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Bushing Current Transformers Bushing Current Transformers 600V Class 600V Class Bushing Current Transformers
Bushing Current Transformers
600V Class
600V Class Bushing-Type Current Transformers
(BCT)
Instrument Transformers, Inc.
is a recognized world leader in the design and manufacture of
Instrument transformers. As part of ITIs product scope, the company
produces a diversified range of bushing current transformers. BCT which
are installed on 600 Volt, and higher electrical systems.
Type B07- Current Transformers are for use over outdoor bushings of
Power Transformers, Bulk Oil Circuit Breakers and other Dead - Tank
Circuit Breakers.
The B07 bushing type mounts externally over the apparatus bushing on
the cover of the apparatus. These transformers are used primarily for
relaying but may also be used for metering where rating allows.
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1 www.GEMultilin.com
Features

Conforms to IEEE Std.,
C57.13 or IEC, 60044-1.
Consult factory for other
standards Weather proof outdoor
terminal box of heavy,
molded, weatherproof,
polyester resin,
glass-reinforced Conduit connections - Two
1 threaded hubs for
horizontal take-off and a 1
IPS knockout in the
bottom

Stainless steel or
aluminum, nameplate

Broad range of sizes
and ratios
2

Weather resistant

High mechanical impact
and dielectric strength Completely encapsulated
in polyurethane

