ABB Relion REG670, Applications Manual

Page: 232 / 780

0 1 0 1 0 1 0
Im( ) (2 3 ) (2 ) A X R R R R X X
= × × + + × + × × +
EQUATION1286 V1 EN
(Equation 99)
The real component of the KU factor is equal to equation 54 .
Re
Re
Re Im
K
A X
A A
u
m
( )
= +
( )
⋅
( )




+
( )




1
0
2
2 2
EQUATION1287 V3 EN
(Equation 100)
The imaginary component of the same factor is equal to equation 55 .
( )
( )
( ) ( )
2
0
2 2
Im
Im
Re Im
m
U
A X
K
A A
×
=
+
é ù é ù
ë û ë û
EQUATION1288 V2 EN
(Equation 101)
Ensure that the underreaching zones from both line ends will overlap a sufficient
amount (at least 10%) in the middle of the protected circuit.
8.3.2.7 Tapped line application
C
B
BC
IEC09000160-3-en.vsd
A
IEC09000160 V3 EN
Figure 105: Example of tapped line with Auto transformer
Section 8
1MRK 502 071-UEN -
Impedance protection
226 Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual