250MVA/242kV three phase combined shell type transformer for hydro power station

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Place of Origin: HeBeiBrand Name:


Model Number:




Phase: threeCoil Structure:


Coil Number: 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 250MVA/242kV three phase combined shell type transformer for hydro power station.can significantly improve the economy of the OLTC substation, and matches well with the transmission capacity of OLTC 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 the 250MVA/242kV three phase combined shell type transformer for hydro power station. In order to make the products applicable to any OLTC substation in our country, the state grid of corporation of China set the "A study of easy-transport large capacity OLTC 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 OLTC 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 OLTCtransformer 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 OLTC Transformer’s right at the first time once again filled the gap in the field of OLTC transformer research after Chinese transformer industry overcame the difficulty of integral transport of the 250MVA/242kV three phase combined shell type transformer for hydro power station, 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 OLTCconstruction application in our country, greatly improved the technical level and manufacturing ability of BTW in terms of OLTC Transformer products.


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Q:How to use a multimeter to determine the quality of small transformers
Small transformer primary coil is generally 1 ~ 2k ohm, the secondary coil tens of ohms. If the problem with a multimeter measuring coil or open circuit, or open. There is also a fault that there is a short circuit in the middle of the coil, so that you only take the same transformer to compare the coil resistance.
Q:How many transformers are used in a hundred households?
Depending on the specific use of electrical power. First select the rated voltage of the transformer. The voltage on the high voltage side is equal to the voltage of the connected grid. The voltage on the low voltage side is 10% or 5% higher than the voltage of the low voltage side (depending on the voltage level of the transformer and the magnitude of the impedance voltage). Calculate the size of the load carried by the transformer (requires the maximum statistical load, the conversion of the operating load kW value into apparent power kVA). If two transformers are used, the capacity of each transformer can be selected according to 70% of the maximum integrated load. The transformer should be considered for the total load and leave the appropriate margin. Other brand name parameters can be combined with the appropriate consideration of the transformer product. For example: select 35 / 10kV transformer. Assuming a maximum load of 3500kW, power factor of 0.8, choose two transformers, capacity S = 0.7 × 3500 / 0.8 = 3062kVA, 3150kVA transformer can choose, the voltage ratio of 35kV / 10.5kV. Select the model from the catalog.
Q:Transformers have any way of cooling
Selection of strong air-cooled cooling mode, when the pump and fan lose power supply, the transformer can not run for a long time. Even if no load can not run for a long time. Therefore, two separate power supplies should be selected for use by the cooler.     When the oil-water cooling method is selected, it can not be operated when the pump cooling water loses power. The power supply should select two independent power supplies.
Q:please help physics transformer?
No, it can't. If it is connected to 120VDC, the output will give an initial pulse that decays to zero and stays there. The input will draw far more current than designed, overheat, and either open up or catch on fire. Here is how a transformer works with AC: The input winding generates a magnetic field (because it is an electromagnet). The field alternates because the applied current alternates. The alternating magnetic field couples into the output winding where it induces an electric voltage that alternates because the magnetic field is alternating. Now here's the kicker. The voltage induced in the output winding is proportional to the rate of change of the fluctuating magnetic field. If the field is static (ie, steady, as is the case if the input winding is powered by DC), then the rate of change is zero and the induced voltage is zero. That's why the transformer can't transform DC. Other interesting facts: The input winding converts electrical energy into energy in the magnetic field that is then converted back into electrical energy in the output winding. The input winding resists DC current based on the winding's resistance. If the input current is alternating, then it resists the current additionally based on the inductance of the winding, and the higher the frequency, the more it resists. A transformer is designed to work on a specific frequency (eg, 50Hz or 60Hz). Operating it at 0Hz (DC) will allow too much current to flow. The higher the applied frequency, the more power the transformer can transfer. Think of it as though the transformer passes a bucket of energy from input to output on each cycle. The more cycles per second, the more energy per second, aka the more power. At 0Hz (DC), it isn't passing any buckets of energy. Hope that helps.
Q:Does a transformer burn and blast with overloading?
Yes the transformer will burn and blast if overloaded.It results due to heating effect
Q:How do I determine if a transformer is beyond the normal temp range and is at risk of failure?
The first think you need to do is determine what the transformer's ratings are. The fact that i's nominally a 225kVA unit is only part of the story - what kind of insulation does it have, and what is the overtermperature capability of that insulation? Second, you need to determine what kind of cooling the transformer has, and whether that cooling is working properly. Some transformers are cooled only by exposure to ambient air, while other transformers are equipped ;with fans to blow air across cooling fins. Measuring the temperature of the coils using an external thermometer isn't appropriate - the limitation on transformer is the temperature internal to the winding. Is the transformer equipped with an interman temperature sensor? If not, then you can only base you conclusion on loading. I don't know what you mean when you say parallel 750's off the load side. You will need to determine the loading on the transformer, and compare that with the full rating of the transformer including any adjustment for cooling and ambient air temperature.
Q:polyphase transformer?
1. unsure you would need to read up on that there are plenty of books on power distribution I get the feeling an explaination wouldnt help you without a bit of research first 2. power transformers are manufactured to a certain specification eg 11,000 in 415V out, the output voltage is dependant on the ratio of windings 3. if the turns ration is 1:100 ie if the primary winding has 1 turn and the secondary winding has 100 turns then the voltage on the secondary will be 100 times that of the primary. (not sure if i have answered your question but i tried!)
Q:Microwave transformer wires?
I believe the two tabs on the lower part of the transformer on your first photo, is where the mains voltage is applied ( 120 or 240 volts AC depending on country used ). If you use an ohmmeter and measure for resistance, there should be a low resistance between the two tabs, and infinite resistance to the other wires and infinite resistance to the frame of the transformer. On the second photo: The two wires will have a high voltage AC output on them when measured from either wire to the frame of the transformer. One end of the high voltage winding is attached to the frame of the transformer as a ground return. You can see the attachment near the top of the transformer. There is also a voltage superimposed between the two wires on the second photo. This is used to heat the filament of the magnetron tube. If you measure the resistance between the two wires you should get a very low resistance. If you measure from one wire and the frame of the transformer, you should get a higher (but not infinite) resistance.
Q:Engineers Question about Transformers?
In my area there are sometimes 3 or four transformers on a pole. This is a residential area though and a lot of the houses use electrical resistance heating. Looking at the transformers on the nearest pole I see see two wires output and a ground cable coming from each transformer. The transformer coming to my home is single phase 240 volt ( 120V on each hot line). The transformers are rated at 50 kva, so I'm assuming four 50 kva transformers was probably cheaper and more flexible than using one 200 kva transformer.
Q:This transformer outputs AC or DC
If you have 220V output voltage, then the peak voltage of the waveform is 220 * 1.414 = 311v, then your rectifier at least reverse voltage of not less than 400V, then the voltage is not more than 400V The Look at your transformer current, if the full load current is 7A, then your rectifier load capacity should not be less than 10A. So the main consideration is the rectifier voltage and current these two aspects.

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