A transformer is a device that transfers electric energy from one alternating-current circuit to one or more other circuits, either increasing (stepping up) or reducing (stepping down) the voltage.
What is the transformer PDF?
A Transformer is a static electrical device that transfers electrical energy between two or. more circuits through electromagnetic induction. A varying current in one coil of the. transformer produces a varying magnetic field, which in turn induces a varying. electromotive force (e.m.f) or “voltage” in a second coil.
What are the 3 types of transformers PDF?
- Step down transformer.
- Step up transformer.
- Single phase transformer.
- Three phase transformer.
- Power transformer.
- Distribution transformer.
- Current transformer.
- Isolation transformer.
What are the 3 types of transformers?
Depending on the Power rating and specification, Power transformers can further be classified into three categories: Small power transformer, Medium Power transformers, and the Large power transformers.
What is the transformer principle?
The transformer works on the principle of Faraday’s law of electromagnetic induction and mutual induction. There are usually two coils primary coil and secondary coil on the transformer core. The core laminations are joined in the form of strips.
What is the function of transformer?
Transformers are used in electric circuits to change the voltage of electricity flowing in the circuit. It is used to increase the voltage (called ‘stepping up’) or decrease the voltage (‘stepping down’) in AC circuits. Q. A transformer is designed to convert an AC voltage of 220 V to an AC voltage of 12 V.
What is transformer and its parts?
A transformer is made of several different parts that function in their own different ways to enhance the overall functioning of a transformer. These include core, windings, insulating materials, transformer oil, tap changer, conservator, breather, cooling tubes, Buchholz Relay and explosion vent.
What are the 5 applications of transformer?
- Alternating Current Regulation.
- Charging Batteries.
- Steel Manufacturing.
- Controlling the flow of Electricity through a circuit.
- Audio Transformer.
- Ammeters or Current Transformers.
What is transformer application?
Transformers are indeed employed in telecommunication as well as instrumentation circuits, as well as control circuits. Input transformers, interstage transformers, as well as outputting transformers are commonly used in radio and television circuits.
What are the 2 types of transformers?
- Power Transformers. A power transformer transfers electricity between a generator and the distribution primary circuits.
- Autotransformers. Now, let’s make things even more complicated.
- Generator Step-Up Transformers. Moving right along to GSUs or generator step-up transformers.
- Auxiliary Transformers.
What is the name of transformer?
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What is a unit transformer?
Unit Transformer means the transformers through which the generated voltage is transformed to grid voltage (132 kV) used for evacuation of power to the national grid.
What are the classification of transformer?
These are classified as power transformer, protection transformer, measuring transformer and distribution transformer.
Why kVA rating is used in transformer?
As, the copper loss or I2R loss depends on the current and the iron or core loss depends upon the voltage of the transformer. Thus, the total losses in a transformer depend upon volt-ampere (VA) only and not on the power factor of the load. That is why the transformer rating is given in kVA and not in kW.
What are the main parts of transformer?
There are three basic parts of a transformer: an iron core which serves as a magnetic conductor, a primary winding or coil of wire and. a secondary winding or coil of wire.
What are the characteristics of transformer?
- The input and output power has the same frequency.
- All transformers work on the principle of electromagnetic induction.
- The primary and secondary coil are not connected.
- The loss in a transformer is much smaller compared to other devices.
What is efficiency of a transformer?
The transformer’s efficiency is generally in the range of 95 – 99 %. The efficiency can be as high as 99.7% for great power transformers with very low wastes.
What is step of transformer?
A transformer that increases the voltage from primary to secondary (more secondary winding turns than primary winding turns) is called a step-up transformer. Conversely, a transformer designed to do just the opposite is called a step-down transformer.
Does a transformer convert AC to DC?
A transformer is not designed to convert AC to DC or DC to AC. The transformer can step-up or step -down current. A transformer that increases the voltage from the primary to secondary is called a step-up transformer.
Do transformers work with AC or DC?
A transformer is a device which step-up or step-down the level of AC current or voltage without changing the primary (i.e. input source) frequency. Transformer only works on AC and can’t be operated on DC i.e. it has been designed to be operated only and only on alternating current and voltage.
What is the EMF of transformer?
emf = turns x rate of change This is known as the Transformer EMF Equation. For the primary winding emf, N will be the number of primary turns, ( NP ) and for the secondary winding emf, N will be the number of secondary turns, ( NS ).
What is the ratio of transformer?
The turns ratio of a transformer is defined as the number of turns on its secondary divided by the number of turns on its primary.
What is current ratio in transformer?
Definition: 1) The ratio of primary amps divided by secondary amps. 2) The current ratio provided by the windings of the CT. For example, a CT that is rated to carry 200 Amps in the primary and 5 Amps in the secondary, would have a CT ratio of 200 to 5 or 40:1.
Where Buchholz Relay is used?
Buchholz relays have been applied on oil-filled power and distribution transformers at least since the 1940s. The relay is connected to the oil piping between the overhead conservator tank and the main oil tank of a transformer.
What is inside of transformer?
Distribution transformers consist of a magnetic core made from laminations of sheet silicon steel (transformer steel) stacked and either glued together with resin or banded together with steel straps, with the primary and secondary wire windings wrapped around them.