3 Phase Autotransformer

Shuogong Power is a leading 3 phase autotransformer manufacturer and supplier in China. We design and manufacture a wide range of 3 phase autotransformers and 3 phase isolation transformers, ranging from 0.5VA to 500KVA. Our 3 phase autotransformers are versatile enough to meet your various voltage conversion needs. We also accept a variety of non-standard voltage customization Shuogong strong R & D team is always at your service.Welcome to contact us for 3 phase autotransformer price

Three-phase autotransformer

3 phase autotransformer model

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35KVA 3 phase autotransformer

High quality 35KVA 3 phase autotransformer for sale at manufacturer's price. The total power of this 35KVA 3 phase autotransformer is 35KVA, its main function is to step down, it

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30KVA 3 phase autotransformer

High quality 30KVA 3 phase autotransformer for sale at manufacturer's price. Shuogong Power is a factory with more than 10 years of experience in transformer manufacturing. We are committed to

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25KVA 3 phase autotransformer

3 phase autotransformer from professional manufacturer. Rated capacity 25kVA, designed to step down high voltage 380 volts to 220/200 volts, for AC circuits 50 Hz or 60 Hz, self-cooled or

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20KVA 3 phase autotransformer

Are you looking for a high quality affordable 20K transformer? At Shuogong Power you can get manufacturer discounted prices. This 20KVA 3 phase autotransformer has a total power of 20KVA,

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15KVA 3 phase autotransformer

Are you looking for a 15KVA 3 phase autotransformer with stable quality? Here you can get exclusive discounted prices from transformer manufacturers. The total power of the 15KVA 3 phase

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10KVA 3 phase autotransformer

10KVA 3 phase autotransformer manufacturer price for sale online, the total power of 10KVA 3 phase transformer is 10000VA, it can meet the needs of your equipment for various voltages.

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8KVA 3 phase autotransformer

8KVA 3 phase autotransformer for sale online at manufacturer price. A 3 phase autotransformer with a total power of 8000VA accepts customization for various voltage requirements. 8KVA 3 phase autotransformer

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5KVA 3 phase autotransformer

The 5kVA 3 phase autotransformer is a dry-type autotransformer. It mainly steps down the three-phase 380V input to 220V/200V output. The applicable frequency is 50Hz/60Hz. It can be self-cooled or

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3 phase autotransformer Technical Parameters

Three phase transformer has enough power, the wiring is tight and neat, and does not skip turns. Coils adopt insulated H-class enameled wire, with low no-load current and low loss.

3-phase autotransformer has built-in silicon steel sheet, which has good magnetic flux performance, high heat dissipation coefficient and low magnetic loss.
The autotransformer uses electrophoresis technology clamps, no burrs on the edges, rounded corners to prevent collisions, and not easy to corrode.

Tinned copper tube terminals and rail-type wiring ports are convenient for wiring and ensure that the power-on overload capacity is increased to the extreme.

3-phase autotransformer application:

Three-phase transformers can be used in CNC machine tools, SMT, printing machines, EDM machines, automatic plug-in machines, precision measuring equipment, laser cutting machines, plastic molding machines, medical monitoring systems, PCB drilling machines, laboratory equipment, military instrument control centers etc.

Phase3-Phase Autotransformer
Capacity1KVA to 500KVA optional
Input VoltageAC 380V
Input Current1.5A
Output Voltage (Optional)AC 220V, 200V
Output Current2.6A (220V), 2.8A (200V)
Frequency50Hz / 60Hz
Winding Material (Optional)Aluminum Wire, Copper Wire
Cooling MethodSelf-Cooling or Wind-Cooling
Working Efficiency≥98%
Waveform DistortionNo distortion (compared with output wave)
Insulation Resistance≥ 150MΩ
WiringYn0
Electrical StrengthPower frequency sinusoidal voltage 3000V lasts for 1 minute, no breakdown and flicker
Overload ProtectionCan withstand instantaneous 2 times the rated current
Moisture-Proof Type (Optional)Open type, sealed type
Ambient Temperature-20℃ ~ +45℃
Altitude≤ 2500m
Relative Humidity0-95%
Noise≤35dB (within 1 meter)
Design Service Life20 years
Use EnvironmentNo explosion, rain and snow corrosion place, and no gas and conductive dust in the medium that can corrode metal and damage insulation
Weight (Enclosure Included)Please check the spec sheet
DimensionPlease check the spec sheet

