OMICRON Magazine

Magazine | Issue 1 2020 occurs, which can result in costly asset damage and an unforeseen outage. Why measure partial discharge? PD measurement is the most effective, reliable and non-intrusive dielectric measurement method for early fault detection. It can be performed at any time from the factory to the end of the life cycle. Since PD measurement equip- ment is very sensitive to PD activity, it can effectively identify weak points in the insulation system and help you diagnose the insulation condition of an electrical asset. Types of electrical PD detection There are various methods for mea- suring PD activity during different stages of an electrical asset’s life cycle. Beginning with the development and manufacturing of electrical assets and components, off-line PD measurements are performed with an external high- voltage source during routine and fac- tory testing according to the IEC 60270 standard. These off-line PD measure- ments ensure that the electrical insula- tion meets specific quality and perfor- mance standards before the assembled asset is delivered and connected to the grid. Off-line PD measurements are also performed onsite during manda- tory site acceptance tests in order to ensure that the insulation was not damaged during transport. Function/ feature MPD 800 MONTESTO 200 Permanent Monitoring MONCABLO MONGEMO Off-line diagnosis Standards compliant continuous real time interactive PD measurements (Inception/ extinction voltage, Q(v) diagnostic diagrams)  Advanced tools for noise suppression and PD pattern analysis  On-line diagnosis Real-time measurement and trending for hours to days of Q WTD /Q IEC over time (re-occurring PRPD)   On-line monitoring Trending over weeks to months of Q WTD /Q IEC over time (re-occurring PRPD)   Monitoring over years of Q WTD over time (re-occurring PRPD)  Reporting and alarms System and asset status and alarms   Automatic PD clustering and asset specific reporting (e. g. RotM PatClass)   Measurement report  Interfaces API  Interface to SCADA  21