Abstract
Present IEC as well as National Standards define rules for the measurement of lightning impulse voltages by specifying requirements for the accuracy of impulse shape parameters as well as requirements related to the step response of a measuring system used for recording the impulse voltage. For full 1.2/50 lightning impulses without superimposed oscillations the response requirements are only given by the Response Time T of a unit step response. This figure, however, is not sufficient to detect virtual front times T/sub 1/ of the original, true impulse wave shapes which are not any more within the tolerances provided for a standard lightning impulse. Based upon a great number of computations using the convolution integral, a thorough investigation of the measuring errors and the relationship between virtual front time T/sub 1/ and relevant response parameters is made. As a result, the partial response time T..cap alpha.. and the overshoot delta of the step response of the measuring system are considered to be the main parameters determining the errors in the measurement of T/sub 1/. These three values can be interlinked to propose new recommendations for ensuring the measuring accuracy for T/sub 1/.
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