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Article | REF: D4755 V2

Medium voltage HTA and high voltage HTB lightning arresters

Author: Frédéric MACIELA

Publication date: May 10, 2008 | Lire en français

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    2. Silicon carbide and spark gap arresters

    At a much higher cost [in HTA (20 kV) ratio of around 3 and in HTB (400 kV) ratio of 100], the lightning arrester avoids most of the disadvantages inherent in the spark gap principle.

    Its advantages over the spark gap are :

    • a much narrower spread of ignition voltage;

    • spontaneous arc extinction;

    • a residual voltage at the arrester's terminals that is non-zero after triggering, thus preventing the transmission of a cut-off voltage wave;

    • insensitivity (up to a point) to external aggressions.

    2.1 Medium-voltage surge arrester

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