Demagnetizing a Current Transformer – 7 minutes
Explains why it may be necessary to demagnetize a current transformer. Describes the basic steps for demagnetizing a current transformer.
Ratio Testing: Current Method – 8 minutes
States the purpose of current transformer ratio testing. Describes the current method of checking the ratio of a current transformer.
Ratio Testing: Voltage Method – 10 minutes
Describes the voltage method of checking the full winding ratio of a CT. Describes the voltage method of checking the tapped winding ratios of a CT.
Insulation Resistance Testing – 8 minutes
Explains the purpose of testing current transformer insulation resistance. Describes the basic steps for testing the insulation resistance of a current transformer. Describes how to correct insulation resistance readings for temperature.