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Section 11
Testing functionality by secondary injection
1.
Connect the test set for injection of three-phase currents and three-phase voltages to the
appropriate current and voltage terminals of the IED.
2.
Inject current(s) and voltage(s) in a way that relevant measured (according to setting parameter
CurrentInput and VoltageInput) currents and voltages are created from the test set.
3.
Set the relevant measuring quantity current to lag or lead (lag for negative RCA angle and lead
for positive RCA angle) the relevant polarizing quantity voltage by an angle equal to the set IED
characteristic angle (rca-dir) when forward directional feature is selected and the CTstarpoint
configuration parameter is set to ToObject.
If reverse directional feature is selected or CTstarpoint configuration parameter is set to
FromObject, the angle between current and polarizing voltage shall be set equal to rca-dir
+180°.
4.
Overall check in principal as above (non-directional overcurrent feature)
5.
Reverse the direction of the injection current and check that the protection does not operate.
6.
Check with low polarization voltage that the feature becomes non-directional, blocked or with
memory according to the setting.
11.9.2.5
Over/Undervoltage feature
Procedure
1.
Connect the test set for injection three-phase voltages to the appropriate voltage terminals of
the IED.
2.
Inject voltage(s) in a way that relevant measured (according to setting parameter VoltageInput)
voltages are created from the test set.
3.
Overall check in principal as above (non-directional overcurrent feature) and correspondingly
for the undervoltage feature.
11.9.2.6
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
Secondary system supervision
11.10.1
Current circuit supervision CCSSPVC
Prepare the IED for verification of settings outlined in Section
The Current circuit supervision function CCSSPVC is conveniently tested with the same three-phase
test set as used when testing the measuring functions in the IED.
The condition for this procedure is that the setting of IMinOp is lower than the setting of Ip>Block.
11.10.1.1
Verifying the settings
1.
Check the input circuits and the operate value of the IMinOp current level detector by injecting
current, one phase at a time.
2.
Check the phase current blocking function for all three phases by injecting current, one phase
at a time. The output signals shall reset with a delay of 1 second when the current exceeds 1.5
· IBase.
3.
Inject a current 0.1 · IBase to the reference current input I5.
4.
Increase slowly the current in one of the phases and check that FAIL output is obtained when
the current is above 0.9 · IBase.
222
© 2017 - 2022 Hitachi Energy. All rights reserved
1MRK 504 165-UEN Rev. K
"Preparing the IED to verify
Transformer protection RET670
Commissioning manual
SEMOD56488-83 v2
SEMOD56488-99 v2
SEMOD53556-1 v1
M12917-25 v8
settings".
M12917-31 v8
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