Propane and propylene appear in the standard that defines how to measure DGA gases — not in the standards that define how to interpret them. Here is what IEC 60599:2022 §5.8 really says about C3.
IEC 60422 sets transformer oil test frequency by equipment category and risk. Its scope also excludes dissolved gas analysis, which is where a schedule stops being enough.
One number, ±15%, is quoted worldwide — but IEC, ASTM, IEEE, Russian and Chinese standards each define accuracy differently. Here is what each one demands.
DGA in ester transformers now has a dedicated interpretation guide: IEC 63585:2026. Why mineral-oil rules mislead on esters, and where hydrogen monitoring still fits.
Stray gassing in transformer oil: why hydrogen and methane form at low temperature without a fault, and how to keep DGA alarms honest with ASTM D7150.
Laboratory gas standards anchor every dissolved gas reading. See how certified reference gases, ISO 17034 materials and field calibration keep transformer oil testing trustworthy.
A global DGA standards compliance map: IEC 60567 for measurement, IEC 60599 and IEEE C57.104 for interpretation, GB/T 7252 and DL/T 722 for China.
Understand DGA monitor certification: what each type of third-party evidence covers — performance-grade evaluation, technological appraisal, quality-system audit, and metrological verification — and how to read the certificates.
IEC 62443 in practice for online DGA: zones and conduits, least privilege, TLS encryption, firmware signing, audit logging, and data governance that preserves trends.
IEC 60599:2022 classifies transformer faults into six types: PD, D1, D2, T1, T2, T3. This guide explains each fault type, its energy band and signature gases.
