ABB Relion 670 Series REL670 Commissioning Manual page 174

Section 10
Testing functionality by secondary injection
168
StartCurr CT sec
IBase
× ×
100 CTprim
IECEQUATION2432 V1 EN
Second part of the characteristic (25% of UBase ≤ Restrain voltage ≤
UHighLimit/100*UBase), valid when setting parameter VDepMode = Slope:

 

StartCurr CT sec VDepFact
× ×  × −

 IBase  1

 100 CTprim 

( )

−
25
UH i i ghLimit VT
× ×
 
UBase
100 VTprim

IECEQUATION2433 V1 EN
Third part of the characteristic (UHighLimit/100*UBase ≤ Restrain voltage):
StartCurr CT sec
IBase
× ×
100
CTprim
IECEQUATION2434 V1 EN
Example (rated secondary current = 1A):
CT ratio
VT ratio
StartCurr
VDepFact
UHighLimit
IBase
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:
VDepFact
×
100




100
25
× − ×

Re strainVoltage U U Base
sec  100
10 000/1A
10 kV/100 V
100%
25%
100%
10 000 A
10 kV
Line distance protection REL670 2.1 IEC
1MRK 506 355-UEN A
(Equation 89)


 
VT sec  StartCurr C C T sec
× + × ×
 
IBase

VTprim   100 CTprim
 

(Equation 91)
Commissioning manual

VDepFact
×

100 
(Equation 90)