Product Description:
Quick Details
Place of Origin:  HeBei  Brand Name:  CNBM  Model Number:  
Usage:  Power  Phase:  Three  Coil Structure:  Toroidal 
Coil Number:  3 Winding  Capacity:   Rated Voltage:  240MVA/345kV 
Connection Symbol:  YNd11 Dyn11 YNyn0d11  Tank:  Cover type or Bell type  OLTC:  MR or ABB or SMS 
Packaging & Delivery
Packaging Detail:  Mainbody naked Disassembled parts  crate 
Delivery Detail:  3 months 
Specifications
1. CESI certificate
2. High shortcircuit withstand
3. Low loss, PD and noise
4. CTQC certificate
5. No leakage
Description
The application of 240MVA/345kV threephase OLTC autotransformer can significantly improve the economy of the UHV substation, 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 470490 tons, and due to the restricted transport conditions, the transportation becomes the critical issue for application of the 240MVA/345kV threephase OLTC autotransformer. 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 easytransport 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 longterm safe and stable operation.
The world's first onsite 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 240MVA/345kV autotransformer, 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.
 Q:National Standard for Transformer Life
 3, this life is in the case of rated operation (rated capacity to run). How much time is the transformer running? So in normal circumstances, this 20 or 30 years is fully able to do.
4, now, how many transformers are life and scrapped? Often the life cycle has not arrived, the transformer is eliminated. The reason is: 1) economic development is too fast, the transformer to increase the capacity, and to replace the transformer. 2) Transformer technology development fast, power transformer almost every 35 years out of a new product, the loss is also constantly in the drop. For these reasons, the transformer is less than 2030 years to be updated. So no one is very concerned about this life.
Guidance of the national standard for you  Guidance on the load of oil  immersed power transformers GBT 151641994.
Transformer machinery industry standard GB / T 174681998 "power transformer selection guide" in Article 8 transformer thermal aging rate and life of the "transformer life is generally 20 years."
 Q:The zero line of the transformer can be connected with the ground wire. Why not leave it?
 Now the transformer, if the secondary side of the leakage protection, the user also received a leak, the zero line and ground must not be connected
 Q:How much W?
 Ee22 how much of the transformer can be related to the material used. If the material is good, high frequency loss is relatively small.
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). The main functions are: voltage conversion, current conversion, impedance conversion, isolation, voltage regulator (magnetic saturation transformer) and so on.
According to the purpose can be divided into: power transformers and special transformers (electric furnace change, rectifier, frequency test transformer, voltage regulator, mine transformer, audio transformers, IF transformers, highfrequency transformers, impact transformers, instrument transformers, electronic transformers , Reactors, transformers, etc.). Circuit symbols commonly used as the beginning of the number. Example: T01, T201 and so on.
 Q:What is the reason why the dry transformer is loud
 500kva below the drytype transformer noise 56 to 58 dB or so, 630kva above 62 to 65 dB or so! This is our factory data. The drytype transformer sound is great. Big like cattle called the same, because the core is loose!
 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:Two different impedance of the transformer, parallel load how to allocate?
 Two parallel operating impedance must be equal, because the parallel operation of the transformer load is inversely proportional to the impedance voltage distribution, if the impedance voltage difference is too large, will lead to the occurrence of excessive impedance voltage overload phenomenon is recommended to allow the difference is generally not more than 10% ,
The general formula is St1 = S * Zt2 / (Zt1 + Zt2), St2 = S * Zt1 / (Zt1 + Zt2), where Zt is the per unit value, Zt = Uk% * Sd / 100Sn
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). The main functions are: voltage conversion, current conversion, impedance conversion, isolation, voltage regulator (magnetic saturation transformer) and so on. According to the purpose can be divided into: power transformers and special transformers (electric furnace change, rectifier, frequency test transformer, voltage regulator, mine transformer, audio transformers, IF transformers, highfrequency transformers, impact transformers, instrument transformers, electronic transformers , Reactors, transformers, etc.). Circuit symbols commonly used as the beginning of the number. Example: T01, T201 and so on.
 Q:800kw motor how much transformer
 Transformer power factor is generally 0.8 (also 0.7), then the total power transformer = 800 / 0.8 = 1000KW.
According to the "Power Engineering Design Manual", the transformer capacity, for a simple load of a single transformer, the load rate is generally about 85%, so the above example, the transformer capacity = 1000/85% = 1176KVA, select 1176KVA above capacity transformer.
If it is a single motor, due to the starting current, even if the measures taken, but also increase the corresponding transformer capacity.
If the threephase imbalance, but also a corresponding increase in transformer capacity.
 Q:500KW load should be installed how much transformer?
 P = 500KW cosφ = 0.8
Apparent power S = P / cosφ = 500 / 0.8 = 625KVA
You should choose the power of 625KVA transformer. Because there is no 625 series of products, you should choose a capacity of 630 kVA above the transformer.
If it is with the motor and other loadbased, due to power factor and startup current reasons, at least 900 kVA more appropriate. If the drive is more than 200 kilowatts, the starting current is very large, you need to put a larger margin or the motor using the buck mode (increase the investment cost).
 Q:How do I choose a transformer? The
 Select the transformer, you can not choose too large, can not choose too small According to the following method to select the transformer capacity.
There is a very important data is not provided, is the load at the same time coefficient. Transformer with the actual load and equipment rated power ratio is called the transformer load factor. The concept of the load factor for the load is the probability that the load is used at the same time, also called the coefficient or the simultaneous coefficient, which is the probability of simultaneous use of the device. The total load is 300kw, but they are used at the same time there is a probability that the probability is the load factor. It is impossible to always use at the same time. Of course, you can according to the actual situation to calculate their own, power factor selected 0.80.
With this formula, s = p * kX / cosφ
Transformer capacity s = device rated power p × transformer load rate kx / power factor cosφ = (300 × kX) × 0.80
This is the transformer capacity.
Do not know what the motor is used under the circumstances, so it can not be calculated, and only calculate the same time after the generation of the formula into the above formula. If the coefficient is 0.9, then the results of about 340 kVA, are used at the same time, that is, 375KVA, consider a certain margin and spare capacity, that can choose 400KVA.
In addition to the above considerations, in particular, consider the motor starting current factor, select the transformer more reliable. As far as possible by the big do not rely on small. And the standard capacity of the transformer level 315,400,500,630KVA, 315KVA a little small, 500KVA big and no need. So choose 400kvA it
 Q:What is the transformer capacity ratio? Capacity than 100%.
 Transformer capacity is the power of the transformer, the capacity ratio is the power ratio, such as 1000KA transformer and 200KVA transformer is not suitable for parallel use. Capacity ratio = 5: 1 greater than 3: 1
Capacity than 100%  is the meaning of 1: 1 (such as 500KVA and 500KVA, 200KVA and 200KVA and so on.
Transformer side by side conditions:
① to participate in parallel operation of the transformer must be the same wiring group.
② the primary voltage of each transformer should be equal, the secondary voltage are equal. Otherwise the secondary side of the circulation caused by overload, heat, affecting the load, and increase the power loss, reduce efficiency;
③ the transformer impedance voltage (short circuit voltage) percentage should be equal, or with load after the load distribution unreasonable.
Because the large capacity of the transformer short circuit voltage percentage, small capacity of the transformer short circuit voltage percentage is small, and the load distribution and short circuit voltage percentage is inversely proportional to this will cause large transformer distribution load is small, the equipment is not fully utilized; and small transformer distribution of the load Large, easy to overload, limiting the parallel operation of the transformer with load operation.
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