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  • Impulse Test Classification

    Class I tests
    – tests carried out with the nominal discharge current In(8/20), the 1,2/50μs voltage impulse and the maximum impulse current Iimp(10/350) for class I test.

    Class II tests
    – tests carried out with the 1,2/50μs voltage impulse, with the nominal discharge current In(8/20) and the maximum discharge current Imax(8/20) for the class II test.

    Class III tests
    – tests carried out with the combination wave (1,2/50μs; 8/20μs).

    Nominal voltage
    – it is an effective value of the voltage between operating conductors of LV power system; in 3-phased LV power system, it is an effective value of the delta voltage.

    Overvoltage
    – any voltage, which exceeds the appropriate peak value of the highest steady voltage of LV power system under the normal operating conditions; it is expressed either absolutely or as a relative magnitude by means of overvoltage factors.

    Transverse overvoltage
    – a voltage between two line conductors of LV power system at the moment of its load (typically between busbars L/N).

    Lengthwise overvoltage
    – a voltage between particular line conductors of LV power system on earthing (typically between busbars L/PE event. N/PE).

    Switching overvoltage
    – an overvoltage between a phase and earth or between phases at a given place of the LV power system, caused by switching operation, short-circuit or by other cause.

    Atmospheric overvoltage
    – an overvoltage between a phase and earth or between phases at a given place of the LV power system, caused by discharge of atmospheric electricity (lightning).ks of disruptive discharge or sparkover.

     

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