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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Silicon carbide and spark gap arresters
Zinc oxide arresters
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