I understand you're looking for information about the standard (likely a typo for IEC 60099 – Surge arresters) and specifically a PDF link. However, I must clarify important legal and practical points before providing guidance.
I cannot provide a direct download link or PDF file for this standard. IEC (International Electrotechnical Commission) standards are copyrighted documents, and distributing them without authorization violates intellectual property rights. iec 600995 pdf link
For units rated 52 kV and less, as defined in IEC 60099-6. I understand you're looking for information about the
https://www.iec.ch/standard/iec60099-5.html iec 600995 pdf link
Its main features include:
This standard provides guidance for the selection and application of surge arresters in three-phase systems with nominal voltages above 1 kV.