Howard Industries Catolog Section Molded High-Voltage 66...
4
Bushing Wells 66-10 Catolog Section 1 INTRODUCTION Howard Industries molded high- voltage bushing wells are designed for use on fluid-filled pad-mounted distribution transformers, where bush- ings 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 attach- ment and allow interchangeability with similarly designed bushings used on many types of pad-mounted trans- formers. The removable stud is easily removed with a standard 5/32” hex head Allen wrench. The design incorporates several fea- tures 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 compres- sion, while preventing over compres- sion. An internal gasket seal between the molded-in copper stud and plastic prevents fluid leaks. Both seals are manufactured from a proprietary com- Howard Industries Components Division Molded High-Voltage Document: 2.4.84 Revision: 0 Issued: January 2008 Copyright © 2008 Howard Industries, Inc. pound specifically designed for use in the transformer environment. Thermoplastic high-temperature nylon was chosen as the insulating plastic because of its exceptional mechani- cal and electrical stability over a wide range of temperature, humidity, and environmental extremes. It also ex- hibits good flexibility allowing confor- mance to the tank wall during internal pressure changes. Figure 1 - Round Bushing Well Figure 2 - Tri-Clamp Bushing Well (shown with optional bail tabs)
Transcript of Howard Industries Catolog Section Molded High-Voltage 66...
Bushing Wells66-10Catolog Section
1
INTRODUCTIONHoward Industries molded high-voltage bushing wells are designed for use on fl uid-fi lled pad-mounted distribution transformers, where bush-ings are mounted indoors or inside a terminal enclosure. Materials used in the design are compatible with commonly used transformer fl uids, 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 fi xed (non-removable) and removable stud versions. All bushing wells are designed for external attach-ment and allow interchangeability with similarly designed bushings used on many types of pad-mounted trans-formers. The removable stud is easily removed with a standard 5/32” hex head Allen wrench.
The design incorporates several fea-tures to ease installation and prevent fl uid 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 compres-sion, while preventing over compres-sion. An internal gasket seal between the molded-in copper stud and plastic prevents fl uid leaks. Both seals are manufactured from a proprietary com-
Howard IndustriesComponents Division Molded High-Voltage
Document: 2.4.84Revision: 0Issued: January 2008
Copyright © 2008 Howard Industries, Inc.
pound specifi cally designed for use in the transformer environment.
Thermoplastic high-temperature nylon was chosen as the insulating plastic because of its exceptional mechani-cal and electrical stability over a wide
range of temperature, humidity, and environmental extremes. It also ex-hibits good fl exibility allowing confor-mance to the tank wall during internal pressure changes.
Figure 1 - Round Bushing Well
Figure 2 - Tri-Clamp Bushing Well (shown with optional bail tabs)
Molded High-Voltage Bushing Wells
2
66-10
Copyright © 2008 Howard Industries, Inc. Document: 2.4.84Revision: 0Issued: January 2008
0066-100272-400
60°60°
120°
BOLT CIRCLE
Ø2.625
4.60
0.63
1.00
Ø2.50
FLAT BLACKCONDUCTIVE COATING
A
A
SECTION A-A
Ø0.375STUD MAX.
RATINGS:(IN ACCORDANCE WITH IEEE STANDARD 386-1995)
VOLTAGE CLASS..........................................35KVMAXIMUM LINE GROUND.......................21.1 KVAC 60 HZ/MIN..............................................50 KVDC 15 MIN. ...................................................103 KVIMPULSE B.I.L. ..............................................150 KVMINIMUM CORONA LEVEL......................26 KVCONTINUOUS CURRENT...........................200 AMPS
NOTE:1) TORQUE MOUNTING NUTS TO 50-80 IN./LB.2) USE WITH HI GASKET 0061-003259-102
TYPICAL MOUNTING HOLE DETAIL
MATERIAL:THERMOPLASTIC NYLON
3/8"-16 UNC-2A
(STUDS CAN BE ROTATED IN ANY DIRECTION)
THE DIMENSIONS OF THE BUSHING WELL ALLOWINTERCHANGABILITY WITH OTHER PRODUCTS,CONFORMING WITH THE 200 AMP SPECIFICATIONSFOUND IN IEEE STANDARD 386-1995.
50
00
4-
1
27
20
01
4-
60
0
PMA 002G- L
VK
1.21
XAM
0
Ø3.64
COPPERINSERT
COLOR: BLACK
54 3
21
4.754.35Ø
Figure 3 - Round Fixed Stud HV Bushing Well
Figure 4 - Round Removable Stud HV Bushing Well
4.60
0.63
1.00
Ø2.50
FLAT BLACKCONDUCTIVE COATING
A
A
SECTION A-A
3/8"-16 UNC-2A
50
00
4-
1
27
20
01
4-
60
0
PMA 002G- L
VK
1.21
XAM
0
Ø3.64
COPPERINSERT
54 3
21
RATINGS:(IN ACCORDANCE WITH IEEE STANDARD 386-1995)
VOLTAGE CLASS..........................................35KVMAXIMUM LINE GROUND.......................21.1 KVAC 60 HZ/MIN..............................................50 KVDC 15 MIN. ...................................................103 KVIMPULSE B.I.L. ..............................................150 KVMINIMUM CORONA LEVEL......................26 KVCONTINUOUS CURRENT...........................200 AMPS
NOTE:1) TORQUE MOUNTING NUTS TO 50-80 IN./LB.2) USE WITH HI GASKET 0061-003259-102
MATERIAL:THERMOPLASTIC NYLON
THE DIMENSIONS OF THE BUSHING WELL ALLOWINTERCHANGABILITY WITH OTHER PRODUCTS,CONFORMING WITH THE 200 AMP SPECIFICATIONSFOUND IN IEEE STANDARD 386-1995.
