BS EN IEC 60099-8:2018 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 document defines surge arresters to protect the insulator assembly from lightning-caused over-voltages only. Therefore, and since metal-oxide resistors are not permanently connected to the line, the following items are not considered for this document:

• switching impulse spark-over 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 document.


Cross References:
ISO 4892-1
EN ISO 4287
EN 62217 (IEC 62217:2012) AS
IEC 60068-2-11:1981
IEC 60060-1:2010
EN 60099-4:2004
IEC 62217:2012
EN 60060-1 (IEC 60060-1:2010) AS
EN 60507 (IEC 60507:2013) AS
EN 60270 (IEC 60270:2000 Adopted)
IEC 60068-2-14:2009
IEC 60507:2013
EN 60068-2-14 (IEC 60068-2-14:2009) AS
IEC TS 60815-1:2008
IEC 60270:2000
IEC 60060-2:2010
EN 60060-2 (IEC 60060-2:2010) AS
EN 60068-2-11 (IEC 60068-2-11 Adopted)
IEC 60099-4:2014
EN ISO 4892-3
EN ISO 4892-2
ISO 4892-2
EN ISO 4892-1
ISO 4892-3
ISO 4287
EN ISO 3274
IEEE C62.11
ISO 3274


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