380MVA/525kV single-phase double winding generator transformer Power Plant

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Place of Origin: HeBeiBrand Name:


Model Number:






Coil Structure:


Coil Number:

2 Winding

Capacity: Rated Voltage:


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YNd11 Dyn11 YNyn0d11


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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 380MVA/525kV single-phase double winding generator transformer Power Plant.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 380MVA/525kV single-phase double winding generator transformer Power Plant. 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 380MVA/525kV single-phase double winding generator transformer Power Plant, 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 test the transformer capacity
If the temperature rise of a transformer is less than 55 degrees, it can be considered to achieve the design capacity.   As the temperature rise test time is long, the customer can not track the whole process, some bad transformer manufacturers in which mischief, cut corners, made the transformer can not reach the design capacity.
Q:What is the difference between the SGB10 transformer and the SC (B) 10 transformer?
Both transformers are dry transformers. 1, SG (B) 10 is an open dry change, he used the United States DUPONT company's NOMEX insulation paper insulation (high voltage coil, you can see is white, if it is darker that is covered with glass wire The former is American technology, the latter is German technology.) The low voltage coil is a copper foil (there is a B in the model that is made of copper foil). The same is true of B in the SC (B). High and low coils are insulated with VPI (vacuum pressure dipping). The surface of a layer of epoxy resin insulation paint wrapped up. 2, SC (B) 10 model means that the epoxy resin pouring dry change (low pressure is copper foil). The high voltage coil is sealed with an epoxy resin, but the low pressure coil epoxy is hard to pour in, but at the end of the coil is sealed with an epoxy resin. 3,10 is the design serial number, representing the loss standard value. 4, there is a dry change, model SCR (B) 10, he is non-epoxy resin casting package. All with NOMEX paper plus silicone encapsulation is the French technology. This product yield less, better quality. Maybe the price will be higher. You can also look at it. 5, is currently in the country is the three kinds of technology transformers. Epoxy resin pouring products are mostly "F" class insulation level, a few also have "H". SG (B) 10 majority is "H" level. , A few are "C" level. SCR (B) 10 is "H" level. If you still want to know what, you can give me a message.
Q:Transformers are divided into several. What is the role of each? To be specific!
Types and characteristics of commonly used transformers      Commonly used transformer classification can be summarized as follows:      1, according to the number of points:      (1) single-phase transformer: for single-phase load and three-phase transformer group.      (2) three-phase transformer: for three-phase system of the rise and fall voltage.      2, according to the cooling method points:      (1) dry-type transformers: rely on air convection cooling, generally used for local lighting, electronic circuits and other small-capacity transformers.      (2) oil-immersed transformers: rely on oil as a cooling medium, such as oil from the cold, oil-cooled air-cooled, oil-soaked water, forced oil circulation.      3, according to the use of points:     (1) power transformer: for the transmission and distribution system of the rise and fall voltage.      (2) instrument with transformers: such as voltage transformers, current transformers, for measuring instruments and relay protection devices.      (3) test transformer: to produce high pressure, the electrical equipment for high-pressure test.      (4) special transformers: such as electric furnace transformers, rectifier transformers, adjust the transformer and so on.      4, according to the winding form points:      (1) Double winding transformer: Used to connect two voltage levels in the power system.      (2) three-winding transformer: generally used in power system area substation, connecting three voltage levels.      (3) Autotransformer: Power system for connecting different voltages. Can also be used as a normal step-up or down transformer.      5, according to the core form points:      (1) core transformer: for high voltage power transformers.      (2) shell transformers: special transformers for high current, such as electric furnace transformers, welding transformers; or for electronic equipment and television, radio and other power transformers.
Q:Transformers, broken, how to repair
Some of the transformer buried inside an insurance, first look at the said
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 3-5 years out of a new product, the loss is also constantly in the drop. For these reasons, the transformer is less than 20-30 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 15164-1994. Transformer machinery industry standard GB / T 17468-1998 "power transformer selection guide" in Article 8 transformer thermal aging rate and life of the "transformer life is generally 20 years."
