Catolog Section
Howard Industries
Components Division
Molded High-Voltage
Bushing Wells
66-10
INTRODUCTION
Howard Industries molded highvoltage bushing wells are designed
for use on fluid-filled pad-mounted
distribution transformers, where bushings are mounted indoors or inside
a terminal enclosure. Materials used
in the design are compatible with
commonly used transformer fluids,
including mineral oil, R-Temp, silicone
oil, and seed-based oils. They were
designed to meet the requirements of
IEEE Std 385-1995 and will interface
with all commonly used inserts built in
compliance with this standard.
Four versions have been designed
and tested, all accomodating the
industry standard 3/8-16 threaded
stud. These four versions include a
standard round bushing well that
requires an external metal clamp and
a triangular-shaped version that has
a molded-in clamp. Both of these are
available in fixed (non-removable) and
removable stud versions. All bushing
wells are designed for external attachment and allow interchangeability with
similarly designed bushings used on
many types of pad-mounted transformers. The removable stud is easily
removed with a standard 5/32” hex
head Allen wrench.
The design incorporates several features to ease installation and prevent
fluid leaks at the tank interface and
along the plastic-to-copper insert
molded into the wells. The tank wall
gasket system features a piloted
design to prevent misalignment during
installation and a positive stop that
provides consistent gasket compression, while preventing over compression. An internal gasket seal between
the molded-in copper stud and plastic
prevents fluid leaks. Both seals are
manufactured from a proprietary comDocument: 2.4.84
Revision: 0
Issued: January 2008
Figure 1 - Round Bushing Well
Figure 2 - Tri-Clamp Bushing Well (shown with optional bail tabs)
pound specifically designed for use in
the transformer environment.
Thermoplastic high-temperature nylon
was chosen as the insulating plastic
because of its exceptional mechanical and electrical stability over a wide
Copyright © 2008 Howard Industries, Inc.
range of temperature, humidity, and
environmental extremes. It also exhibits good flexibility allowing conformance to the tank wall during internal
pressure changes.
1
66-10
Molded High-Voltage Bushing Wells
0066-100272-400
A
FLAT BLACK
CONDUCTIVE COATING
3/8"-16 UNC-2A
Ø3.64
0
4 5
1 2
05
3
0
-G
0
L
64
21 . 1 K V
272- 4
1 00
00
1
X
MA
2 0 0 AMP
Ø0.375
STUD MAX.
60°
1.00
A
4.75
Ø 4.35
60°
Ø2.50
COPPER
INSERT
0.63
4.60
BOLT CIRCLE
SECTION A-A
RATINGS:
NOTE:
(IN ACCORDANCE WITH IEEE STANDARD 386-1995)
1) TORQUE MOUNTING NUTS TO 50-80 IN./LB.
2) USE WITH HI GASKET 0061-003259-102
VOLTAGE CLASS..........................................35KV
MAXIMUM LINE GROUND.......................21.1 KV
AC 60 HZ/MIN..............................................50 KV
DC 15 MIN. ...................................................103 KV
IMPULSE B.I.L. ..............................................150 KV
MINIMUM CORONA LEVEL......................26 KV
CONTINUOUS CURRENT...........................200 AMPS
120°
MATERIAL:
THERMOPLASTIC NYLON
COLOR: BLACK
THE DIMENSIONS OF THE BUSHING WELL ALLOW
INTERCHANGABILITY WITH OTHER PRODUCTS,
CONFORMING WITH THE 200 AMP SPECIFICATIONS
FOUND IN IEEE STANDARD 386-1995.
Ø2.625
TYPICAL MOUNTING HOLE DETAIL
(STUDS CAN BE ROTATED IN ANY DIRECTION)
Figure 3 - Round Fixed Stud HV Bushing Well
0066-100272-451
A
FLAT BLACK
CONDUCTIVE COATING
3/8"-16 UNC-2A
Ø3.64
0
4 5
1 2
05
3
0
0
-G
2 0 0 AMP
60°
1.00
A
4.75
Ø 4.35
60°
L
64
21 . 1 K V
272- 4
1 00
00
1
X
MA
Ø0.375
STUD MAX.
Ø2.50
COPPER
INSERT
0.63
4.60
BOLT CIRCLE
SECTION A-A
RATINGS:
(IN ACCORDANCE WITH IEEE STANDARD 386-1995)
VOLTAGE CLASS..........................................35KV
MAXIMUM LINE GROUND.......................21.1 KV
AC 60 HZ/MIN..............................................50 KV
DC 15 MIN. ...................................................103 KV
IMPULSE B.I.L. ..............................................150 KV
MINIMUM CORONA LEVEL......................26 KV
CONTINUOUS CURRENT...........................200 AMPS
120°
Ø2.625
TYPICAL MOUNTING HOLE DETAIL
(STUDS CAN BE ROTATED IN ANY DIRECTION)
THE DIMENSIONS OF THE BUSHING WELL ALLOW
INTERCHANGABILITY WITH OTHER PRODUCTS,
CONFORMING WITH THE 200 AMP SPECIFICATIONS
FOUND IN IEEE STANDARD 386-1995.
NOTE:
1) TORQUE MOUNTING NUTS TO 50-80 IN./LB.
