Condenser, Type O Plus CTM

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

Now Available for Sale


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.


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


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