250MVA/242kV three phase combined shell type transformer for hydro power station

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Loading Port:: Tianjin

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Min Order Qty:: 1 pc

Supply Capability:: 1 pc/month

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Quick Details

Place of Origin:	HeBei	Brand Name:	CNBM	Model Number:
Usage:	Power	Phase:	three	Coil Structure:	Toroidal
Coil Number:		Capacity:		Rated Voltage:	250MVA/242kV
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 250MVA/242kV three phase combined shell type transformer for 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 250MVA/242kV three phase combined shell type transformer for 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 250MVA/242kV three phase combined shell type transformer for 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.

Q:hi can anyone tell me when installing/replacing a door bell transformer when switching off power supply at main source will that make it safe to work with the connections, it keeps telling us to turn fuses off well it dont have fuses its a circuit breaker. so do we turn circuit breaker off asweel as main supply into house. may be a silly question to ask but dont wnat any trips to A nad E lol thanks guys xxx: Friedland Transformer

Q:From the following transformer, how would I calculate:a) the equivalent impedance on the low-voltage sideb) Converting the impedance found in (a) to it's per-unit quantities: a) the turns ratio of the transformer is 20 to1 so to refer an HV side impedance to the LV side you divide it by the square of the turns ratio which in this case is 400 which gives: 0.001+j0.00025 ohms. b) There's a certain amount of freedom in doing this for you may define the per-unit impedance base however you want. It is however rather usual to define it as VA / I^2. Here I 5000/2400 2.083 amps So base impedance HV side 5000/2.83? 624 ohms making the given impedance (0.4+j0.1)/624 p.u. This p.u. value should be the same on either side of the transformer. Nice to see you around again but do I notice you haven't improved at saying please when you want someone to do something for you for nothing. If you can't learn that there's not much use in learning all these technical skills. You're going to remain a clumsy oaf!

Q:If the primary circuit of a transformer is connected to a power source and the secondary circuit has a light bulb, will the light bulb turn on and stay on when the power source is turned on? Or will it turn on for a few seconds and then turn off?This question's been bugging me because I think because transformers are usually wired through AC that the bulb would only turn on for a few seconds and then turn off, but then shouldn't current be constantly flowing so it would stay on?Thanks for and clarifications.: Umm, is the power source AC or DC? You are right, transformers usually use AC. Is it not using AC in this example? You didn't say. If it's using AC, the light bulb will stay on. The current actually switches on and off, but so fast you don't see it. Well, normally, for household 60Hz AC power. But who knows with this mystery power source. It could be 1Hz AC. If it's using DC, then it will come on for a short time (a few seconds? I don't know). Yes, current is continually flowing through the primary circuit, but after a while no current will be flowing through the secondary circuit where the light bulb is connected. It takes change in current in the primary circuit to induce a current in the secondary circuit.

Q:I use a 1000 watt transformer for my tv, dvd player, cd player, game cube and nintendo (only 2 can be plugged in at a time or it is a fire hazard). The transformer is very strong and flips the circuit breaker if anything else in the house is plugged in and I try to plug that in. I'd rather not have to unplug everything to plug it in but I am worried I am wasting electricity if I keep it plugged in. So my question is does transformers use energy if they are plugged in and the appliances plugged into it aren't turned on? Also, do you think I can use a smaller transformer for those items listed above if it does use energy? The boxes that I buy them in don't say, they just say what watt they are.I've tried to look it up but I can't understand any of it so thank you in advance for helping me.: Yes they use electricity

Q:How many times does a copper wire have to go around the input side of a transformer to get the necessary amount of magnetism from 110 volts?How thick does the wire around the transformer have to be if the input it 110 volts? Can it be one wire as thin as a garbage bag tie, or does it need to be as thick as the original wire, but stripped and coiled around the transformer core?: As stated in another answer, the basic transformer equation is: E 4.44 X f X N X Ac X B E is the applied RMS voltage f is the frequency (Hz) N is the number of turns Ac is the core area (square meters) B is the maximum flux density (Webers per square meter also kknown as Teslas) If the design is for 120 volts at 60 Hz and 1 Tesla, the required number of turns would be about 0.5 divided by the core area. PS The voltage has nothing to do with the thickness of the wire. Wire thickness is determined by current, the desired internal voltage drop in the wire resistance and the tolerable temperature due to internal losses. Magnet wire is used. It has very thin insulation to use the minimum space and allow heat to be more easily conducted out of the coil. The wire can not be stripped bare.

Q:I'm a beginner in electronics ,I have a big , old transformer (I think it is AC) , only supplies + current. (36 Volts)I also need - current to drive an amplifier.So i think it's an AC to DC converter i need. (It's just a guess , i don't really know.)How can i achieve this ?Note : If you need additional details , please include how i can get that detail , just in case i don't know.: Transformers do NOT supply only + current, which I assume you mean as positive voltage, DC. So this is a power supply, not a transformer. Yes, you need an additional 36 volts DC power supply, and you would connect it as a negative supply, ie, connect the + output to your common or ground, and the – output would then be –36 volts for your amplifier. As to how, buy one or make one. Search google for 36 volt power supply. You will need to know the current requirements also.

Q:Go transformers: I have to go for Transformers. Being totally unbiased - never been a fan of Spidey or Transformers, I was awestruck by Transformers. Spiderman 3 was good too - but failed as a total packaged. It was too long and I was aware that it was too long and that's the reason it lost me (unlike Pirates 3 -which was long too but it kept me interested - but Pirates 3 is not part of this question) Yeah! Go Transformers!

Q:Can an efficient transformer step up energy?: A transformer is used to change the voltage in an electric circuit. The power that enters the transformer is P(entrance)U(e)i(e) (1) the power that leaves it being P(exit)u(exit)I(exit) In general P(exit)P(entrance) and you can define the efficiency of the transformer as [P(entrance)-P(exit)]/P(entrance). Is that what you wanted to know.

Q:"A transformer ratio is 110/11, then it is" "A transformer ratio of 110 / 10.5, it is" "A transformer ratio of 121 / 10.5, it is": For example, 10KV system, the transformer primary winding rated voltage of 10KV and 10,5KV, secondary winding rated voltage of 10.5 and 11KV. 110KV system, the transformer primary winding rated voltage of 110KV, secondary winding rated voltage of 121KV. 220KV system, the transformer primary winding rated voltage of 220KV, secondary winding rated voltage of 242KV. and many more. 110KV is a winding, that is, 110 variable 10.5KV course is the buck variable. Secondary winding for the 121KV, that is, 10.5 variable 121KV course, the pressure has changed.

Q:i have fuses and everything that i can use to test my primary but should i add more turns on the primary side? yes i know line voltage is dangerous. yes i have worked with it before and know how to work around it.: More information needed. I guess you are in the USA with 115 volts AC and 60Hz. For a given size (cross section) of core and mains frequency there is a turns per volt although special alloys like Radiometal upset things as everything gets to be about twice as powerful as standard transformer iron. If you can thread a few turns through the core you will be able to measure the voltage and thereby deduce the turns-per-volt. I 'd suggest that you leave the primary as it is and just rewind the secondary. As to your flyback circuit, you would probably be better off making a fixed frequency oscillator (555 timer?) and using it to drive the power stage. As to wire size on coils, a very old rule of thumb used to be 2000 amps per square inch of copper. 5 amps therefore needs 1/400th of a square inch. Possibly you may end up with more than one wire size that will suit. Mullard used to do some excellent designers guides books in the 1960s but unfortunately I can't put my hand on them at the moment. Good luck!

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