Digitizers - GE N60 Instruction Manual

CHAPTER 5: SETTINGS
SETTINGS
FREQ RATE 1 FUNCTION:
Enabled = 1
FREQ RATE 1 BLOCK:
Off
SETTING
FREQ RATE 1 SOURCE:
Pos seq voltage (V_1)
Pos seq current (I_1)
Frequency (F)

5.8.12 Digitizers

SETTINGS  CONTROL ELEMENTS  DIGITIZERS  DIGITIZER 1(5)
 DIGITIZER 1

There are five digitizer elements. The digitizer truncates the input signal to user-specified symmetrical limits and digitizes
the outcome with an eight-bit resolution. The following equations describe the basic operation of the element.
where
x is an input signal specified by the
LIMIT is defined by the
DIGITIZER 1(5) LIMIT
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 figure illustrates the output characteristic of the digitizer element.
N60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL
Figure 5-108: Frequency rate of change logic
SETTING
FREQ RATE 1 OV SUPV
PICKUP:
RUN
| V_1 | > PICKUP
SETTING
FREQ RATE 1 OC SUPV
FREQ RATE 1 TREND:
PICKUP:
FREQ RATE 1 PICKUP:
RUN
RUN
| I_1 | >PICKUP
df/dt > PICKUP
SETTINGS
FREQ RATE 1 MIN
FREQUENCY:
FREQ RATE 1 MAX
FREQUENCY:
RUN
F > MIN & F < MAX
RUN
Calculate df/dt
DIGITIZER 1

FUNCTION: Disabled
DIGITIZER 1 SOURCE:

Off
DIGITIZER 1

LIMIT: 1.000 pu

LIMIT if x ,
–

x =
LIMIT if x LIMIT ,

truncated

x otherwise ,

x

truncated
--------------------- -
N = round

out
LIMIT
setting
DIGITIZER 1(5) SOURCE
setting
SETTINGS
FREQ RATE 1 PICKUP
SETTINGS
DELAY:
FREQ RATE 1 RESET
DELAY:
t
PKP
t
RST
Range: Disabled, Enabled
Range: Off, any FlexAnalog parameter
Range: 0.050 to 90.000 pu in steps of 0.001
< LIMIT
–
>


127

CONTROL ELEMENTS
FLEXLOGIC OPERANDS
FREQ RATE 1 OP
FREQ RATE 1 DPO
FREQ RATE 1 PKP
832023A2.CDR
5
Eq. 5-18
Eq. 5-19
5-215