220kV single phase traction transformer of AT power supply railway

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Place of Origin: HeBeiBrand Name:


Model Number:






Coil Structure:


Coil Number:

3 Winding

Capacity: Rated Voltage:


Connection Symbol:

YNd11 Dyn11 YNyn0d11


Cover type or Bell type


MR or ABB or SMS

Packaging & Delivery

Packaging Detail:Mainbody --naked Disassembled parts -- crate
Delivery Detail:3 months



1. CESI certificate
2. High short-circuit withstand
3. Low loss, PD and noise
4. CTQC certificate
5. No leakage




The application of the 25MVA/110kV railway balance traction transformer, and matches well with the transmission capacity of UHV lines, which has wide prospect of application. Because of its large capacity and large volume, the whole transportation weight with nitrogen is about 470-490 tons, and due to the restricted transport conditions, the transportation becomes the critical issue for application of the 25MVA/110kV railway balance traction transformer. In order to make the products applicable to any UHV substation in our country, the state grid of corporation of China set the "A study of easy-transport large capacity UHV Transformer” as a key scientific research projects, and entrusted BTW to carry out the research.

During the process of research and development, BTW adopted the advanced design technology and modular design, the transformer can be transported disassembly and with advantages of compact core and winding body, less transportation weight and low transportation cost, effectively solves the need of UHV construction in the transportation restricted areas. By using the most advanced 3D magnetic field calculation software, BTW performed detailed analysis and calculation for the magnetic flux leakage and eddy current loss of the transformer coil, iron core and oil tank steel structures. Besides, by using of the advanced electric field calculation software, BTW performed detailed analysis and calculation of main longitudinal insulation, and mastered the arrangement of the main longitudinal insulation of large capacity UHV transformer and the control of distribution of winding magnetic flux leakage. All of which make the products with low loss, low noise, small volume, strong anti short circuit ability, no local overheating and other significant advantages, and guarantee the long-term safe and stable operation.

The world's first on-site assembled large capacity UHV Transformer’s right at the first time once again filled the gap in the field of UHV transformer research after Chinese transformer industry overcame the difficulty of integral transport of the 25MVA/110kV railway balance traction transformer, which marks BTW has fully occupied the world transformer industry technical peak. The successful development of the product filled the gaps in the domestic technology and met the urgent need of UHV construction application in our country, greatly improved the technical level and manufacturing ability of BTW in terms of UHV Transformer products.


 Core: The three-phase three-pillar structure inside and outside the box rolling. Center column for the multi-step cross section. After rolling core using vacuum annealing to remove stress, bending clamping groove. Pull screw to tension the body. Core surface brush special angle glue, to ensure core is not deformed and not rust.

 Coil and the body: low-voltage coil made up of 1 to 6 wires together to four layers or double-cylinder type (500KVA and below), or spiral-type. High voltage coil axial direction Oil conduit and high-low voltage main oil gap are Stays curtain structure. Iron yoke insulation and trapezoid pads as one, so that the body uniform compression, body structure using the new safety board positioning, vertical and horizontal orientation, ensuring that is no displacement.

Tank: The ripple tank, sealed structure, no leakage, maintenance-free.


Our service


1. Before the order, you will be provided with our general product descriptions, a series of detailed account for commodity, instructions, quotation sheet and related qualification certificate to have a knowledge of our company and products.


2. After signing the technical agreement, the general assembly drawing, base drawing, drawing information and technical requirements will be offered. The technical requirements of agreement will be implemented strictly to provide new, advanced, mature and reliable products.


3. Guarantee all the process, components, accessories and test for products comply with the national standard or client-specified standard.


4. After products arriving, technicians will be sent to investigate on the site installation supervision, insure the perfect installation in the shortest possible time. During the debugging period, we also assist in the field test and debugging to make sure it running smoothly.


5. The technicians are responsible for the explaining of technical documents and drawing and answering and solving all problems about our products.


6. After sale, our company will make our every effort to fix the products and make sure it put into operation in time if any malfunction caused during the quality guarantee period.


7. We will keep the record of our clients and keep track of our sold products regularly, so that problems can be solved promptly.



Warranty or exchange does not apply under the following circumstances.

1) Damage caused by your failure to operation and maintenance.

2) Damage caused by power fail.

