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Oil Type Power Transformer

  •  Generator Amplifier Transformers
    • Auto Transformers
    • Multiple winding and separate winding transformers
    • Shunt  Reactors (up to 50MVAR)
    • Furnace Transformers
    • Earthing Transformers
    • Mobile Centers
    • Converter Transformers
    are  produced.
    Yildirim Transformer is able to respond to all kinds of customer requests with its knowledge of design, production, testing and on-site assembly with its expert engineer staff and its hardware and equipment.
    Each transformer is designed with a tailor made approach considering its environmental and operating conditions. When designing the power transformer, the following factors that affect the efficiency and performance of the transformer are considered individually;
    • Optimization of design by considering material and labor costs
    • Loss assessment
    • Low noise level
    • Distribution of lightning strike on the coil
    • Insulation structural design optimization
    • Calculation of stray losses
    • Thermal behavior
    The purpose of Yildirim transformer is to fulfill customer requirements completely and to provide high quality to the customer. Yildirim transformer manufactures power transformers according to customer requirements, contract conditions and technical standards (TS 267 EN 60076-1, IEC 60076-1, BS 171, DIN, ANSI, ENEL, ENDOSA, CSA etc.).

Technical specifications

 

Nucleus (cores)
The low loss sheets with the directed grain are held to the slitting and grading process with our modern machines which we have at our own facilities and transformer cores are formed from these sheets according to the design.
Windings
The windings are formed using copper conductors. Paper-coated flat wires and CTC conductors are used as conductors. In accordance with the design of the windings, Disc, Helical, Floor winding ... etc are wound on vertical and horizontal machines.
Boiler
Boiler design is completely designed with 3-D Cad program considering installation, transportation and commissioning facilities. Membranes are used in expansion tanks that cut off contact with the atmosphere. All joints, welds and connections are checked and tested for oil leaks. Customer specifications and requests are complied with.
Cooling
• Transformers are cooled with removable radiator panels. Radiators are mounted on the tank surface in various ways according to the shape of the boiler.
• The most common types of cooling are (NAN / NAF) (OFAF), (ODAF), (OFWF), (ODWF). It is designed according to customer request.
• In addition to its expertise, ELTAS achieves the most appropriate result in transformer design with the help of engineering software and programs that are accepted and registered by the world.
Software used
• Reliable design,
• Electric forces within safety limits,
• Optimization of insulation structure
• Low probability of failure
• Long working life
• Optimized boiler design
• Boilers and equipment of appropriate light weight
• Low noise level
• Authentication
It provides.
 
Software used by ELTAS
3-D CAD
Transformer boiler, cooling equipment and active part are designed and drawn with 3D CAD program. This program provides fast results, mastery of details 

and minimization of errors.
ANSYS FEA
It is a simulation program used for mechanical analysis. The vibration levels in the transformer tank are calculated and compared with the measured.
 
SPECIAL SOFTWARE
• Two-dimensional design and axissymmetric electrostatic field calculation
• Calculation of shock wave distribution along windings.
• Calculation of the impact voltage value at any point of the windings.
• Short circuit forces calculation
• Calculation of electrodynamic forces in short circuit windings.
• Calculation of short circuit forces in active part carrier system in short circuit
Advantages of Software:
• Reliable design
• Electrical calculation within safety limits
• Robust construction in insulation
• Low fault
• Long life
• Low noise level
• Robust tank design

Auxiliary Equipment


The main accessories used to protect the transformers are as follows.
1. Oil Level Indicator
The magnetic oil level indicator is used to monitor and control the oil level in the expansion tank. Magnetic oil level indicator gives alarm and trip signal in case of sudden changes in oil level.
2. Air Dryer
Air dryers are used in transformers with expansion tanks. The air dryer is connected to the expansion tank. With the help of silica gel, moisture and dust are kept in the expansion tank. The amount of silica gel depends on the amount of oil in the transformer.
3. Oil Temperature Display
The oil temperature gauge placed in the thermometer pockets welded on the lid or on the sides of the tank monitors and controls the top temperature of the oil. It can be with maximum indication, without electrical contact or single or double electrical contact. If the temperature exceeds the estimated values, the contact thermometers give an alarm or trip signal.

4. Buchholz (Gas collection and Alarm) Relay
The Buchholz relay collects gases generated by low and high intensity discharge and arcs within the transformer. It is used in transformers with expansion tanks. The relay can be single or double contact. If a certain amount of gas is collected in the Buchholz relay, it activates both the alarm and the trip signal. In addition, the Buchholz relay emits an alarm signal at a low oil level. The Buchholz relay detects faults such as overheating and signals to prevent the failure from growing.
5. Pressure Relief Valve
Even if a hermetic protection relay is used in transformers, a pressure relief valve is also used. The pressure relief valve serves to relieve the rising pressure in the transformer.

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