The NoOfOperations counter simply counts the total number of operations
(incremental counter).
Both counters are stored in a non-volatile memory as well as, the times and dates of
their last reset. These dates are stored automatically when the command to reset the
counter is issued. It is therefore necessary to check that the IED internal time is correct
before these counters are reset. The counter value can be reset on the local HMI under
Main menu/Reset/Reset counters/TransformerTapControl(YLTC,84)/
TCMYLTC:1 or TCLYLTC:1/Reset Counter and ResetCLCounter
Both counters and their last reset dates are shown on the local HMI as service values
under Main menu/Test/Function status/Control/
TransformerTapControl(YLTC,84)/TCMYLTC:x/TCLYLTC:x/
CLCNT_VALandMain menu/Test/Function status/Control/
TransformerTapControl (YLTC,84)/TCMYLTC:x/TCLYLTC:x/CNT_VAL
15.4.2 Setting guidelines
15.4.2.1 TR1ATCC or TR8ATCC general settings
TrfId: The transformer identity is used to identify transformer individuals in a parallel
group. Thus, transformers that can be part of the same parallel group must have unique
identities. Moreover, all transformers that communicate over the same horizontal
communication (GOOSE) must have unique identities.
Xr2: The reactance of the transformer in primary ohms referred to the LV side.
tAutoMSF: Time delay set in a follower for execution of a raise or lower command
given from a master. This feature can be used when a parallel group is controlled in the
master-follower mode, follow tap, and it is individually set for each follower, which
means that different time delays can be used in the different followers in order to avoid
simultaneous tapping if this is wanted. It shall be observed that it is not applicable in
the follow command mode.
OperationAdapt: This setting enables or disables adapt mode for parallel control with
the circulating current method or the master-follower method.
MFMode: Selection of Follow Command or Follow Tap in the master-follower mode.
CircCurrBk: Selection of action to be taken in case the circulating current exceeds
CircCurrLimit.
CmdErrBk: Selection of action to be taken in case the feedback from the tap changer
has resulted in command error.
OCBk: Selection of action to be taken in case any of the three phase currents on the
HV-side has exceeded Iblock.
MFPosDiffBk: Selection of action to be taken in case the tap difference between a
follower and the master is greater than MFPosDiffLim.
Section 15 1MRK 502 071-UEN -
Control
580 Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual
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