ABB CIRCUIT SHIELD 87T - Page 7

Transformer
Differential
Relay
IB
7.6
.
1.7
-
4
Page
7
Type
87
T
Tap
Ratios
TABLE
1
3.2
4.0
2.9
3.6
4.5
5.0
8.7
2.9
1.0 0
1.10
1.24
1.38
1
.
72
3.00
1
.
55
3.2
1
.
00
1
.
25
1.13
1
.
41
1.56
2.72
3.6
1
.
00
1 . 1 1
1.39
2.42
1
.
25
4.0
1.0 0
1.13
1.25
2.18
4.5
1.0 0
1 . 1 1
1.93
5.0
1
.
00
1.74
8.7
1.00
Continuous
Current
Ratings
TABLE
2
TABLE
3
Burden
Data
Tap
Setting
Continuous
Rating
Tap
Setting
Ohms
P
.
F
.
2.9
A
3.2
A
3.6
A
4.0
A
4.5
A
5.0
A
8.7
A
1
0
A
2.9
A
3.2
A
3.6
A
4.0
A
4.5
A
5.0
A
8.7
A
0.05
0.05
0.04
0.04
0.04
0.04
0.04
1 . 0
10
A
1 . 0
10
A
1 . 0
1
OA
1
.
0
1
OA
1 . 0
1
OA
1
.
0
17
A
1 . 0
Figure
2
:
Internal
Connection
Diagrams
16
D
419
B
Transformer
Differential
Relay
Drawout
Test
Case
Type
87
T
Type
87
T
Transformer
Differential
Relay
Standard
Case
16
D
219
B
+
+
1
06
O
5
o
3
02
ol
fccJ
fee
?
1
5
a
I
T
T
T
T
G
JT
°
G
r
°
i
i
i
i
$
1
E
$
15
OlH
Oja
$
12
$
11
10
?
q
ID
9
*
Notes
:
1
.
Omit
coil
3
-
4
for
two
winding
relays
.
2
.
The
tap
block
associated
with
coil
1
-
2
is
on
left
hand
side
,
when
viewed
from
the
front
of
the
relay
.
3
.
The
tap
block
for
coil
5
-
6
is
on
the
right
hand
side
.
4
.
If
provided
,
the
tap
block
for
coil
3
-
4
is
in
the
center
.
5
.
The
external
resistor
shown
connected
between
terminals
9
and
10
is
supplied
mounted
on
the
relay
and
must
be
in
place
for
proper
operation
.
6
.
The
diode
shown
between
terminals
15
and
16
is
used
for
testing
only
.
See
test
procedures
.
Courtesy of NationalSwitchgear.com