Q:What is the critical load of the economic operation of the transformer?
Transformer manufacturing and economic operation Transformer economic operation depends not only on the economic operation mode, but also depends on the transformer manufacturing level. According to the transformer often load can be divided into four cases: one is often at full load or close to full load operation of the transformer; the second is often running in most of the transformer; third is often running in a few half of the transformer; Load or no load operation of the transformer. The current factory factory transformer, the economic load factor is mostly 40 ~ 60% range, the above four types of load are not fully adapted, especially for full load or light load operation of the transformer loss rate is great. Therefore, the proposed production of four types of transformers, the economic load rates were 90%, 65%, 40%, 20%. Each unit can be based on the load of the transformer to select the appropriate economic load factor of the transformer. In this way, the power units of the transformer can run in the economic operation area, you can save a lot of active power and reactive power 5. 2 Transformer update and economic operation The purpose of the equipment update is simply not to eliminate its tangible wear, but also to eliminate its intangible wear. Only by constantly updating the way can we fundamentally reduce the equipment loss, improve efficiency, improve the technical backwardness. Update the transformer will inevitably bring active power and reactive power savings. But to increase investment, there is also a recovery period of the problem. Transformers are not damaged after the update, but aging to a certain extent, but also have a certain value when you can update. Transformer manufacturers of different types, different capacity of the transformer life are provided, generally 20 years. The use of units in accordance with the provisions of the years to extract depreciation equipment, and the transformer update
Q:800KVA transformer itself is the loss of how much?
S9 type oil change 800kVA Calculation results: no-load loss 1400 watts load load loss of 7500 watts. Calculation formula of transformer loss (1) active loss: ΔP = P0 + KTβ2PK ------- (1) (2) Reactive power loss: ΔQ = Q0 + KTβ2QK ------- (2) (3) Integrated power loss: ΔPZ = ΔP + KQΔQ ---- (3) Q0 ≈ I0% SN, QK ≈UK% SN Where: Q0 - no load reactive power loss (kvar) P0 - No load loss (kW) PK - rated load loss (kW) SN - transformer rated capacity (kVA) I0% - transformer no-load current percentage. UK% - short circuit voltage percentage Β - average load factor KT - load fluctuation loss coefficient QK - rated load leakage power (kvar) KQ - Reactive power equivalent (kW / kvar) Selection of the parameters of the above formula: (1) take KT = 1.05; (2) The reactive power equivalent KQ = 0.1kW / kvar when the 6kV ~ 10kV step-down transformer of the urban power grid and industrial enterprise power grid adopts the minimum load, (3) the average load factor of the transformer, for agricultural transformer desirable β = 20%; for industrial enterprises, the implementation of three shifts, desirable β = 75%; (4) transformer operating hours T = 8760h, the maximum load loss hours: t = 5500h. (5) transformer no-load loss P0, rated load loss PK, I0%, UK%, see the transformer signs shown.
Q:What is the transformer absorption ratio (R60 / R15)
Generally, the absorption ratio should be greater than or equal to 1.3 as the absorption ratio is acceptable.
Q:How to distinguish between large, medium and small transformers
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, high-frequency 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. Commonly used transformer classification can be summarized as follows: 1, according to the number of points: 1) single-phase transformer: for single-phase load and three-phase transformer group. 2) three-phase transformer: for three-phase system of the rise and fall voltage. 2, according to the cooling method points: 1) Dry-type transformers: rely on air convection for natural cooling or increase fan cooling, used for high-rise buildings, high-speed toll stations and local lighting, electronic circuits and other small-capacity transformers. 2) oil-immersed transformers: rely on oil as a cooling medium, such as oil from the cold, oil-cooled, cold water, forced oil circulation.
Q:Why the new operation of the transformer to be charged
New installation or overhaul after the transformer, have to carry out the explosion test, test the performance of the transformer. The general impact of 3 to 5 times, the first impact of transmission for about 15 minutes, after every 5 minutes each time the impact of a time, about 10 minutes each time.       1, test transformer insulation, mechanical strength can withstand the impact of working voltage and excitation inrush.       2, test whether the transformer differential protection can avoid the impact of inrush current.

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