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    Load Test Single Phase Transformer

    Uploaded by

    rakshnaanachiyar.suresh

    Copyright:

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

    Load Test Single Phase Transformer

    Uploaded by

    rakshnaanachiyar.suresh
    1 views8 pages

    Original Title

    Load Test Single phase transformer

    Copyright

    © © All Rights Reserved

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    PDF, TXT or read online from Scribd

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    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    1 views8 pages

    Load Test Single Phase Transformer

    Uploaded by

    rakshnaanachiyar.suresh

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 8

    CIRCUIT DIAGRAM – 3.

    1(b) LOAD TEST ON SINGLE PHASE TRANSFORMER

    Fuse M L
    P
    A A
      Fuse
    B Ip 230 230 Is
    D C V D
    230,50 Hz, P P
    S S 1-Ph
    1-
    T v Py Sec v T Variable
    AC Resistive
    S1 E Vp S2
    Supply Vs Load
    C 0 0
    Fuse
    1:1
    N

    PANEL BOARD
    Single Phase
    Single Phase Transformer
    AUTOTRANSFORMER

    NAME PLATE DETAILS: TRANSFORMER

    RATED PRIMARY VOLTAGE =

    RATED SECONDARY VOLTAGE =

    RATED POWER =

    26
    Experiment No.

    LOAD TEST ON SINGLE PHASE TRANSFORMER

    AIM
    To conduct load test on a single phase transformer and to determine the %
    efficiency and % voltage regulation.

    APPARATUS REQUIRED

    Sl. No. Name of the apparatus Range Quantity

    1. Voltmeter

    2. Ammeter

    3. Wattmeter

    4. DPST switch

    5. Connecting wires

    PRECAUTIONS

    1. Appropriate fuse wires should be fixed.


    2. Both DPST switches should be kept in open position
    3. The auto-transformer should be kept in zero position.
    4. All load switches should be kept in open position.

    27
    DESIGN OF APPARATUS REQUIRED

    28
    PROCEDURE
    1. Make the connections as shown in circuit diagram 4.1.
    2. Close the DPST S1.
    3. Adjust the auto transformer to apply rated voltage across the primary winding.
    4. Close the DPST S2 and note down the no load readings.
    5. Apply the load and note down the ammeter, voltmeter and wattmeter readings.
    6. Repeat step 5 till the ammeter reads the rated current.
    7. Open all the load switches one by one. Open DPST S2.
    8. Bring the auto transformer to zero position.
    9. Open DPST S1 and disconnect the circuit.

    FORMULA TO BE USED

    where,
    Wp - Input power in the primary (W)
    Ws - Output power in the secondary (W)
    Vso - No load secondary voltage (V)
    Vs - Secondary voltage at load (V)

    29
    TABLE – 3.1 (b)LOAD TEST ON SINGLE PHASE TRANSFORMER

    Input power in the


    primary Output power in Efficiency
    Sl. Wp the secondary
    No. Vp (V) Ip (A) Vs (V) Is (A) %η % Regulation
    Ws (W)
    Obs (div) Act (W)

    10

    30
    MODEL CALCULATION

    31
    MODEL CALCULATION

    32
    MODEL GRAPHS

    % Efficiency Vs Output power (W) % Regulation Vs Output power (W)

    () Regulation
    Efficiency
     ()

    Output Power (W) Output Power (W)

    RESULT

    INFERENCE

    35

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