40MVA/220KV startup/standby OLTC transformer

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Loading Port:: Tianjin

Payment Terms:: TT OR LC

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:		Coil Structure:	Toroidal
Coil Number:	3 Winding	Capacity:		Rated Voltage:	40MVA/220KV
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 40MVA/220KV startup/standby OLTC transformer, 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 200-490 tons, and due to the restricted transport conditions, the transportation becomes the critical issue for application of the 40MVA/220KV startup/standby OLTC transformer. 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 OLTC transformer 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 OLTCTransformer’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 40MVA/220KV startup/standby OLTC transformer, 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 UHV construction application in our country, greatly improved the technical level and manufacturing ability of BTW in terms of OLTC Transformer products.

Q:Guys can you tell me that how can I calculate transformer winding?Example:- I need (12volts, 4Amps, 50Hz on Secondary's side of transformer and give 230volts 50Hz on Primary's side of transformer) how I calculate the wire's number of turns? In this case I can give different values of current like 1Amp, 2Amps, 3Amps etc on Primary's side of transformer. But I need constant 12volts, 4Amps, 50Hz on secondary. So how can I calculate.Please give an answer with an example basis on (0-12) transformer.: As others said, only worry about the voltage ratio. That determines the turns ratio. Current doesn't enter in to this equation yet. The minimum number of turns on the primary is dictated by two things, the saturation flux density and magnetizing inductance. Flux density is proportional to the applied voltage, inversely proportional to frequency and effective area of the core. You'll need to know the saturation limits for the core you are using. You also need to have a minimum numbers of turns to minimize the no-load current which relates to magnetizing inductance. My rule of thumb is the inductive reactance must be 5x the maximum expected load resistance, however, for a AC mains transformer, this is often a hard number to quantify since the load can be near zero. Next is wire size. You will need to consider proximity effect losses as well as DC losses. You'll find that there is an optimum wire size for the windings, but for a 50Hz transformer, you'll probably use a wire diameter smaller than optimal for a low power transformer. I suggest reading about this in Ferrites for Inductors and Transformers by Snelling and Giles. You may need to make compromises to meet your needs. This is where the current supplied by the transformer comes in to play, maximum heat loss expected. While making your own transformer is educational, for power mains transformers, you are better off buying one or scrapping it from an old piece of equipment.

Q:I have 13 lights with 12 volts 35 Watts on each light for each tree, the outlet is 120 volts current now. Should I buy 300Watt or 600Watt low volts transformer to supply all lights? Need your advise!: The minimum transformer you need, with 80 percent safety factor, and internal inefficiency, is 500 W, so get the larger one.

Q:I understand that transformers used to lower voltage for AC power transmission, simultaneously change both the voltage and current, but if such a transformer were in used in say a 12 volt dc power adapter that plugged into the wall outlet, then it would be counterproductive if the voltage lowering transformer upped the current as too much power would be dissipated, and a current boost would be unwanted, right? Same with transformer for PC power supplies. They must lower voltage without upping the current, right? Thanks a lot.: You have a major misconception. The amount of current out of a transformer is determined by the load. The transformer sets the MAXIMUM current available, but the actual current is determined by the load placed on the transformer. So if you plug a transformer into 120 VAC to get 5 volts AC for a PC, even though the 120 volt AC outlet is rated at 20 amps, that does not mean you get 20*60 amps out of the transformer. The maximum current out of the transformer in the above example is set by the rating on the transformer, say 10 amps, not 1200 amps. And the actual current that flows out of the transformer is determined by the load. Open circuit, it is zero. Connected to its load, it could be 5 amps. And this is where the current ratio comes into play. that 5 amps causes 5/60 or 0.083 amps in the primary. to elaborate further, a 12 volt battery has a 100 amp capability. That means the battery can put out UP TO 100 amps. But the actual current drawn by the battery depends on the load.

Q:Do you really think Transformer 2 is any better than Paul Zart Mall Cop? Not that Mall Cop was a good movie. Transformer 2 just went on and on, boring, boring.: transformers 2

Q:does anybody know what Transformers 2: Revenge of the Fallen is going to be about? Like what is the whole plot, or storyline?: The battle for Earth has ended but the battle for the universe has just begun. After returning to Cybertron, Starscream assumes command of the Decepticons, and has decided to return to Earth with force. The Autobots believing that peace was possible finds out that Megatron's dead body has been stolen from the US Military by Skorpinox and revives him using his own spark. Now Megatron is back seeking revenge and with Starscream and more Decepticon reinforcements on the way, the Autobots with reinforcements of their own, may have more to deal with then meets the eye. I'd take that with a pinch of salt though as it's probably fan invented.

