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BSI BS EN 60099-8:2011

Surge arresters -- Metal-oxide surge arresters with external series gap (EGLA) for overhead transmission and distribution lines of a.c. systems above 1 kV
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BSI BS EN 60099-8:2011

Surge arresters -- Metal-oxide surge arresters with external series gap (EGLA) for overhead transmission and distribution lines of a.c. systems above 1 kV

PUBLISH DATE 2011
PAGES 66
BSI BS EN 60099-8:2011

This part of IEC 60099 covers metal-oxide surge arresters with external series gap (externally gapped line arresters (EGLA) that are applied on overhead transmission and distribution lines, only to protect insulator assemblies from lightning-caused flashovers.

This standard defines surge arresters to protect the insulator assembly from lightning-caused overvoltages only. Therefore, and since the metal-oxide resistors are not permanently connected to the line, the following items are not considered for this standard:

  • switching impulse sparkover voltage;

  • residual voltage at steep current and switching current impulse;

  • thermal stability;

  • long-duration current impulse withstand duty;

  • power-frequency voltage versus time characteristics of an arrester;

  • disconnector test;

  • aging duties by power-frequency voltage.

Considering the particular design concept and the special application on overhead transmission and distribution lines, some unique requirements and tests are introduced, such as the verification test for coordination between insulator withstand and EGLA protective level, the follow current interrupting test, mechanical load tests, etc.

Designs with the EGLA's external series gap installed in parallel to an insulator are not covered by this standard.

SDO BSI: British Standards Institution
Document Number EN 60099-8
Publication Date June 30, 2011
Language en - English
Page Count 66
Revision Level
Supercedes
Committee PEL/37
Publish Date Document Id Type View
June 30, 2011 BS EN 60099-8:2011 Revision