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1MRK 504 165-UEN Rev. K
5.
Block high set stage if the injection current will activate the high set stage when testing the low
set stage according to below.
6.
Connect a TRIP output contact to the timer.
7.
Set the current to 200% of the operate value of low set stage, switch on the current and check
the time delay.
For inverse time curves, check the operate time at a current equal to 110% of the operate
current at tMin.
8.
Check that TRIP and START contacts operate according to the configuration logic.
9.
Release the blocking of the high set stage and check the operate and reset value and the time
delay for the high set stage in the same way as for the low set stage.
10.
Finally check that START and TRIP information is stored in the event menu.
11.9.2.2
Overcurrent feature with current restraint
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.
Procedure
1.
Operate value measurement
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.
11.9.2.3
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.
11.9.2.4
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
Transformer protection RET670
Commissioning manual
Information on how to use the event menu is found in the operator's manual.
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Section 11
Testing functionality by secondary injection
SEMOD56488-35 v3
SEMOD56488-44 v5
SEMOD56488-60 v5
221
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