What type of a transformer is a " class A " voltage transformer ?
445519
Class A transformers include the following:\nHigh and low voltage Switch gears,voltage and current monitors,voltage regulators ,stabilizers and detectors,voltage insulators,controllers , calibrators.\nRefer to Alfa Transformers limited, Gogate eletro systems, and Neel Industrial systems.
448145
Transformers do not store energy, that would be a battery or a capacitor.  Transformers work by wrapping wire around an iron core that is basically a circle.  For each wrap of the wire on the input side, you divide the total number of wraps into the voltage. If the input is 120 volts, and you have ten wraps, you get 12 volts per wrap.  Then, on the output side, you get an equivalent voltage per wrap.  So, that means on the example I gave, if you have five wraps on the output side you get 60 volts.  (5 x 12 volts = 60) This example would be a step down transformer, because you have a lower voltage than you started with.  If you have 20 wraps on the output side, you would get 240 volts. (20 x 12 volts = 240)  This is a step up transformer.  Note: Using Ohm's Law, you do not actually increase the total amount of power available, only change it's configuration.  Thank you, Nikola Tesla, inventor extraordinaire.
811233
For all steam and gas turbine... you need a circuit breaker. But it is only the matter of designing before or after the transformer and how safe you want to the system to be
118325
An isolation transformer is a one to one ratio transformer which is used to isolate equipment from the main power supply.  An isolation transformer provides a physical barrier between the primary winding and the secondary winding.  In single phase applications, this is often used for safety reasons (limiting available fault current, etc).  In three phase applications, this can also be used for power quality reasons (triplen harmonic mitigation), or to change winding configuration from delta to wye, wye to delta, etc.
549357
They consist primarily of enormous transformers which 'step' up the voltage to an excess of 100,000 volts (sometimes to over 1,000,000 volts).  Doing this results in a greatly reduced current required to transmit the same amount of power over a distance of wire, allowing for thinner wires to be used without risk of burnout.\n\nAt the receiving end, 'step-down' transformers reduce the voltage down to the 1,000 volt range for distribution throughout a community.  This is eventually stepped down to 230 volts for most residential areas.
996460
you'll need an adapter...different types of electricity
880689
Buck-Boost transformers are single phase, four winding transformers designed for two purposes. The first purpose is as a low voltage isolation transformer for use on 12, 16, 24, 32, or 48 colt circuits. When used as low voltage transformers, Buck-Boost transformers have capacities of .050 kVA to 5.0 kVA. Their second, and more important use, is as a "Buck-Boost" transformer. Buck-Boost means that these transformers are used to buk (lower) ro boost (increase) line voltage to match required load voltage. \n\nBuck-Boost transformers are used to correct consistently low or high voltage conditions, where the voltage difference ranges from approximately 5% to 27%. Variation of the input voltage is passed through to the output side of the transformer in the same percentage. This concept is important because the question is frequently asked if Buck-Boost transformers will stabilize variable voltages. They will not!\n\nBuck-Boost transformers are simple and straigt forward to specify, size and connect. Buck-Boost connections are achieved by interconnecting the 8 copper lead wires supplied with each transformer in accordance with the cahrtts contained in this section. In addition eah transformer shipped from the factory is equipped with a simialar chard to assure ease of use at the installations site.\n\nWhen connected as an autotransformer, they can handle loads up to 20 times the nameplate rating. A buck-boost transformer is the ideal solution for changing line voltage by small amounts.
182983
In simple terms a transformer basically consists of inductances and not resistances . Also due to the concept of magnetic flux linkage coming into picture , ohms law cannot be used in transformers
903909
A step down TXFMR can certainly be used as a step up. However, generally step up transformers are Dy and step down are Yd. By using a Yd transformer as a step up there will be no ground fault protection on the line.... so if there is a ground fault on any phase only, circuit interruption will not occur. If the circuit is a cable, a ground fault rarely occurs without it affecting at least two of the phases, thereby  becoming an overcurrent fault and either will blow the fuses or trip the CB at the transmission end feeding the fault.\nI would recommend that you install a grounding transformer on the step up end to ensure that the line has ground fault protection.\n\nSource: Electrical Engineer (ret.) with 45yrs+ experience
1132650
Responses without sources aren't answers, just opinions.\n\nA higher frequency results in a smaller lighter transformer (hence usually less expensive) for the same capacity.\n\nTo indiantrumpet: nice to see that you posted a verifiable source.
700927
The best publication and industry engineering guide is \n"The J&P Transformer Book" available through most on line bookstores. It is pricy by is the best text book on transformers\nSource: Electrical Engineer (ret) with 45+ yrs experience
85692
They aren't always a factor of 11, just the electrical systems in residences are the range you stated but there are 480v, 208, etc.  It isn't for any particular reason that i know of although i'm sure when they adopted the system they had their reasoning, but it has nothing to do with the number of 11.  Just the reason they use 120/240 is that you can just use a 2 box circuit breaker to get your 240 without requiring a transformer (expensive) and NEC requirements for that one that would make the cost much more expensive
855117
It appears you are speaking of apparent power. \nTransformers are rated in VA (volt X amps) called apparent power. \nIn a DC circuit power is determined by multiplying voltage X current (E X I = P). In an AC circuit power is determined the same way only when voltage and current are in phase with each other which means they are rising and falling falling at the same time. \nWhen they rise and fall at slightlly different times the time difference is known as a phase angle and the cosine of this angle is also applied to the E X I =P formula making it E X I X the cosine of the angle. This formula is used to determines the TRUE POWER of the AC circuit or any transformer circuit. \nTo sum it up, the APPAREMT POWER is always volts X amps. The TRUE POWER is always VOLTS X AMPS X the cosine of the angle. \nThe angle becomes larger when inductors, motors and capacitance are part of the load circuit.
1168894
there are 2 types of transformers-1)step-up and 2)step-down.step up transformer increases the voltage& dec. the current & a step down transformer dec. the voltage & inc. the current...by now u might hv gussed ..yep...a transformer is used to inc. or dec. current which is distributed to diff. houses & factories acc. to the requirement.
199156
In this answer I am going to refer you to an online calculator. The power company is simply trying to get an idea of your power requirements to establish a transformer and feeder size for your home. I will also tell you in this article va is the same as wattage. You will need to know the square footage of the home , whether you have gas or electric range and dryer , small appliance and laundry circuits are a given in all homes. 2-small appliance and 1 laundry . Also needed air conditioning load if applicable , or heat pump if applicable etc. If you have a copy of the National Electrical code available to you there is a sample house load section for single family dwellings that will  be helpful. But I truly feel for your purposes the following site will give you everything with a simple fill in the blanks format. If you have any questions Ill be happy to help. Ok heres the url for the calculator.  http://www.electricalknowledge.com/SFDLoadCalc.asp
759917
To give an example, a transformer could be a voltage amplifier, but the power would remain constant.  A power amplifier may or may not change the voltage, but increases the amount of overall power.  As you can imagine, the input and output impedances must be properly matched for all these examples.
564411
This company is in Mumbai. The one they show is for 180-260V, but it says you can change the range. They don't give prices, however ...\n\nhttp://www.voltamp.com/Products/cvt-constant-voltage-transformers-ferroresoant.html