Transformer Testing & Maintenance

Hydrogen Gas in Transformer Oil

Why event-based fault type identification is better than a sample-by-sample approach

Introduction Fault type identification is an important step in dissolved gas analysis (DGA). When a significant amount fault gas production is detected in a transformer,…
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Latest Electrical Industry News

Grounding Transformers Explained

By R. W. Hurst, Editor Grounding transformers are used to provide a path to ground for unbalanced load current and for fault currents on systems…
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pulse graph

Power Transformers Health Check

Power transformers are static electric machines used to step-up or step-down voltage in electric power applications. The capital cost of a power transformer in the…
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DGA graphs

Advancements in Dissolved Gas Analysis: Accounting for Gas Loss

Dissolved gas analysis (DGA) in transformers is a very successful periodic screening method to identify transformers that may be having problems. It is a symptom-based…
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A New Approach to High Voltage Insulation System Testing

Speed is the driving force of successful fault prevention. Early detection of insulation deterioration is key for avoiding asset failure, associated unplanned outages, and physical…
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Distribution Transformer DGA – The Future of Monitoring Distribution Systems

By Leon White and Traci Hopkins, H2scan Corporation As distributed generation, electric vehicle load, and requirements for increased electricity reliability provide real-world challenges for electric…
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Transformer testing and failure analysis

Power Transformer Failures

Electric utilities maximize utilization of their assets, while maintaining reliability. Power transformers are typically reliable, but have been known to fail suddenly and/or prematurely. Transformer…
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transformer repair

Radiator Fin(s) Leak Repair

Radiator fins are notorious for leaking at various locations. One of which is where the fins are attached (welded) to the horizontal bottom-run header. Measurements…
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Transformer Testing & Maintenance Articles

Hydrogen Monitoring in the Transformer Headspace Compared to Traditional In-Oil Monitoring

Hydrogen Monitoring in the Transformer Headspace Compared to Traditional In-Oil Monitoring

By Chris Rutledge, Product Manager, Dynamic Ratings, Inc. Introduction The utilization of online dissolved gas…
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The Dissolved Gas Analysis Toolkit

The Dissolved Gas Analysis Toolkit

Dissolved gas analysis: addressing the challenges of collecting samples BY DONAL SKELLY, GE’s Digital Energy…
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Harmonic Problems in Power Transformers

Harmonic Problems in Power Transformers

Preventing malfunction in power transformers BY ANDY SAGL, Megger Harmonics are another power quality phenomenon…
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The importance of risk assessment and the role of Reliability-based DGA

The importance of risk assessment and the role of Reliability-based DGA

By Chuck Hoeppner, Delta-X Research It’s often said that you can’t manage what you can’t…
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Transformer Oil Regeneration and Corrosive Sulfur

Transformer Oil Regeneration and Corrosive Sulfur

Enervac International ULC has been examining this issue for over 14 years with the help…
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