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. and Hallstrom, J.K. (2008) Zero phase filtering for lightning impulse evaluation: a K-factor filter for the revision of IEC60060-1 and-2. IEEE Transactions on Power Delivery, 23, (1), 3-12. (doi:10.1109/TPWRD.2007.911124).


[img] PDF
Restricted to Registered users only

Download (561Kb) | Request a copy


The next revision of the international standard for high voltage measurement techniques, IEC 60060-1, is 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 non-causal 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 optimisation 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.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1109/TPWRD.2007.911124
ISSNs: 0885-8977
Divisions : Faculty of Physical Sciences and Engineering > Electronics and Computer Science > EEE
ePrint ID: 263459
Accepted Date and Publication Date:
January 2008Published
Date Deposited: 15 Feb 2007
Last Modified: 31 Mar 2016 14:07
Further Information:Google Scholar

Actions (login required)

View Item View Item

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics