Check The Overcurrent Block Function; Single Transformer - Hitachi Relion 670 Series Commissioning Manual
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1MRK 511 403-UEN Rev. L
TR1ATCC(90, U↕):x/TR8ATCC(90, U↕||):x /OVPartBk. These conditions may cause an alarm
or total block of the voltage control function to be displayed on the local HMI.
3.
Decrease the injected voltage slightly below the Umin value and check for the corresponding
blocking or alarm condition on the local HMI. For an alarm condition, the voltage regulation
function is not blocked and a raise command should be issued from the IED.
4.
Increase the applied voltage slightly above the Umax value and check for the corresponding
blocking or alarm condition on the local HMI. For an alarm condition, the voltage regulation
function is not blocked and a lower command should be issued from the IED.
11.10.5.6
Check the overcurrent block function
1.
Confirm the setting for Iblock in the local HMI under Main menu /Settings /IED Settings /
Control /TransformerVoltageControl(90, U↕) /TR1ATCC(90, U↕):x/TR8ATCC(90, U↕||):x /
TCCtrl /Iblock
2.
Confirm the voltage control function response to an applied current above Iblock, by reviewing
the settings in the local HMI under Main menu /Settings /IED Settings /Control /
TransformerVoltageControl(90, U↕) /TR1ATCC(90, U↕):x/TR8ATCC(90, U↕||):x /OVPartBk.
This condition may cause an alarm or total block of the voltage control function to be displayed
on the local HMI.
3.
Inject a current higher than the Iblock setting and confirm the alarm or blocking condition is
present on the local HMI. If an automatic or total blocking condition occurs, change the applied
secondary voltage and confirm that no tap change commands are issued from the associated
binary outputs. This situation can also be confirmed through reviewing the disturbance and
service reports on the local HMI.
11.10.5.7
Single transformer
Load drop compensation
1.
Confirm that OperationLDC is set to On.
2.
Confirm settings for Rline and Xline.
3.
Calculate the expected load voltage U
based on secondary injection of transformer secondary voltage (U
current (I
EQUATION2080 V3 EN-US
where:
U
When all secondary phase-to-earth voltages are available, use the positive-sequence
components of voltage and current. By separation of real and imaginary parts:
ul re ub re rline il re
EQUATION2082 V1 EN-US
Bay control REC670
Commissioning manual
= I1Base), in accordance with equation 41.
L
, I
= Re(I
) + jlm(I
) are complex phase quantities
L
L
L
L
=
-
×
+
,
,
,
xline il im
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(displayed as a measured value on the local HMI)
L
×
,
Section 11
Testing functionality by secondary injection
SEMOD175185-605 v7
SEMOD175185-669 v2
SEMOD175185-672 v5
= USet) and rated load
B
(Equation 41)
(Equation 42)
173
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