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IB02602004E
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Instructional Literature
Effective: May 2008
Page
101
Instructions for the FP-6000 Protective Relay
5.4.2.15 Thermal Alarm (49DA and 49MA) Settings
The FP-6000 relay provides two alarm functions (49DA) for each
RTD channel and two alarm functions for the thermal replica
model. Each alarm function has separate pickup and dropout
thresholds and their associated delays. The RTD pickup and
dropout thresholds are based on direct temperature
measurement in degrees and the thermal model pickup and
dropout thresholds are based on the thermal capacity that is
used in the thermal protection. Note that two thermal replica
model alarm functions share one current threshold. If the current
alarm threshold is set the same as the one for thermal protection
trip, the thermal capacity used for protection is the same for
alarm. If the current alarm threshold is set differently from the
one for protection, the thermal capacity used for alarm will be
different for protection.
The thermal alarm delays are in minutes.
Each thermal alarm output can be programmed to any of the
programmable logic gates. The thermal alarm pickup and
timeout events are logged in the event, trip, and history logs and
they can be viewed under Status menu.
5.4.3 System Alarm Settings
This setting menu contains the settings needed to configure all of
the FP-6000 system alarm functions. Each alarm function can be
disabled. The system alarms are programmed to the alarm
output relay and alarm LED indication. These elements may be
used for alarm, tripping or logic functions. The outputs will need
to be configured if the desired use is not an alarm function.
SYSALM pickup in the Event Log Enable settings must be set to
"Yes” to enable logging of Pickup/Dropout events related to
system alarms.
Watt Power Alarm
Units:
Sets the units for watts measurement (kW or MW).
Threshold:
Sets the watts threshold level in units specified, at or above
which the power pickup event occurs. After pickup, if the watts
fall below the specified threshold, a power dropout event occurs.
Delay (m):
Sets the number of minutes that the watts must remain at or
above threshold, before the specified trip output occurs.
VAR Power Alarm
Units:
Sets the units for VAR measurement (kVAR or MVAR).
Threshold:
Sets the VARS threshold level in units specified, at or above
which the power pickup event occurs. After pickup, if the VARS
fall below the specified threshold, a power dropout event occurs.
Delay (m):
Sets the number of minutes that the VARS must remain at or
above threshold, before the specified trip output occurs.
VA Power Alarm
Units:
Sets the units for VA measurement. (kVA or MVA).
Threshold:
Sets the VA threshold level in units specified, at or above which
the power pickup event occurs. After pickup, if the VA falls below
the specified threshold, a power dropout event occurs.
Delay (m):
Sets the number of minutes that the VA must remain at or above
threshold, before the specified trip output occurs.
Watt Demand Alarm
Units:
Sets the units for watts demand measurement. (kW or MW).
Threshold:
Sets the watts demand threshold level in units specified, at or
above which the power demand pickup occurs. After pickup, if
the watt demand falls below the specified threshold, a power
demand dropout event occurs. The demand interval is set in the
Demand Setting section described later in this section.
Delay (m):
Sets the number of minutes that the watt demand must remain
at or above threshold, before the specified trip output occurs.
VAR Demand Alarm
Units:
Sets the units for VAR demand measurement (kVAR or MVAR).
Threshold:
Sets the VARS demand threshold level in units specified, at or
above which the power demand pickup event occurs. After
pickup, if the VARS demand falls below the specified threshold, a
power demand dropout event occurs. The demand interval is set
in the Demand Setting section described later in this section.
Delay (m):
Sets the number of minutes that the var demand must remain at
or above threshold, before the specified trip output occurs.
VA Demand Alarm
Units:
Sets the units for VA demand measurement. (kVA or MVA).
Threshold:
Sets the VA demand threshold level in units specified, at or
above which the power demand pickup event occurs. After
pickup, if the VA demand falls below the specified threshold, a
power demand dropout event occurs. The demand interval is set
in the Demand Setting section described later in this section.
Delay (m):
Sets the number of minutes that the VA demand must remain at
or above threshold, before the specified trip output occurs.
Current Demand Alarm
Pickup:
Sets the current demand pickup level, at or above which the
current pickup event occurs. After pickup, if the current demand
falls below the specified pickup, a current demand dropout event
occurs. The demand interval is set in the Demand Setting section
described later in this section.
Delay (m):
Sets the number of minutes that the current demand must
remain at or above threshold, before the specified trip output
occurs.
Note:
Check the Demand Logging interval. The delay for alarm starts
after the demand is logged, and the demand remains at or above thresh-
old for the time specified in the setting delay for alarm. For example if the
demand interval is set to 15 minutes and the delay for the demand alarm
is set to 15 minutes, the system alarm pickup event occurs after 30 min-
utes.