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TRANSFORMER
CONSTRUCTION TYPES
CONTENT:
 INTRODUCTION
 BASIC PRICIPLE
 TYPES
 APPLICATIONS
INTRODUCTION
 The transformer is a static device which is used to
transfer electrical energy from one ac circuit to another
ac circuit.
 Input to a transformer and output from a transformer
both are alternating quantities (AC).
 Electrical energy is generated and transmitted at an
extremely high voltages. The voltage is to be then
reduced to a lower value for its domestic and industrial
use.
 This is done by using a transformer.
 The power transmission system using transformers is
shown in figure.
 When the transformer changes the voltage level, it
changes the current level also.
Basic Principle
 The primary winding is connected to the single –
phase ac supply, an ac current starts flowing through
it.
 The ac primary current produces an alternating flux
(Ф) in the core.
 Most of this changing flux gets linked with the
secondary winding through the core.
 The varying flux will induce voltage into the secondary
winding according to the faraday’s laws of
electromagnetic induction.
 Voltage level change but frequency i.e. time period
remains same.
 There is no electrical contact between the two
winding, an electrical energy gets transferred from
primary to the secondary.
 A simple transformer consists of two electrical
conductors called the primary winding and the
secondary winding.
 Energy is coupled between the windings by the time
varying magnetic flux that passes through( links) both
primary and secondary windings.
Transformer Types
 The transformer are of different types depending on
the arrangement of the core and the winding as
follows.
 Core Type
 Shell Type
 Berry Type
 The magnetic core is a stack of thin silicon-steel
laminations about 0.35 mm thick for 50 Hz
transformer. In order to reduce the eddy current losses,
these laminations are insulated from one another by
thin layers of varnish.
Core Type Transformer
Shell Type Transformer
Sr.
No
Core Type Transformer Shell Type Transformer
1. The core has only one
window.
The core has two windows.
2. Winding encircles the
core.
Core encircles the windings.
3. Cylindrical windings are
used.
Sandwich type windings are
used.
4. Easy to repair. It is not so easy to repair.
5. Better cooling since
more surface is exposed
to the atmosphere.
Cooling is not very effective.
Construction of Transformer
 The Most important parts of a transformer are the
windings (coils) and the core.
 Some other parts such as suitable tank, conservator,
bushings, breather, explosion vent etc. are also used
along with the core and windings.
Applications
 Step – up and Step – down Voltage
 Measurement of current in single and three phase
system
 Measurement of voltage in single and three phase
system
 Measurement of power
 Measurement of Energy
Presentation on Transformer.pptx

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Presentation on Transformer.pptx

  • 1. TRANSFORMER CONSTRUCTION TYPES CONTENT:  INTRODUCTION  BASIC PRICIPLE  TYPES  APPLICATIONS
  • 2. INTRODUCTION  The transformer is a static device which is used to transfer electrical energy from one ac circuit to another ac circuit.  Input to a transformer and output from a transformer both are alternating quantities (AC).  Electrical energy is generated and transmitted at an extremely high voltages. The voltage is to be then reduced to a lower value for its domestic and industrial use.  This is done by using a transformer.
  • 3.  The power transmission system using transformers is shown in figure.  When the transformer changes the voltage level, it changes the current level also.
  • 4. Basic Principle  The primary winding is connected to the single – phase ac supply, an ac current starts flowing through it.
  • 5.  The ac primary current produces an alternating flux (Ф) in the core.  Most of this changing flux gets linked with the secondary winding through the core.  The varying flux will induce voltage into the secondary winding according to the faraday’s laws of electromagnetic induction.  Voltage level change but frequency i.e. time period remains same.  There is no electrical contact between the two winding, an electrical energy gets transferred from primary to the secondary.
  • 6.  A simple transformer consists of two electrical conductors called the primary winding and the secondary winding.  Energy is coupled between the windings by the time varying magnetic flux that passes through( links) both primary and secondary windings.
  • 7. Transformer Types  The transformer are of different types depending on the arrangement of the core and the winding as follows.  Core Type  Shell Type  Berry Type  The magnetic core is a stack of thin silicon-steel laminations about 0.35 mm thick for 50 Hz transformer. In order to reduce the eddy current losses, these laminations are insulated from one another by thin layers of varnish.
  • 10. Sr. No Core Type Transformer Shell Type Transformer 1. The core has only one window. The core has two windows. 2. Winding encircles the core. Core encircles the windings. 3. Cylindrical windings are used. Sandwich type windings are used. 4. Easy to repair. It is not so easy to repair. 5. Better cooling since more surface is exposed to the atmosphere. Cooling is not very effective.
  • 11. Construction of Transformer  The Most important parts of a transformer are the windings (coils) and the core.  Some other parts such as suitable tank, conservator, bushings, breather, explosion vent etc. are also used along with the core and windings.
  • 12. Applications  Step – up and Step – down Voltage  Measurement of current in single and three phase system  Measurement of voltage in single and three phase system  Measurement of power  Measurement of Energy