Testing and Maintaining Power Transformers

Designed to provide the latest information on maintenance and testing of pad- mounted power and distribution transformers and insulating liquids. This hands-on course provides detailed testing procedures and operational cautions technicians must have when performing field- testing of transformers. This course covers oil and dry-type transformers used in most commercial and utility-type installations. Beginning with safety, the course progresses through components, nameplate data, de and ac testing, routine inspections, oil sampling and testing, all of which are covered in detail. Students will perform routine oil tests and all major electrical tests typically performed in the field.

Course Description: Designed to provide the latest information on maintenance and testing of pad- mounted power and distribution transformers and insulating liquids. This hands-on course provides detailed testing procedures and operational cautions technicians must have when performing field- testing of transformers. This course covers oil and dry-type transformers used in most commercial and utility-type installations. Beginning with safety, the course progresses through components, nameplate data, de and ac testing, routine inspections, oil sampling and testing, all of which are covered in detail. Students will perform routine oil tests and all major electrical tests typically performed in the field.

Prerequisites: Students should have basic electrical training, some field experience.

Course Learning Objectives:

• Describe the major categories and the most common designs of transformers
• Identify power, instrument & distribution transformer components and auxiliary equipment
• Demonstrate routine and diagnostic inspections and point out potential problems/hazards
• Interpret nameplate data and use the data to set up correct test procedures
• Simulate appropriate tests to evaluate the condition and perform maintenance on transformers
• Discuss oil sampling and the correct procedures to obtain samples.
• Summarize testing, drying, filling and filtering techniques and procedures
• Explain gas sampling and testing
• Discuss test results to troubleshoot transformer
• Determine the dryness of insulation using safety precautions, proper tools, vendor manuals and/or drawings.