Completing The Test; Single Command, 16 Signals Singlecmd; Interlocking - Hitachi Relion 670 Series Commissioning Manual

1MRK 511 403-UEN Rev. L
12. Confirm that a tap change command is issued from the voltage control function to compensate
for the circulating current.
13. Injected currents can be reversed such that the direction of calculated circulating currents
change polarity, which will cause a lower command for Transformer 2 and a raise command for
Transformer 1.
Circulating current limit
1. Confirm that OperationPAR is set to CC for each transformer in the parallel group.
2. Confirm that OperCCBlock is set to On for each transformer in the parallel group.
3. Review the setting for CircCurrLimit.
4. Review the setting for CircCurrBk to confirm whether a circulating current limit will result in an
Alarm state, Auto Block or Auto&Man Block of the automatic voltage control for tap changer, for
parallel control function TR8ATCC.
5. Inject a voltage U
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 1% less than (I2Base – (I2Base · CircCurrLimit))
7. Confirm that the automatic voltage control for tap changer, for parallel control function
TR8ATCC responds in accordance with the setting for CircCurrBk. Alarm and blocking
conditions can be confirmed through interrogation of the event menu or the control menu on the
local HMI.
VTmismatch during parallel operation
1. Confirm that OperationPAR is set to MF for each transformer in the parallel group.
2. Review the setting for VTmismatch and tVTmismatch.
3. Inject a voltage U
(VTmismatch · USet)) for Transformer 2.
4. This condition should result in a VTmismatch which will mutually block the operation of the
automatic voltage control for tap changer, parallel control function TR8ATCC for all
transformers connected in the parallel group, which can be confirmed through interrogation of
the local HMI.
5. Confirm that the automatic voltage control for tap changer, parallel control function TR8ATCC
responds in accordance with the setting for CircCurrBk.
11.10.5.9

Completing the test

Continue to test another function or end the test by changing the TESTMODE setting to Off. Restore
connections and settings to the original values, if changed for testing purposes.
11.10.6

Single command, 16 signals SINGLECMD

For the single command function block, it is necessary to configure the output signal to
corresponding binary output of the IED. The operation of the single command function
(SINGLECMD) is then checked from the local HMI by applying the commands with Mode = Off,
Steady or Pulse, and by observing the logic statuses of the corresponding binary output. Command
control functions included in the operation of different built-in functions must be tested at the same
time as their corresponding functions.
11.10.7

Interlocking

Prepare the IED for verification of settings as outlined in section
section
Bay control REC670
Commissioning manual
The voltage injection equal to USet is required for both transformers during this test.
equal to USet for each transformer.
B
equal to USet for Transformer 1 and a voltage less than (USet –
B
"Preparing for test" in this chapter.
© 2017 - 2022 Hitachi Energy. All rights reserved
Testing functionality by secondary injection
"Requirements" and
Section 11
SEMOD175185-841 v6
SEMOD175185-859 v4
SEMOD175185-374 v4
SEMOD172444-5 v3
M11755-2 v9
177