ABB REG670 2.0 IEC - Page 178

StartCurr
IBase
CT
CTprim100
× ×
sec
IECEQUATION2434 V1 EN (Equation 91)
Example (rated secondary current = 1A):
CT ratio
10 000/1A
VT ratio 10 kV/100 V
StartCurr 100%
VDepFact 25%
UHighLimit 100%
IBase 10 000 A
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*UBase; if VDepMode = Step, the minimum measured phase-to-phase
voltage is lower than UHighLimit/100*UBase:
• UL1: Ampl = 10 / √3; Angle = 0°
• UL2: Ampl = 10 / √3; Angle = 240°
• UL3: 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*UBase and UHighLimit/100*UBase:
• UL1: Ampl = 50 / √3; Angle = 0°
• UL2: Ampl = 50 / √3; Angle = 240°
• UL3: 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 UHighLimit/100*UBase:
• UL1: Ampl = 105/ √3; Angle = 0°
• UL2: Ampl = 105/ √3; Angle = 240°
• UL3: 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 IL1 from 0.0 A up to the value the function
operates. The START and STOC signals must be activated when the amplitude
of the phase current IL1 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 IL1 slowly and note the reset value.
Section 12 1MRK502053-UEN B
Testing functionality by secondary injection
172 Generator protection REG670 2.0 IEC
Commissioning manual