ABB Relion 670 Series Applications Manual page 383

1MRK 511 401-UUS F
In a simple case, when only the switchgear in the transformer bays needs to be considered, there
is a built-in function in TR8ATCC (90) block that can provide information on whether a transformer
is connected to the parallel group or not. This is made by connecting the transformer CB auxiliary
contact status to TR8ATCC (90) function block input DISC, which can be made via a binary input,
or via GOOSE from another IED in the substation. When the transformer CB is open, this activates
that input which in turn will make a corresponding signal DISC=1 in TR8ATCC (90) data set. This
data set is the same data package as the package that contains all TR8ATCC (90) data transmitted
to the other transformers in the parallel group (see section
TR8ATCC functions"
which will lead to T3 sending the DISC=1 signal to the other two parallel TR8ATCC (90) modules (T1
and T2) in the group. Also see table 40.
T1
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Figure 184: Disconnection of one transformer in a parallel group
When the busbar arrangement is more complicated with more buses and bus couplers/bus
sections, it is necessary to engineer a specific station topology logic. This logic can be built in the
application configuration in PCM600 and will keep record on which transformers that are in
parallel (in one or more parallel groups). In each TR8ATCC (90) function block there are eight
binary inputs (T1INCLD,..., T8INCLD) that will be activated from the logic depending on which
transformers that are in parallel with the transformer to whom the TR8ATCC (90) function block
belongs.
TR8ATCC (90) function block is also fitted with eight outputs (T1PG,..., T8PG) for indication of the
actual composition of the parallel group that it itself is part of. If parallel operation mode has been
selected in the IED with setting
function will consider communication messages only from the voltage control functions working
in parallel (according to the current station configuration). When the parallel voltage control
function detects that no other transformers work in parallel it will behave as a single voltage
control function in automatic mode.
Exchange of information between TR8ATCC functions
Each transformer in a parallel group needs an Automatic voltage control for tap changer, parallel
control TR8ATCC (90) function block of its own for the parallel voltage control. Communication
between these TR8ATCCs (90) is made either on the GOOSE interbay communication on the IEC
61850 protocol if TR8ATCC (90) functions reside in different IEDs, or alternatively configured
internally in one IED if multiple instances of TR8ATCC (90) reside in the same IED. Complete
exchange of TR8ATCC (90) data, analog as well as binary, on GOOSE is made cyclically every 300
ms.
TR8ATCC (90) function block has an output ATCCOUT. This output contains two sets of signals.
One is the data set that needs to be transmitted to other TR8ATCC (90) blocks in the same parallel
Bay control REC670
Application manual
for more details). Figure
T2 T3
TrfId = Tx , then the TxPG signal will always be set to 1. The parallel
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"Exchange of information between
184 shows an example where T3 is disconnected
V V
V
1
2
Z
Z I Z
I
2
1 1 2
I =I +I
L 1
Section 14
3
I =0
3 3
2
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Control
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