Connection Examples For High Impedance Differential Protection - ABB Relion 670 Series Installation Manual

1MRK 514 026-UUS F
6.1.1.4

Connection examples for high impedance differential protection

Connections for three-phase high impedance differential protection
Generator, reactor or busbar differential protection is a typical application for three-phase high
impedance differential protection. Typical CT connections for three-phase high impedance
differential protection scheme are shown in figure 24.
CT 1200/1
Star/Wye
Connected
CT 1200/1
Star/Wye
Connected
ANSI09000169 V4 EN-US
Figure 24: CT connections for high impedance differential protection
Pos
1
2
3
670 series
Installation manual
WARNING! USE EXTREME CAUTION! Dangerously high voltages might be present
on this equipment, especially on the plate with resistors. De-energize the primary
object protected with this equipment before connecting or disconnecting wiring or
performing any maintenance. The plate with resistors should be provided with a
protective cover, mounted in a separate box or in a locked cubicle. National law and
standards shall be followed.
L1 L2 L3
(A) (B) (C)
1
Protected Object
L1 L2 L3
(A) (B) (C)
Description
Scheme grounding point
It is important to insure that only one grounding point exist in this scheme.
Three-phase plate with setting resistors and metrosils. Protective ground is a separate 4 mm screw
terminal on the plate.
Necessary connection for three-phase metrosil set.
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
GUID-8C58A73D-7C2E-4BE5-AB87-B4C93FB7D62B v5
GUID-C12CCAAF-5AE5-4A9C-AC9C-F56A66FD2C14 v8
SMAI2
BLOCK G2AI3P
REVROT G2AI1
^GRP2_A G2AI2
^GRP2_B G2AI3
^GRP2_C G2AI4
^GRP2_N G2N
IED
4
5
2 3 4 5 6 7
X X
6
ANSI09000169-4-en.vsdx
Section 6
Connecting
45