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1MRK 505 372-UEN Rev. K
The current restraining value has also to be measured or calculated and the influence on the
operation has to be calculated when the testing of the operate value is done.
10.7.2.3
Overcurrent feature with voltage restraint
Procedure
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.
Overall check in principal as above (non-directional overcurrent feature)
3.
Operate value measurement
The relevant voltage restraining value (according to setting parameter VoltageInput) has also to
be injected from the test set and the influence on the operate value has to be calculated when
testing of the operate value is done.
4.
Operate time measurement
Definite times may be tested as above (non-directional overcurrent feature). For inverse time
characteristics the START value (to which the overcurrent ratio has to be calculated) is the
actual pickup value as got with actual restraining from the voltage restraining quantity.
10.7.2.4
Overcurrent feature with directionality
Please note that the directional characteristic can be set in two different ways either just dependent
on the angle between current and polarizing voltage (setting parameter DirPrinc_OC1 or
DirPrinc_OC2 set to or in a way that the operate value also is dependent on the angle between
current and polarizing voltage according to the I · cos(F) law (setting parameter DirPrinc_OC1 or
DirPrinc_OC2 set to I · cos(F). This has to be known if a more detailed measurement of the
directional characteristic is made, than the one described below.
Procedure
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.
10.7.2.5
Over/Undervoltage feature
Procedure
Busbar protection REB670
Commissioning manual
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Section 10
Testing functionality by secondary injection
SEMOD56488-44 v5
SEMOD56488-60 v5
SEMOD56488-83 v2
111
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