ABB Relion REG670, Applications Manual

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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 function block of its own for the parallel voltage
control. Communication between these TR8ATCCs is made either on the GOOSE
interbay communication on the IEC 61850 protocol if TR8ATCC functions reside in
different IEDs, or alternatively configured internally in one IED if multiple instances
of TR8ATCC reside in the same IED. Complete exchange of TR8ATCC data, analog
as well as binary, on GOOSE is made cyclically every 300 ms.
TR8ATCC 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 blocks in
the same parallel group, and the other is the data set that is transferred to the
TCMYLTC or TCLYLTC function block for the same transformer as TR8ATCC
block belongs to.
There are 10 binary signals and 6 analog signals in the data set that is transmitted from
one TR8ATCC block to the other TR8ATCC blocks in the same parallel group:
Table 56: Binary signals
Signal Explanation
TimerOn This signal is activated by the transformer that has started its timer and is going
to tap when the set time has expired.
automaticCTRL Activated when the transformer is set in automatic control
mutualBlock Activated when the automatic control is blocked
disc Activated when the transformer is disconnected from the busbar
receiveStat Signal used for the horizontal communication
TermIsForcedMaster Activated when the transformer is selected Master in the master-follower
parallel control mode
TermIsMaster Activated for the transformer that is master in the master-follower parallel
control mode
termReadyForMSF Activated when the transformer is ready for master-follower parallel control
mode
raiseVoltageOut Order from the master to the followers to tap up
lowerVoltageOut Order from the master to the followers to tap down
Table 57: Analog signals
Signal Explanation
voltageBusbar Measured busbar voltage for this transformer
ownLoadCurrim Measured load current imaginary part for this transformer
ownLoadCurrre Measured load current real part for this transformer
Table continues on next page
1MRK 502 071-UEN -
Section 15
Control
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 569
Application manual