Answer / Rajkumar Gupta

The knee point in the CT (Current Transformer) magnetizing curve represents the transition from linear to non-linear behavior. The three main stages are:
1. Linear region: Below the knee point, the current transformer behaves linearly, and the primary current is directly proportional to the secondary current.
2. Knee point: At this point, the magnetic core saturates, and the secondary current begins to increase at a faster rate than the primary current.
3. Non-linear region: Above the knee point, the current transformer exhibits non-linear behavior, and the secondary current does not accurately represent the primary current.

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