TR-2100 User Manual
84
Analogue Inputs
Analogue Inputs are implemented as Object 30 Var 4 (16-bit analogue input without flag)
points. A total of 160 points are implemented, which represent:
•
Analogue Voltage values, 1 per analogue channel
•
Analogue Profile values, 4 per analogue channel (Pre-fault, Immediate, Final, Post-
Clearance)
The Analogue Voltage and the Analogue Profile points use different formulae to calculate
actual engineering units.
Analogue Voltage Point Indices
The 32 Analogue Voltage inputs (Point Indices 1 through 32) are scaled so that 32,768 bits
represent the recorder’s full-scale input value. To convert the DNP output to actual
engineering units, use the following formula.
Actual Primary Units
32768
)
2
(
FSDx
x
value
raw
DNP
=
Where:
-
DNP raw value
is the number output from the DNP port
- FSD
is the full scale primary RMS value (voltage or current)
Example:
The raw value read from Analogue Channel 1 is 19640, and your FSD is 345 kV. Multiply
345000 by square root 2 to obtain the peak voltage, then divide by 32768 bits to obtain Units
Per Bit. Multiply the Units Per Bit by 19640 to obtain the actual primary voltage reading.
volts
x
x
47
.
292432
19640
32768
2
345000
=
Analogue Profile Point Indices
The Analogue Profile points (Point Indices 110 through 429) are scaled so that 16,384 bits
represent the full-scale value. To convert the DNP output to actual engineering units, use
the following formula.
Actual Primary Units
16384
FSD
x
value
raw
DNP
=
Summary of Contents for TR-2100
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