12,5MVA and 72,5kV and above, oil-immersed transformers are described as Power Transformers. Power transformers require distinct expertise and experience in particularly insulation and cooling issues. AA GROUP is capable of Supplying, and testing power transformers up to 1000MVA, 750KV with its and international experience. Although they essentially have a similar structure, particularly the differences in customer requirements and specifications call for new design for each transformer. Therefore, AA GROUP Electrical and Mechanical groups handle each transformer separately. AA GROUP Supplying power transformers that meet every requirement in every power and voltage range above 12,5MVA.
Main transformers located in transmission and distribution grids. Transformers used in industrial plants, production centers and service supply are also under this group. Power transformers, designed in consideration of international standards and customer specifications, incorporate the widest range in terms of power, voltage and regulation characteristics even though that are similar in principle.
> Production capacity of up to 1000MVA / 750kV,
> The most widely used transformers,
Distribution transformers are used in urban distribution systems, buildings and industrial plants. AA GROUP Supplying distribution transformers for all kinds of needs. Supplying of all kinds of oil-immersed distribution transformers below 12,5MVA and 72,5kV are made by AA GROUP team according to the principles of maximum efficiency, compactness, and endurance in compliance with customer demands.
AA GROUP is capable of Supplying cast resin dry type transformers with below given technical characteristics according to customer requirements.
Insulation Material Temperature Classes: F (155°C) and H (180°C)
Low Voltage Winding Technology: Pre-impregnated with heat-activated epoxy resin
Casted with epoxy resin under vacuum
High Voltage Winding Technology: Casted with quartz filled epoxy resin under vacuum
Casted with glass-fibre reinforced epoxy resin under vacuum
Advantages of cast resin dry type transformers:
- High overload capability
- Excellent endurance to short circuits and seismic conditions
- Flexibility during engineering to fulfill customer’s expectations
- Installation at harsh environmental conditions (very low ambient temperatures, high humidity) possible
- Long-time overload up to %40 with fan system.
AA GROUP Supplying standard distribution transformers with normal, low and very low losses from 160kVA to 3150kVA and system voltage up to 36kV and power transformers from 4MVA to 30MVA up to 52kV.
Special Application Fields:
- Power transformers
- Renewable energies (wind and photovoltaic)
- Traction applications
- Rectifier transformers with 3 or 4 windings
- Oil and gas platforms
- Industrial cranes
- Transformers with on-load tap changer
- Earthing transformer
- Excitation transformers
- Transformers for mobile substations
- Generator step-up
- Auto transformers
- Monophase transformers
Poles & Transmission line
AA GROUP is the Distributer of the poles for:
- Street lighting,
- Stadium lighting,
- Advertisement and logo panels,
- Traffic lights and road panels,
Our product range covers:
- Round Conical,
- Tubular types of poles.
For high-masts, AA GROUP Supplying for elevator system which is used for lifting of the crown with floodlights.
We have the ability to supply all types of poles stated above, according to the specifications of the customer. We can also supply any type of poles by using the design supplied by our customer as the case may be.
We further have the capability of erection and assembling of poles, as well as supply of supervision for erection.
Our customers are generally governmental or private institutions and contractors which use our products in their contracted projects.
Substations and overhead accessories
Substations and overhead accessories is a part of an electrical generation, transmission, and distribution system. Substations transform voltage from high to low, or the reverse.
AA GROUP known as one of the prominent suppliers of a comprehensive assortment,Our range of products include Helical Products for Hardware Fittings, Transmission Line Hardware Fittings, Double Tension Hardware Strings, Pole line Hardware Fittings, Universal Type Parallel Groove Clamps and Conductor Accessories.
