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Before selecting an arrester, the user must define the environmental and electrical environment. IEC 60099-5 outlines how to account for:
This is the core mathematical exercise of the standard. It provides calculations to determine: Continuous Operating Voltage ( Uccap U sub c
Arresters also act as mechanical stand-offs. The standard provides guidance on: iec 600995 pdf
Standards are updated periodically to account for new grid technologies (such as renewable energy integration and HVDC systems). Ensure you are looking for the latest edition of IEC 60099-5. Relying on an obsolete version may lead to incorrect insulation coordination calculations. 2. Avoid Unauthorized and Pirated PDF Downloads
We can delve deeper into the for continuous operating voltage ( Uccap U sub c
: The dominant technology deployed in modern substations, adhering fundamentally to IEC 60099-4. Most countries have an IEC national committee (e
The most current version is the , published as IEC 60099-5:2018 . Key Technical Scope
Websites offering "free PDF downloads" for copyrighted, in-print standards are almost always pirate sites. Using them is a legal risk for you or your organization. Some parts are also protected by DRM, requiring a plugin like FileOpen to view, and they often embed a digital watermark identifying the purchaser.
Check the grounding configuration of the network (effectively grounded vs. ungrounded). Select the arrester Uccap U sub c Urcap U sub r based on TOV curves. Define required charge transfer ratings ( Qrscap Q sub r s end-sub Qthcap Q sub t h end-sub ) based on switching study data. IEC 60099-5 outlines how to account for: This
The IEC 60099 series is divided into multiple parts, each covering a specific type of surge arrester or application.
Aligned with modern updates, arresters are classified by the maximum amount of electrical charge they can absorb during a single thermal event without exceeding their structural thermal limits. This metric ensures the device will not experience thermal runaway under stress. Step-by-Step Surge Arrester Selection Process
) are compatible with the system’s maximum voltage and earthing practices. Protection Level Calculation:
The Shift From Line Discharge Classes to Charge Classification
Metal-oxide surge arresters without gaps (primarily covered in modern editions). Metal-oxide surge arresters with internal series gaps. Applications in alternating current (AC) power systems.