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    Experiment 6 Aim:: Apparatus Required

    Uploaded by

    meghasingh_09
    The document describes an experiment to determine the equivalent circuit parameters of a single phase transformer through an open circuit test. The test involves connecting meters to measure the open circuit voltage, no load current, and no load power input of the transformer when the secondary side is open. The measurements are then used to calculate parameters like core loss, resistance, and reactance of the equivalent circuit model of the transformer.

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    Attribution Non-Commercial (BY-NC)
    Download as DOCX, PDF, TXT or read online from Scribd

    Experiment 6 Aim:: Apparatus Required

    Uploaded by

    meghasingh_09
    25 views3 pages
    The document describes an experiment to determine the equivalent circuit parameters of a single phase transformer through an open circuit test. The test involves connecting meters to measure the open circuit voltage, no load current, and no load power input of the transformer when the secondary side is open. The measurements are then used to calculate parameters like core loss, resistance, and reactance of the equivalent circuit model of the transformer.

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    Exp 6

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    The document describes an experiment to determine the equivalent circuit parameters of a single phase transformer through an open circuit test. The test involves connecting meters to measure the open circuit voltage, no load current, and no load power input of the transformer when the secondary side is open. The measurements are then used to calculate parameters like core loss, resistance, and reactance of the equivalent circuit model of the transformer.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    25 views3 pages

    Experiment 6 Aim:: Apparatus Required

    Uploaded by

    meghasingh_09
    The document describes an experiment to determine the equivalent circuit parameters of a single phase transformer through an open circuit test. The test involves connecting meters to measure the open circuit voltage, no load current, and no load power input of the transformer when the secondary side is open. The measurements are then used to calculate parameters like core loss, resistance, and reactance of the equivalent circuit model of the transformer.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 3

    Experiment 6

    Aim: To conduct open circuit test on the given single phase transformer to
    determine equivalent circuit parameters.

    APPARATUS REQUIRED:-

    i. Single phase Transformer


    ii. Wattmeter (0- 2.5/5A, 0-300V)
    iii. Ammeter (0- 2.5/5A)MI
    iv. Voltmeter (0-300/600V)MI
    v. Single phase Variac
    vi. Connecting wires

    THEORY:-

    A transformer is a device that transfers electrical energy from one circuit to


    another through inductively coupled conductors—the transformer's coils. A
    varying current in the first or primary winding creates a varying magnetic
    flux in the transformer's core, and thus a varying magnetic field through the
    secondary winding. This varying magnetic field induces a varying
    electromotive force (EMF) or "voltage" in the secondary winding. This
    effect is called mutual induction.

    It converts power available at one voltage level to power at another voltage


    level without affect the frequency and also without much change in the
    power, but for the internal losses. Voltage ratio is proportional to the turn’s
    ratio and current ratio is inversely proportional to the turn’s ratio.

    A transformer is normally a highly efficient machine. The main losses to be


    considered are
     magnetic or core losses(iron losses) and
     the copper losses.
    The open circuit and short circuit tests are effective methods of
    predetermining the performance characteristics of the transformer.
    The open circuit test is conducted by keeping usually, the high voltage side
    open and applying rated voltage to the low voltage side. Since the secondary
    side is open, the current drawn will be very small, may be about 20-30% of
    the full load value. Hence copper losses can be neglected and input power
    corresponds to core losses only.

    PROCEDURE:-

    1. Wire up the circuit as shown in the circuit diagram (Fig1). All the
    measuring instruments are connected on the primary side (220V side).
    2. Set the autotransformer to zero output and switch on the supply.
    3. Adjust the autotransformer so as to supply rated voltage to the primary
    winding.
    4. Note down the open circuit voltage “Voc”, no load current “Ioc” and the
    no load power input “Woc”.

    CIRCUIT DIAGRAM:-

    Observations:-
    Voc = Voltmeter reading = 220V
    Ioc = Ammeter reading = 0.5A
    Woc = Wattmeter reading = 75W

    CALCULATIONS:-

    From OC test:
    No load parameters-
    Cos θ o= Wo/(VoIo) = 0.6818
    Ic = Io Cos θ o = 0.3409A
    Im= Io Sin θ o = 0.3657A
    Ro = Vo/Ic = 645.35A
    Xo = Vo/Im = 601.47A

    RESULT:-

    Equivalent circuit parameters of the give transformer are determined and


    hence its performance can be judged.

    Precautions:-

    1. Ensure that the connections are correctly connected.


    2. Make proper connection of wattmeter blades.

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