AA GROUP supply metal accessories for overhead lines,including transmission line,power distribution line and substation line.Our line accessories are mainly conform with Standard. Material of our line fittings are steel ,stainless steel and aluminum or copper. For the steel items,they are all hot dip galvanized for anti-erosion.The oh-line accessories supplied by us are widely used in Middle East,Africa,Asia,Europe,from 11KV distribution line to 220kv transmission line.The types also cover a wide rangeincluding:
– Linking and splicing fittings
accessories Overhead Network:
11 Kv Post Insulator is a material whose internal electric charges do not flow freely; very little electric current will flow through it under the influence of an electric field. This contrasts with other materials, semiconductors and conductors, which conduct electric current more easily. The property that distinguishes an insulator is its resistivity; insulators have higher resistivity than semiconductors or conductors.
Power Pole Line Hardware Fitting Ball Eyes
hot-dip galvanized steel,Used for insulator string with hardware, wire clip and insulator string, connection between the wire and tower.
HDG Power Clamp Pole Line Hardware
Used to hold or secure objects tightly together to prevent movement or separation through the application of inward pressure.
Secondary Rack Insulators
For attaching secondary racks to tubular metal poles. Bands are equipped with 5/8″ x 2″ carriage bolts for attaching the racks, and 1/2″ x 1-5/8″ oval-shoulder clamp bolts for tightening bands on pole. Hot dip galvanized 1/4″ x 1-1/2″ steel. Made in two styles, the single type for attaching one rack and the double type for two racks.
FIBER GLASS ROD OF SILICON RUBBER INSULATOR
Fiber glass rod is used for production of silicon rubber insulator of electrical overhead lines. It is an important part of composite insulator and core material of composite insulator.Silicon rubber insulator is also recognized as composite insulator or polymeric insulator. One of its significant part,fiber glass rod, as it’s name, is made of fiber glass material and used as supporting core of silicon rubber insulator. The fiber glass rod consists of dozens of fiber glass threads which makes it enable to bear high tension load in vertical direction. This is also why fiber glass rod is selected as supporting core of composite insulators, especially on tension type insulators and suspension insulators on electrical overhead lines. The rod of polymeric insulator has very good performance on mechanical tensile property, while its cantilever load performance is not so optimizing as the tensile property. Even though in certain projects we use polymer insulator post type in power substation, its bending load and deflection have some problem compared with traditional ceramic post insulator.
Polymeric Insulators-composite pin type insulator-plastic coachscrew insulator
Composite pin type insulator and plastic coachscrew insulator are the common polymeric insulators used on distribution lines. Composite pin type insulator, also called silicone rubber composite pin insulator or polymer pin insulator, can take place of the porcelain pin insulator and used on high voltage overhead distribution lines with the voltage ranging from 6KV to 36KV. Composite pin type insulator is as per ANSI C29.11, ANSI C29.17, ANSI C29.18 and IEC61109. Plastic coachscrew insulator is used on low voltage lines.
Silicone Fiberglass Sleeving
- Silicone fiber glass braid material
- High temperature resistance
- High voltage withstand
- Flame retardant UL224 VW-1
- Good machanical properties
- Good insulation
- Good flexibility
- Passed the UL testing
Be Popular used in H-grade motors,home electrical appliances dieletric, ect
Ceramic Insulator-Overhead Line Insulator
Material: ceramic, porcelain insulator, reinforced glass insulator, silicone rubber, composite, polymer insulator Color: Brown, Grey, White, Blue insulator Type: IEC, ANSI, AS, BS DIN standard type, Orient design, customer requirement and drawings.
Spherical Warning Marker/aircraft warning ball for overhead wire
Aviation obstruction marking sphere is designed to provide the daytime visual warning or nighttime visual warning if comes with reflective tape, for electricity transmission line and overhead wire for aircraft pilots, especially cross river high voltage transmission lines. RedDot OMARK power line marker ball is made of high-grade Fiberglass Reinforced Plastics(FRP), the diameter of 600mm and 800mm are available to meet different customers’ needs.A marking sphere should be of one color such as aviation orange, white and red. Generally, the marking spheres are placed on the highest line. Where there is more than one line at the highest level, white and red, or white and orange spheres should be displayed alternately. This alternating color scheme provides the most conspicuity against all background.