ABB Type O Plus CTM bushings are
available in ratings from 15 kV to 800 kV
ABB bushings use proven designs and manufacturing processes to meet
the exacting requirements of our ANSI and CSA customer base, which
includes electric utility, OEM, industrial, and construction companies.
We build and test our bushings in the most advanced facilities in the
industry. As a result, ABB bushings have power factor and partial
discharge levels below the latest ANSI and CSA standards. ABB is the
only bushing supplier to guarantee this level of performance for new,
replacement or rebuilt bushings.
Bushing Selections
ABB Uses the World's Most Advanced Bushing Technologies.
At ABB, we've combined the world's best bushing technologies to bring
our customers a superior condenser bushing design. A prime example of
our advanced technologies is the state-of-the-art fused-ink condenser
used in the ABB oil-impregnated condenser bushing. The ABB condenser is
manufactured using a proprietary process that fuses the semiconducting
ink into the fibers of special, low-density kraft paper. This process
eliminates the gaps at the ends of the condenser, between the conductive
and insulating layers that are present in surface-printed-ink or foil
capacitor designs.
Our fused-ink condenser technology yields the following benefits:
Low power factor. Stringent manufacturing procedures minimize moisture
content and contribute to the ABB power factor guarantees of less than
0.4 percent for ratings up to 230 kV and less than 0.35 percent for
ratings above 230 kV. The ANSI/IEEE standards allow a power factor of
0.55 percent for condenser-type bushings.
The lowest partial discharge levels in the industry. ABB guarantees less
than 5 picocoulombs or 5 microvolts of partial discharge for the Type O
Plus C condenser bushings, at test levels of 1.5 times the rated maximum
line-to-ground voltage. This is 50 percent of the value allowed by
current ANSI/IEEE bushing standards.
ABB Bushings Have the Lowest Power Factors and Partial Discharge
Guarantees in the Industry.
Superior designs for condensers and the mechanical shells give Type O
plus C bushings a clear edge in performance, quality and reliability
over other bushings. The specification and use of ABB, Type O Plus C
bushings provides you with the following advantages:
High Reliability: Type O Plus C bushings have power factor and
partial discharge levels that typically are less than half the limits
set by ANSI and IEEE.
Interchangeability: Type O Plus C bushings are interchangeable
with most bushings now in service on power transformers and on most oil
power circuit breakers. Interchangeability simplifies maintenance and
permits the reduction of spare parts inventory.
Rapid Availability: ABB maintains a large finished bushing
inventory as well as a large bushing part's inventory. These inventories
allow ABB to quickly provide a wide range of bushings to meet
just-in-time manufacturing schedules, and emergencies in the field.
Easy Maintenance: With a sight glass or prismatic lens for
periodic inspection of the oil level.
High Quality Product: The Type O Plus C bushings are built to the
highest standards of quality.
ABB Type O Plus C (tm) Draw-Rod
Bushings
General
The first draw-rod bushings were developed in 1995. The draw-rod
bushing features the current rating of a bottom connected bushing with
the ease of installation and replacement of a draw-lead bushing. The
draw-rod bushings were designed to meet applicable ANSI/IEEE standards
that will allow the user to decrease inventory since the draw rod
bushing can replace draw-lead and bottom connected bushings.
The largest benefits of the draw-rod bushing are:
During installation and commissioning of a new transformer the oil
will not have to be lowered and a person will not have to enter the
transformer to connect the bushings since the transformer lead is
already connected to the draw-rod
If bushings are ever replaced then the replacement bushing can be
installed without lowering the oil since the transformer lead is not
disconnected from the draw-rod.
Inventory will be controlled since the draw rod bushing replaces
bottom connected, draw-rod, and in some cases draw-lead bushings.
Ratings
The draw-rod Type O Plus C line of bushings are as follows:
Voltage Rating
(BIL)
Current Rating
25 kV
150 kV
2700 A
115 kV
550 kV
2000 A
138 kV
650 kV
2000 A
161 kV
750 kV
2000 A
196 kV
900 kV
2500 A
Testing
The Draw-Rod bushings have been tested to meet applicable ANSI/IEEE
standards.
Other Types of Bushings
Type T condenser bushings are available 25 kV and 34.5 kV voltage
classes. The Type T bushing is designed for use in high current
applications (up to 21,500 A.) These bushings are also available in high
temperature designs for use in bus duct applications. This family of
bushings has been designed to minimize space requirements and you will
find that they are more compact than other designs for similar
applications, and can be mounted on either the cover or sidewall. The
condensers which are used in the Type T bushing are of the same proven
construction, with low power factor and partial discharge levels, as
found in Type O Plus C bushings.
Solid or bulk type bushings are designated as Types A, RJ
and LCRJ. These bushings are installed easily on either covers or
sidewalls, and are available for special applications such as in high
temperature enclosed bus and up to 23,000A current ratings. LCRJ designs
combine the low partial discharge of a condenser bushing and the
durability of a bulk bushing.
For further information please contact:
ABB Inc.
1128 S. Cavalier Drive
Alamo, TN 38001
Voice: 800-955-8399
Fax: 731-696-5269
E-mail: Customer Service
Bushing Selections
