Surge arresters gapped

Transient condition as in Table 18.1 Protection level of a gapped surge arrester Protection level of a gapless surge arrester ... 

The current limiting gaps, as noted above, in series with the non-linear resi.stors make it possible to adjust the protection level of the surge arrester for different values of discharge currents. They also help to maintain... 

Surge arrester - Non-linear resistor type gapped 3070-1/1990 BS EN 60099-... 

ANSI/IEEE-C62.1/1994 Standard for gapped silicon carbide surge arresters for a.c. power circuits ... 

ANSI/IEEE-C62.2/1994 Guide for application of gapped silicon carbide surge arrester for a.c. systems ... 

Surge arresters - Metal oxide surge arresters without gaps for a.c. systems 3070-3/1993 BS CN 60099-4/1993... 

Surge arrester application is beyond the scope of this appendix. However, if the employer installs the arrester near the work site, the application would be similar to the protective gaps discussed in paragraph IV.D of this appendix. 

One type of arrester consists of a porcelain cylinder filled with some suitable material with electrodes at either end. The series gap assembly is usually at the top. In another type of arrester, called the expulsion type, there are two series gaps, one internal and one external. During a voltage surge, these gaps have to be bridged. Another gap formed between two internal electrodes and placed between two internal electrodes is assembled inside a fiber tube that functions as the valve element and serves to resist the flow of line... 

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