phase and single phase oil filled outdoor type Distribution transformers. SELF PROTECTED) DISTRIBUTION TRANSFORMERS OF 11 kV/ – V and CG Power Systems distribution transformers are manufactured in Mechelen Low voltage windings of distribution transformers are usually made of copper. Distribution transformers are normally considered to be those transformers which distribution transformer low-voltage windings and systems, these will be.
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ABB's liquid filled Power Distribution Transformers range from 16 kVA upwards, ABB supplies the widest range of power distribution transformers, including. Transformers classifications: 1. By field of usage: ❑ Power transformer for transmission network. ❑ Distribution transformer for distribution networks. ❑ Power. , and kVA for 11 kV distribution transformers and , , , , , ,. , . former%20upto%%20kV-CM%ronaldweinland.info
Use[ edit ] Distribution transformers are normally located at a service drop , where wires run from a utility pole or underground power lines to a customer's premises. They are often used for the power supply of facilities outside settlements, such as isolated houses, farmyards or pumping stations at voltages below 30 kV. Another application is the power supply of the overhead wire of railways electrified with AC. In this case single phase distribution transformers are used. Several homes may be fed off a single transformer in urban areas; rural distribution may require one transformer per customer. A large commercial or industrial complex will have multiple distribution transformers. In urban areas and neighborhoods where the primary distribution lines run underground, padmount transformers , transformers in locked metal enclosures mounted on a concreted pad, are used.
A single phase delta transformer has two bushings on top which are connected to two of the three primary wires, so the voltage across the primary winding is the phase-to-phase voltage.
A disadvantage of a delta transformer is if only one of the two primary phases is deenergized, the remaining phase will backfeed through the transformer winding into the deenergized phase, which could be a hazard to line workers. Transformers providing three-phase secondary power, which are used for residential service in the European system, have three primary windings and are attached to all three primary phase wires.
The windings are almost always connected in a 'wye' configuration, with the ends of the three windings connected and grounded. The transformer is always connected to the primary distribution lines through protective fuses and disconnect switches. For pole-mounted transformers this usually takes the form of a ' fused cutout '.
An electrical fault causes the fuse to melt, and the device drops open to give a visual indication of trouble. It can also be manually opened while the line is energized by lineworkers using insulated hot sticks. In some cases completely self protected transformers are used, which have a circuit breaker built in, so a fused cutout isn't needed.
Secondary[ edit ] The low voltage secondary windings are attached to three or four terminals on the transformer's side. The V secondary winding is center-tapped and the center neutral wire is grounded, making the two end conductors "hot" with respect to the center tap. These three wires run down the service drop to the electric meter and service panel inside the building. Connecting a load between either hot wire and the neutral gives volts.
Connecting between both hot wires gives volts. There are three V secondary windings, each receiving power from a primary winding attached to one of the primary phases. One end of each secondary winding is connected to a 'neutral' wire, which is grounded. The other end of the 3 secondary windings, along with the neutral, are brought down the service drop to the service panel. Higher secondary voltages, such as volts, are sometimes required for commercial and industrial uses.
Some industrial customers require three-phase power at secondary voltages. Distribution transformers are also found in the power collector networks of wind farms , where they step up power from each wind turbine to connect to a substation that may be several miles kilometres distant. Both pole-mount and pad-mount transformers convert the high 'primary' voltage of the overhead or underground distribution lines to the lower 'secondary' voltage of the distribution wires inside the building.
The primaries use the three-phase system. Main distribution lines always have three wires, while smaller "laterals" close to the customer may include one or two phases, used to serve all customers with single-phase power. If three-phase service is desired, one must have a three-phase supply.
The high voltage primary windings are brought out to bushings on the top of the case. The transformer is always connected to the primary distribution lines through protective fuses and disconnect switches. For pole-mounted transformers this usually takes the form of a ' fused cutout '. An electrical fault causes the fuse to melt, and the device drops open to give a visual indication of trouble. It can also be manually opened while the line is energized by lineworkers using insulated hot sticks.
In some cases completely self protected transformers are used, which have a circuit breaker built in, so a fused cutout isn't needed. The low voltage secondary windings are attached to three or four terminals on the transformer's side.
Higher secondary voltages, such as volts, are sometimes required for commercial and industrial uses.
Some industrial customers require three-phase power at secondary voltages. To provide this, three-phase transformers can be used. In the US, which uses mostly single phase transformers, three identical single phase transformers are often wired in a transformer bank in either a wye or delta connection, to create a three phase transformer.
Distribution transformers are made using a core made from laminations of sheet steel stacked and either glued together with resin or banded together with steel straps. Where large numbers of transformers are made to standard designs, a wound C-shaped core is economic to manufacture. A steel strip is wrapped around a former, pressed into shape and then cut into two C-shaped halves, which are re-assembled on the copper windings.
The primary coils are wound from enamel coated copper or aluminum wire and the high current, low voltage secondaries are wound using a thick ribbon of aluminum or copper. The windings are insulated with resin-impregnated paper.
ABB offers a complete range of distribution transformers designed to grant the reliability, durability, and efficiency required in utility, industrial, and commercial applications. ABB's liquid-filled transformers are manufactured in accordance with the most demanding industry and international standards.
Transformers can be used for indoor or outdoor applications and can be provided with off-load and on-load tap changers. Submit your inquiry and we will contact you.
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