Difference Between Power Transformer and Distribution Transformer

 Difference Between Power Transformer and Distribution Transformer

Here we will discuss, the difference between distribution transformer and power transformer. The difference is categorized on the factors like the type of network used, location of installation, usage either for low voltages or high voltages., the various ratings in which the power and the distribution transformers are available in the market.

 

The Basic Difference between the Power Transformer and Distribution Transformer

 

Along with this, the designing efficiency and the designing of the core, the types of losses occurring in the transformer, their operating conditions, and various applications are also important parameters.

The difference between the two transformers is given below:

 

BASIS OF DIFFERENCE	POWER TRANSFORMER	DISTRIBUTION TRANSFORMER
Type of network	It is used in transmission network of higher voltages	It is used in the distribution network for lower voltages.
Availability of ratings	400 kV, 200 kV, 110 kV , 66 kV, 33 kV.	11 Kv, 6.6 Kv, 3.3 Kv, 440 V,230 V
Maximum rating of usage	Power transformers are used for rating above 200 MVA	Distribution transformers are used for rating less than 200 MVA
Size	Larger in size as compared of distribution transformers	Smaller in size
Designed Efficiency	Designed for maximum efficiency of 100%	Designed for 50-70% efficiency
Efficiency formula	Efficiency is measured as the ratio of output to the input power	Here All Day Efficiency is considered. It is the ratio of output in kilowatt hour (kWh) or watt hour (Wh) to the input in kWh or Wh of a transformer over 24 hours.
Application	Used in generating stations and transmission substations	Used in distribution stations, also for industrial and domestic purposes
Losses	Copper and iron losses take place throughout the day	Iron losses take place for 24 hours and copper losses are based on load cycle
Load fluctuation	In power transformer the load fluctuations are very less	Load fluctuations are very high
Operating condition	Always operated at full load	Operated at load less than full load as load cycle fluctuates
Considering time	It is independent of time	It is time dependent
Flux density	In power transformer flux density is higher	As compared to power transformer the flux density is lower in distribution transformer
Designing of the core	Designed to utilize the core for maximum and will operate near to the saturation point of the B-H curve, which helps to bring down the mass of core	As compared to power transformer the flux density is lower in distribution transformer
Usage	Used to step up and step down voltages	Used as an end user connectivity

 

View the key comparison between power and distribution transformer with Yuebian transformers or just scrow down to learn more.

 

Power Transformer

 

The Power Transformer is installed at various power stations for generation and transmission of power. It acts as a step-up or a step-down transformer for increasing and decreasing the level of voltages as per the requirement, and it’s also used as an interconnection between two power stations.

 

Distribution Transformer

 

The Distribution Transformer is used to bring down or step down the voltage and current level of a transmission line to a predefined level, which is called safety level for the end-user consumer in domestic and industrial purpose.

 

Key Difference Between Power Transformer and Distribution Transformer

 

Power transformers are used in the transmission network of higher voltages whereas the Distribution Transformers are used in the distribution network of lower voltages.

The power transformers are available in various ratings of 400 kV, 200 kV, 110 kV, 66 kV, 33 kV in the market and the distribution transformer are available in 11 kV, 6.6 kV, 3.3 kV, 440 V, 230 Volts.

 

The power transformer always operates on rated full load as the load fluctuation is very less but the distribution transformer is operated at the load less than full load as the variation in the loads are very high.

 

The power transformers are designed for maximum efficiency of 100%, and the efficiency is simply calculated by the ratio of output power to the input power, whereas the distribution transformer the maximum efficiency varies between 50-70% and calculated by All Day Efficiency.

 

Power transformers are used in power generating stations and transmission substations, and the distribution transformer is installed at the distribution stations from where the power is distributed for the industrial and domestic purposes.

 

The size of the power transformer is large as compared to the distribution transformers.

 

In Power Transformer, the iron and copper losses take place throughout the day but in distribution transformer, the iron loss takes place 24 hours i.e., throughout the day, and the copper losses depend on the load cycle.

 

In this way, a power transformer is differentiated from a distribution transformer.

 

If you want to download difference between power transformer and distribution transformer pdf, please click our website.

 

As a professional China power supplier transformer, Yuebian has advanced production equipment and a complete product inspection system. Our transformers have high mechanical strength, balanced ampere-turn distribution and good short-circuit resistance.

 

Cooling Method of Three-phase Dry Type Power Transformer

 Cooling Method of Three-phase Dry Type Power Transformer Cooling System

The dry type transformer cooling is divided into natural air cooling and forced air cooling. In the case of natural air cooling, the transformer can be operated continuously for a long time and the rated capacity under normal use conditions. When forced air cooling, under normal conditions of use, the output capacity of the transformer can be increased by 50%, which is suitable for intermittent overload operation or emergency accident overload operation. Since the load loss and the impedance voltage increase greatly during overload, it is in a non-economic operation state, so it should not be subjected to long-term continuous overload operation.

