Zero-Phase Filtering for Lightning Impulse Evaluation

A K-factor Filter for the Revision of IEC60060-1 and -2

P.L. Lewin, T.N. Tran, D.J. Swaffield, J.K. Hällström

Research output: Contribution to journalArticleScientificpeer-review

21 Citations (Scopus)

Abstract

The next revision of the international standard for high-voltage measurement techniques, IEC 60060-1, has been planned to include a new method for evaluating the parameters associated with lightning impulse voltages. This would be a significant improvement on the loosely defined existing method which is, in part, reliant on operator judgment and would ensure that a single approach is adopted worldwide to determine peak voltage, front, and tail times, realizing standardization in measured parameters across all laboratories. Central to the proposed method is the use of a K-factor to attenuate oscillations and overshoots that can occur with practical generation of impulse voltages for testing on high-voltage equipment. It is proposed that a digital filter that matches the K-factor gain characteristic be implemented and used for this purpose. To date, causal filter designs have been implemented and assessed. This paper is concerned with the potential application of a noncausal digital filter design to emulate the K-factor. The approach has several advantages; the resulting design is only second order, it can be designed without using optimization algorithms, it is a zero-phase design and it matches the K-factor almost perfectly. Parameter estimation using waveforms from the IEC 61083-2 test data generator and experimental impulse voltages has been undertaken and obtained results show that the zero-phase filter is the ideal digital representation of the proposed K-factor. The effect of evaluating parameters by the proposed method is compared to mean-curve fitting and the challenge of effective front-time evaluation is discussed.
Original languageEnglish
Pages (from-to)3-12
Number of pages10
JournalIEEE Transactions on Power Delivery
Volume23
Issue number1
DOIs
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

Fingerprint

Lightning
Electric potential
Digital filters
Voltage measurement
Curve fitting
Parameter estimation
Standardization
Testing

Keywords

  • Digital filters
  • IEC 60060-1
  • high-voltage techniques
  • impulse testing
  • pulse measurements
  • zero-phase filter

Cite this

Lewin, P.L. ; Tran, T.N. ; Swaffield, D.J. ; Hällström, J.K. / Zero-Phase Filtering for Lightning Impulse Evaluation : A K-factor Filter for the Revision of IEC60060-1 and -2. In: IEEE Transactions on Power Delivery. 2008 ; Vol. 23, No. 1. pp. 3-12.
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Zero-Phase Filtering for Lightning Impulse Evaluation : A K-factor Filter for the Revision of IEC60060-1 and -2. / Lewin, P.L.; Tran, T.N.; Swaffield, D.J.; Hällström, J.K.

In: IEEE Transactions on Power Delivery, Vol. 23, No. 1, 2008, p. 3-12.

Research output: Contribution to journalArticleScientificpeer-review

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T2 - A K-factor Filter for the Revision of IEC60060-1 and -2

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AU - Hällström, J.K.

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