Tapped Line Application - ABB REG670 Applications Manual

Section 8
Impedance protection
8.3.2.7
226
= × × +
Im( ) A X (2 R R
0 1
EQUATION1286 V1 EN
The real component of the KU factor is equal to equation 54.
Re
( )
K = +
Re 1
u
( )

A
Re

EQUATION1287 V3 EN
The imaginary component of the same factor is equal to equation 55.
( )
Im A X
( )
=
Im K
U
( )
2
é ù
Re A
ë û
EQUATION1288 V2 EN
Ensure that the underreaching zones from both line ends will overlap a sufficient
amount (at least 10%) in the middle of the protected circuit.

Tapped line application

A
IEC09000160 V3 EN
Figure 105: Example of tapped line with Auto transformer
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
+ × + × ×
3 R ) R (2 X
0 1 0 1
( )
2
A X ⋅
m
0
2 2
( )
  
+ A
Im
  
×
2
m 0
( )
2
é ù
+
Im A
ë û
C
1MRK 502 071-UEN -
+
X )
0
B
BC
IEC09000160-3-en.vsd
Application manual
(Equation 99)
(Equation 100)
(Equation 101)