access icon openaccess Electrical field distribution of 35 KV Igla under polluted and ice-covered situation at power frequency

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 29/08/2018, Accepted 24/09/2018, Revised 21/09/2018, Published 26/10/2018

Lightning striking on power system may lead to severe accident and huge losses, which is the reason why line arresters are needed. During operation, the electrical field concentration in line arrester may lead to ablation and accelerated aging of insulation materials, and furthermore, cause mal-operation. A type of line arresters with internal series air gap (IGLA) is chosen by this study, which is distinguished from the previously used metallic oxide arrester, with better characteristic on anti-flashover when icing, but with worse characteristic on anti-flashover when polluted. This paper aims at studying the probable variation of power-frequency electric field of this new kind of IGLA under polluted and icing situation, and making further analysis on the reason why the electric field strength change like this.

Inspec keywords: lightning; ice; air gaps; ageing; electric fields; flashover; arresters; lightning protection

Other keywords: electric field strength change; power frequency; line arrester; huge losses; electrical field concentration; power-frequency electric field; mal-operation; metallic oxide arrester; Igla; anti-flashover; polluted ice-covered situation; IGLA; electrical field distribution; icing; severe accident; voltage 35.0 kV; power system; internal series air gap

Subjects: Power line supports, insulators and connectors; Reliability; Protection apparatus

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