Tapped Line Application - ABB REL670 2.2 IEC Applications Manual

1MRK 506 369-UEN B
8.5.2.8
Line distance protection REL670 2.2 IEC
Application manual
= × × +
Re( ) A R 0 (2 R 1
EQUATION1285 V1 EN-US
= × × +
Im( ) A X (2 R
0 1
EQUATION1286 V1 EN-US
The real component of the KU factor is equal to equation 199.
( )
K = +
Re 1
u

Re

EQUATION1287 V3 EN-US
The imaginary component of the same factor is equal to equation 200.
( )
Im A X
( )
=
Im K
U
( )
2
é ù
+
Re A
ë û
EQUATION1288 V2 EN-US
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

+ × - ×
R 0 3 Rf ) X 0 ( 0 2 X
+ × + × ×
R 3 R ) R (2 X
0 1 0
( )
2
A X ⋅
Re
m
0
2
( ) ( )
  
+
A A
Im
  
× 2
m 0
( )
2
é ù
Im A
ë û
Section 8
Impedance protection
+ ×
X 1)
+
X )
1 0
2
(Equation 197)
(Equation 198)
(Equation 199)
(Equation 200)
SEMOD154680-265 v1
273