Construction of three phase transformer

Each device is built on a configuration method Similarly, the structure of 3 phase transformers is discussed.

Construction of three-phase transformer

The construction of a three-phase transformer can be done in two ways

1. Transformer construction first method

A three-phase transformer is formed by three-phase winding as per rules in a three-phase core.

Advantages of Transformer construction first method

1. The amount of iron required to form the core is less
2. Placement takes less space
3. The amount of units is less
4. Convenient to maintain, repair, maintain
5. It is possible to manage with less manpower
6. Advantages of lightweight transfer
7. The amount of insulating oil is less

Disadvantages Transformer construction first method

if you lose a page at any time to repair the transformers of the system is to work out | This temporarily disrupted the supply

2. Transformer construction second method

Three-phase transformers can be formed by pairing three separate single phases together. This method is called transformer banking

Advantages Transformer construction second method

If one of the transformers breaks down at any time, the other two can be used without interruption of supply. 

Disadvantages of Transformer construction second method

1. It is large in size
2. Maintenance and maintenance are complex
3. It takes more manpower to manage
4. If a unit is damaged, power supply at full capacity is not available

Main parts of 3 phase transformer.

1. Low voltage winding

2. High voltage winding

3. Core

4. Oil level indicator

5. Conservator

6. Breather

7. Brain coke

8. Radiator tubes for cooling

9. Transformer oil

10. Earth point

11. Expulsion vent

12. Temperature gauge

13. Buchholz relay

14. Low voltage bushing

15. High voltage bushing

16. Thermometer

17. Carriage

1. Low and high voltage winding: -(high voltage and low voltage winding in transformer)

Two or more coils of a transformer These coils are usually made of insulated super enamel copper wire. The size of the coils is round, spiral ribbon, flat shape, etc.

The coils made in the shape of a certain shape are placed on a core The low voltage coil is attached to the core and the high voltage coil is wrapped around the low voltage coil.

The reason for doing this is so that it can be easily distributed from high voltage heat When a low voltage coil is placed on top of a high voltage coil, the heat radiation from the high voltage coil cannot be accelerated, which can cause the transformer core to overheat and weaken the insulation.

The number and size of the coil's patches are never the same It depends on the desired voltage and amount of current

2. Core: - (3 phase core type transformer)

The frame on which the points are wrapped is called a steel frame. Most of the three-phase transformer core type and in some cases fox type core is used. 

The three-phase core type has three parts and the fox type has five parts The coils are informed in these parts

Core use results in core losses, including AD current loss and hysteresis loss.

Core making

1. Cold rolled core

2. Hot rolled core

a.  Low carbon steel

b.  Silicon steel

c.  Nickel iron or permalloy

Silicon steel is used as a high-quality core material in a power transformer. The permeability of silicon steel is high The higher the saturation point, the higher the flux density and the lower the loss

Hysteresis loss can be reduced by using silicone steel The permeability of steel increases significantly with only 4% silicon alloy

The thickness of the core is 0.35mm for 50 HZ frequency and 0. 5mm for 25 HZ frequency.

3. Insulation: - (transformer insulation)

Transformer coils are insulated. They are covered with super enamel coating. Ampere leather wade paper is also used for making coils

 Both the low voltage coil and the high voltage coil have to be well separated by insulation. The core has to be varnished

Insulating strength is also increased by making large transformers and immersing the coils in insulating oil.

4. Tank: - (transformers tank)

The tank is made by welding and relating thick legs of steel. The top of the tank is fitted with a climate-repellent gasket and fastened with a nut bolt. 

The transformer core with winding is immersed in the oil in the tank. The core is tightened and restrained with the movement of the transformer tank. Different parts of the transformer are connected to its tank

5. transformer conservator:- ( conservator tank)

A round drum is placed on the top of the tank This drum is called Conservator It is connected to the tank through a pipe

 The oil pipe of the transformer enters the tank through the hole in the top of the conservator As the oil heats up and increases in volume, the oil pipe moves to the conservator 

When the volume decreases again in the cold, the conservator comes down to the tank The amount of oil in the tank is known by the Conservator Oil Level Indicator

6. transformer breather:- (silica gel breather)

The door used to enter the tank with water vapor i.e. dry air is called breathing. This is a glass jar

 When the oil is low or high, a pipe is attached to the top of the conservator to allow air to come and go.

Inhalation contains a type of white granular chemical called silica gel As it passes through the air, it carries water vapor into the air

 As a result of water vapor respiration, the normal color of silica gel is no longer white Depending on the amount of water vapor absorbed, its color is light pink

7. Bushing: - (transformer bushing)

The winding terminals are brought out of the transformer tank through the bushing. These are made of very good porcelain

These are placed on the lid of the tank with a gasket A bushing connects the service line and the terminal of the transformer welding.

 Their number, size, and connection method depend on the amount of voltage High side bushings are large in size and low side bushings are small in size

7. Oil: - (types of transformer oil)

The oil used in the transformer is used as insulation and to keep the windings including the core cool. Its trade name is Pyranol and silicon.

FAQ In  Construction of three-phase transformer

Q1. What materials are used as transformer insulation?

1. Leather wade paper, 2. Cotton, 3. Silk, 4. Wood, 5. Paper, 6. Fiber, 7. Resin, 8. Mica, 9. Varnish, etc.

Q2. Advantages of Transformer Banking?

If one of the transformers breaks down at any time, the other two can be used without interruption.

Q3. Where is the transformer conservator placed?

On top of the tank

If you have any doudts.Please let me know

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