260MVA/800kV single phase water cooling main transformer for the hydro power station

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Place of Origin: HeBeiBrand Name:


Model Number:




Phase: singleCoil Structure:


Coil Number: Capacity: Rated Voltage:


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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 260MVA/800kV single 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 260MVA/800kV single 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 260MVA/800kV single 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 vacuum impregnation of the transformer?
so that the transformer immersed in vacuum under the conditions of the paint, so you can rule out the bubble inside the winding, increase Insulation performance. Dip out after drying.
Q:How is the transformer sorted?
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.
Q:Three-phase transformer how to calculate the current, ah, the formula is?
Calculation formula and empirical formula of transformer secondary current Three-phase transformer current calculation formula I = S / (root number 3 * U), where U is the transformer line voltage, KV Transformer Current Experience Port Algorithm: Primary Current I ≈ S * 0.06 Secondary Current I ≈ S * 1.5 For example: a 500KVA transformer to calculate the current and secondary current, with the current formula I = S / (root 3 * U) I = 500 / root 3 * 10 = 500 / 17.32 ≈ 28.8AI = 500 / root 3 * 0.4 = 500 / 0.69 = 724.6A with the transformer current experience calculation formula: I = 500 * 0.06 ≈ 30A I = 500 * 1.5 = 750A Transformer operating load requirements For example: a 800KVA10 / 0.4KV transformer, according to the first and second current calculation, a variety of load current is how much? Solution: Primary current I = S * 0.06 = 800 * 0.06 = 48A Secondary current I = S * 1.5 = 800 * 1.5 = 1200A Low load: Primary current I = 48 * 15% = 7.2A Secondary current I = 1200 * 15% = 180A Reasonable load: primary current I = 48 * 50% = 24A Secondary current I = 1200 * 50% = 600A Full load: primary current I = 48 * 75% = 12A Secondary current I = 1200 * 75% = 900A
Q:Transformer copper row selection
Answer: no love language, all the text is boring.
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.
Q:Will the installation of transformers, power supply bureau is how the charges?
Peak valley price, one day divided into several periods. Each local price is different, the specific local electricity price can call 95598 advice
Q:What is the rated current of the 80KVA transformer?
Rated current calculation of transformer Primary side approximation 0.058 * KVA (transformer capacity, size 10kV / 0.4kV) Secondary side approximation 1.44 * KVA (transformer capacity, size 10kV / 0.4kV) Known transformer capacity, and its voltage level side rated current Formula a: Capacity divided by the voltage value, the business by six divided by ten. Description: Applies to any voltage level. Unit KV 80KVA transformer low voltage rated current is: 80 * 1.44 = 115.2A
Q:How much capacity the transformer has
According to GB / T6451- "three-phase oil-immersed power transformer technical parameters and requirements", the voltage level 10kV-220kV, the capacity is as follows (kVA): 30,50,300,123,80,100,125,160,200,250,315,400,500,630,800,1000,1250,1600,2000,2500,3150,4000,5000,6300,8000,10000, Lt; / RTI & gt;
Q:Transformer 1KVA can load how much security, how to calculate the formula
This is based on the voltage count, such as three-phase 380V. 1KVA current is basically 1.5A
Q:What is the difference between the inverter and the transformer?
★ 1, [inverter]: inverter can change the frequency, [also change the voltage accordingly]. Because, inductive (such as motor) load, in the frequency down, the sense of resistance is also reduced, in order to prevent the current exceeds the rated value, must also reduce the voltage! In the last century just introduced, for the FM, voltage regulator, speed control device is known as the "three V technology" is the reason. - ★ 2, [Transformer]: As the name suggests, the transformer is to change the voltage of the device. Transformers are typically used at specific frequencies (eg, frequency, or high frequency). As the voltage used to change, the frequency is constant, which is its salient features.

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