Baer DLX - 3.5.1 Pulse inputs

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3.5.1 Pulse inputs
Pulse inputs and control inputs are subject to signal verification imple-
mented in the software, i.e. pulses that fall short of a minimum period of
time are not processed. This period can be programmed separately for
pulse length and pulse interval length in the range from 10ms to 2000ms in
steps of 10 ms for all pulse inputs.
Incoming pulses are counted, multiplied with a programmable value between
1/1 and 99999999/99999999 (only positive values possible) and added to the
energy registers separated by rate (see Figure 6, Block circuit diagram of im-
pulse processing). Weighting to the correct physical measurement values is
done with pulse multiplication factors (these express the meter and trans-
former constants).
The formulas used are as follows:
Meter with transformer:
K R
W
=
Y
X
: weightingvalueEnergy
×
– X, Y: Numerator and Divisor – no decimal places, 8 digits
– W: Transformer ratio
– R: Meter constant (e.g. Impulses/kWh)
– K: Reading constant (for optimized reading)
The transformer ratio is calculated as the ratio between primary and secon-
dary voltages and currents.
Transformer ratio : W = U
prim
/U
sec
× I
prim
/I
sec
The reading constant usually has a value of 1 (reading in kWh or kvarh).
Example: Voltage transformer: U
prim
/U
sec
= 110kV/100V = 1100
Current transformer: I
prim
/I
sec
= 300A/5A = 60
Meter constant: R = 96000 Imp./kWh
Reading constant: K = 1
→ Transformer ratio: W = 1100 × 60 = 66000
→
16
11
=
96
66
=
96000
66000
=
Y
X
: weightingvalueEnergy
Meter without transformer:
K
Const
=
Y
X
: weightingvalueEnergy
– X, Y: Numerator and Divisor – no decimal places, 8 digits
– Const: Impulse constant (e.g. kWh/Impulse)
– K: Reading constant (for optimized reading)
Example: Impulse constant: Const = 2,5 kWh/Impulse
Reading constant: K = 1
→
10
25
=
101
102,5
=
1
2,5
=
Y
X
: weightingvalueEnergy
×
×