Transformer Diagnostic Bulletin
The mission of the Transformer Diagnostic Bulletin is to provide a collection of unbiased technical documents (i.e. guides, PowerPoints, and papers), all relating to transformer testing. The Bulletin is always available to both customers and non-customers.
Keep in mind that the latest Bulletin includes all the material shared in the most recent and past Bulletins.
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Featured Case Studies
Collection of Transformer Case Study Issues
Within this presentation, you will find a nice new collection of transformer case studies that show the common fault patterns on transformers. The presentation includes over 20 case studies on insulation failures, tap changer failures, gassing, and moisture issues. All issues were identified with electrical diagnostic tests.
Past Material
Technical Papers
- NETA Article: Best Practices for Ratio Verification of Power Transformer CTs
- Brandon’s Notes on Different Transformer Types
- A Transformer Testing Toolbox: Troubleshooting Checklists, Test Plans, and Analysis Tips
- A Systematic Approach to High-Voltage Circuit Breaker Testing
- Three Tips for Reducing Wasted Time When Testing Transformers
- A Guide for Using PTM and the CIBANO 500 to Test Circuit Breakers in North America
- NETA World Spring 2019 - The Value of Performing Power Factor Sweep Measurements
- The Value of Performing Power Factor Sweep Measurements on Bushings – Revision #1
- An Introduction to Electrical Diagnostic Testing of Power Transformers
- Obstacles Associated with Winding Resistance Measurements of Power Transformers
- A Systematic Approach to Analyzing Exciting Current Measurements on Power Transformers
- Applying SFRA and Leakage Reactance to Determine Mechanical Faults in Transformers
Application Guides
- A Guide for Performing the Anti-Pump relay check with the CIBANO 500
- A Guide for Using PTM and the TESTRANO 600 to Test Transformers
- A Guide for Using PTM and the CPC 100 to Test Transformers
- Guide for Using PTMate
- A Guide for Power Factor Testing CCVTs, PTS, and HVCTs
- CCVT, PT, and HVCT Power Factor Test Templates
Technical Slides