840MVA/550kV three phase water cooling main transformer for the hydro power station

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Quick Details

Place of Origin: HeBeiBrand Name:

CNBM

Model Number:

 

Usage:

Power

Phase: threeCoil Structure:

Toroidal

Coil Number: Capacity: Rated Voltage:

840MVA/550kV

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

 

 Description

 

The application of the 840MVA/550kV three phase water cooling main transformer for the 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 840MVA/550kV three phase water cooling main transformer for the 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 840MVA/550kV three phase water cooling main transformer for the 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:What is the difference between the main transformer and the transformer used?
1, the so-called main transformer or (plant) with transformers are transformers, but according to their use of different names. The so-called main transformer: generally in the power plant or substation are so called, its function is for the system through the required level of power transformer; the so-called (factory) with the transformer is inside (power plant interior) Electrical equipment to provide power transformer. 2, the (plant) with the transformer power supply connected to the main transformer on the same bus, and some received another external power supply, so that when the main transformer can be maintained when the maintenance (plant) to continue to have power!
Q:How is the transformer sorted?
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. 3, according to the use of points: 1) power transformers: for power 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, capacitive transformers, phase-shifting transformers.
Q:Three - winding transformer winding problem
2, from the manufacturing cost considerations, the transformer core is grounded. Low voltage coil inside, the coil on the core of the insulation distance can be smaller. So that the sum of the main insulation dimensions of the three coils will be smaller. The weight of the entire transformer, the volume is relatively lower than the - low - high arrangement to be smaller.
Q:Is the transformer output DC or AC?
There is also a direct communication, depending on what is the use of what. For example: for power distribution with the step-down transformer input and output are AC; and electronic circuit transformer is a double winding or multi-winding transformer, mostly safety transformer, the output is DC; China's auto-transformer is AC transformer The Autotransformers are not allowed to be used as safety transformers. So the output for the exchange.
Q:Transformer short-circuit impedance is big good, or small good? The same capacity, voltage ... solution
Transformer rated current / short circuit impedance = transformer short-circuit current 6% short-circuit current is small, and 4% not much difference, personal point of view! Nothing can look at Guo Weiguo teacher answered the question, will certainly benefit from the.
Q:Single-phase and three-phase transformer is what it means
Input and output are single-phase AC is the single-phase transformer. Input and output are three-phase symmetrical AC is the three-phase transformer.
Q:Rules for the operation of cooling devices for oil - cooled transformers
A, cooler should take their own independent dual power supply, and can automatically switch, when the work of power failure, automatically put into standby power, and issued a sound signal;  B, the transformer upper oil temperature reaches 55 ℃ or the current reaches 70% of the rated value, the auxiliary cooler automatically input;
Q:Why the computer water does not use transformer oil
In terms of cooling medium, the cooling effect of water is very good, it is used in the weak is the most used to achieve the purpose of cooling and the lowest operating costs.
Q:10 (6) /0.4kv three-phase transformer what does it mean
Therefore, the decision to 60 and 35kV winding connection to be careful when the connection must meet the transmission system voltage phasor requirements. The connection between 60 and 35kV windings is determined according to the relative relationship of the voltage phasors. Otherwise, even if the capacity of the voltage ratio is also right, the transformer can not be used, connected wrong, the transformer can not be connected with the transmission system. 3). Domestic 10,6,3 and 0.4kV transmission and distribution system phase also has two phases. In the Shanghai area, there is a 10kV and 110kV transmission system voltage phase difference of 60 ° electrical angle, this time can be used 110/35 / 10kV voltage ratio and YN, yn0, y10 connection three-phase three-winding power transformer, but limited Three-phase three-core core. 4). But note that: single-phase transformer in the combination of three-phase group connection, can not use YNy0 connected three-phase group. Three-phase shell-type transformer can not use YNy0 connection.
Q:What is the reactive power compensation of the transformer?
Transformer reactive power compensation is to compensate for the transformer to form the power required by the electromagnetic field, the reason why called reactive power, because it is only exchanged, not consumed. Reactive and active in fact have the same physical properties, in the transmission and use of the process is not part of what is active, that part is reactive. But they are different, there must be other forms of power to be able to transform, no power is not needed.

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