3) ON REMOVABLE STUD, USE HI PART 0061-100272-406
COLOR: BLACK
4) REMOVABLE STUD MUST BE TORQUED TO 200 IN.-LBS. MIN.
0066-100272-451
60°60°
120°
BOLT CIRCLE
Ø2.625
Ø0.375STUD MAX.
TYPICAL MOUNTING HOLE DETAIL(STUDS CAN BE ROTATED IN ANY DIRECTION)
4.754.35Ø
66-10
3
Molded High-Voltage Bushing Wells
Copyright © 2008 Howard Industries, Inc.Document: 2.4.84Revision: 0Issued: January 2008
Figure 5 - Tri-Clamp Fixed Stud HV Bushing Well
Figure 6 - Tri-Clamp Removable Stud HV Bushing Well
SECTION A-ARATINGS:(IN ACCORDANCE WITH IEEE STANDARD 386-1995)
VOLTAGE CLASS.........................................35KVMAXIMUM LINE GROUND.......................21.1 KVAC 60 HZ/MIN..............................................50 KVDC 15 MIN. ...................................................103 KVIMPULSE B.I.L. .............................................150 KVMINIMUM CORONA LEVEL......................26 KVCONTINUOUS CURRENT...........................200 AMPS
NOTE:1) TORQUE MOUNTING NUTS TO 50-80 IN./LB.2) USE WITH HI GASKET 0061-003259-102
MATERIAL:THERMOPLASTIC NYLON
THE DIMENSIONS OF THE BUSHING WELL ALLOWINTERCHANGABILITY WITH OTHER PRODUCTS,CONFORMING WITH THE 200 AMP SPECIFICATIONSFOUND IN IEEE STANDARD 386-1995.
A
A
4.60
1.00
Ø2.50
0.70
FLAT BLACKCONDUCTIVE COATING
3/8"-16 UNC-2A
COPPERSTUD
COLOR: BLACK
PMA 002G- L
VK
1.12
XAM1
13
4-
27
20
01
-4
60
0
500
54 3
21
60°60°
120°
BOLT CIRCLE
Ø2.625
Ø0.375STUD MAX.
TYPICAL MOUNTING HOLE DETAIL(STUDS CAN BE ROTATED IN ANY DIRECTION)
Ø4.754.35
0066-100272-431
SECTION A-A
A
A
4.60
1.00
Ø2.50
0.70
FLAT BLACKCONDUCTIVE COATING
3/8"-16 UNC-2A
COPPERSTUD
PMA 002G- L
VK
1.12
XAM1
13
4-
27
20
01
-4
60
0
500
54 3
21
RATINGS:(IN ACCORDANCE WITH IEEE STANDARD 386-1995)
VOLTAGE CLASS..........................................35KVMAXIMUM LINE GROUND........................21.1 KVAC 60 HZ/MIN..............................................50 KVDC 15 MIN. ...................................................103 KVIMPULSE B.I.L. ..............................................150 KVMINIMUM CORONA LEVEL......................26 KVCONTINUOUS CURRENT...........................200 AMPS
NOTE:1) TORQUE MOUNTING NUTS TO 50-80 IN./LB.2) USE WITH HI GASKET 0061-003259-102
MATERIAL:THERMOPLASTIC NYLON
THE DIMENSIONS OF THE BUSHING WELL ALLOWINTERCHANGABILITY WITH OTHER PRODUCTS,CONFORMING WITH THE 200 AMP SPECIFICATIONSFOUND IN IEEE STANDARD 386-1995.
3) ON REMOVABLE STUD, USE HI PART 0061-100272-406
COLOR: BLACK
4) REMOVABLE STUD MUST BE TORQUED TO200 IN.-LBS. MIN.
0066-100272-461
60°60°
120°
BOLT CIRCLE
Ø2.625
Ø0.375STUD MAX.
TYPICAL MOUNTING HOLE DETAIL(STUDS CAN BE ROTATED IN ANY DIRECTION)
4.754.35Ø
Molded High Voltage Bushing Wells
Catalog Section 66-10Document 2.4.84, Revision 0, January 2008
Copyright © 2008 Howard Industries, Inc.Laurel, Mississippi
Telephone: 601-425-3151Fax: 601-649-8090
E-mail: [email protected]: www.howard.com
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. Removable-stud bushing wells are shipped with dust cap, gasket and removable stud.
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
