ABB Relion 650 Series Installation Manual page 40

Section 6
Connecting
CT 1200/1
Star/Wye
Connected
CT 1200/1
Star/Wye
Connected
IEC07000193 V5 EN-US
Figure 18: CT connections for high impedance differential protection
Pos
1
2
3
4
5
6
7
Connections for 1Ph High impedance differential protection HZPDIF
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 19.
34
L1 L2 L3
(A) (B) (C)
1
Protected Object
L1 L2 L3
(A) (B) (C)
Description
Scheme earthing point
It is important to insure that only one earthing point exist in this scheme.
Three-phase plate with setting resistors and metrosils. Protective earth is a separate 4 mm screw
terminal on the plate.
Necessary connection for three-phase metrosil set.
Position of optional test switch for secondary injection into the high impedance differential IED.
Necessary connection for setting resistors.
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.
Connections of three individual phase currents for high impedance scheme to three CT inputs in the
IED.
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7
1
AI01
2
(I)
3
AI02
4
(I)
5
AI03
6
(I)
7
AI04
8
(I)
9
AI05
1
(I)
0
1
AI06
1
1
(I)
2
N
L3 (C)
L2 (B)
L1 (A)
N
L3 (C)
L2 (B)
L1 (A)
1
11 12 13 14
X1
2
3
3-Ph Plate with Metrosils and Resistors
1MRK 514 027-UEN D
SMAI2
BLOCK G2AI3P
REVROT G2AI1
^GRP2L1 G2AI2
^GRP2L2 G2AI3
^GRP2L3 G2AI4
^GRP2N G2N
IED
4
5
2 3 4 5 6 7
X X
6
IEC07000193-5-en.vsdx
GUID-D68A237F-610C-4AF0-870F-273117F64D92 v10
Installation manual
650 series