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    AVR

    Uploaded by

    Elsayed Abdelmagid Mohamed
    - The document provides technical specifications for an electrical transformer including its rated power, percentage impedance, voltage and current ratings, number of taps, and recommendations for overload current blocking and voltage regulation bandwidth settings. - Key details are the transformer's rated power of 40 MVA, percentage impedance of 23.26%, primary voltage range of 110-123.2 kV, secondary voltage of 12.5 kV, and recommendations to set overload current blocking to 11.7333 A and voltage regulation bandwidth to 2.55% corresponding to two taps. - The specifications are provided to configure protection settings for the transformer.

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

    AVR

    Uploaded by

    Elsayed Abdelmagid Mohamed
    196 views2 pages
    - The document provides technical specifications for an electrical transformer including its rated power, percentage impedance, voltage and current ratings, number of taps, and recommendations for overload current blocking and voltage regulation bandwidth settings. - Key details are the transformer's rated power of 40 MVA, percentage impedance of 23.26%, primary voltage range of 110-123.2 kV, secondary voltage of 12.5 kV, and recommendations to set overload current blocking to 11.7333 A and voltage regulation bandwidth to 2.55% corresponding to two taps. - The specifications are provided to configure protection settings for the transformer.

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    AVR.xls

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    - The document provides technical specifications for an electrical transformer including its rated power, percentage impedance, voltage and current ratings, number of taps, and recommendations for overload current blocking and voltage regulation bandwidth settings. - Key details are the transformer's rated power of 40 MVA, percentage impedance of 23.26%, primary voltage range of 110-123.2 kV, secondary voltage of 12.5 kV, and recommendations to set overload current blocking to 11.7333 A and voltage regulation bandwidth to 2.55% corresponding to two taps. - The specifications are provided to configure protection settings for the transformer.

    Copyright:

    © All Rights Reserved
    Download as XLS, PDF, TXT or read online from Scribd
    Download as xls, pdf, or txt
    196 views2 pages

    AVR

    Uploaded by

    Elsayed Abdelmagid Mohamed
    - The document provides technical specifications for an electrical transformer including its rated power, percentage impedance, voltage and current ratings, number of taps, and recommendations for overload current blocking and voltage regulation bandwidth settings. - Key details are the transformer's rated power of 40 MVA, percentage impedance of 23.26%, primary voltage range of 110-123.2 kV, secondary voltage of 12.5 kV, and recommendations to set overload current blocking to 11.7333 A and voltage regulation bandwidth to 2.55% corresponding to two taps. - The specifications are provided to configure protection settings for the transformer.

    Copyright:

    © All Rights Reserved
    Download as XLS, PDF, TXT or read online from Scribd
    Download as xls, pdf, or txt
    of 2

    23.

    26 %
    40 MVA
    +12 % to -16 %
    110 kV
    123.20 kV
    92.40 kV
    12.5 kV
    1847.52 A
    22 TAPS
    10 TAP
    1.27 %
    2 STEPS
    2.55 %
    500 A
    12500V / 100V = 125
    300A / 1A = 300
    I
    C
    =
    V |Z|
    112.20 kV
    CORRESPONDING SECONDARY VOLTAGE: 12.75 kV
    250 V
    11.72
    2.73
    I
    C
    = 91.72 A
    = 90 A
    Current carrying capacity of OLTC as per manufacturer = 500 A
    Corresponding current on Secondary side = 4400 A
    Set over current Blocking at = 80% OF 4400A
    = 3520.00 A
    Relay current = 11.7333 A
    PRIMARY VOLTAGE ON LOWER TAP:
    RESULTANT VOLTAGE:
    BASE IMPEDANCE (IN OHMS):
    TRAFO IMPEDNACE (IN OHMS):
    RECOMMENDED SETTING
    NUMBER OF TAPS:
    NOMINAL TAP IS NO.:
    LOWER THAN OTHER PARALLELED TRANSFORMER(S).
    STEP VOLTAGE:
    VOLTAGE REGULATION AFTER:
    REGULATION SETTING:
    TRANSFORMER REGULATION:
    PRIMARY SIDE RATED VOLTAGE (NOMINAL TAP):
    PRIMARY SIDE RATED VOLTAGE (MAXIMUM TAP):
    OVERCURRENT BLOCKING
    RATED SECONDARY SIDE CURRENT:
    CALCULATION OF CIRCULATING CURRENT
    FOR CALCULATION PURPOSES, ASSUME TRANSFORMER IS TWO TAPS
    PRIMARY SIDE RATED VOLTAGE (MINIMUM TAP):
    SECONDARY SIDE RATED VOLTAGE (AT NOMINAL PRIMARY TAP):
    OLTC RATED CURRENT:
    CT & VT DATA
    VT RATIO FACTOR:
    CT RATIO FACTOR:
    AVR SETTING CALCULATION
    BASIC TRANSFORMER DATA
    VECTOR GROUP: YNyn0(d5)
    TRANSFORMER RATED POWER IN MVA:
    PERCENTAGE IMPEDANCE:
    Recommended O/C blocking I> = 11.7333 A
    Recommended Band width Us = 2.55%
    corresponding to two tap to avoid the hunting of the OLTC.
    BANDWIDTH SELECTION
    It is necessary to keep the band width approximately

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