Tapped Line Application - ABB RELION 670 SERIES REG670 Applications Manual

Section 8
Impedance protection
8.3.2.7
242
This means that the reach is reduced in reactive and resistive directions. If the real and
imaginary components of the constant A are equal to equation
= × × +
Re( ) A R 0 (2 R 1 R
EQUATION1285 V1 EN-US
= × × +
Im( ) A X (2 R R
0 1
EQUATION1286 V1 EN-US
The real component of the KU factor is equal to equation 95.
( )
Re
( )
Re K = + 1
u
( )
 
Re
A
 
EQUATION1287 V3 EN-US
The imaginary component of the same factor is equal to equation 96.
( )
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

Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
+ × - × + ×
0 3 Rf ) X 0 ( 0 2 X
+ × + × × +
3 R ) R (2 X
0 1 0 1
2
⋅
A X
0
m
2 2
( )
 
+ Im
A
 
×
2
m 0
( )
2
é ù
Im A
ë û
1MRK 502 071-UUS A
93 and equation 94.
X 1)
X )
0
GUID-4DFD6015-E97C-4F7E-84CA-C7CD2438C55A v1
Application manual
(Equation 93)
(Equation 94)
(Equation 95)
(Equation 96)