Power Transformer Technologies Nov 2023

45 minutes presentation includes 10 minutes of Q&A.  

1:00 pm - 1:45 pm
Zensol Automation Inc.
Vibro-Acoustic as a Fast Diagnostic Tool for On Load Tap Changers
The functioning of an On-Load Tap Changer (OLTC) is complex, since a lot of mechanisms are operating at the same time. Classic testing techniques give very little information on mechanical problems occurring inside an OLTC while in service. This presentation shows how the vibroacoustic method is used as a fast diagnosis tool to easily detect mechanical problems in Tap Changers ON-LINE or OFF-LINE, before they create an outage. We will show also how simultaneous correlation of signals recorded by Vibroacoustic, Motor Current and Dynamic Resistance Measurement (DRM) allows a fast understanding of the internal movements of an OLTC. Each of these tests provides a piece of information that creates a complete picture of the OLTC's condition. Finally, we will present a real case showing how the electric utility New Brunswick Power uses this tool to properly adjust an OLTC.

1:45 pm - 2:30 pm
Dynamic Rating
Analyzing Waveform Capture
This webinar will examine the different types of waveforms captured through both online monitoring and offline testing of circuit breakers. Using data collected from the field, several examples of breaker mis operation will be discussed. Also, there will be training provided as to the analysis of these waveforms and how they relate to mechanical components of the circuit breaker.

2:30 pm - 3:15 pm
Intellirent
Causes and Detection of Mechanical Failures in Power Transformers
One of the more common causes of mechanical failure in power transformers comes from exposure to through faults. Most of today’s transformer protective relay systems provide comprehensive monitoring of these potentially damaging events but are rarely activated. In this presentation we will define the characteristics of a through-fault, investigate various proper settings for a through-fault monitor, and present an actual case study of a severely damaged transformer exposed to this condition. We will also present examples of detecting mechanical failure in the transformer as it relates to a through-fault condition.

3:15 pm - 4:00 pm 
Transformer Services at Kinectrics, Inc
Moisture Management in Power Transformers

We will examine the impact of moisture residing in the insulation system of a power transformer.   Sources of moisture in transformers will be identified, and the effect of this moisture on the operation and lifespan of the transformer will be examined.   We will address the issue of how the moisture content in transformers is measured or estimated.   Finally, when the presence of excess moisture in a transformer has been positively identified, the methods used in the field to remove moisture from the transformer insulation will be reviewed, noting that the removal of moisture from the paper insulation is much more difficult than simply drying the oil.