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Section 10
Testing functionality by secondary injection
10.5.1.2
10.5.1.3
82
to be tested is unblocked and other functions that might disturb the evaluation of
the test are blocked.
2.
Connect the test set for injection of three-phase currents to the appropriate
current terminals of the IED.
3.
Inject current(s) in a way that relevant measured current (according to setting
parameter CurrentInput) is created from the test set. Increase the current(s) until
the low set stage operates and check against the set operate value.
4.
Decrease the current slowly and check the reset value.
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.
Information on how to use the event menu is found in the
operator's manual.
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.
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.
1MRK 504 160-UEN -
Transformer protection RET650 2.1 IEC
Commissioning manual
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