Pad-Mounted Transformers and Switchgear

SKU: TDPMT00CENDuration: 60 Minutes

The purpose of this course is to teach 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. The course 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. At the conclusion of this course, participants should be able to state how pad-mounted transformers and switchgear are used and to describe how they are connected. They should be able to recognize and identify commonly used types of pad-mounted transformers and switchgear. They should also be able to inspect pad-mounted transformers and switchgear, and they should be able to detect a problem with one leg of a three-phase transformer.

Course Details


Training Time: 60 minutes

Compatibility: Desktop Only

Based on: Industry Standards and Best Practices

Languages: English

Learning Objectives

  • Pad-Mounted Transformers
  • Describe the general construction and features of a pad-mounted transformer.
  • Pad-Mounted Transformer Installation
  • Describe 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
  • Define "one leg open" and describe its symptoms.
  • Define "ferroresonance" and describe its symptoms.
  • Define "off ration winding" and describe its symptoms.
  • Define "open neutral" and describe its symptoms.
  • Troubleshooting a Three-Phase Transformer, Part 2
  • Describe or demonstrate how the troubleshooting process can be used to isolate the cause of a problem in a three-phase pad-mounted transformer.
  • Pad-Mounted Switchgear
  • Identify two types of pad-mounted switchgear.
  • Describe the use of pad-mounted to sectionalize and isolate a underground residential distribution (URD) system.
  • Describe some typical and operational checks for pad-mounted switchgear.
  • Pad-Mounted Switchgear Operation
  • Describe or demonstrate the use of pad-mounted switchgear to sectionalize and isolate equipment in an underground feeder system.
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