VTmismatch during parallel operation
SEMOD175185-859 v4
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 V
B
equal to VSet for Transformer 1 and a voltage less than (VSet – (VTmismatch ·
VSet)) 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 (90) 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 (90)
responds in accordance with the setting for CircCurrBk.
11.11.5.9 Completing the test
SEMOD175185-374 v4
Continue to test another function or end the test by changing the TESTMODE setting to Disabled.
Restore connections and settings to the original values, if changed for testing purposes.
11.11.6 Single command, 16 signals SINGLECMD
SEMOD172444-5 v3
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.
11.11.7 Interlocking
M11755-2 v9
Prepare the IED for verification of settings as outlined in section
"Requirements" and section "Preparing
for test" in this chapter.
Values of the logical signals are available on the local HMI under Main menu /Tests /Function status /
Control /Apparatus control /Interlocking . The Signal Monitoring in PCM600 shows the same signals
that are available on the local HMI.
The interlocking function consists of a bay-level part and a station-level part. The interlocking is delivery
specific and is realized by bay-to-bay communication over the station bus. For that reason, test the
function in a system, that is, either in a complete delivery system as an acceptance test (FAT/SAT) or as
parts of that system.
11.12 Scheme communication
SEMOD53569-1 v1
11.12.1 Scheme communication logic for distance or overcurrent
protection ZCPSCH (85)
M13868-2 v7
Prepare the IED for verification of settings as outlined in section
"Requirements" and section "Preparing
for test" in this chapter.
Check the scheme logic during the secondary injection test of the impedance or overcurrent protection
functions.
Section 11 1MRK 504 165-UUS Rev. J
Testing functionality by secondary injection
262 Transformer protection RET670
Commissioning manual
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