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Training Sessions

Isolating Transformer Faults
Isolating Cable Faults, Part 1
Isolating Cable Faults, Part 2
Training Sessions

Isolating Transformer Faults – 9 minutes
Describes the layout of a typical underground residential distribution system. Describes how to troubleshoot a transformer fault in which only the transformer primary fuse is blown. Describes how to troubleshoot a transformer fault in which the riser pole fuse is blown but the transformer primary fuse is intact.

Isolating Cable Faults, Part 1 – 10 minutes
Describes how to troubleshoot a cable fault in a system equipped with cable fault indicators. Identifies three common types of cable fault indicators. Describes how to troubleshoot a cable fault by isolating and testing one section of cable at a time starting at the normally open point in the loop. Describes how to troubleshoot a cable fault by isolating and testing one section of cable at a time starting at a blown riser pole fuse.

Isolating Cable Faults, Part 2 – 10 minutes
Describes how to troubleshoot a cable fault by re-energizing one section of cable at a time. Describes how the area to be isolated and tested for a cable fault in a URD system can be reduced. Describes the major difference between troubleshooting a transformer fault or a cable fault in a three-phase system and troubleshooting a transformer fault or a cable fault in a single-phase system. Describes how to troubleshoot a cable fault using a radar fault locator.