Transformers, Unit 2

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Code: TF2A
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Summary

This 54-minute DVD explains the principles of transformer inspection, maintenance, and testing. It shows how to perform a visual inspection; gas and oil testing; power transformer de-energizing, isolating and grounding; tap changer maintenance; turns ratio testing; and insulation resistance testing.

Training Sessions

Visual Inspection – 9 minutes
Lists the typical items checked during an inspection of a transformer’s exterior condition, sealing system, and cooling system.

Gas and Oil Testing – 8 minutes
Shows how to test: the gas in a power transformer for combustible gas, the gas in a power transformer for oxygen, and the insulating strength of the oil in a power transformer.

Tap Changers – 10 minutes
Explains what a tap changer is. States the function of a no-load tap changer and briefly describes how a typical no-load tap changer works. States the function of a load tap changer and briefly describes how a typical load tap changer works.

Tap Changer Maintenance – 3 minute
Identifies the steps for de-energizing, isolating, and grounding a power transformer. Lists the items typically included in a maintenance check of the physical condition of a load tap changer. Lists the items typically included in a maintenance check of the mechanical operation of a load tap changer. Lists the items typically included in a maintenance check of the electrical operation of a load tap changer.

Turns Ratio Test – 7 minutes
Explains how to test a transformer’s turns ratio.

Insulation Resistance Test – 14 minutes
Explains how to test a transformer’s insulation resistance.

Support Materials Available

Student workbook, instructor guide.