Easy installed Clearly identified
secondary terminals Mounting feet can be located anywhere
around the inner or outer periphery In an installation where it is not
desirable for the relay to see a
bushing flash-over, the mounting
clamps should be placed around
the outer periphery of the
transformer. The ground
conductor should not pass
through the window.
In an installation where it is
desirable for the relay to see
the bushing flash-over current,
the mounting clamps should be
positioned around the inner
periphery and the ground
conductors should pass through
the window. The inside diameter
of the current transformer should
be increased by 4 to
accommodate this arrangement.
Mounting Clamps
The mounting clamps are of
aluminum and held together with
the 1/2 stainless steel studs
(continuously threaded) and the
stainless steel nuts, that make it
very easy to install. Mounting
clamps also support optional
ground shield.
Clamps can be placed at any
convenient location around the
inner or outer periphery of the
transformer. Three complete sets
are included with each trans-
former.
Construction
The toroidal cores are made of
cold-rolled, high-permeability,
grain-oriented, silicon steel,
annealed after forming under
precisely controlled conditions.
The grain of the core steel is
oriented in the direction of the
magnetic flux, thus minimizing
the core losses and maximizing
the accuracy..
Windings
The winding are wound over
the insulated core on large
toroidal winding machines.
They are fully distributed around
the core on all taps so that the
leakage reactance is low on
each tap.
Encapsulation
The core and coils are
encapsulated in polyurethane.
The system used is a proprietary
formulation. It was developed
specifically to meet the rigorous
electrical, physical and chemical
requirements of outdoor,
electrical insulation.
This encapsulation system
demonstrates excellent weather
resistance.
The U.V.-stabilized insulation has
adequate elasticity to
compensate for dimensional
changes of the core, caused by
temperature variations, without
cracking or crazing.
Secondary Terminals and
Conduit Box
The secondary terminals are #10-
32 screws in tappedbosses. The
terminals are housed in a
polyester terminal box of sturdy
construction with a neoprene
gasket and polyester cover.
The box is fitted with two 1 IPS
threaded openings for horizontal
conduit takeoff and and one
knockout in the bottom for 1 IPS
conduit, the flange for the cover
is at 45 degree angle which gives
maximum accessibility for wiring
and connecting.
Ground Shield
Ground shields are available.
The installation of the current
transformer reduces the
line-to-ground strike distance of
the apparatus on which it is
mounted, a ground shield should
be used.
The ground shields are
fabricated of aluminum and fit
closely over the top of the
current transformer.
The shield purpose is to prevent
a bushing flash-over from
penetrating the insulation and
impressing a high voltage upon
the secondary winding,
interconnecting cables, and
relays.
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Type BO7
Current Transformer
Standard Selection
Catalog
Number
Ratio
Relaying
Accuracy
DIM
A**
DIM
B**
DIM
C**
MAX.
Approx.
Weight
B0760112
600:5MR
C400
12.00
24.75
4.50
245 lbs.
B0760118
600:5MR
C400
18.00
31.00
4.50
340 lbs.
B0760120
600:5MR
C400
20.00
33.00
4.25
355 lbs.
B0760122
600:5MR
C400
22.00
35.00
4.25
385lbs.
B0760126
600:5MR
C400
26.00
39.00
4.25
425 lbs.
B0760128
600:5MR
C400
28.00
40.75
4.25
450 lbs.
B0760132
600:5MR
C400
32.00
43.50
5.00
475 lbs.
B0712212
1200:5MR
C800
12.00
24.75
4.50
233 lbs.
B0712218
1200:5MR
C800
18.00
30.75
4.50
307 lbs.
B0712220
1200:5MR
C800
20.00
32.75
4.50
331 lbs.
B0712222
1200:5MR
C800
22.00
34.75
4.50
356 lbs.
B0712226
1200:5MR
C800
26.00
38.75
4.50
406 lbs.
B0712228
1200:5MR
C800
28.00
40.75
4.50
429 lbs.
B0712232
1200:5MR
C800
32.00
43.50
4.75
460 lbs.
B0720212
2000:5MR
C800
12.00
24.75
3.75
200 lbs.
B0720218
2000:5MR
C800
18.00
30.75
3.75
240 lbs.
B0720220
2000:5MR
C800
20.00
32.75
3.75
255 lbs.
B0720222
2000:5MR
C800
22.00
31.00
3.75
275 lbs.
B0720226
2000:5MR
C800
26.00
38.75
3.75
315 lbs.
B0720228
2000:5MR
C800
28.00
40.75
3.75
325 lbs.
B0720232
2000:5MR
C800
32.00
43.50
3.75
355 lbs.
B0730212
3000:5MR
C800
12.00
24.75
3.75
144 lbs.
B0730218
3000:5MR
C800
18.00
30.75
3.75
189 lbs.
B0730220
3000:5MR
C800
20.00
32.75
3.75
202 lbs.
B0730222
3000:5MR
C800
22.00
34.75
3.75
215 lbs.
B0730226
3000:5MR
C800
26.00
38.75
3.75
243 lbs.
B0730228
3000:5MR
C800
28.00
40.75
3.75
257 lbs.
B0730232
3000:5MR
C800
32.00
43.50
3.75
268 lbs.
4
* CONSULT FACTORY FOR OTHER SIZES & RATINGS
STANDARD CURRENT TRANSFORMERS SELECTION GUIDE*
** ALL DIMENSIONS ARE + 0.25 TOLERANCE. www.GEMultilin.com
Type BO7
Ground Shield
Standard Selection
Part Number
Model Number
Approx.
Weight
DIM
A
DIM
B
DIM
C
1221B2739610
B07GS1225
7.5 lbs.
12.00
25.19
26.94
1221B2739611
B07GS1831
10 lbs.
18.00
31.19
32.94
1221B2739612
B07GS2033
11 lbs.
20.00
33.19
34.94
1221B2739613
B07GS2235
11.5 lbs.
22.00
35.19
36.94
1221B2739614
B07GS2639
13 lbs.
26.00
39.19
40.94
1221B2739615
B07GS2841
14 lbs.
28.00
41.19
42.94
1221B2739616
B07GS3244
14 lbs.
32.00
43.19
45.69
Available
Ratios
Connections
Available
Ratios Connections Available
Ratios
Connections
Available
Ratios
Connections
600:5
X1-X5
1200:5
X1-X5
3000:5
X1-X5
500:5
X2-X5
1000:5
X2-X5
2000:5
X1-X5
2500:5
X2-X5
450:5
X3-X5
900:5
X3-X5
1600:5
X2-X5
2200:5
X3-X5
400:5
X1-X4
800:5
X1-X4
1500:5
X1-X4
2000:5
X1-X4
300:5
X2-X4
600:5
X2-X4
1200:5
X1-X3
1500:5
X2-X4
250:5
X3-X4
500:5
X3-X4
1100:5
X2-X4
1200:5
X3-X4
200:5
X4-X5
400:5
X4-X5
800:5
X2-X3
1000:5
X4-X5
150:5
X1-X3
300:5
X1-X3
400:5
X4-X5
800:5
X1-X3
100:5
X1-X2
200:5
X1-X2
500:5
X1-X2
500:5
X1-X2
50:5
X1-X3
100:5
X1-X3
300:5
X3-X4
300:5
X1-X3
5
Nominal Ratio - 2000:5
Nominal Ratio - 600:5
Nominal Ratio - 1200:5
Nominal Ratio - 3000:5
* NON-STANDARD ANSI TAPS ARE ALSO AVAILABLE
TYPE B07 STANDARD MULTI RATIO TAPS * Quoting and ordering
information
1) Minimum Inside Diameter
2) Maximum Outside Diameter
3) Maximum Height allowed
4) Specify Ratio
(Single, Dual or Multi-ratio)
5) Accuracy Requirements
6) Burden Requirements
7) Rating Factor
8) Any other mechanical or
environmental limitations
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Bushing Type CT,
600 V Class,
10kV BIL, 60 Hz
6
Other Cast Resin BCTS
Outdoor
600 V Class, 10 kV BIL, 60 Hz
Features

Flexibility of customer specified
size and accuracy rating allows
for custom-fit with this
economicaldesign Ratios may be supplied as
single-ratios , dual-ratio,
or multi-ratios per standard
IEEE taps. Non-standard
taps also available Optional aluminum ground
shield design to provide
bushing flashover protection Permanent stainless steel or
aluminum nameplate, with
pertinent information, mounted
on the transformer Conforms to IEEE Standard
C57.13 Typical excitation data
available upon request Three-point mounting bracket
arrangement s