ABB RET670 Commissioning Manual page 207

1MRK 504 154-UUS B
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T1 - T3 are available,
If
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3. Review the settings for
calculate the upper (V2) and lower (V1) 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 (
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 V
6. Inject a load current for Transformer 1 that is equal to rated load current
current for Transformer 2 that is equal to 95% of rated load current
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
8. Confirm the settings for C
Impedance). Using these setting values and the measured quantity of circulating current
from the local HMI (I
Vdi
EQUATION2089-ANSI V1 EN-US
The voltage regulation algorithm then increases (for transformer
transformer
limits V1 and V2 for the purposes of voltage regulation.
Vi VB Vdi
EQUATION2091-ANSI V1 EN-US
9. To cause a tap change, the calculated value for circulating current voltage adjustment must
offset the injected quantity for bus voltage V
created by setting
Commissioning manual
T1RXOP shall be set to Enabled in instance 2 of TR8ATCC (90), and
T2RXOP shall be set to Enabled in instance 1 of TR8ATCC (90).
T1RXOP and T2RXOP shall be set to Enabled in instance 3 of TR8ATCC (90),
T2RXOP and T3RXOP shall be set to Enabled in instance 1 of TR8ATCC (90) and so on.
The parameter corresponding to the own IED must not be set.
thus not be set in IED
VDeadband (based on percentage of nominal bus voltage) and
equal to VSet for each transformer.
B
I2Base , with polarity as discussed in step 6.
i (Compensation Factor) and X i (Transformer Short Circuit
cc_i ), calculate the value for circulating current voltage adjustment V ci .
= × ×
Ci Icc i Xi _
T1 ) the measured voltage by Vdi and compares Vi against the voltage deadband
= +
VDeadband . Expressed by equation
T1 , T2RXOP not in IED T2 and so on.
t1 ) and subsequent ( t2 ) tap change commands from the
so that Vi is outside the voltage deadband
B
119 and equation 120.
Testing functionality by secondary injection
T1RXOP should
I2Base and a load
I2Base . This will have the
(Equation 117)
T2 ) or decreases (for
(Equation 118)
Section 10
201