Pulse Inputs - Baer DLX User Manual

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:
– X, Y: Numerator and Divisor – no decimal places, 8 digits
– W:
– R:
– K:
The transformer ratio is calculated as the ratio between primary and secon-
dary voltages and currents.
Transformer ratio : W = U
The reading constant usually has a value of 1 (reading in kWh or kvarh).
Example: Voltage transformer:
Current transformer:
Meter constant:
Reading constant:
→ Transformer ratio:
→
Meter without transformer:
– X, Y:
– Const: Impulse constant (e.g. kWh/Impulse)
– K:
Example: Impulse constant:
Reading constant:
→
20
Energy value
Transformer ratio
Meter constant (e.g. Impulses/kWh)
Reading constant (for optimized reading)
Energy value weighting
Energy value
Numerator and Divisor – no decimal places, 8 digits
Reading constant (for optimized reading)
Energy value weighting
X
weighting :
Y
× I
/U /I
prim sec prim sec
U /U = 110kV/100V =
prim sec
I /I = 300A/5A
prim sec
R = 96000 Imp./kWh
K = 1
1100 × 60
W =
X 66000
: = =
Y 96000
X
weighting :
Y
Const = 2,5 kWh/Impulse
K = 1
X 2,5 2,5
: = =
Y 1 1
W
=
×
R K
1100
= 60
= 66000
66 11
=
96 16
Const
=
K
×
10 25
=
×
10 10