40MVA/20kV split auxiliary transformer for factory

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Place of Origin: HeBeiBrand Name:


Model Number:




Phase: 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 40MVA/20kV split auxiliary 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 200-490 tons, and due to the restricted transport conditions, the transportation becomes the critical issue for application of the 40MVA/20kV split auxiliary 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 40MVA/20kV split auxiliary 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.


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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:Where can I buy transformers?
Transformers as in the action figures? You can find them at Toys R Us, Wal*Mart, or Target.
Q:Transformer alone as an audio amplifier ?
Technically No. The transformer will not amplify a signal, however it can be used to make sure you use any signal you actually do have to your best advantage. A transformer is generally used to achieve an impedance match between the signal source and load. For instance if you were to connect an 8 ohm speaker directly to a 1 kilohm signal source, most of the available signal would be dissipated in the source resistance and less than 1% of the signal would produce movement in the speaker. If however a 1k to 8 ohm transformer is used to match the source to the load,up to just under 50% of the signal will make it into useful energy in the speaker. This is a substantial gain in performance of the overall system but is not actually amplification.
Q:How do you choose the public transformer capacity?
In the actual choice, should adhere to the "small capacity, dense point" principle Distribution transformer location should be located in the load center, and the power supply radius of not more than 0.5 km. Distribution transformer load rate between 0.5 to 0.6 the highest efficiency, At this time the capacity of the transformer is called the economic capacity. But if the load is relatively stable, then the continuous production of the situation can be selected according to economic capacity transformer capacity.
Q:Transformers, broken, how to repair
You can first check the insurance, if only insurance problems, you can short-term insurance; the other can buy a replacement of the same specifications, the coil can also be broken coil rewind.
Q:Transformer or resistor?
I don't think there is any way to use resistors to increase voltage. Neon sign transformers are the usual choice, but they are not safe for humans. Death is not rare and they likely cause illegal radio interference. Voltage multipliers are likely safer, but the Jacob's ladder arc will be dimmer and shorter. Neil
Q:Should i get the Asus Eee Pad Transformer?
asus transformer is definately better than the ipad2. so far ipad 2 is nothing more than a fancy toy to glare at other than design cant give it any props. it makes even less sense to buy if you already have an iphone cause the only difference between the two is the size of the screen.
Q:How come step-up transformers reduce current in transmission lines?
E IR P (watts) I^2 R or E^2 / R there have to be TWO transformers. gererator medium V, I first step, up, Hi V low I, Transmission loss low; low I^2 x R line Second step, down V, Low (220 or 110) V; High I, 50 to 100 amp for house hold. high I on motors and lights, high heat loss. high I needed for motor torque. edison had DC, did not understand AC math DC required huge I in transmission lines and limited line lenght to a few miles at most. due to I^2 R loss. Without complex number math for AC Electrical calculations we would not have the same technology that we do have, or radio. Math is the queen of science, Nerds rule
Q:How is the insulation of the transformer divided?
The distribution of the impulse voltage on the winding is usually used as the basis for the design of the longitudinal insulation of the winding, but the inter-turn insulation should also take into account the effects of the long term power frequency operating voltage.
Q:physics transformer output and input question. help?
The transformer winding (primary or secondary) with the greatest number of turns has the least current. (The current in the secondary winding) [( the number of turns in the primary winding) / (the number of turns in the secondary winding)] x ( the current in the primary). Of course the primary current in any particular ideal transformer is determined by the load on that transformer. If there is no load then both primary and secondary currents are equal to zero.

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