ABB REG670 - Page 220

Third part of the characteristic (VHighLimit/100*VBase ≤ Restrain voltage):
Picup Curr
IBase
CT
CTprim
_ sec
100
× ×
ANSIEQUATION2434 V1 EN-US (Equation 91)
Example (rated secondary current = 5A):
CT ratio 10 000/5A
VT ratio 10 kV/100 V
Pickup_Curr 100%
VDepFact 25%
VHighLimit 100%
IBase 10 000 A
VBase 10 kV
A test for each section of the characteristic of the function VRPVOC may be
performed; that may be achieved by applying the following voltages:
First section of the characteristic:
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:
• VA: Ampl = 10 / √3; Angle = 0°
• VB: Ampl = 10 / √3; Angle = 240°
• VC: Ampl = 100 / √3; Angle = 120°
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:
• VA: Ampl = 50 / √3; Angle = 0°
• VB: Ampl = 50 / √3; Angle = 240°
• VC: Ampl = 100 / √3; Angle = 120°
Last section of the characteristic:
If VDepMode = either Slope or Step, the minimum measured phase-to-phase
voltage is higher than VHighLimit/100*VBase:
• VA: Ampl = 105/ √3; Angle = 0°
• VB: Ampl = 105/ √3; Angle = 240°
• VC: Ampl = 105 / √3; Angle = 120°
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
Section 13 1MRK 502 073-UUS A
Testing functionality by secondary injection
214 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Commissioning manual