ABB Relion REG670, Applications Manual

Page: 579 / 780

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
60 .
1MRK 502 071-UEN -
Section 15
Control
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 573
Application manual