Failure aspects of electronic watt-hour meters due to direct lightning strikes to distribution lines - Electromagnetic disturbance caused by lightning current flowing through watt-hour meters and its countermeasure-

Kazuyuki Ishimoto, Ryota Mori, Akira Asakawa, Yoshimichi Ohki

    Research output: Contribution to journalArticle

    Abstract

    Recently, advanced "smart meters" have been introduced widely to electric power distribution lines. Since smart meters consist of many low-voltage electronic devices, their vulnerability to disturbances such as lightning surges is a matter of concern. Therefore, to establish an effective lightning protection countermeasure against these disturbances, we have been investigating the lightning failure aspects of electronic watt-hour meters (WHMs), which have a function similar to that of a watt-meter section in smart meters. In this paper, we explored countermeasures for improving the performance of WHMs against the lightning transient magnetic fields. At first, we examined the performance of WHMs by lightning impulse current tests. As a result, it has become clear that the increase in distance between a bus conductor and a processing unit and magnetic shield of a processing unit are effective in reducing the probability of failures caused by the transient magnetic fields. Next, we proposed a calculation method of the lightning failure rate of WHMs based on a lightning surge analysis. The calculation results indicate that the failure occurs more frequently by subsequent strokes than by first strokes or if the grounding resistance of a pole transformer is higher.

    Original languageEnglish
    Pages (from-to)766-776
    Number of pages11
    JournalIEEJ Transactions on Power and Energy
    Volume137
    Issue number12
    DOIs
    Publication statusPublished - 2017 Jan 1

    Keywords

    • Distribution lines
    • Failure rate calculation
    • Lightning protection countermeasure
    • Smart meter
    • Transient magnetic field

    ASJC Scopus subject areas

    • Energy Engineering and Power Technology
    • Electrical and Electronic Engineering

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