Setting Guidelines - ABB REC670 Applications Manual

1MRK 511 401-UUS A
7.1.4
Bay control REC670 2.2 ANSI
Application manual
L1 L2
(A) (B)
CT 1500/5
Star/Wye
Connected
Protected Object
L1 L2
(A) (B)
ANSI09000170 V5 EN-US
Figure 51: CT connections for restricted earth fault protection
Pos Description
1 Scheme grounding point
Ensure that only one grounding point exists in this scheme.
2 One-phase plate with stabilizing resistor and metrosil. Protective ground 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.
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
Differential protection
AI01 (I)
AI02 (I) SMAI2
BLOCK
REVROT
AI03 (I)
^GRP2_A
^GRP2_B
^GRP2_C
AI04 (I)
^GRP2_N
AI05 (I)
AI06 (I)
IED
4
1 2 3
3
5
Section 7
G2AI3P
G2AI1
G2AI2
G2AI3
G2AI4
G2N
ANSI09000170-5-en.vsdx
IP14945-1 v1
M13076-3 v2
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