input connected. The signal received by SMAI is processed internally and in total 244
different electrical parameters are obtained for example RMS value, peak-to-peak,
frequency and so on. The activation of
BLOCK
input resets all outputs to 0.
SMAI_20 does all the calculation based on nominal 20 samples per line frequency
period, this gives a sample frequency of 1 kHz at 50 Hz nominal line frequency and 1.2
kHz at 60 Hz nominal line frequency.
The output signals
AI1
...
AI4
in SMAI_20_x function block are direct outputs of the
connected input signals
GRPxL1
,
GRPxL2
,
GRPxL3
and
GRPxN
.
GRPxN
is always
the neutral current. If
GRPxN
is not connected, the output
AI4
is zero. The
AIN
output
is the calculated residual quantity, obtained as a sum of inputs
GRPxL1
,
GRPxL2
and
GRPxL3
but is equal to output
AI4
if
GRPxN
is connected. The outputs signal
AI1
,
AI2
,
AI3
and
AIN
are normally connected to the analog disturbance recorder.
The SMAI function block always calculates the residual quantities in
case only the three phases (Ph-N) are connected (
GRPxN
input not
used).
The output signal
AI3P
in the SMAI function block is a group output signal
containing all processed electrical information from inputs
GRPxL1
,
GRPxL2
,
GRPxL3
and
GRPxN
. Applications with a few exceptions shall always be connected
to
AI3P
.
The input signal
REVROT
is used to reverse the phase order.
A few points need to be ensured for SMAI to process the analog signal correctly.
•
It is not mandatory to connect all the inputs of SMAI function. However, it is very
important that same set of three phase analog signals should be connected to one
SMAI function.
•
The sequence of input connected to SMAI function inputs
GRPxL1
,
GRPxL2
,
GRPxL3
and
GRPxN
should normally represent phase L1, phase L2, phase L3
and neutral currents respectively.
•
It is possible to connect analog signals available as
Ph-N
or
Ph-Ph
to SMAI.
ConnectionType
should be set according to the input connected.
•
If the
GRPxN
input is not connected and all three phase-to-earth inputs are
connected, SMAI calculates the neutral input on its own and it is available at the
AI3P
and
AIN
outputs. It is necessary that the
ConnectionType
should be set to
Ph-N
.
•
If any two phase-to-earth inputs and neutral currents are connected, SMAI
calculates the remaining third phase-to-neutral input on its own and it is available
at the
AI3P
output. It is necessary that the
ConnectionType
should be set to
Ph-
N
.
•
If any two phase-to-phase inputs are connected, SMAI calculates the remaining
third phase-to-phase input on its own. It is necessary that the
ConnectionType
should be set to
Ph-Ph
.
1MRK 505 288-UEN A
Section 15
Basic IED functions
483
Technical manual
Содержание Relion 650 Series REB650
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