ABB Relion 670 series - Page 317

( ) ( )
arg 1 arg
set pAB AB ol
I ZV V b -×= -
ANSIEQUATION15027 V1 EN-US (Equation 84)
where
AB
V
EQUATION1790-ANSI V1 EN-US
is the voltage vector difference between phases A and B
AB
I
EQUATION1791-ANSI V1 EN-US
is the current vector difference between phases A and B
Z set1 
is the positive sequence impedance setting for phase-to-phase fault in zone direction
For Zone 1,
Z R PPZ j X PPZ
set
1 1 1 1 1= + ⋅
IECEQUATION15011 V1 EN-US (Equation 85)
where
R1PPZ1 is the positive sequence resistive reach for phase-to-phase fault for zone 1
X1PPZ1 is the positive sequence reactance reach for phase-to-phase fault for zone 1
For Zone 2-5 and RV
Z R Zx j X Zx
set
1 1 1= + ⋅
IECEQUATION15012 V1 EN-US (Equation 86)
where
R1Zx is the positive sequence resistive reach for zone x (x=2-5 and RV)
X1Zx is the positive sequence reactance reach for zone x (x=2-5 and RV)
Vpol
is the polarizing voltage
Operation occurs if 90°≤β≤270°
1MRK 502 066-UUS B Section 7
Impedance protection
311
Technical manual