#CORE_COPPER_LOSS_EDDY_CURRENT_HYSTERESIS_LOSS #CORE_LOSS_OF_TRANSFORMER #COPPER_LOSS_OF_TRANSFORMER #EDDY_CURRENT_OF_TRANSFORMER #HYSTERESIS_LOSS_OF_TRANSFORMER #BASIC ELECTRICAL ENGINEERING In this video you will learn Transformer ,Day 6, core loss,copper loss,eddy cuurent loss, Basic electrical and electronics engineering. Transformer is a static device, hence mechanical losses (like friction loss) are absent in it. A transformer only consists of electrical losses (iron losses and copper losses). Core Loss Or Iron Loss Or Constant loss: Core losses are due to the magnetic properties of the material used for the construction of core. Core is made by iron like CRGO so called iron loss. Core loss is treated as constant at rated voltage and frequency, so called constant loss. Eddy current loss:

1. Prof.Prasant Tiwari
DAY 6 LOSSES IN TRANSFORMER
ELECTRICAL
TRANSFORMER

2. ELECTRICAL TRANSFORMER
Transformer Syllabus
 Definition/Need of transformer
 Principle of Operation
 Construction
 EMF Equation
 Transformation Ratio
 Classification of Transformer
 Comparison between core & shell type
 Ideal & Practical Transformer
 Equivalent Circuit
 Losses in a Transformer
 Open circuit & Short circuit test
 Efficiency
Day 1
Day 4
Day 3
Day 2
Day 5

3. LOSSES IN A TRANSFORMER
 Transformer is a static device, hence mechanical losses (like friction loss) are absent in it. A
transformer only consists of electrical losses (iron losses and copper losses).

4. LOSSES IN A TRANSFORMER
Eddy current loss:
 In transformer, primary winding sets up an alternating magnetizing flux and is linked with the
secondary winding and it induces an emf .
 But some part of the flux gets linked with the body of the transformer as well and this circulates
current in the body which is known as Eddy Current.
 This current produces a loss in the core which is known as Eddy Current loss.
 This power is dissipated in the from of heat and is known as eddy currents loss.
Core Loss Or Iron Loss Or Constant loss:
 Core losses are due to the magnetic properties of the material used for the construction of core.
 Core is made by iron like CRGO so called iron loss.
 Core loss is treated as constant at rated voltage and frequency, so called constant loss.
Core loss is further classified into two types,
1. Hysteresis loss
2. Eddy current loss

5. EDDY CURRENT LOSS IN TRANSFORMER
Mathematical equations of eddy current
How to reduce eddy current loss ?
1. Eddy current magnitude can be reduced by designing the core
as a set of thin sheets or laminations, in parallel to the
magnetic field.
 Each sheet must be insulated from its neighbours with a thin
coating of varnish or oxide film. By laminating the core, the
area of each section and hence the induced EMF is reduced.
2. By adding 3 to 5% silicon.
 Which increases resistance of core so induced eddy current will
be low.More than 5% it will makes core brittle

6. HYSTERESIS LOSS IN TRANSFORMER
Hysteresis loss:
 Hysteresis loss is due to reversal of magnetization in the
transformer core.
 Every magnetic material has some domains or small
magnetic parts consisting of plus and minus poles in it. In
normal condition, these domains remains in an arbitrary
position. But when subjected to a magnetic field, these
domains comes parallel with the magnetic lines of
forces(flux). When again the magnetic source is removed the
domains goes back to their same arbitrary state.
 Now, as the transformer works in alternating current, there
are reversals of every cycles. So, the domains also changes
their positions w.r.t the cycle. Due to the frequent changing
of the positions, there is some certain amount of work
done. For this reason, there is some amount of electrical
energy wasted. This wasted energy is known as Hysteresis
Loss.

7. HYSTERESIS LOSS IN TRANSFORMER

8. COPPER LOSS IN A TRANSFORMER
Copper Loss In Transformer:
 Copper loss is due to ohmic resistance of the transformer.
 Winding's. copper loss in transformer varies with the load.

9. COPPER LOSS IN A TRANSFORMER
 Copper losses varies as the square the load current or KVA.

10. WHY CORE AND EDDY CURRENT LOSSES ARE CONSTANT LOSS?
 EDDY CURRENT loss is constant loss at rated voltage,
prove that..
 HYSTERESIS loss is depends upon frequency at rated
voltage prove that..

11. CAPSULES OF TRANSFORMER LOSSES
Key Points of todays lecture.
 Transformer is a static device, hence mechanical losses (like friction loss)
are absent
 Core loss is treated as constant at rated voltage and frequency, so called
constant loss.
 Power is dissipated in the from of heat and is known as eddy currents loss.
 Winding's. copper loss in transformer varies with the load.
 Copper losses varies as the square the load current or KVA.
 Eddy current can be reduced by designing the core as a set of thin sheets or
laminations & adding 3-5% silicon.
 Silicon increases resistance of transformer core.
 Adding more silicon makes core brittel.
 Hysteresis loss is due to reversal of magnetization in the transformer core.
 HYSTERESIS loss decreases as increase in transformer supply frequency at
rated voltage.
 Transformer is rated in volt ampere(VA).
 High frequency machine have better efficiency.
 We use 400 Hz frequency in aircrafts.