14. Note the operate value. The set operate value in secondary volts is calculated
according to the following equation:
StartVolt
UBase
VT
VTprim
100
3
×
×
sec
IECEQUATION2436 V1 EN
(Equation 93)
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.
12.5.14.2
Completing the test
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.
12.5.15
Generator stator overload protection GSPTTR
12.5.15.1
Verifying the settings
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
Section 12
1MRK502053-UEN B
Testing functionality by secondary injection
174
Generator protection REG670 2.0 IEC
Commissioning manual
Summary of Contents for REG670 2.0 IEC
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