3) Damage caused by the maintenance or dismantle movement of a non-our-company authorized maintainer.

4) Damage caused by Natural disasters and other force majeure reasons such as earthquakes, fires.


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Q:2500KVA transformer rated current 3608A, how much can be overloaded current?
Transformer: Transformer (Transformer) is the use of electromagnetic induction principle to change the AC voltage of the device, the main components are primary coil, secondary coil and core (core). In electrical equipment and wireless circuits, commonly used as lifting voltage, matching impedance, safety isolation and so on. The main functions are: voltage conversion, current conversion, impedance conversion, isolation, voltage regulator (magnetic saturation transformer) and so on. According to the use can be divided into: distribution transformers, power transformers, sealed transformers, modular transformers, dry-type transformers, oil-immersed transformers, single-phase transformers, electric transformers, rectifier transformers.
Q:What is the meaning of the high voltage side and the low side of the transformer?
In general, the "high voltage side" refers to the "side of the high voltage side" (high pressure side) "low side" from the power supply to the primary side of the transformer (low voltage outlet) The From the wiring is also basically able to distinguish: high side (into the end) is generally "△" connection, low side (outlet) is generally "Y" connection.
Q:150KVA transformer can withstand much power, how to calculate
The power unit is watts (W). Power = current * voltage 1A * 1V = 1W Then 150KVA = 150KW that is 150 kilowatts!
Q:Production of high and low voltage switchgear transformer industry belongs to what industry category
Category C Manufacturing Electrical machinery and equipment manufacturing In the class 392 transmission and distribution and control equipment manufacturing
Q:Why 21 lighting transformers must use double-winding safety isolating transformers,
The double-winding type safety isolating transformer has two windings which are input (primary) windings and output (secondary) windings, and the two windings are insulated from each other, only by magnetic connection, that is, secondary Winding and the earth does not constitute a loop, if the use of additional insulation appliances, you should use a safe isolation transformer. And since the lotus transformer all of its winding are connected, by sliding the position of the contact to change the size of the voltage. Therefore, the autotransformer primary winding (power circuit) and the secondary winding (power supply circuit) is not only between the magnetic connection, as well as the direct connection of the circuit. It and the earth constitute a loop, so it can not be used as a safe voltage power supply. Therefore, the safety regulations: lighting transformers must use double-winding type safety isolation transformer, prohibit the use of autotransformers.
Q:The difference between the reflection impedance of the ideal transformer and the hollow core transformer is different.
The reflection impedance of the hollow core transformer reflects the influence of the secondary circuit on the primary circuit through the mutual inductance. The reflection impedance is in series with the self-impedance of the primary circuit. The reflected impedance of the air-core transformer is opposite to the reactance characteristic of the secondary circuit impedance.
Q:Why does the transformer have three lines
Transformer 3 into the line in the red and blue for the line of fire and the zero line (do not have to distinguish), the black line for the ground, if there is no power cord, you can not (empty). General table lamp with a 2-wire power plug, does not introduce the ground. Because the lamp in the circuit, the human body can not touch, not ground is safe.
Q:Two Transformers Parallel Operation
The total capacity of the two transformers in parallel is not a simple addition of the capacity of the two transformers. Even if the rated capacity of the two transformers is exactly the same, the impedance of the two transformers can not be exactly the same due to the existence of design / manufacturing errors. Based on the principle of the parallel circuit, the transformer with a small impedance will share a larger current, A transformer has been overloaded and another transformer is not yet fully loaded. Can be based on the measured value of two transformer impedance (on the nameplate). Calculate the transformer with a small impedance to reach full load, the load of another transformer, the sum of the two is the total capacity of the two transformers in parallel. In fact, the transformer capacity selection is usually about 25% greater than the actual load, so the reality is usually not a full load, while the other has been a serious overload situation.
Q:10 (6) What is the meaning of 10 and 6 in the KV transformer?
Are the high voltage side of the input voltage were 10KV and 6KV units of kilovolt
Q:How to understand the secondary side of the transformer
The side of the step-up transformer voltage is called the secondary side Buck side of the transformer voltage is called the secondary side In fact, by the power through the winding to stimulate the magnetic field called the primary side by the magnetic field induced by the energy called the secondary side If the three-winding step-down transformer voltage is the highest side of the second side of the winding is the second side

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