ABB Relion 670 Series Commissioning Manual page 126

Section 11
Testing functionality by secondary injection
where:
t
I
StartCurr Set operate value
This means that if the measured phase current jumps from 0 to 2 times the set operate
level and time multiplier k is set to 1.0 s (default value), then the TROC and TRIP signals
will operate after a time delay equal to 13.5 s ± tolerance.
Taking into account the above explanation, inject the voltages related to the last part of
the characteristic and inject a current IL1 200% higher than the set operation level, and
check the trip time delay.
10. Check the start and operate information that are stored in the event menu.
11. The previous step 8 or 9 may be repeated also for the first and second section of the
characteristic.
12. Supply the IED with symmetric three-phase voltages at their rated values. Go to Main
menu/Settings/IED Settings/Current protection/VoltageRestOverCurr(51V,2(I>/U<))/
VRPVOC(51V,2(I>/U<)):1/Undervoltage and set the setting
activate the undervoltage stage.
13. Slowly decrease the voltage in two phases simultaneously, until the STUV and START
signals appear.
14. Note the operate value. The set operate value in secondary volts is calculated according
to the following equation:
StartVolt UBase
IECEQUATION2436 V1 EN-US
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
20. Check that start and operate information is stored in the event menu.
120
Operate time in seconds
Measured value (for example, phase current)
If tDef_OC is set to a value different from 0 s, then this time delay is
added to the one that is defined by the IDMT characteristic.
VT
sec
× ×
100 VTprim
3
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.
tDef_UV .
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1MRK 511 403-UEN E
Operation_UV = On to
(Equation 19)
Bay control REC670
Commissioning manual