Methods for current transformer testing

Traditional current transformer testing follows a black-box approach. The current transformer is solely assessed through its external behavior without considering what is happening inside. Three such black-box testing methods exist, differing in their comprehensiveness and the effort they involve: primary-current injection using a portable high-current source; secondary-voltage injection using a portable variac; primary-nominal current injection using a high-current source, a reference current transformer, a burden simulator and a bridge. CT Analyzer opens the black box through secondary injection with variable frequency and a patented low-voltage, low-frequency method for excitation measurement.
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