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    Measurement High Voltage (Spark Gaps)

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    L Rahman Aliffianto
    Sphere gaps can be used to measure high voltages above 10 kV. They consist of two conductive spheres spaced a certain distance apart. The spheres can be arranged vertically with the lower sphere grounded or horizontally with both spheres connected to the voltage source. The sparkover voltage between the spheres corresponds to the input voltage and this relationship should be within 3% for accurate measurement. Factors like humidity, temperature, air pressure, and gap distance influence the sparkover voltage.

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    Measurement High Voltage (Spark Gaps)

    Uploaded by

    L Rahman Aliffianto
    127 views6 pages
    Sphere gaps can be used to measure high voltages above 10 kV. They consist of two conductive spheres spaced a certain distance apart. The spheres can be arranged vertically with the lower sphere grounded or horizontally with both spheres connected to the voltage source. The sparkover voltage between the spheres corresponds to the input voltage and this relationship should be within 3% for accurate measurement. Factors like humidity, temperature, air pressure, and gap distance influence the sparkover voltage.

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    Sphere gaps can be used to measure high voltages above 10 kV. They consist of two conductive spheres spaced a certain distance apart. The spheres can be arranged vertically with the lower sphere grounded or horizontally with both spheres connected to the voltage source. The sparkover voltage between the spheres corresponds to the input voltage and this relationship should be within 3% for accurate measurement. Factors like humidity, temperature, air pressure, and gap distance influence the sparkover voltage.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    127 views6 pages

    Measurement High Voltage (Spark Gaps)

    Uploaded by

    L Rahman Aliffianto
    Sphere gaps can be used to measure high voltages above 10 kV. They consist of two conductive spheres spaced a certain distance apart. The spheres can be arranged vertically with the lower sphere grounded or horizontally with both spheres connected to the voltage source. The sparkover voltage between the spheres corresponds to the input voltage and this relationship should be within 3% for accurate measurement. Factors like humidity, temperature, air pressure, and gap distance influence the sparkover voltage.

    Copyright:

    © All Rights Reserved
    Download as PPTX, PDF, TXT or read online from Scribd
    Download as pptx, pdf, or txt
    of 6

    Measurement Of High Voltages

    & High Currents


    Lutfir Rahman A - 176060300111015
    High Voltage Measurement Techniques

    2
    Sphere Gaps
     Applicatios:
     Voltage Measurement (Peak) - Peak values of voltages may be measured above about 10
    kV by means of spheres.
     Arrangements:
    1. Vertically with lower sphere grounded (For Higher Voltages)
    2. Horizontally with both spheres connected to the source voltage or one sphere grounded
    (For Lower Voltages).

    3
    Sphere Gaps
     The arrangement is selected based on the relation between the peak voltage,
    determined by sparkover between the spheres, and the reading of a voltmeter on the
    primary or input side of the high-voltage source. This relation should be within 3%
    (IEC, 1973).
     Standard values of sphere diameter are 6.25, 12.5, 25, 50, 75, 100, 150, and 200 cm.
     The Clearance around the sphere gaps:

    4
    Sphere Gaps
     The effect of humidity is to increase the breakdown voltage of sphere gaps by up to
    3%.
     Temperature and air pressure, however, have a significant influence on breakdown
    voltage.
     Breakdown Voltage under normal atmospheric conditions is, Vd=kd Vd0 ; where k is
    a factor related to the relative air density (RAD) δ.

     The relation between the RAD(δ) and the correction factor k:

     Under impulse voltages, the voltage at which there is a 50% breakdown probability
    is recognized as the breakdown level.

    5
    Sphere Gaps
     Factors Influencing the Sparkover Voltage of Sphere Gaps
    i. Switching surges,
    ii. Atmospheric conditions and humidity,
    iii. Irradiation.
     The limits of accuracy are dependant on the ratio of the spacing d to the sphere
    diameter D, as follows:
     d < 0.5 D Accuracy = ± 3 %
     0.75 D > d > 0.5 D Accuracy = ± 5 %
     For accurate measurement purposes, gap distances in excess of 0.75D are not used

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