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:


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 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:630 kilovolt transformer secondary side of the current is how much
630kVA that his rated capacity, it is ideal to say that with the load of 630kW (but actually can not bring so much) Rated current calculation formula: rated current = capacity / rated voltage / root number 3 (for 3-phase transformer) 630 / 0.4 / 1.732 = 909.3 A Pure hand to play, hope to adopt ~
Q:About transformers, can any type of transformer lower voltage without simultaneously raising current??
For a perfectly efficient (100% efficiency) transformer, [Power before transforming] [Power after transforming] That is V1 I1 V2 I2 Therefore, it DOES up the current when lowering the voltage. However, for a transformer that is not 100% efficient: [Power before transforming] [efficiency in %age]/100) × [Power after transforming] Therefore, for a non-efficient transformer, it is theoretically possible to lower the voltage without upping current. For example for a 50% efficient transformer thet converts 220 V ac at 20A to 110 V: 220 × 20 (50/100) × 110 × x Solve for x: x 20A
Q:More on transformers storyWhere to turn?
It started as an animated series in the 80s. Check out youtube for some clips.
Q:Am I overloading this electrical transformer?
From your readings ,the transformer is within it's rating. Power Transformers are usually rated to operate at 75 Deg. C and above. Sometimes up to 95 Deg. C. The data and limit will be on the nameplate. 75 Deg. C is uncomfortably hot. 95 Deg. C. will burn you. Note; SCR dimmers WILL produce harmonic currents that will increase the 'neutral load' well above 'phase load' on 'common neutral' circuits, and might be producing some high frequency heating in that T/F.
Q:Transformers 2 disappointment?
Same way, but for different reasons. There WAS acting, but it was over-acting. About a thousand times more than the first one. And now it's not just the pitiful human actors (namely Sam's new roommate, and again his parents) doing the over-acting, but the Transformers themselves: little former radio-controlled truck, Wheelie, somehow inherently born a Decepticon for no reason at all who talks smack at every chance. The Autobot twins, Skidz and Mudflap, no explanation needed. And the story was ridiculous. It was as if they had three or four plots and screenplays in front of them, then diced them up, tossed 'em in a hat and shook 'em vigorously, then glued it all back together in one heaping mess. As for action, that's what I showed up for. And ironically didn't feel there was enough of. They advertised an action-packed summer thriller with suspense and destruction, and instead they crapped out a comedy. Nice job, Bay. Now go away.
Q:Is It Bad to Live Above a Transformer?
Transformers can produce powerful electromagnetic fields, but there is no definitive answer on the safety of living next to transformers. Some people believe the electromagnetic fields cause health problems, and others do not. Bona fide research on health risks has produced sometimes contradictory results. One thing is for sure, high capacity transformers occasionally explode if they get overloaded, but these types of transformers are not allowed inside of buildings.
Q:Can the transformer be replaced with a component?
If you say the transformer is a small power frequency transformer, then you can use switching power supply instead. If the substation with high-power transformers, there is no thing to replace.
Q:S11-1250kVA transformer oil capacity how much
The total amount of oil in the transformer: the amount of oil supplied by the transformer body transport + (the amount of oil required to be added to the main body) + (the amount of oil added to the oil conservator) + (transformer accessories - such as the amount of oil required for the radiator )Wait. The amount of oil added in parentheses is the transformer factory, and the oil drum is installed and delivered to the customer. So customers receive the transformer, the transformer should be the total amount of oil is acceptable enough
Q:Confused with transformer.?
It looks like you MAY have an auto-transformer, ie only one winding. Off hand, I would say the white is supply live and blue the common return. If you measure the DC resistance of White to all the others and record reading. Then red to all others as above and same with brown, yellow and blue. The pair with highest reading Should be the primary, it doesn't really matter which is live or neutral, as long as you take the return of the secondary to the neutral. The other 3 wires will give you 3 different voltages with respect to neutral, however the EHT in the serial No. May indicate Extra High Voltage, which is not 220v. by any stretch of the imagination. Is there no information whatsoever on the transformer itself? Clear as MUD I know, but I'm not good at explaining things. Your meter should be at the lowest range, as this is DC resistance you are measuring, not AC.
Q:Transformers 2 Premiere?
I think so.

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