ABB Relion 670 Series Commissioning Manual page 205

1MRK 504 165-UUS Rev. J
If VDepMode = Slope, the minimum measured phase-to-phase voltage is lower than 0,25*VBase; if
VDepMode = Step, the minimum measured phase-to-phase voltage is lower than VHighLimit/
100*VBase:
•
•
•
Second section of the characteristic only:
If VDepMode = Slope, the minimum measured phase-to-phase voltage is between 0,25*VBase and
VHighLimit/100*VBase:
•
•
•
Last section of the characteristic:
If VDepMode = either Slope or Step, the minimum measured phase-to-phase voltage is higher than
VHighLimit/100*VBase:
•
•
•
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
Transformer protection RET670
Commissioning manual
VA: Ampl = 10 / √3; Angle = 0°
VB: Ampl = 10 / √3; Angle = 240°
VC: Ampl = 100 / √3; Angle = 120°
VA: Ampl = 50 / √3; Angle = 0°
VB: Ampl = 50 / √3; Angle = 240°
VC: Ampl = 100 / √3; Angle = 120°
VA: Ampl = 105/ √3; Angle = 0°
VB: Ampl = 105/ √3; Angle = 240°
VC: Ampl = 105 / √3; Angle = 120°
13 5 . * k
=
 
I
 −

1
 Pickup Curr _ 
Trip time in seconds
Measured value (for example, phase current)
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Section 11
Testing functionality by secondary injection
(Equation 98)
199