(defined in IEC 60099-4).
This article is for informational purposes only. Standard numbers and edition statuses change. Always refer to the latest IEC catalog for definitive validation.
Applies to gapless metal-oxide arresters ( IEC 60099-4 ), gapped designs for 52 kV and below ( IEC 60099-6 ), and externally gapped line arresters (EGLA, IEC 60099-8 ).
The most exciting development is the creation of a brand-new part of the standard: iec 600995 pdf upd
instead of traditional line discharge classifications. For more details, visit IEC Webstore . IEC 60099-5:2018
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To ensure you are working with the absolute latest, verified, and legally compliant version, you should acquire the document directly from authorized distributors: (defined in IEC 60099-4)
Including series and parallel gapped arresters rated ≤is less than or equal to 52 kV per IEC 60099-6 .
Old Classification System (Edition 2.0 / 2013) └── Line Discharge Classes (Classes 1 to 5) New Classification System (Edition 3.0 / 2018 Update) └── Thermal Energy Dissipation & Charge Transfer (Qrs / Qth) The Transition to Charge Classification Go to product viewer dialog for this item.
: Addressed in Annex J to assist engineers managing older infrastructures built with traditional gapped surge devices. Critical Updates in the Latest Revision Always refer to the latest IEC catalog for
Provides recommendations for insulation coordination and protecting equipment like transformers and shunt capacitor banks. :
The latest major update to IEC 60099-5 (Part 5: Selection and application recommendations) is the third edition (2018)
Provides step-by-step procedures to align arrester residual voltage with system insulation levels. Line Switching
must be selected to be greater than or equal to the highest actual continuous operating voltage expected across the arrester. In typical phase-ground applications, this is calculated using the formula: (where Uscap U sub s represents the highest system voltage). 2. Rated Voltage ( Urcap U sub r The rated voltage ( Urcap U sub r
Having the latest is crucial for electrical designers, manufacturers, and utility engineers. As systems evolve to incorporate more renewable energy sources, the risk of switching surges increases.