Connection Examples For High Impedance Differential Protection - Hitachi 670 Series Installation Manual
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- Applications manual (438 pages) ,
- Commissioning manual (284 pages) ,
- Product manual (192 pages)
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Section 6
Connecting
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:
Pos
1
2
3
4
46
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)
CT connections for high impedance differential protection
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.
Position of optional test switch for secondary injection into the high impedance differential 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
X1
11
12
13
14
2
3
3-Ph Plate with Metrosils and Resistors
1MRK514026-UUS Rev. P
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
Installation manual
670 series
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