L1
(A)
L2
(B)
L3
(C)
Protected Object
CT 1200/1
Star/Wye
Connected
L1
(A)
L2
(B)
L3
(C)
CT 1200/1
Star/Wye
Connected
7
8
9
1
0
1
1
1
2
1
2
3
4
5
6
AI01
(I)
AI02
(I)
AI03
(I)
AI04
(I)
AI05
(I)
AI06
(I)
7
6
X1
R
4
R
5
R
6
1
2
1
2
1
2
11
12
13
14
U
U
U
R
1
1
3
4
2
1
3
R
2
2
4
1
3
R
3
2
4
1
2
3
4
5
6 7
L1 (A)
L2 (B)
L3 (C)
N
3-Ph Plate with Metrosils and Resistors
2
3
5
4
X
X
L1 (A)
L2 (B)
L3 (C)
N
1
IED
IEC07000193-5-en.vsdx
SMAI2
BLOCK
REVROT
^GRP2L1
^GRP2L2
^GRP2L3
^GRP2N
G2AI3P
G2AI1
G2AI2
G2AI3
G2AI4
G2N
IEC07000193 V5 EN-US
Figure 18: CT connections for high impedance differential protection
Pos
Description
1
Scheme earthing point
It is important to insure that only one earthing point exist in this scheme.
2
Three-phase plate with setting resistors and metrosils. Protective earth is a separate 4 mm screw
terminal on the plate.
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 650 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
.
Section 6
1MRK 514 027-UEN D
Connecting
34
650 series
Installation manual
© Copyright 2017 ABB. All rights reserved
