ABB REG670 Commissioning Manual page 221

1MRK 502 073-UUS A
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Commissioning manual
corresponding trip signals TROC and TRIP will be activated after the pre-set time
delay has expired.
5. Decrease the current IA slowly and note the reset value.
6. Repeat steps 4 and 5 applying voltages that are related to the second and the last
section of the characteristic; the function trips when IA is slightly higher than: 0.5
A in the second section; 5A in the last section.
7. Connect the trip output contact to the input channel of the test set in order to stop
the injection and measure the trip time.
8. If definite time delay is used for the overcurrent step, set the setting Characterist
= ANSI Def. Time. Apply the voltages related to the last part of the characteristic
and inject a current IA 200% higher than the set tripping 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 trip after a time defined by the equation:
13 5 . * k
t s [ ]
=
I


Pickup Curr _

ANSIEQUATION2435 V1 EN-US
where:
t Trip time in seconds
I Measured value (for example, phase current)
Pickup_Curr Set trip value
This means that if the measured phase current jumps from 0 to 2 times the set trip
level and time multiplier k is set to 1.0 s (default value), then the TROC and
TRIP signals will trip 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 IA 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 pickup and trip 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/
Testing functionality by secondary injection

1
 −

Section 13
(Equation 92)
215