A physical approach of the test voltage function for evaluation of the impulse parameters in lightning impulse voltages with superimposed oscillations and overshoots

Diaz, Ricardo Ruben
Segovia, Adán Aldo

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Publication date

October 2016

DOI

10.1109/TDEI.2016.7736833

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

ISSN

1070-9878

Journal

IEEE Transactions on Dielectrics and Electrical Insulation

Abstract

The introduction of the test voltage function or k-factor in IEC 60060-1 Ed. 3 has been an important step to ensure reproducibility and traceability in high voltage tests techniques for lightning impulses with superposed oscillations and overshoots. The standard recommends computed fitting methods to extract a base curve from the oscillating recorded voltage curve and, applying the test voltage function, it is possible to calculate the impulse parameters. Testing external insulations with positive polarity lightning impulses at 50% breakdown voltage or lower level, the disruptive discharge usually arrives after ten microseconds. For these cases the test voltage function and procedures for calculating impulse parameters proposed by the stand...