40MVA/110KV generator startup/standby transformer

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Place of Origin: HeBeiBrand Name:


Model Number:




Phase: Coil Structure:


Coil Number:

3 Winding

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 40MVA/110KV generator startup/standby 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/110KV generator startup/standby 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/110KV generator startup/standby 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.


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Q:Are Current and Potential transformers used for Step purposes?
Transformers that are called current transformers and potential transformers are designed specifically for instrumentation purposes. They are designed to provide reduced current or voltage signals that very accurately represent the primary current or voltage. They are designed to have a minimal effect on the primary circuit. The are manufactured only in sizes needed for instrumentation purposes. Instrumentation purposes include not only providing signals to meters but providing signals to protective relays and control systems. CTs and PTs may occasionally be used for purposes other than the purposes for which they are designed. I have heard of a CT being used backwards to supply a high current at a very low voltage for some testing purpose. This sort of thing is sometimes done as a temporary measure when more appropriate devices are not available.
Q:transformers and why they heat?
Of course a transformer must use AC voltage and current. Power consumed is calculated as P EI (volts x current). Even if the transformer is not connected to a load current must pass through the coils of wire. Although the resistance of the wire coils is minimized (where thick copper wire has less resistance) to obtain the needed effect many turns are required and thick wire may not be practical. The transformer will exhibit a heating effect equal to its I2R (current squared x resistance) losses.
Q:How to make a current transformer more linear?
Ideal linearity is reached when B and H are linear. Use air as medium. It may give less output but linearity will be perfect!
Q:Which is good for the transformer?
JMBBZBJZ line lighting transformer, JBK machine control Transformer, SSG Servo Transformer, Low Voltage High Current Heating Transformer, SBW High Power Compensated Power Regulator, SBW-F Splitter Regulator, SVC High Precision Fully Automatic AC Voltage Regulator, Precision Clean Regulator, Microcomputer No Touch Point voltage regulator, UPS, EPS power supply, KSG mine transformers, DN resistance welding water-cooled transformers, reactors, contact-type automatic voltage regulator, column high-power electric voltage regulator,
Q:Will a 110V transformer work with a 100V contactor?
You ALSO need to be concerned with the POWER RATING. The bigger transformer is capable of handling more power (current) than the smaller one. Therefore, even though the VOLTAGES are correct, the smaller transformer will over heat and burn out, POSSIBLY CAUSING A FIRE! There should be a CURRENT RATING on the old transformer (like 5 amps or 10 watts), and you need to get a new transformer that has BOTH the same VOLTAGE AND CURRENT capabilities.
Q:Step down transformer of my refrigerator overheats, emits smoke and burns out?
You need to determine the actual load from your refrigerator, and compare it to the rating of the transformer. Most step-down transformers that one human being can carry without strain are rated at perhaps as much as 1,000 watts. Which is enough to handle the typical refrigerator while it is running, but not, perhaps, when it starts. A typical refrigerator uses between 700 and 1,100 watts, with a surge of between 1,400 and 2,200 watts when it starts. So if your transformer is marginal, and the unit is running more (summertime) or the door gasket is worn or anything similar, you could be overloading your transformer. You also state you have had it rewound - unless the rewinder uses the proper gauge wire, wrapping material and stabilzes the new windings with the correct varnish and epoxy, a rewind will not begin to last as long as the original. And if he/she shorted you a few coils, you will get the correct ratio - but not enough capacity. Just as a general rule-of-thumb, when it comes to motor-loads such as heavy appliances, if you need to use a step-up/down transformer, it should be rated at least at 200% of the steady-state load of the unit. 250% is better. Good luck with it.
Q:whats the history of transformers?
Yep, it replace into an 80's comic strip placed out with the help of way of the Hasbro company company company,(who additionally advertised the everyday GI Joe toys and cartoons). The exhibits have been long working commercials for the ever evolving line of toys. The Transformers have been the form till Hasbro have been given right here out with the previous Transformers action image (anime) which pissed each and all the fams off by using fact of certainty they killed off Optimus precise and then dwindled the numerous characters into obscurity with the objective to sell their new line of robots. you will are available the process most of the previous episodes on youtube.
Q:how to get exact output voltage from step down transformer?
This is typical of smaller transformers. They are not very efficient, and so the output voltage changes with changes in load. They are specified for voltage at the full load, so with a light load the voltage is higher. Of course the output voltage also depends on the input voltage with a transformer, and there can be measurement issues with non sinusoidal waveforms. Usually a DC supply in an appliance or device (if that is your purpose) is designed so it can accommodate the full expected range of input AC voltages. This often involves a DC regulator applied to the unregulated DC output. This leads to a DC supply with a specified range of AC input voltages. You will need to consider the range of voltages your appliance can use. This is not always specified, but it may be shown as a maximum and minimum AC voltage allowed. With more information about your circuit it should be possible to determine the maximum and minimum input voltages required. There are ways to change this to suit your transformer if the appliance circuit is known. Ways to reduce the AC voltage: Increase the load on the transformer, perhaps with a suitable lamp or heater. The total load (watts) must be less than the transformer power ratings. Near full load the voltage will be more like the specified voltage for the transformer. This assumes the normal load is much less than the transformer power rating, which is when the voltage is high. If the load varies, this method is not ideal and it wastes power. Use a second transformer or variac to adjust the AC input to the transformer. This only works if the transformer is used with a small load. This will work best with a fixed load current, and is bulky and expensive. Get a different transformer specified to supply the correct voltage at the current you are using. If the current varies widely this is not a suitable method.
Q:Where can i find this transformer?
Unless okorder
Q:why the low voltage winding is wound at first in a 3 phase core type transformer?
The low voltage side is usually the output side. So putting the secondary windings closer to the core will insure the maximum amount of flux passes through the secondary windings.

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