Digitizers - GE N60 Instruction Manual

5 SETTINGS

PATH: SETTINGS CONTROL ELEMENTS
 DIGITIZER 1

MESSAGE
MESSAGE
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
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:
N
out
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.
GE Multilin N60 Network Stability and Synchrophasor Measurement System
 

DIGITIZERS

DIGITIZER 1
FUNCTION: Disabled
DIGITIZER 1 SOURCE:
Off
DIGITIZER 1
LIMIT: 1.000 pu

LIMIT
–

x LIMIT ,

=
truncated

x otherwise ,

x

truncated
------------------------
N round
=

out
LIMIT
DIGITIZER 1(5) SOURCE
setting
DIGITIZER 1(5) LIMIT
127
-LIMIT
FULL SCALE
Figure 5–76: DIGITIZER OUTPUT CHARACTERISTIC
b
6 5 4
– ( ) 1 7 × ( 2 b 2 b 2 b
= + +
6 5
DIGITIZER 1(5)
Range: Disabled, Enabled
Range: Off, any FlexAnalog parameter
Range: 0.050 to 90.000 pu in steps of 0.001
, if x < LIMIT
–
if x LIMIT >

×
127

setting
DIGITIZED
VALUE
SOURCE
LIMIT
–127
842741A2.CDR
3 2 1 0
2 b 2 b 2 b 2 b
+ + + +
4 3 2 1 0
5.7 CONTROL ELEMENTS
5.7.12 DIGITIZERS
(EQ 5.13)
(EQ 5.14)
)
(EQ 5.15)
5-161
5