2) USE WITH HI GASKET 0061-003259-102
3) ON REMOVABLE STUD, USE HI PART 0061-100272-406
4) REMOVABLE STUD MUST BE TORQUED TO
200 IN.-LBS. MIN.
MATERIAL:
THERMOPLASTIC NYLON
COLOR: BLACK
Figure 4 - Round Removable Stud HV Bushing Well
2
Copyright © 2008 Howard Industries, Inc.
Document: 2.4.84
Revision: 0
Issued: January 2008
66-10
Molded High-Voltage Bushing Wells
0066-100272-431
FLAT BLACK
CONDUCTIVE COATING
A
3/8"-16 UNC-2A
0
4 5
1 2
05
3
0
-G
0
L
64
21 . 1 K V
272- 4
1 00
31
1
X
MA
2 0 0 AMP
Ø0.375
STUD MAX.
Ø2.50
A
1.00
COPPER
STUD
4.75
Ø 4.35
60°
60°
BOLT CIRCLE
0.70
4.60
SECTION A-A
RATINGS:
NOTE:
(IN ACCORDANCE WITH IEEE STANDARD 386-1995)
1) TORQUE MOUNTING NUTS TO 50-80 IN./LB.
2) USE WITH HI GASKET 0061-003259-102
VOLTAGE CLASS.........................................35KV
MAXIMUM LINE GROUND.......................21.1 KV
AC 60 HZ/MIN..............................................50 KV
DC 15 MIN. ...................................................103 KV
IMPULSE B.I.L. .............................................150 KV
MINIMUM CORONA LEVEL......................26 KV
CONTINUOUS CURRENT...........................200 AMPS
120°
MATERIAL:
THERMOPLASTIC NYLON
COLOR: BLACK
THE DIMENSIONS OF THE BUSHING WELL ALLOW
INTERCHANGABILITY WITH OTHER PRODUCTS,
CONFORMING WITH THE 200 AMP SPECIFICATIONS
FOUND IN IEEE STANDARD 386-1995.
Ø2.625
TYPICAL MOUNTING HOLE DETAIL
(STUDS CAN BE ROTATED IN ANY DIRECTION)
Figure 5 - Tri-Clamp Fixed Stud HV Bushing Well
0066-100272-461
FLAT BLACK
CONDUCTIVE COATING
A
3/8"-16 UNC-2A
0
4 5
1 2
05
3
0
-G
0
L
64
21 . 1 K V
272- 4
1 00
31
1
X
MA
2 0 0 AMP
Ø0.375
STUD MAX.
Ø2.50
A
1.00
COPPER
STUD
4.75
Ø 4.35
60°
60°
BOLT CIRCLE
0.70
4.60
SECTION A-A
RATINGS:
120°
Ø2.625
TYPICAL MOUNTING HOLE DETAIL
(STUDS CAN BE ROTATED IN ANY DIRECTION)
(IN ACCORDANCE WITH IEEE STANDARD 386-1995)
NOTE:
VOLTAGE CLASS..........................................35KV
MAXIMUM LINE GROUND........................21.1 KV
AC 60 HZ/MIN..............................................50 KV
DC 15 MIN. ...................................................103 KV
IMPULSE B.I.L. ..............................................150 KV
MINIMUM CORONA LEVEL......................26 KV
CONTINUOUS CURRENT...........................200 AMPS
1) TORQUE MOUNTING NUTS TO 50-80 IN./LB.
2) USE WITH HI GASKET 0061-003259-102
3) ON REMOVABLE STUD, USE HI PART 0061-100272-406
4) REMOVABLE STUD MUST BE TORQUED TO
200 IN.-LBS. MIN.
THE DIMENSIONS OF THE BUSHING WELL ALLOW
INTERCHANGABILITY WITH OTHER PRODUCTS,
CONFORMING WITH THE 200 AMP SPECIFICATIONS
FOUND IN IEEE STANDARD 386-1995.
MATERIAL:
THERMOPLASTIC NYLON
COLOR: BLACK
Figure 6 - Tri-Clamp Removable Stud HV Bushing Well
Document: 2.4.84
Revision: 0
Issued: January 2008
Copyright © 2008 Howard Industries, Inc.
3
Description
Rating
Voltage class
35 kV
Basic impulse level
150 kV
60 Hz one minute withstand voltage
50 kV
Maximum current
200 A
Table 1 - Electrical Characteristics
Description
Part Number
Figure
Round bushing well with fixed stud
0066-100272-400
3
Round bushing well with removable stud
0066-100272-451
4
Tri-clamp bushing well with fixed stud
0066-100272-431
5
Tri-clamp bushing well with removable stud
0066-100272-461
6
Nitrile gasket (included with bushing well)
0061-003259-102
Removable stud (included with removable-stud bushing wells)
0061-100272-406
Metal clamp for round bushing wells, zinc plated carbon steel
0061-002678-004
Metal clamp for round bushing wells, stainless steel
0061-002678-005
Stainless steel bail tab wire for tri-clamp bushing wells
0061-001598-002
Dust cap (included with bushing well)
0061-002174-709
Table 2 - Bushing Wells, Gaskets and Accessories
Note: Fixed-stud bushing wells are shipped with dust cap and gasket. Removablestud bushing wells are shipped with dust cap, gasket and removable stud.
Molded High Voltage Bushing Wells
Catalog Section 66-10
Document 2.4.84, Revision 0, January 2008
Copyright © 2008 Howard Industries, Inc.
Laurel, Mississippi
Telephone: 601-425-3151
Fax: 601-649-8090
E-mail: marketing@howard.com
Web: www.howard.com