 

For air natural cooling transformer, it is necessary to ensure that the transformer room has good ventilation capacity. When the transformer is installed in the basement or in a poorly ventilated environment, a cooling and ventilation device must be added. The fan air cooling system has low noise, uniform cooling and good effect. It is small in size and takes up little space and does not exceed the outline size of the transformer body.

 

The above is the cooling method of three-phase

dry type power transformer

(natural air cooling and forced air cooling). For more information, please pay attention to the official website of YueBian.

 

If you want to know more about cooling method of dry type transformer, please visit our website.

 

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Control Standard for Electrical Power Transformer Installation Process

 Control Standard for Power Transformer Installation Process

 

1. The basic track horizontal error is <3mm, the center deviation is <5mm, the insulation pad is ≤3 pieces per point, the welding is firm, and the two points of the track are grounded.

 

2. The lateral center deviation of the transformer body is ≤ 20 mm, the roller is flexible, and the roller brake is assembled firmly. The bell housing and the lower part of the fuel tank are grounded.

 

3. The transformer bell housing and the lower part of the fuel tank are grounded at not less than 2 points.

 

4. The ground of the transformer body is grounded at two points in different locations on the main ground network.

 

5. The iron core and the coil are intact, the insulating block is dense and loose, the oil circuit is not blocked, the insulation layer is evenly wrapped, the nail is fastened, and the lock nut is locked.

 

6. The tap changer leads are correct and firm, the contact is clean and flexible, the plug feels not inserted (0.05×10mm), the position of the switching device is correct, and the rotary shaft is operated evenly and flexibly.

 

7. The on-load voltage regulator must be implemented in strict accordance with the manufacturer's instructions.

 

8. There is no dirt and debris at the bottom of the box, the bell jar is fixed with anti-magnetic baffle, the flange is butt jointed, and the bolt tightening force is uniform.

 

9. The appearance of the casing is free from scratches, cracks and porcelain. The oil level is on the oil line and there is no leakage. There is no water and dust in the pressure equalizing hood, and the connection is tight.

 

10. The sleeve installation sealant ring is evenly compressed without leakage. The oil level indication is normal and the oil mirror direction is correct.

 

11. The gas relay installation arrow mark points to the oil pillow side, the vertical and horizontal axis is horizontal, and the verification fixed rope is removed in the relay, making the action flexible and reliable.

 

12. The appearance of the oil conservator is free from scratches and cleanliness, and the bellows is intact.

 

13. Raise the seat, connect the oil pipe, the radiator and other connecting ports, and the connecting bolts are tightly stressed.

 

14. Cooling fan motor, the insulation test of the submersible pump motor is flexible and the rotation direction is correct.

 

15. For the body inspection, the oil test must be done first. After passing the test, the core can be inspected. When the relative humidity of the air is less than 75%, the body should not be exposed to the air for more than 16 hours.

 

16. Gas relays and thermometers can be installed after passing the inspection.

 

17. The low-pressure side soft copper sheet phase and ground distance meet the specifications. The leads are securely connected and non-magnetic bolts are used.

 

18. The electrical transformer vacuum check and pressure check can be carried out according to the manufacturer's requirements.

 

19. The transformer high-voltage lead wire is fastened to the casing connecting bolt, and the electric grease is applied before the lead copper rod is connected to ensure good contact.

 

20. After the oil is completely oiled for 48 hours, the oil sample can be taken for inspection.

 

Welcome to buy the

electrical power transformer

of YueBian Electric Co.,Ltd.

 

If you wantto know more about the installation procedure of power transformer, please visit our website.

 

As a dry type transformer supplier, we will do our best to meet all the needs of customers.

 

Classification of Step-up Transformers (01)

 What Are the Classification of Transformer

 

Step up transformer is a machine which can start the voltage instantaneously. There are few domestic step up transformer suppliers that can effectively boost the voltage instantaneously. The step-up transformer has a strong ability to boost voltage instantaneously and has a good boost effect.

 

The classification of step-up transformer is as follows:

1. The High-Frequency Type

 

The high-frequency step-up transformer adopts high-frequency voltage multiplier rectifier circuit, which makes DC generator achieve high-quality and portable. It is composed of control box and voltage doubling device. It is equipped with protection resistor which has the functions of voltage zero gate protection, over-current and over-voltage protection. It is small in size, light in weight, easy to carry, convenient, safe and reliable. It is suitable for on-site DC high voltage test of power sector, DC characteristic test of arrester and other occasions requiring DC high voltage.

 

2. The DC Type

 

The DC step-up transformer has the characteristics of small volume, light weight, compact structure, complete functions, strong versatility and it is easy to use. It is especially suitable for power system, industrial and mining enterprises, scientific research departments and so on to have the common frequency or DC high-voltage insulation strength test on other high-voltage electrical equipment, electrical components, insulation materials. It is an essential equipment in high voltage test.

 

High Reliability: Improving product quality and reliability will be our unremitting pursuit. In the aspect of quality assurance system and reliability engineering, a lot of basic research should be carried out, and reliability certification should be actively carried out to further improve the reliability and service life of the transformer.

