TotalBlock: When this setting is On the voltage control function, TR1A
TCC for
single control and TR8ATCC for parallel control, is totally blocked for manual as
well as automatic control.
AutoBlock: When this setting is On the voltage control function, TR1ATCC for
single control and TR8ATCC for parallel control, is blocked for automatic control.
Operation
FSDMode: This setting enables/disables the fast step down function. Enabling can
be for automatic and manual control, or for only automatic control alternatively.
tFSD: Time delay to be used for the fast step down tapping.
Voltage
UseCmdUSet: This setting enabled makes it possible to set the target voltage level
via IEC 61850 set point command. This, in turn, makes the setting USet redundant.
USet: Setting value for the target voltage, to be set in percent of UBase.
UDeadband: Setting value for one half of the outer deadband, to be set in percent
of UBase. The deadband is symmetrical around USet, see section
"Automatic
voltage control for a single transformer", figure 124. In that figure UDeadband is
equal to DU. The setting is normally selected to a value near the power
transformer
’s tap changer voltage step (typically 75 - 125% of the tap changer
step).
UDeadbandInner: Setting value for one half of the inner deadband, to be set in
percent of UBase. The inner deadband is symmetrical around USet, see section
"Automatic voltage control for a single transformer",figure 124. In that figure
UDeadbandInner is equal to DU
in
. The setting shall be smaller than UDeadband.
Typically the inner deadband can be set to 25-70% of the UDeadband
value.
Umax: This setting gives the upper limit of permitted busbar voltage (see section
"Automatic voltage control for a single transformer", figure 124). It is set in
percent of UBase. If OVPartBk is set to Auto&ManBlock, then busbar voltages
above Umax will result in a partial blocking such that only lower commands are
permitted.
Umin This setting gives the lower limit of permitted busbar voltage (see section
"Automatic voltage control for a single transformer", figure 124). It is set in
percent of UBase. If UVPartBk is set to Auto Block orAuto&ManBlock, then busbar
voltages below Umin will result in a partial blocking such that only raise
commands are permitted.
Ublock: Voltages below Ublock normally correspond to a disconnected transformer
and therefore it is recommended to block automatic control for this condition
(setting UVBk). Ublock is set in percent of UBase.
1MRK 506 375-UEN A Section 12
Control
Railway application RER670 2.2 IEC 323
Application manual
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