Frequency Values - ABB RES670 Technical Manual

1MRK 511 408-UUS A
22.9.5.1
Phasor measurement unit RES670 2.2 ANSI
Technical manual
The output signal AI1 to AI4 are direct output of the, in SMT, connected input to
GRPx_A, GRPxB, GRPxC and GRPx_N, x=1-12. AIN is always calculated residual
sum from the first three inputs. A3P is grouped, three-phase information containing all
relevant information about four connected inputs. Note that all other functions, with a
few exceptions, use this output in configuration. Note that the SMAI function will
always calculate the residual sum of current/voltage if the input GRPxN is not
connected in SMT. Applications with a few exceptions shall always be connected to
AI3P.

Frequency values

The SMAI function includes a functionality based on the level of positive sequence
voltage, MinValFreqMeas, to validate if the frequency measurement is valid or not. If
the positive sequence voltage is lower than MinValFreqMeas, the function freezes the
frequency output value for 500 ms and after that the frequency output is set to the
nominal value. A signal is available for the SMAI function to prevent operation due to
non-valid frequency values. MinValFreqMeas is set as % of VBase/√3
If SMAI setting ConnectionType is Ph-Ph, at least two of the inputs GRPx_A,
GRPx_B and GRPx_C, where 1≤x≤12, must be connected in order to calculate the
positive sequence voltage. Note that phase to phase inputs shall always be connected as
follows: A-B to GRPxA, B-C to GRPxB, C-A to GRPxC. If SMAI setting
ConnectionType is Ph-N, all three inputs GRPx_A, GRPx_B and GRPx_C must be
connected in order to calculate the positive sequence voltage.
If only one phase-phase voltage is available and SMAI setting ConnectionType is Ph-
Ph, the user is advised to connect two (not three) of the inputs GRPx_A, GRPx_B and
GRPx_C to the same voltage input as shown in figure
positive sequence voltage.
BLOCK
DFTSPFC
VAB
REVROT
PHASEA
^GRP1_A
TRM_40.CH7(U)
PHASEB
^GRP1_B
PHASEC
^GRP1_C
NEUTRAL
^GRP1_N
ANSI10000060 V1 EN-US
Figure 303: Connection example
The above described scenario does not work if SMAI setting
ConnectionType is Ph-N. If only one phase-ground voltage is available,
SMAI1
SPFCOUT
G1AI3P
V3P*
BLOCK
G1AI1
BLKTRIP
G1AI2
G1AI4
G1N
Section 22
Basic IED functions
GUID-B494B93C-B5AA-4FD6-8080-8611C34C2AD8 v5
303 to make SMAI calculate a
SAPTOF
TRIP SAPTOF(1)_TRIP
PICK UP
BLKDMAGN
FREQ
ANSI10000060-1-en.vsdx
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