ABB Relion 670 Series Applications Manual page 385

1MRK 511 401-UUS F
TR8ATCC (90), and they are predefined as T1, T2, T3,..., T8 (transformers 1 to 8). In figure
are three transformers with the parameter
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 =/,..., =/
other transformer individuals that data shall be received. Settings in the three TR8ATCC blocks for
the transformers in figure 184, would then be according to the table 40:
Table 40: Setting of TxRXOP
TrfId=T1 T1RXOP=
Off
TrfId=T2 T1RXOP=
On
TrfId=T3 T1RXOP=
On
Observe that this parameter must be set to
with identity T1 parameter
Blocking
Blocking conditions
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.
For the Automatic voltage control for tap changer function, TR1ATCC (90) for single control and
TR8ATCC (90) for parallel control, three types of blocking are used:
Partial Block: Prevents operation of the tap changer only in one direction (only VRAISE or VLOWER
command is blocked) in manual and automatic control mode.
Auto Block: Prevents automatic voltage regulation, but the tap changer can still be controlled
manually.
Total Block: Prevents any tap changer operation independently of the control mode (automatic as
well as manual).
Setting parameters for blocking that can be set in TR1ATCC (90) or TR8ATCC (90) under general
settings in PST/local HMI are listed in table 41.
Bay control REC670
Application manual
T1RXOP=Off/On,..., T8RXOP=Off/ On . This setting determines from which of the
T2RXOP= T3RXOP=
On On
T2RXOP= T3RXOP=
Off On
T2RXOP= T3RXOP=
On Off
T1RXOP must be set to Disabled , and so on.
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TrfId set to T1, T2 and T3 , respectively.
T4RXOP= T5RXOP=
Off Off
T4RXOP= T5RXOP=
Off Off
T4RXOP= T5RXOP=
Off Off
Disabled for the "own" transformer. (for transformer
T6RXOP= T7RXOP=
Off Off
T6RXOP= T7RXOP=
Off Off
T6RXOP= T7RXOP=
Off Off
Section 14
Control
184 there
T8RXOP=
Off
T8RXOP=
Off
T8RXOP=
Off
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SEMOD159053-277 v6
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