Connections For 1Ph High Impedance Differential Protection Hzpdif (87) - ABB Relion 670 Series Applications Manual

1MRK 511 358-UUS A
3
4
5
6
7
6.1.3.2

Connections for 1Ph High impedance differential protection HZPDIF (87)

Restricted earth fault protection is a typical application for 1Ph High impedance differential
protection HZPDIF (87). Typical CT connections for the high impedance based protection scheme
are shown in figure 47.
L1
(A)
CT 1500/5
Star/Wye
Connected
L1
(A)
ANSI09000170 V4 EN-US
Figure 47: CT connections for restricted earth fault protection
Pos
1
Application manual
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 670 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.
L2 L3
(B) (C)
Protected Object
L2 L3
(B) (C)
1
Description
Scheme grounding point
Ensure that only one grounding point exists in this scheme.
1
AI01 (I)
2
3
AI02 (I)
4
5
AI03 (I)
6
6
7
AI04 (I)
8
9
AI05 (I)
10
11
AI06 (I)
12
N
4
N
X1 4 5
2
3
1-Ph Plate with Metrosil and Resistor
Differential protection
GUID-D68A237F-610C-4AF0-870F-273117F64D92 v10
SMAI2
BLOCK AI3P
^GRP2_A AI1
^GRP2_B AI2
^GRP2_C AI3
^GRP2_N AI4
TYPE AIN
1 2 3
5
ANSI09000170_4_en.vsd
Section 6
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