5-158
N60 Network Stability and Synchrophasor Measurement System
GE Multilin
5.6 CONTROL ELEMENTS
5 SETTINGS
5
•
8BIT COMP 1 ADD/SUB
: This setting specifies if the two arguments,
A
and
B
, should be added or subtracted to form
the effective operating signal. If the FlexLogic™ operand configured under this setting is logic 0 (“Off”), the operating
signal is
A
–
B
. If the FlexLogic™ operand configured under this setting is logic 1 (“On”), the operating signal is
A
+
B
.
The element will switch between adding and subtracting instantly, without any additional delay.
•
8BIT COMP 1 PICKUP
: This setting specifies the pickup threshold for the comparator. This setting applies to the value
scaled via the
8BIT COMP 1 SCALE FACTOR
setting.
•
8BIT COMP 1 HYSTERESIS
: Specifies the width of hysteresis for the comparator. The following logic applies:
If
8BIT COMP 1 DIRECTION
=
“Over”, then Dropout
:=
8BIT COMP 1 PICKUP
–
8BIT COMP 1 HYSTERESIS
If
8BIT COMP1 DIRECTION
=
“Under”, then Dropout
:=
8BIT COMP 1 PICKUP
+
8BIT COMP 1 HYSTERESIS
•
8BIT COMP 1 PICKUP DELAY
: Specifies a pickup time delay for the
8BIT COMP 1 OP
FlexLogic™ operand.
•
8BIT COMP 1 RESET DELAY
: Specifies a reset time delay for the
8BIT COMP 1 OP
FlexLogic™ operand.
•
8BIT COMP 1 SCALE FACTOR
: This setting allows re-scaling the two input arguments and the effective operating
quantity. The same scaling factor applies to all three actual values:
8BIT COMP 1 A
,
8BIT COMP 1 B
and
8BIT COMP 1 OUT
.
The scaling enables easier application, testing and troubleshooting. Also, it facilitates telemetry applications.
•
8BIT COMP 1 BLOCK
: This setting specifies a FlexLogic™ operand for blocking the feature based on user-program-
mable conditions. When the blocking input is asserted, the element resets its timers, de-asserts the
8BIT COMP 1 PKP
and
8BIT COMP1 OP
operands (if asserted), clears self-reset targets, logs a ‘blocked’ event if Events are enabled, and
becomes inactive. When unblocked, the element will start operating instantly. If exposed to pickup conditions for an
extended period of time and unblocked, the element will pickup and start timing out at the moment of unblocking.
Typical applications of the
8BIT COMP 1 BLOCK
setting include conditions when the input signals are not reliable. For
example, remote power may be digitized using the digitizer feature and sent via remote inputs/outputs to be used
locally by the 8-bit comparator. The VT fuse fail at the remote location, or the
REMOTE DEVICE OFFLINE
indication may
be used to block this element.