Specification

Without Case Size(length width height mm)

Weight(kg)

1KVA

183

120

165

11

2KVA

183

130

165

15

3KVA

230

130

195

23

5KVA

230

160

210

30

8KVA

310

170

240

50

10KVA

310

185

240

60

15KVA

310

220

250

72

20KVA

360

280

360

90

25KVA

360

290

350

110

30KVA

360

300

350

125

35KVA

430

260

410

135

40KVA

430

270

420

145

50KVA

430

270

420

175

80KVA

480

330

430

210

100KVA

480

340

460

290

120KVA

480

360

460

330

150KVA

720

330

610

360

200KVA

800

400

730

480

250KVA

830

420

760

520

300KVA

900

450

900

800

400KVA

950

480

980

1200

500KVA

960

500

980

1500

Vido

3 phase autotransformer related products

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SHUOGONG is the best manufacturer of transformers and voltage regulators in China, you can choose standard transformer products or custom-made transformers and voltage regulators for special voltages.

Best Industry Leaders

A manufacturer of transformers and voltage regulators with 16 years of production experience.

Be your transformer factory

Accept special customization and OEM service.

Professional Certification

Strict quality management, through CE certification.

3 phase autotransformer Buying Guide

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1. What is a 3 phase autotransformer

3-phase autotransformer is a kind of autotransformer, which is mainly used in high power transmission and transformation occasions.

3 phase autotransformer

A 3-phase autotransformer is a special transformer in which the output and input share a set of coils.

Step-up and step-down are implemented with different taps, and the voltage of the part of the tap less than the common coil is reduced, and the voltage of the part of the tap more than the common coil is increased.

In fact, the principle is the same as that of ordinary transformers, the difference is that the primary coil is the secondary coil. In general transformers, the primary coil on the left generates a voltage through electromagnetic induction, and the autotransformer is its own influence.

A 3-phase autotransformer is a transformer with only one winding. When used as a step-down transformer, a part of the turns is extracted from the winding as a secondary winding; when used as a step-up transformer, the applied voltage is only applied to one part of the winding. on the turns.

2. 3 phase auto transformer working principle

The working principle of the 3-phase autotransformer is Faraday’s law of electromagnetic induction. According to this principle, as long as the magnetic field and the conductor change relatively, an electromotive force will be induced in the conductor. Consider a two-winding transformer as shown below.

3-phase autotransformer working principle

When an AC voltage is applied to the primary winding, it induces an electromotive force in the primary winding due to the alternating nature of the magnetic field created by the AC source and the static conductors.

According to Faraday’s law of electromagnetic induction, there must be a relative displacement between the field and the conductor, in which case the field is alternating and the conductor is constant.

Therefore, an electromotive force is induced in the primary winding of the transformer.

Now consider the autotransformer circuit diagram shown in the figure below. Compared to the two-winding transformer shown in Figure 1, an autotransformer has a single winding.

When AC power is supplied to the primary circuit, due to Faraday’s law of electromagnetic induction, an electromotive force is induced in the primary part. Since the magnetic field is alternating in nature and the conductor is stationary.

3-phase autotransformer working principle

The induced EMF in the primary produces a magnetic flux, called the primary winding flux. This flux connects the secondary winding and induces an electromotive force on the secondary winding due to mutual inductance.

Therefore, the electromotive force is transmitted in the secondary winding. According to the number of turns on the secondary side, the magnitude of the induced electromotive force is determined.

3. 3 phase auto transformer uses

The 3-phase autotransformer has a wide range of applications. It is mainly used to connect power systems of different voltages or improve the quality of line voltage. It can also be used as AC motor step-down starting equipment and laboratory voltage regulation equipment, etc.

4. 3 phase auto transformer kva calculation

A transformer is used to convert the incoming voltage at the location to the correct voltage for the electrical device (the submersible motor in case of ESP). Transformer selection is based on mainly 4 parameters:

  • Power rating in KVA (Kilo Volt Amperes),
  • Primary voltage,
  • Secondary voltage,
  • Tap arrangement.

