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. Trip 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 trip value has to be calculated when testing of
the trip value is done.
4. Trip time measurement
Definite times may be tested as above (non-directional overcurrent feature). For inverse time
characteristics the PICKUP 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.
11.9.2.4 Overcurrent feature with directionality
SEMOD56488-60 v5
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 trip 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 CTWYEpoint
configuration parameter is set to ToObject.
If reverse directional feature is selected or CTWYEpoint 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 trip.
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
SEMOD56488-83 v2
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.
1MRK 504 165-UUS Rev. J Section 11
Testing functionality by secondary injection
Transformer protection RET670 233
Commissioning manual
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