Electrical Laws
Ohm's Law Coulomb's Law Kirchoff's Law Faraday's Law Ampere's Law Joule's Law Lenz's Law Biot Savart LawElectrical Theorems
Thevenin Theorem Nortons Theorem Super Position Theorem Reciprocity Theorem Compensation Theorem Maximum Power Transfer Millmans Theorem Tellegans TheoremElectrical Rules
Flemings Left Hand Rule Flemings Right Hand Rule Cork Screw RuleElectrical Network
Network TerminologiesElectrical Terms
Electrical Terms Materials Capacitors Resistors Inductor Self Inductance Mutual Inductance Magnetic Flux Magnetic Characteristics EMF MMF Permeability Sources Reluctance TorqueElectrical Transformer
Transformers How Transformer Works Transformer Classifications Types Transformers Core Type Transformers Ideal Transformers Parallel Operation Transformer Cooling Transformer Forces Transformer Losses Transformer Testing Transformer Bushing Transformer WindingsTypes of Transformer
Auto Transformer Current Transformer Potential Transformer Rectifier Transformer Converter TransformerAC Motor
Stator and Rotor Three Phase Induction Motor Induction Motor TransformerAC Generator
AC Generators Alternator Stator Construction Alternator Rotor Construction Alternator - Parallel Operation Synchronizing AC Alternator Losses in AlternatorDC Motors
DC Motors Commutator Braking of Electric Motors Dynamic Rheostatic Braking Regenerative Braking Plugging Braking Speed Control DC Motor Losses DC MotorsTypes Of DC Motor
DC Motors Types DC Series Motors DC Shunt Motors DC Compound Motor Brushless DC Motors Permanent Magnet DC MotorStarter For DC Motors
Starters DC MotorsDC Generator
DC Generator Types DC Generators Sparking DC Generators Why Generator Overloading Losses DC GeneratorsParallel Operation
PO - DC Generator Series DC Generator Shunt DC Generator Compound DC GeneratorThe ones who are crazy enough to think they can change the world are the ones who do.- Steve Jobs
Ideal Transformers
What is Ideal Transformer
An ideal transformer is one which has no losses in it. An ideal transformer is completely an imaginary transformer, Though Ideal transformer doesn't exist in this world, the study is made to better understanding of actual transformer. Ideal transformer winding have no ohmic resistance and there is no magnetic leakage. Simply, an ideal transformer consists of two coils which are purely inductive and wound on a loss-free core.
Ideal Transformer on NO LOAD
Consider an ideal transformer whose primary is connected to a sinusoidal alternation voltage source s and whose secondary is opened. Under this condition, when the sinusoidal voltage s is turned ON, the primary draws a current from the source to build up a emf(self induced) which is equal and opposite to the applied voltage source s. Since the coils are purely inductive and there is no load, the primary draws the magnetising current Iμ from the applied voltage source s to magnetise the core. This alternating magnetising current Iμ produces an alternating flux Φ which is proportional to the current and hence is in phase with it. This changing flux is linked with both the windings. Due to this changing flux an emf (e2) is induced in the secondary side called mutually induced emf This mutually induced emf (e2) acts very much similar to the self induced emf (e1) ie) in phase and opposite to the applied voltage v1 Here, the magnitute of the mutually induced emf is proportional to the rate of change of flux and the number of secondary turns.
Ideal Transformer ON LOAD
Consider an Ideal transformer whose secondary is loaded. When the secondary is loaded, secondary current I2 is set up as it forms a closed circuit. The magnitude of I2 is determined by the characteristic of the load. Due to the current I2, the flux Φ2 is set up which opposes to the primary flux Φ, which is due to Io. The opposing secondary flux Φ2 weakens the primary flux for a very short time and primary back emf E1 tends to reduce. At that particular time, V1 > E1 and hence causes more current(I'2) to flow in the primary winding. This current I'2 is also known as load component of primary current. I'2 current is in phase and opposition to current I2 in the secondary winding. Similarly the flux Φ'2 opposes Φ2 in the same direction with equal magnitude. Thus, the secondary current I2 get neutralized immediately by additional primary current I'2.
Ideal transformer NO LOAD vs Ideal Transformer ON LOAD
| NO LOAD Ideal Transformer | ON LOAD Ideal Transformer |
|---|---|
| Net Flux passing through the core is approximately equal to ON load ideal transformer | Net Flux passing through the core is approximately equal to NO load ideal transformer |
| I2 = 0 | I2 α to load |
| Core loss is same as ON load Ideal transformer | Core loss is same as NO load Ideal transformer |
| Primary current = I0 | Primary current = I0 + I'2 |
Related to Ideal Transformers
Most visited
Report Us
We may make mistakes(spelling, program bug, typing mistake and etc.), So we have this container to collect mistakes. We highly respect your findings.
Programming
Electrical
Interview
© Copyright 2019