Q:Hey I was just wondering if the Nintendo DS version of the Transformers:Revenge of The Fallen game still had the Create-A-bot feature where you can customize your own transformer or if you had to play as the movie characters?: Well, it sort-of has a create a bot feature, but not quite. In the beginning of the game, when you get your transformer as a protoform and once you get to do actual missions, you get to choose out of only three types of vehicles: A light but fast car, an all evened out sports car, or a heavy armoured tank (sort of like another game). However, you can only chose one because you are stuck with that form for the rest of the game. HOWEVER,with energon you pick up fighting other enemies and scanning computers or machines, you can customize stats (attack, agility, defence, ranged attacks, health, and regeneration of health) an customize your robot with different weapons. The game is not a wander-around game like its predecessor, but challenges are available. I guess after you beat the game or when going throughout levels, you play as transformers such as Starscream (beginning of Decepticons) or Optimus Prime (beginning of Autobots).

Q:I have been reading wikipedia and have gotten confused.Va.Number of Coils on side a---- ._________________Vb.Number of Coils on side bwikipedia mentioned how power companys use transformers for converting to high voltage power li nes then use transformers to bring the voltage back down.Focusing on the transformer that jacks the voltage upwirea-[side a-Transformerxyz- side b]-wirebso assum wireb is the high voltage power line.--Which side of transformerxyz would have more coils ? My guess is that side b has more coils then side a--Is it safe to say that the wattage of side a is equal to side b?--they said something about magnetic flux, does this just mean that the material connecting side a to side b has to be magnetic?--they said that the insulation wears down in transformers over time due to heat. what is causing this heat?--they said something about leakage and spacing of coils, what does this mean?tyVVVVVVVm: The previous answer is correct, but the following may be helpful. A transformer works by the linking of changing magnetic flux produced by one loop or coil (the primary winding) with another coil (the secondary). That is why transformers only work with alternating current or pulses. Magnetic iron has the ability to increase the magnetic flux produced by a coil. This is called its magnetic permeability and can increase the flux produced by factors of several thousand or more. Leakage flux in a real transformer is the amount of flux produced by the primary that does not link the secondary. This flux is wasted and reduces the efficiency of the transformer. Heating of the wire insulaltion not only comes from the resistive heat of the windings, but also the heat produced in the magnetic material (core) of the transformer. These losses are called eddy current and hysteresis losses and can be quite substantial. The reason that cores of transformers are laminated (stacked thin sheets of magnetic iron) is to reduce the eddy current losses.

Q:Transformer total circuit breaker rated current 380v, rated current 1000a, the rated capacity and output power how to calculate, I did not learn more points: KVA is apparent power, kW is active power. inspecting power: S = 1.732UI = 1.732 x 0.38 x 1000 ≈ 658 (kVA) Active power: P = 1.732UI cosφ = 1.732 × 0.38 × 100 × 0.8 ≈ 526 (kW) AC power, power divided into three kinds of power, active power P, reactive power Q and apparent power S, at any time these three power always exist at the same time. ????? The cosine of the phase difference (Φ) between the voltage and the current is called the power factor, denoted by the symbol cosΦ, where the power factor is the ratio of the active power to the apparent power, that is, cosΦ = P / S ????? Three power and power factors cosΦ is a right-angle power triangular relationship: two right-angled edges are active power P, reactive power Q, and oblique edge is apparent power S. ????? S? = P? + Q? S = √ (P? + Q?) ????? Apparent power S = 1.732UI ????? Active power P = 1.732UIcosΦ ????? Reactive power Q = 1.732UIsinΦ ?? ????? DC = P = UI = U? / R = I?R

Q:How can we figure out which side of transformer is primary which one is secondary by measuring resistance ? I know that the side where input or supply is provided called primary from where the output is collected is called secondary side in both step-up step down transformersAnd, how can we troubleshoot a bad or a good transformer by measuring its resistance on both sides i.e. primary side secondary side ?thanks: I agree with Billruss. Some digital ohmmeters have a resolution as low as 0.01 ohm which is typically less than the resistance of most windings on small and medium size transformers. The ohmmeter is useful to identify which leads go with which windings some transformers have several windings. Typically you can connect 1 volt to 6 volts ac to one of the medium resistance windings. Then measure the voltage on each of the other windings. This determines the turns ratio on a good transformer. Applying the low voltage to a different winding will show close to the same turns ratio, unless the transformer is defective. Neil

Q:Electrical Machinery, Electric Machines, 3-phase transformers: Generally if you see three single phase transformers all mounted on one pole( not sure what a hydro pole is?), they are connected to supply three phase service to the customer. Not usually three single phase services, at least in the USA. The three single phase transformers may supply 208Y/120 volt 4 wire three phase, 120/240 volt 4 wire three phase (usually one of the transformers in this configuration is larger than the other two), 240 volt three wire delta or 480 volt delta, or a 480/277 volt 4 wire service., And on and on. This is determined by the voltage ratios of the transformers used and what the local utility supplies as a normal service voltage. Hope this helps, Newton1Law

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