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Mod 4 • CT Saturation
Push a current transformer past its limits and see how saturation distorts secondary current and misleads protective relays.
System Inputs
Not Saturated
Tip:
Below knee, secondary tracks the primary (referred to secondary). Above knee, the tops flatten and distortion starts when X/R is high.
Current Waveforms (Secondary Amps)
Primary referred to secondary
Secondary actual
Tip: Increase X/R to add a decaying DC offset. Increase Burden or lower Knee to force saturation.
Excitation Curve (V vs Iexc)
Dot follows the curve
V demand (peak): 0 V
Knee: 150 V
Isec (ideal RMS): 0 A