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The parameter corresponding to the own IED
must not
be set.
T1RXOP
should thus
not
be set in IED
T1
,
T2RXOPnot
in IED
T2
and so on.
3.
Review the settings for
UDeadband
(based on percentage of nominal bus
voltage) and calculate the upper (U2) and lower (U1) voltage regulation limits
for which a tap change command will be issued from the master transformer in
the group.
4.
Review the expected time for first (
t1
) and subsequent (
t2
) tap change
commands from the master transformer in the local HMI under
Main menu/
Settings/Setting group N/TransformerVoltageControl(ATCC,90)/
TR1ATCC:x/TR8ATCC:x/Time/t1 and t2
5.
Inject a voltage U
B
equal to
USet
for each transformer.
6.
Inject a load current for Transformer 1 that is equal to rated load current
I2Base
and a load current for Transformer 2 that is equal to 95% of rated load current
I2Base
. This will have the effect of producing a calculated circulating current
that flows from HV to LV side for Transformer 1 and LV to HV side for
Transformer 2.
7.
Confirm that a circulating current is measured on the local HMI that is equal in
magnitude to 5% of
I2Base
, with polarity as discussed in step
8.
Confirm the settings for C
i
(Compensation Factor) and X
i
(Transformer Short
Circuit Impedance). Using these setting values and the measured quantity of
circulating current from the local HMI (I
cc_i
), calculate the value for circulating
current voltage adjustment U
ci
.
_
Udi Ci Icc i Xi
=
×
×
EQUATION2088 V1 EN
(Equation 119)
The voltage regulation algorithm then increases (for transformer
T2
) or
decreases (for transformer
T1
) the measured voltage by Udi and compares Ui
against the voltage deadband limits U1 and U2 for the purposes of voltage
regulation.
EQUATION2090 V3 EN
(Equation 120)
9.
To cause a tap change, the calculated value for circulating current voltage
adjustment must offset the injected quantity for bus voltage U
B
so that Ui is
outside the voltage deadband created by setting
UDeadband
. Expressed by
Section 12
1MRK502053-UEN B
Testing functionality by secondary injection
220
Generator protection REG670 2.0 IEC
Commissioning manual
Содержание REG670 2.0 IEC
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