We’ll detail how to calculate the required KVA for a 3 phase autotransformer. Actually, The calculation of KVA capacity for a Three Phase Transformer is based on Winding Voltage and Amperage information. The simple formula to calculate the rating of three phase Transformers are:

KVA = (√3. V x I) /1000
Where: V is the voltage (volts) and I is the current (amps).

5. 3 phase auto transformer connection

3 phase auto transformer connection

The autotransformer can be connected in parallel with loads when a voltage transformation is required. The load must be balanced and unbalanced. In the case of an unbalanced load, it is necessary to use a neutral grounding transformer. Connecting an autotransformer for parallel operation follows the same procedure as connecting any other alternating current transformer.

To connect an autotransformer for series operation, first determine which phase is connected to ground (zero potential) and which phase has no connection to ground (floating).

This can be accomplished by measuring voltage between each pair of phases using a voltmeter or power analyzer.

If two phases are at zero potential while the third remains floating then all three phases are connected in series across the source voltage terminals A1-A2-B1-B2-C1-C2; if any two phases have equal potentials while one remains at zero potential then all three phases are connected in parallel across the source voltage terminals A1-A2; if two out of three have equal potentials while one remains at zero then all three are connected through each other such that their individual connections form part of another circuit consisting entirely from connections within this group plus additional connections inside this group between each pair used for connecting its members together

6. Advantages of 3 Phase Autotransformers

3-phase autotransformers have many advantages over traditional double-wound transformers.

For the same VA rating, they are generally more efficient, smaller in size, and because they require less copper in the construction, they cost less than double-wound transformers of the same VA rating.

In addition, they have better voltage regulation than equivalent two-winding transformers due to their lower core and copper losses, I2R, due to their lower resistance and leakage reactance.

Other advantages of a 3-phase autotransformer over a two-winding transformer are:

  • cheaper
  • Higher efficiency because losses remain the same as rating increases compared to conventional transformers
  • lower excitation current
  • better voltage regulation

7. Disadvantages of 3-Phase Autotransformers

Some of the disadvantages of 3-phase autotransformers are:

  • higher short-circuit current
  • No isolation between primary and secondary windings
  • Only suitable for moderately small voltage changes

8. 3 phase autotransformer price

3-phase autotransformers are available in a wide range of prices. First of all, if you want to buy a 3-phase autotransformer, you must first select the power and input and output voltage of the transformer.

This will allow you to get the correct 3-phase autotransformer quote.

Below I have listed the market prices of some commonly used 3-phase autotransformers. for reference only.

This price does not represent the price of Shuogong transformers. If you have a demand for the price of our transformers, you can contact us to inquire.

ItemsPriceInput VoltageOutput Voltage
1KVA 3 phase autotransformer price$873.69380V220V/200V (Optional)
5KVA 3 phase autotransformer price$1,617.54380V220V/200V (Optional)
15KVA 3 phase autotransformer price$2,333.23380V220V/200V (Optional)
25KVA 3 phase autotransformer price$2,884.31380V220V/200V (Optional)
30KVA 3 phase autotransformer price$3,152.31380V220V/200V (Optional)
45KVA 3 phase autotransformer price$4,724.92380V220V/200V (Optional)
75KVA 3 phase autotransformer price$6,599.92380V220V/200V (Optional)
100KVA 3 phase autotransformer price$7,859.31380V220V/200V (Optional)

9. How to choose transformer manufacturers and suppliers?

We all know that there are many transformer manufacturers and suppliers in the world, so how should we choose?

First of all, you should consider the technical level of transformer manufacturers, whether they have strong research and development capabilities, and whether they can meet your needs, especially for some special voltages.

Secondly, you should consider the cost of your transformer, including the price of the transformer, the shipping cost of the transformer, etc.

In addition, you should also consider the after-sales service of the transformer. Although the probability of transformer problems is relatively low, we still have to take this problem into account. How about the after-sales capabilities of transformer manufacturers and suppliers? Can they provide services such as returns and exchanges. These are very important.