particular monitor. When triggered, the monitor measures the three-phase currents 1.5
cycles after triggering, adds them to the total accumulated current for that breaker, and adds one
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