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Summary

This 59-minute DVD covers the basic principles of operation of pad-mounted transformers and switchgear, the types of equipment that are in common use, and how they are connected. It also presents the basic principles of pad-mounted transformer and switchgear inspection and troubleshooting, and shows an example of how to detect a problem with one leg of a three-phase transformer.

• Pad-Mounted Transformers – 12 minutes
  Describes the general construction and features of a pad-mounted transformer.
• Pad-Mounted Transformer Installation – 7 minutes
  Describes an installation procedure for a three-phase, pad-mounted transformer that includes the following steps: site preparation, transformer installation, and testing.
  
• Troubleshooting a Three-Phase Transformer, Part 1 – 13 minutes
  Defines and describes the symptoms of: one leg open, ferroresonance, off-ratio winding, and open neutral.
  
• Troubleshooting a Three-Phase Transformer, Part 2 – 6 minutes
  Demonstrates how the troubleshooting process can be used to isolate the cause of a problem in a three-phase, pad-mounted transformer.
• Pad-Mounted Switchgear – 11 minutes
  Identifies two types of pad-mounted switchgear. Describes the use of pad-mounted switchgear to sectionalize and isolate a URD system. Describes typical physical and operational checks for pad-mounted switchgear.
• Pad-Mounted Switchgear Operation – 8 minutes
  Demonstrates the use of pad-mounted switchgear to sectionalize and isolate equipment in an underground feeder system.

Support Materials Available

Student workbook, instructor guide.