ABB Relion 670 Series Commissioning Manual page 231

1MRK 504 165-UEN E
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3. Review the settings for
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 (
the master transformer in the local HMI under Main menu/Settings/IED Settings/
TransformerVoltageControl(ATCC,90)/TR1ATCC:x/TR8ATCC:x/Time/t1 and t2
5. Inject a voltage U
6. Inject a load current for Transformer 1 that is equal to rated load current
load current for Transformer 2 that is equal to 95% of rated load current
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
8. Confirm the settings for C
Impedance). Using these setting values and the measured quantity of circulating current
from the local HMI (I
ci .
U
Udi
EQUATION2088 V1 EN-US
The voltage regulation algorithm then increases (for transformer
transformer
deadband limits U1 and U2 for the purposes of voltage regulation.
EQUATION2090 V3 EN-US
9. To cause a tap change, the calculated value for circulating current voltage adjustment
must offset the injected quantity for bus voltage U
deadband created by setting
EQUATION2092 V2 EN-US
EQUATION2094 V2 EN-US
Therfore:
Ci Icc i Xi U
EQUATION2096 V1 EN-US
Transformer protection RET670
Commissioning manual
T1RXOP and T2RXOP shall be set to On in instance 3 of TR8ATCC,
T2RXOP and T3RXOP shall be set to On in instance 1 of TR8ATCC and so on.
The parameter corresponding to the own IED must not be set.
should thus not be set in IED
UDeadband (based on percentage of nominal bus voltage) and
USet for each transformer.
equal to
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
= × ×
Ci Icc i Xi _
T1 ) the measured voltage by Udi and compares Ui against the voltage
(Equation 117)
(Equation 118)
× × > -
_ 2
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T1 , T2RXOP not in IED T2 and so on.
t1 ) and subsequent ( t2 ) tap change commands from
B
UDeadband . Expressed by equation
(for the purposes of this test procedure)
Uset
Testing functionality by secondary injection
I2Base and a
I2Base . This will
T2 ) or decreases (for
so that Ui is outside the voltage
117 and equation 118.
Section 11
T1RXOP
(Equation 115)
(Equation 116)
(Equation 119)
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