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5.7 CONTROL ELEMENTS
PATH: SETTINGS
CONTROL ELEMENTS
DIGITIZER 1
There are five (5) digitizer elements. The digitizer truncates the input signal to user-specified symmetrical limits and digi-
tizes the outcome with an 8-bit resolution. The basic operation of the element is described by the following equations:
where: x is an input signal specified by the
LIMIT is defined by the
round is an operand that rounds up to the nearest integer
5
N
is an integer output of the digitizer (from –127 to 127)
out
The output characteristic of the digitizer element is illustrated below:
The output integer number is represented by eight (8) FlexLogic™ operands encoding the input value per the following
convention:
The output operands can be configured to drive relay outputs, such as remote outputs, direct outputs, contact outputs, or
any combination of these, in order to relay the analog quantity to other UR-series IEDs for further processing.
The digitizer averages the signal prior to digitization for increased accuracy. The extra filtering is in effect only under steady-
state conditions or during slow changes of the input value. When the input signal changes significantly, the filtering is
removed to maintain the response speed of the element.
5-168
DIGITIZERS
DIGITIZER 1
FUNCTION: Disabled
DIGITIZER 1 SOURCE:
MESSAGE
Off
DIGITIZER 1
MESSAGE
LIMIT: 1.000 pu
x
=
truncated
N
round
=
out
DIGITIZER 1(5) SOURCE
setting
DIGITIZER 1(5) LIMIT
-LIMIT
Figure 5–76: DIGITIZER OUTPUT CHARACTERISTIC
b
6
5
–
N
1
7
2
b
2
b
=
+
out
6
5
N60 Network Stability and Synchrophasor Measurement System
DIGITIZER 1(5)
Range: Disabled, Enabled
Range: Off, any FlexAnalog parameter
Range: 0.050 to 90.000 pu in steps of 0.001
LIMIT
if x
LIMIT
–
–
LIMIT
if x LIMIT
x otherwise
x
truncated
------------------------
127
LIMIT
setting
DIGITIZED
VALUE
127
SOURCE
LIMIT
–127
FULL SCALE
842741A2.CDR
4
3
2
1
2
b
2
b
2
b
2
b
+
+
+
+
4
3
2
1
5 SETTINGS
5.7.12 DIGITIZERS
0
2
b
+
0
(EQ 5.18)
(EQ 5.19)
(EQ 5.20)
GE Multilin
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