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    6 Series Generator

    Uploaded by

    Harshal
    series gen

    Copyright:

    © All Rights Reserved
    Download as DOC, PDF, TXT or read online from Scribd

    6 Series Generator

    Uploaded by

    Harshal
    6 views5 pages
    series gen

    Copyright

    © © All Rights Reserved

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    DOC, PDF, TXT or read online from Scribd

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    series gen

    Copyright:

    © All Rights Reserved
    Download as DOC, PDF, TXT or read online from Scribd
    Download as doc, pdf, or txt
    6 views5 pages

    6 Series Generator

    Uploaded by

    Harshal
    series gen

    Copyright:

    © All Rights Reserved
    Download as DOC, PDF, TXT or read online from Scribd
    Download as doc, pdf, or txt
    You are on page 1of 5

    EXPERIMENTNO:______ DATE:________

    AIM :TO TEST THE PERFORMANCE OF DC SERIES


    GENERATOR

    OBJECTIVES:

    After performing this experiment you will be able to;


    - Measure the effect of change of load current on the
    Terminal Voltage of dc series generator at constant
    speed.
    - Determine experimentally external and internal
    characteristics of a dc series generator.
    - Calculate the induced emf in the generator at various
    values of the load current.
    - Know its application.

    MACHINE SPECIFICATION:

    APPRATUS:

    SSr.No. DESCRIPTION SPECIFICATION RREQ.QTY.


    THEORY :

    - The curve showing the relation between the armature


    current(Ia) and emf (E) is the internal characteristic and the
    curve showing the relation between load current (Ia) and
    terminal voltage (Vt) is the external characteristic of dc series
    generator.
    - In dc series generator Ia = IL = Ise and its series field flux
    Ǿse α Ise α IL up to saturation of pole core.
    - Here, when load current IL is zero the generated emf and
    terminal voltage have some value due the cutting of residual
    flux by the armature conductors rotating at constant speed.
    - Now in this generator E α Ǿse at constant speed if the load
    on the generator armature will increase, the load current I L
    increase. The Ǿse α Ise α ILwill increase. As a result the
    generated emf E α Ǿse will also increase. At certain value of
    load current the flux in the pole will saturate and emf will be
    maximum.
    Vt = E – Drops will also increase if there is further increase
    in the load current IL the generated emf remains constant as
    the magnetic field is saturated. But the terminal voltage will
    reduce because of increase in voltage drop.

    PRECAUTIONS:

    1. Load on the generator should not exceed its rated


    value.
    2. Speed of the generator should be maintained
    constant.
    PROCEDURE :

    1.Connect Set up the circuit as shown in figure.


    Keep the rheostat mini. Position of start 3 – point starter.
    2.Take the reading of terminal voltage Vt and load current IL
    and field voltage Vf at NO load.
    3. Now gradually increase the load & take the reading & V t, IL,Vf,
    the NO Load & Full Load.
    4.Calculate the emf generated for each reading.

    5.Draw the characteristic graph


    .

    Armature resistance Ra = ______________ Ohm.

    Series Field Resistance = ______________ Ohm.

    Observation Table :-

    Sr. Terminal Load Field Armature Induced


    No. Voltage Current Voltage Volt (Va) EMF
    (IL) (Vf) (Va=IL.Ra)
    (Vt) Vt+Va + Vf
    (Volt)
    1
    2
    3
    4
    5
    6
    7

    CONCLUSION:
    ____________________________________________________
    ____________________________________________________
    ____________________________________________________
    ____________________________________________________
    ____________________________________________________
    ____________________________________________________
    ________________________________________________

    SHORT QUESTION:-

    1)Explain briefly the effect of load current on the


    terminal voltage of dc series generator?

    2)List the applications of dc series generator?


    For Performance Practical

    Sr.No. Criteria % weightage Marks


    1 Neat Sketch 10
    2 Correct & 25
    Specification
    3 Recording of Reading 40
    & Correct Calculation
    & graph
    4 Correct Answer to 15
    Sample Question &
    Conclusion
    5 Submission in time 10

    Faculty Sign. _____ Total Marks:______

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