Transformer Applied Maintenance
Provides a complete foundational understanding of the internal and external elements of the transformer, and the critical fundamentals of transformer operation and maintenance. This course covers the electrical, mechanical and chemical components of the transformer, the purpose and operating characteristics of these components, and the fundamental requirements and methods for maintenance.
You will have four days of required learning consisting of multiple education formats such as classroom instruction with introductory case study analysis, practical application exercises, group discussions, break-out activities, lab and equipment tours, as well as interactive TTR demonstration and learning. You will be able to add an additional class (elective) of your choice that is specific to a topic, piece of equipment, or area of expertise.
You will participate in the planning of an effective transformer maintenance program and will have the tools to continue or improve the implementation of such a program at your organization. You will review oil analysis test reports, understand the significance of the results, and evaluate the validity and applicability of interpretations supplied by the laboratory.
Participation in practical exercises, activities, and case study analysis performed in class will equip you in determining next steps when analyzing oil and electrical test results.
- Interactive Transformer Learning Lab
- Diagnostic & Analytical Lab Tour
- Introductory tour of repair / rewind facility
SESSION ONE: TRANSFORMER BASICS
- Why do we use transformers?
- War of the Currents
- Power Delivery System
- Transforming Voltage by Induction
- Materials and Construction
SESSION TWO: SOLID INSULATION LIFE AND AGING
- Mechanical Forces on the Core and Coils
- Insulation Aging and Mechanical Strength
- Conditions that Age Solid Insulation
SESSION THREE: INSULATING LIQUIDS
- The Four Functions of Insulating Liquids
- Oil Aging Process
- What Accelerates the Aging Rate?
- New Oil Issues
- Alternate Fluids
SESSION FOUR: STANDARDS, REGULATIONS, & NEW TECHNOLOGIES
- Standards & Standards Organizations
- Regulation of the Utility Industry
- Renewable Energy
- Smart Grid
- Case Studies
SESSION FIVE: TESTING INSULATING LIQUIDS
- Transformer Failure Modes
- Visual Inspection and Sampling
- What Tests and When
- Test Methods
SESSION SIX: MOISTURE IN TRANSFORMERS
- What are the Basic Issues?
- What Is Important to Know?
- Percent Saturation
- Percent Moisture by Dry Weight
SESSION SEVEN: DISSOLVED GAS ANALYSIS
- Basic Issues
- Sampling for DGA
- Test Method for DGA
- DGA Interpretation
- Qualitative Method – Key Gas Analysis
- Interpretations Guidance Standards
- Key Gas Example
- Quantitative Methods
- Case Studies
SESSION EIGHT: ANALYSIS FOR FURANIC COMPOUNDS
- Breakdown of Cellulose
- Test Methods
- Interpreting Results
- Using Furan Content to Calculate DP and Life Remaining
SESSION NINE: ELECTRICAL TESTING
- Factory Electrical Testing
- Acceptance Testing
- Routine and Diagnostic Field Electrical Testing
- Field Electrical Testing Safety
- Infrared Thermography
SESSION TEN: INTERPRETING OIL TEST RESULTS & SERVICE RECOMMENDATIONS IN MINERAL-OIL-FILLED TRANSFORMERS
- Early Attempts at Industry Guidance
- SD Myers, Inc. and IEEE Efforts
- Color Guide
- IEEE Standards
- Development of Current SD Myers System
- Scanning Electron Microscope (SEM) Photomicrographs
- Transformer Oil Testing Criteria
- Case Studies
- Interpretation Reports and Case Studies
SESSION ELEVEN: APPLIED TRANSFORMER MAINTENANCE
- Transformer Maintenance Overview
- Maintenance Priorities
- Issues and Procedures for Mechanical Maintenance
- Issues and Procedures for Electrical Maintenance Needs
- Issues and Procedures for Chemical Maintenance Needs
- Factory Dry Out
- Field Dry Out Options
- Maintenance Practices for Oil Aging
- Field Equipment
- Maintenance Planning
- Service Contractors
SESSION TWELVE: TRANSFORMER ASSESSMENT AND WRAP-UP
- Introduction to Asset Management
- Managing the Asset Lifecycle
- Risk Based Asset Management
Advanced DGA Diagnostics
Advanced perspective on how dissolved gas analysis (DGA) results are interpreted – an important tool in the overall transformer maintenance program. Includes hands-on break out groups.
This class is intended to identify fault gases and what causes their formation; explain and provide examples of qualitative and quantitative interpretation of dissolved gasses. This class will also evaluate the condition of cellulose insulation and other non-routine tests, examine the role DGA plays in new oil testing and discuss procedures to obtain a representative sample from transformers, and how to mitigate risk.
Attendees are encouraged to bring their own transformer data to use as a case study for interpretation of dissolved gases or to help develop a maintenance program.
- Maintenance and Sampling Oil
- Introduction to Oil Testing
- Dissolved Gas Analysis
- Non-Routine Oil Analysis
- Group Workshop on DGA Case Studies
In-Service Inspection & Sampling of Fluid-Filled Transformers
Learn how to properly inspect and safely obtain fluid samples from energized electrical transformers.
This class is for substation personnel whose responsibilities include sampling and monitoring the overall condition of fluid filled transformers.
- Special Care Transformers
- Transformer Part & Visual Inspection
- Inspection Forms/Nameplates/Gauges
- Sampling Containers
- Proper Sampling
- Nitrogen Blanket
- Why Oil Test
- The importance of monitoring the insulation