ABB Relion 670 series - Page 56

3 Necessary connection for three-phase metrosil set.
4 Position of optional test switch for secondary injection into the high impedance differential IED.
5 Necessary connection for setting resistors.
6 Factory-made star point on a three-phase setting resistor set.
The star point connector must be removed for installations with 670 series
IEDs. This star point is required for RADHA schemes only.
7 Connections of three individual phase currents for high impedance scheme to three CT inputs
in the IED.
Connections for 1Ph High impedance differential protection HZPDIF
GUID-D68A237F-610C-4AF0-870F-273117F64D92 v10
Restricted earth fault protection is a typical application for 1Ph High impedance
differential protection HZPDIF. Typical CT connections for the high impedance
based protection scheme are shown in figure 25.
L1
(A)
L2
(B)
L3
(C)
Protected Object
CT 1500/5
Star/Wye
Connected
7
8
9
10
11
12
1
2
3
4
5
6
AI01 (I)
AI02 (I)
AI03 (I)
AI04 (I)
AI05 (I)
AI06 (I)
IED
X1
R1
1
2
4 5
U
R2
1
3
4
2
1 2 3
N
1-Ph Plate with Metrosil and Resistor
N
L1
(A)
L2
(B)
L3
(C)
CT 1500/5
=IEC07000194=5=en=Original.vsdx
SMAI2
BLOCK
REVROT
^GRP2L1
^GRP2L2
^GRP2L3
^GRP2N
G2AI3P
G2AI1
G2AI2
G2AI3
G2AI4
G2N
1
2
3
4
5
6
IEC07000194 V5 EN-US
Figure 25: CT connections for restricted earth fault protection
Pos
Description
1 Scheme earthing point
Ensure that only one earthing point exists in this scheme.
Section 6 1MRK 514 026-UEN B
Connecting
50 670 series 2.2 IEC
Installation manual