ABB REG670 Commissioning Manual page 206

Section 13
Testing functionality by secondary injection
200
the characteristic and inject a current IL1 200% higher than the set operation
level, and check the definite time delay for trip (the signals TROC and TRIP
of the protection function VRPVOC are active in trip condition).
9. If inverse time delay is used for the overcurrent step, the parameter setting
Characterist shall be properly set; we can refer, for example, to the setting
IEC Very inv.; If the IEC Very inverse time characteristic is selected, the trip
signals TROC and TRIP will operate after a time defined by the equation:
13 5 . * k
t s
[ ]
=
I
 
1
 −

StartCurr
 
IECEQUATION2435 V1 EN-US
where:
t Operate time in seconds
I Measured value (for example, phase current)
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.
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.
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 Operation_UV = On to 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 VT
× ×
100 VTprim
3
IECEQUATION2436 V1 EN-US
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
sec
1MRK 502 073-UEN A
(Equation 92)
(Equation 93)
Commissioning manual