Electrical machine l
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Transcript of Electrical machine l
Welcome to our Presentation
Group-E1.Abu mohammad Fazlay rabbyId:152-33-26192.Fatema tuj zohraId:152-33-26103.Mehedi hasanId:152-33-26254.Abdur RahmanId:152-33-26925.Roudra GourabID:152-33-2693
Contents
• Fazlay Rabby ------Problem with 3-phase transformer.• Roudro---Typs of transformer• Fatema---Step up and Step down Transformer• Mehedi ----Transformer with resistance and magnetic leakage• Alamgir--Equivalent Circuit
Three phase transformer
• 3-φ supplies are used for electrical power generation, transmission, and distribution, as well as for all industrial uses
Problem with three phase transformer
• Greater cost of standby Units.• Increased cost and inconvenience of repairs.• In Single Phase transformer ( three Single Phase Transformer) failure of
one transformer, the other two, Single Phase Transformer still supply the power, while it is not possible in case of failing a Three Phase Transformer.
• Each of the 1Ø transformers weight substantially less than the corresponding 3Ø transformer. This allows a line truck to hang transformers where a 3Ø transformer might need a crane.
Welcome to my presentation
Topic-Types of TransformerPresented by
Gourab Das-152-33-2693
THANK
YOU
ALL
Presentation on Step up & step down transformer• Fatema tuj johra• ID-152-33-2610
Step-up Transformer
• On a step-up transformer there are more turns on the secondary coil than the primary coil. The induced voltage across the secondary coil is greater than the applied voltage across the primary coil or in other words the voltage has been “stepped-up”.
Step up transformer
Step down transformer
• A step down transformer has less turns on the secondary coil that the primary coil. The induced voltage across the secondary coil is less the applied voltage across the primary coil or in other words the voltage is “stepped-down”.
Step down transformer
Generally, both primary and secondary windings of electrical power transformer are made of copper. Copper is a very good conductor of current but not a super conductor. Actually, super conductor and super conductivity both are conceptual, practically they are not available. So both windings will have some resistance. This internal resistance of both primary and secondary windings is collectively known as resistance of transformer.
Transformer’s Winding resistance
Transformer’s Winding resistance in a exact equivalent circuit
Transformer’s magnetic leakage
In a transformer it is observed that, all the flux linked with primary winding does not get linked with secondary winding. A small part of the flux completes its path through air rather than through the core and this small part of flux is called as leakage flux or magnetic leakage in transformers.
Transformer’s magnetic leakage in a exact equivalent circuit
Transformer’s impedance
As we said, both primary and secondary windings will have resistance and leakage reactance. These resistance and reactance will be in combination, is nothing but impedance of transformer. If R1 and R2 and X1 and X2 are primary and secondary resistance and leakage reactance of transformer respectively, then Z1 & Z2 impedance of primary and secondary windings are respectively,
PresentationonMagnetic Leakage in Transformer
Presented byMd. Abdur RahmanID:152-33-2692Sec:B ; Group:EDept. of EEE
Index• Magnetic Leakage• Transformer With Resistance And Leakage Reactance• Vector diagram
Magnetic Leakage in Transformer• Magnetic Leakage can be defined as the
passage of magnetic flux outside the path along which it can do useful work.
• In a transformer it is observed that, all the flux linked with primary winding does not get linked with secondary winding. A small part of the flux completes its path through air rather than through the core , and this small part of flux is called as leakage flux of transformers.
Transformer With Resistance And Leakage Reactance
Vector diagram for different kinds of the load
( When Load is Non-Inductive) ( When Load is Inductive) ( When Load is Capacitive)