Connections For 1Ph High Impedance Differential Protection Hzpdif - ABB REC670 Applications Manual

Section 7
Differential protection
7.1.3.2
132
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 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

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 51.
L1 L2
(A) (B)
CT 1500/5
Star/Wye
Connected
Protected Object
L1 L2
(A) (B)
IEC07000194 V5 EN-US
Figure 51: CT connections for restricted earth fault protection
L3
(C)
1
2
3
4
5
6
6
7
8
9
10
11
12
L3
N
(C)
1
N
4 5
X1
2
1-Ph Plate with Metrosil and Resistor
1MRK 511 401-UEN A
GUID-D68A237F-610C-4AF0-870F-273117F64D92 v10
AI01 (I)
AI02 (I)
SMAI2
BLOCK
REVROT
AI03 (I)
^GRP2L1
^GRP2L2
AI04 (I)
^GRP2L3
^GRP2N
AI05 (I)
AI06 (I)
4
1 2 3
3
5
=IEC07000194=5=en=Original.vsdx
Bay control REC670 2.2 IEC
Application manual
G2AI3P
G2AI1
G2AI2
G2AI3
G2AI4
G2N
IED