If the VRPVOC function is used as an overcurrent protection with
undervoltage seal-in, it is necessary to first inject sufficient current to
activate the STOC signal before the under-voltage step is allowed to
operate. In order to achieve that, apply symmetric three-phase voltages at
their rated value and then inject a current IL1 that is 200% higher than the
set operation level. Then slowly decrease the voltage in two phases
simultaneously, until the STUV and START signals appear.
15. Increase slowly the applied voltages of the previous two phases and note the reset value.
16. Check that the trip output of the relay is connected to the input channel of the test in
order to stop the injection and measure the trip time.
17.
Inject symmetric three-phase voltages at their rated value and check that the STUV and
START signals reset as well as the trip signals of the function block (TRIP and TRUV).
18. Instantaneously decrease the voltage in two phases simultaneously to a value 20% lower
than the set operate value (take into account the previous note if VRPVOC is configured
in ACT with the undervoltage seal-in feature).
19. Measure the definite time delay for the TRUV and TRIP signals and compare it with the
set value
tDef_UV.
20. Check that start and operate information is stored in the event menu.
12.5.18.2
Completing the test
GUID-8A33AACE-7B89-4981-A872-78044BB1FD0D v2
Continue to test another function or end the test by changing the
TestMode setting to Off.
Restore connections and settings to their original values, if they were changed for testing
purposes.
12.5.19
Generator stator overload protection GSPTTR
GUID-A0B3EA43-7EEC-4FCC-A5BF-44BB8A8055E0 v1
12.5.19.1
Verifying the settings
GUID-6B85A379-E977-48CC-B15C-4AF3EAB78478 v2
Explained testing method is given for default value for the
k1 parameter.
The function has heating content memory features. Thus if testing shots are done
consecutively, operate time will be shorten accordingly, compared to the given operate
characteristic. Therefore either wait until set
tReset time has elapsed, between two shots, or
reset this memory by setting the RESET input into the function to value TRUE
1.
Connect the test set for the appropriate three-phase current injection to the IED phases
L1, L2 and L3. The protection shall be fed with a symmetrical three-phase current.
2.
Set the injected current to 116% of IBase, switch on the current and check operate time of
the trip, 120 s.
3.
Decrease the current slowly.
4.
The output signal START will reset if the measured current falls below reset level or if
BLOCK signal is set to one.
5.
Switch off the current.
6.
Set the injected current to 120% of IBase, switch on the current and check operate time
of the trip, 60 s.
7.
Switch off the current.
8.
Set the injected current to 154% of IBase, switch on the current and check operate time
of the trip, 30 s.
9.
Switch off the current.
1MRK 502 067-UEN B
Section 12
Testing functionality by secondary injection
181
Commissioning manual