 

Environmental Protection Features: It has the properties such as heat resistance, moisture resistance, stability, chemical compatibility, low temperature, radiation resistance and non-toxicity.

 

As one of substation transformer manufacturers, we can offer kinds of compact substation transformer for sale, if you are interested, please leave us a message.

China S11 Oil immersed Power Transformer

 China S11 Oil immersed Power Transformer

S11 oil immersed transformer in China is a new type of high-performance transformer with more reasonable structure and better performance. Its three-dimensional winding iron core has no air gap in its magnetic circuit because its three core columns are three-dimensional arrangement of equilateral triangles, and its winding is closer. The length of the three magnetic circuits is the same, and all of them are the shortest. The cross-sectional area of the core columns is closer to the circle. Therefore, the performance is further improved, the loss is reduced, the noise is reduced, the three balances are reduced, and the third harmonic component is reduced. Therefore, the product is more suitable for urban and rural, industrial and mining enterprise power grid transformation, and is more suitable for combined transformers and prefabricated substation transformers.

 

China S11 china oil-immersed transformer canceled the oil conservator, and the wave fin of the corrugated fuel tank replaced the oil pipe as a cooling heat dissipating component. Corrugated fuel tanks are manufactured on high-quality cold-rolled steel sheets on dedicated production lines. The wave fins can be expanded and contracted as the transformer oil volume increases and contracts, thereby isolating the transformer from the atmosphere, preventing and slowing oil deterioration and insulation moisture, and enhancing operational reliability. It runs normally and is maintenance free.

 

The surface of the corrugated oil tank is painted with anti-oil, rust and phosphating treatments, and is suitable for use in metallurgical, petrochemical and other production environments. The body is fastened with a loose structure to ensure long-distance transportation and no looseness during operation. It uses high-quality rubber, sealing materials to prevent aging and prevent leakage. The fully sealed distribution transformer has a pressure relief valve and a thermometer.

 

The performance of China S11 oil immersed power transformer conforms to the national gb1094-1996 "Power Transformer" gb/t6451-1999 "Three-phase oil-invasive power transformer technical parameters and requirements" standard. The iron core is made of high-quality cold-rolled silicon steel sheet, with stepped three-level joints, and the surface is coated with curing paint to reduce the loss and noise; the coil is made of high-quality oxygen-free copper wire; the heat dissipation adopts the new oil passage structure, the design is reasonable, and the insulation is optimized. The process improves the mechanical strength and short-circuit resistance; the appearance is beautiful and the operation is reliable. It is widely used in substations (station) and urban and rural power grids.

 

As one of power distribution transformer manufacturers, we can offer different kinds of related products for sale, anything you need, please contact us.

 

Characteristics and Differences Between Double Winding Transformer and Autotransformer

 The basic working principle of the transformer is electrical equipment made by using the principle of electromagnetic induction. To put it simply: electricity generates magnetism, and alternating current is applied to the primary side to generate a changing magnetic field in the iron core chamber. The transformer can only input AC voltage. The AC voltage is input from both ends of the primary winding of the transformer. Then it is output from the secondary winding.

 

Ⅰ. What is a double winding transformer?

 

The so-called double winding transformer means only two windings in the transformer. There are two windings (two coils) on a phase iron core, one is the primary winding, and the other is the secondary winding. The double winding transformer is a commonly used transformer product. The winding process of the transformer will have different requirements according to different usage occasions (different purposes). Its main functions are voltage transformation, impedance transformation, isolation, voltage stabilization, etc.

 

Ⅱ. The characteristics of double winding transformers

 

The double winding transformer is composed of two windings wound on the same iron core, connected by alternating magnetic flux. The voltage with more turns is higher, while the voltage with fewer turns is lower. Therefore it can transform one level of voltage into another level voltage with the same frequency.

 

Ⅲ. The difference between single phase transformer and autotransformer

 

The primary and secondary windings of the double winding transformer are separately wound. Although each phase is installed on the same iron core, they are insulated from each other. There is only a magnetic coupling between the primary and secondary winding with no electrical connection.

 

The autotransformer actually has only one winding as the secondary winding connection is tapped from the primary winding. Therefore, there is also a direct electrical connection in addition to the magnetic connection between the primary winding and the secondary winding.

 

When a double winding transformer transmits electric power, it is transmitted by the electromagnetic induction between the two windings. When autotransformer transmits electric power, part of which is transmitted by electromagnetic induction, and the other part is directly transmitted through circuit connection.

 

Therefore, when the capacity of the transformer is the same, the winding of the autotransformer will be smaller than that of the double winding transformer. At the same time, the number of silicon steel sheets and wires used in the autotransformer is also reduced with the reduction of the transformation ratio so that the copper and iron losses are also reduced. And the excitation current of the autotransformer is also smaller than that of the double winding transformer. However, since the circuits of the autotransformer's primary and secondary windings are directly connected, an electrical fault on the high-voltage side will affect the low-voltage side. Therefore, appropriate protective measures must be taken.

 

As a reliable dry transformer manufacturer, we can offer kinds of dry transformer for sale, anything you need, please contact us.