• SetV
• VCTRStatus
•
X2
The transformers controlled in parallel with the circulating current method or the
master-follower method must be assigned unique identities. These identities are
entered as a setting in each TR8A
TCC (90), and they are predefined as T1, T2, T3,...,
T8 (transformers 1 to 8). In figure
291 there are three transformers with the parameter
TrfId
set to T1, T2 and T3, respectively.
For parallel control with the circulating current method or the master-follower method
alternatively, the same type of data set as described above, must be exchanged between
two TR8ATCC (90). To achieve this, each TR8ATCC (90) is transmitting its own data
set on the output ATCCOUT as previously mentioned. To receive data from the other
transformers in the parallel group, the output ATCCOUT from each transformer must
be connected (via GOOSE or internally in the application configuration) to the inputs
HORIZx (x = identifier for the other transformers in the parallel group) on TR8ATCC
(90) function block. Apart from this, there is also a setting in each TR8ATCC =/,..., =/
T1RXOP=Off/On,..., T8RXOP=Off/ On. This setting determines from which of the
other transformer individuals that data shall be received. Settings in the three
TR8ATCC blocks for the transformers in figure
291, would then be according to the
table 58:
Table 58: Setting of TxRXOP
TrfId=T1 T1RXOP=
Off
T2RXOP=
On
T3RXOP=
On
T4RXOP=
Off
T5RXOP=
Off
T6RXOP=
Off
T7RXOP=
Off
T8RXOP=
Off
TrfId=T2 T1RXOP=
On
T2RXOP=
Off
T3RXOP=
On
T4RXOP=
Off
T5RXOP=
Off
T6RXOP=
Off
T7RXOP=
Off
T8RXOP=
Off
TrfId=T3 T1RXOP=
On
T2RXOP=
On
T3RXOP=
Off
T4RXOP=
Off
T5RXOP=
Off
T6RXOP=
Off
T7RXOP=
Off
T8RXOP=
Off
Observe that this parameter must be set to Disabled for the “own” transformer. (for
transformer with identity T1 parameter T1RXOP
must be set to Disabled, and so on.
Blocking
SEMOD159053-275 v2
Blocking conditions
SEMOD159053-277 v6
The purpose of blocking is to prevent the tap changer from operating under conditions
that can damage it, or otherwise when the conditions are such that power system
related limits would be exceeded or when, for example the conditions for automatic
control are not met.
Section 15 1MRK 502 071-UUS A
Control
620 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual
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