ABB Relion 670 Series Applications Manual page 363

1MRK 511 358-UUS A
Setting
TapPosBk
(automatically
reset/manually
reset)
CircCurrBk
(automatically
reset)
Table continues on next page
Application manual
Values (Range) Description
Alarm This blocking/alarm is activated by either:
Auto Block
1.
Auto&Man Block
2.
•
•
•
•
•
•
•
The outputs POSERRAL and AUTOBLK or TOTBLK will
be set.
This error condition can be reset by the input
RESETERR on TCMYLTC (84) function block, or
alternatively by changing control mode of TR1ATCC
(90) or TR8ATCC (90) function to Manual and then
back to Automatic.
Alarm When the magnitude of the circulating current
Auto Block exceeds the preset value (setting parameter
Auto&Man Block CircCurrLimit ) for longer time than the set time delay
(setting parameter
blocking condition to be fulfilled provided that the
setting parameter
resets automatically when the circulating current
decreases below the preset value. Usually this can be
achieved by manual control of the tap changers.
TR1ATCC (90) or TR8ATCC (90) outputs ICIRC and
TOTBLK or AUTOBLK will be activated depending on
the actual parameter setting.
The tap changer reaching an end position i.e. one
of the extreme positions according to the
LowVoltTap and
setting parameters
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
Block or Auto&Man Block is set. The outputs
POSERRAL and LOPOSAL or HIPOSAL will be
activated.
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 (84) function block.
Interruption of communication with the tap
changer.
tCircCurr ) it will cause this
OperCCBlock is Enabled . The signal
Section 13
Control
Auto
357