NETA Fall 2019 whats in a monitoring system
25 May 2021
William G. Higinbotham
Partial discharge (PD) testing is becoming common in U.S. industrial systems and is gaining acceptability in U.S. utilities. Testing in the form of periodic surveys can provide valuable insight into asset condition. Beyond periodic surveys, full-time system monitoring is the state of the art in PD detection, offering additional capabilities that:
• Warn of rapidly evolving PD situations
that might go from inception to failure
faster than a periodic survey interval.
• Allow trending of slowly evolving data to
better confirm real degradation.
• Allow trending with external events such as
load charges or environmental changes.
• Provide better data than periodic surveys
through additional sensors or time-offlight fault location.