Setting Guidelines - ABB REG670 Applications Manual

Section 7
Differential protection
7.2.4
7.2.4.1
158
L1 L2
(A) (B)
CT 1500/5
Star/Wye
Connected
Protected Object
L1 L2
(A) (B)
IEC07000194 V5 EN
Figure 62: CT connections for restricted earth fault protection
Pos Description
1 Scheme earthing point
Ensure that only one earthing point exists in this scheme.
2 One-phase plate with stabilizing resistor and metrosil. Protective earth is a separate 4 mm screw
terminal on the plate.
3 Necessary connection for the metrosil.
4 Position of optional test switch for secondary injection into the high impedance differential IED.
5 Necessary connection for stabilizing resistor.
6 How to connect the high impedance restricted earth fault protection scheme to one CT input in
IED.

Setting guidelines

The setting calculations are individual for each application. Refer to the different
application descriptions below.
Configuration
The configuration is done in the Application Configuration tool.
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
L3
(C)
1
2
3
4
5
6
6
7
8
9
10
11
12
L3
N
(C)
1
N
X1 4 5
2
1-Ph Plate with Metrosil and Resistor
1MRK 502 071-UEN -
AI01 (I)
AI02 (I)
SMAI2
BLOCK
REVROT
AI03 (I)
^GRP2L1
^GRP2L2
AI04 (I) ^GRP2L3
^GRP2N
AI05 (I)
AI06 (I)
4
1 2 3
3
5
=IEC07000194=5=en=Original.vsdx
Application manual
G2AI3P
G2AI1
G2AI2
G2AI3
G2AI4
G2N
IED