ABB Relion 670 Series Applications Manual page 593

1MRK 511 401-UEN Rev. K
UL1L2
TRM_40.CH7(U)
IEC10000060 V3 EN-US
Figure 280: Connection example
24.11.3 SMAI incorrect calculated phase-earth
In some configurations SMAI may produce incorrectly calculated phase-earth values, when this
is the case, a hint will be available in LHMI with text as below.
Calculated phase-earth values are used from one or more SMAIs configured for phase-phase
inputs, without connection to N input.
However, this configuration, combined with unbalanced three-phase input, results in incorrect
calculated phase-earth values.
This in turn may result in maloperation of functions connected to SMAIs configured in this
way, if the function uses phase-earth based values.
Further, if SUM3PH is connected to such a SMAI, then its output values will be incorrect, and
the connected functions may maloperate.
To rectify this situation, revise the configuration from this perspective.
24.11.4 Setting guidelines
The parameters for the signal matrix for analog inputs (SMAI) functions are set via the local
HMI or PCM600.
Every SMAI function block can receive four analog signals (three phases and one neutral value),
either voltage or current. SMAI outputs give information about every aspect of the 3ph analog
signals acquired (phase angle, RMS value, frequency and frequency derivates, and so on – 244
values in total). Besides the block "group name", the analog inputs type (voltage or current)
and the analog input names can be set directly in ACT.
Bay control REC670
Application manual
SMAI1
SPFCOUT
BLOCK
DFTSPFC G1AI3P
REVROT G1AI1
PHASEL1 G1AI2
^GRP1L1
G1AI4
PHASEL2
G1N
^GRP1L2
PHASEL3
^GRP1L3
NEUTRAL
^GRP1N
The above described scenario does not work if SMAI setting
Ph-N . If only one phase-earth voltage is available, the same type of connection
can be used but the SMAI
has to be accounted for when setting
ConnectionType is Ph-N and the same voltage is connected to all three SMAI
inputs, the positive sequence voltage will be zero and the frequency functions
will not work properly.
The outputs from the above configured SMAI block shall only be used for
Overfrequency protection (SAPTOF), Underfrequency protection (SAPTUF) and
Rate-of-change frequency protection (SAPFRC) due to that all other
information except frequency and positive sequence voltage might be wrongly
calculated.
© Copyright 2017 Hitachi Power Grids. All rights reserved
SAPTOF
U3P* TRIP
START
BLOCK
BLKTRIP BLKDMAGN
FREQ
ConnectionType setting must still be Ph-Ph and this
MinValFreqMeas . If SMAI setting
Section 24
Basic IED functions
SAPTOF(1)_TRIP
EC10000060-3-en.vsdx
ConnectionType is
GUID-7AE6FC17-74AA-403B-8559-3B9D6DA1E433 v1
GUID-C8D6C88B-87C6-44C1-804B-CF1594365EE6 v9
587