ABB RELION 670 SERIES REG670 - Series Compensated and Adjacent Lines; Setting of Reverse Zone

Z
V
I
Z
I I
I
Z
I I I
I
R Z
I
I
Z
AF
A
A
AC
A C
A
CF
A C B
A
F
AC
C
A
C
= = +
+
⋅ +
+ +
⋅ = + +






⋅1
FF
C B
A
F
I I
I
R+ +
+






⋅1
EQUATION302 V5 EN-US (Equation 121)
A
B
21
C
I
A
IB
Z
AC
Z
CB
Z
CF
I
A+
I
B
ANSI05000457-2-en.vsd
F
ANSI05000457 V2 EN-US
Figure 129: Setting of overreaching zone
8.3.4.4 Setting of reverse zone
GUID-C08EC148-B90C-4A20-8993-707E63545946 v2
The reverse zone (zone RV) is applicable for purposes of scheme communication logic,
current reversal logic, weak-end infeed logic, and so on. The same applies to the back-
up protection of the bus bar or power transformers. It is necessary to secure, that it
always covers the overreaching zone, used at the remote line IED for the
telecommunication purposes.
Consider the possible enlarging factor that might exist due to fault infeed from adjacent
lines. The equation can be used to calculate the reach in reverse direction when the
zone is used for blocking scheme, weak-end infeed, and so on.
Zrev 1.2 × (
Z2rem - ZL)
>
_
GUID-ABFB1C53-F12A-45D5-90CC-907C9FA0EFC3 V1 EN-US (Equation 122)
Where:
ZL is the protected line impedance.
Z2rem is the zone 2 setting (zone used in the POTT scheme) at the remote end of the protected line.
In many applications it might be necessary to consider the enlarging factor due to the
fault current infeed from adjacent lines in the reverse direction in order to obtain
certain sensitivity
.
8.3.4.5 Series compensated and adjacent lines
GUID-33C23BA9-5807-4E9E-859A-12D6A76304C0 v1
1MRK 502 071-UUS A Section 8
Impedance protection
Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062 267
Application manual