CT Application and Construction – 7 minutes
States the functions of a current transformer. Describes common current transformer applications in a substation. Describes the construction of common substation current transformers.
CT Accuracy Class and Operation – 11 minutes
Explains the meanings of CT accuracy class ratings. Describes the basic operation of a current transformer. Explains saturation in a CT core. Describes a CT’s turns ratio and current ratio as they relate to the CT’s current and voltage output.
Polarity Testing: DC Kick Method – 9 minutes
Explains why the polarity of a current transformer is checked. Describes the DC kick method of checking the polarity of a current transformer.
Polarity Testing: Current Method – 7 minutes
Describes the current method of checking the polarity of a current transformer.