Setting Values (Range) Description
TapPosBk
(automatically
reset/manually
reset)
Alarm
Auto Block
Auto&Man Block
This blocking/alarm is activated by either:
1. The tap changer reaching an end position i.e. one
of the extreme positions according to the
setting parameters
LowVoltTap
and
HighVoltTap
. When the tap changer reaches one
of these two positions further commands in the
corresponding direction will be blocked.
Effectively this will then be a partial block if
Auto
Block
or
Auto&Man Block
is set. The outputs
POSERRAL and LOPOSAL or HIPOSAL will be
activated.
2. Tap Position Error which in turn can be caused by
one of the following conditions:
• Tap position is out of range that is, the indicated
position is above or below the end positions.
• The tap changer indicates that it has changed
more than one position on a single raise or lower
command.
• The tap position reading shows a BCD code error
(unaccepted combination) or a parity fault.
• The reading of tap position shows a mA value
that is out of the mA-range. Supervision of the
input signal for MIM is made by setting the MIM
parameters I_Max and I_Min to desired values,
for example, I_Max = 20mA and I_Min = 4mA.
• Very low or negative mA-values.
• Indication of hardware fault on BIM or MIM
module. Supervision of the input hardware
module is provided by connecting the
corresponding error signal to the INERR input
(input module error) or BIERR on TCMYLTC or
TCLYLTC function block.
• Interruption of communication with the tap
changer.
The outputs POSERRAL and AUTOBLK or TOTBLK will
be set.
This error condition can be reset by the input
RESETERR on TCMYLTCfunction block, or alternatively
by changing control mode of TR1ATCC or TR8ATCC
function to Manual and then back to Automatic.
CircCurrBk
(automatically
reset)
Alarm
Auto Block
Auto&Man Block
When the magnitude of the circulating current
exceeds the preset value (setting parameter
CircCurrLimit
) for longer time than the set time delay
(setting parameter
tCircCurr
) it will cause this
blocking condition to be fulfilled provided that the
setting parameter
OperCCBlock
is
On
. The signal
resets automatically when the circulating current
decreases below the preset value. Usually this can be
achieved by manual control of the tap changers.
TR1ATCC or TR8ATCC outputs ICIRC and TOTBLK or
AUTOBLK will be activated depending on the actual
parameter setting.
MFPosDiffBk
(manually reset)
Alarm
Auto Block
In the master-follower mode, if the tap difference
between a follower and the master is greater than the
set value (setting parameter
MFPosDiffLim
) then this
blocking condition is fulfilled and the outputs
OUTOFPOS and AUTOBLK (alternatively an alarm) will
be set.
Setting parameters for blocking that can be set in TR1ATCC or TR8ATCC under setting group
Nx in PST/ local HMI are listed in table
34.
Section 13 1MRK 511 358-UEN A
Control
318
Application manual
To Next Page
Loading...
