ABB Relion 670 Series Commissioning Manual page 128

Section 11
Testing functionality by secondary injection
4. Inject the voltages that are related to the first part of the characteristic, and then slowly increase the
phase current IA from 0.0 A up to the value the function trips. The PICKUP and STOC signals must
be activated when the amplitude of the phase current IA is slightly above 0.25 A on the secondary
side. The 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:
[ ]
t s
ANSIEQUATION2435 V1 EN-US
where:
t
I
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.
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 /VoltageRestOverCurr(51V,2(I>/V<)) /
VRPVOC(51V,2(I>/V<)):1 /Undervoltage and set the setting Operation_UV = Enabled to activate
the undervoltage stage.
13. Slowly decrease the voltage in two phases simultaneously, until the STUV and PICKUP signals
appear.
14. Note the trip value. The set trip value in secondary volts is calculated according to the following
equation:
122
13 5 . * k
=
 
I
 −
 1
 
Pickup Curr _
Trip 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.
© 2017 - 2021 Hitachi Power Grids. All rights reserved
1MRK 511 403-UUS Rev. K
(Equation 18)
Bay control REC670
Commissioning manual