ABB CIRCUIT SHIELD 87T - Page 18

Transformer
Differential
Relay
IB
7.6
.
1.7
-
4
Page
18
TEST SET
Contact
Monitor
a
STOP
a
Figure
10
:
Typical
Test
Connections
+
O
Current Source
#
t
II
60
HZ
Phase
=
o
deg
O
T
Instantaneous
Unit
Pickup
Test
+
o
-
j
Current Source
#
2
iz
If
second
source
required
in
parallel
to
obtain
needed
current
levels
,
connect
as
shown
by
dotted
lines
.
60
HZ
Phase
-
o
deg
O
_
j
CM
+
HH
I
(
+
)
87
T
l
(
-
)
^
a
^
xx
4
'
,
8
o
°
o
o
13
14
13
Note
use
50
Hz
and
100
Hz
sources
if
relay
has
a
50
Hz
nameplate
rating
.
Apply
dc
control
power
per
relay
’
s
nameplate
rating
.
Resistor
required
between
terminals
9
and
10
.
page
14
.
See
TEST SET
Contact
Monitor
a
a
-
CD
-
Current Source
*
t
60
HZ
Phase
-
o
deg
Q
-
+
a
Current
Source
#
2
120
HZ
Phase
-
0
deg
a
Figure
11
:
Typical
Test
Connections
Harmonic Restraint
Test
using
Electronic
Current
Source
.
(
+
)
87
T
J
(
-
)
o
7
6
<
5
^
6
8
o
°
o o
13
14
13
U
12
11
lO
9
Courtesy of NationalSwitchgear.com