CT Grounding practices- CTs must be grounded at a single point- Why?

The CTs must be grounded at the single point. The grounding of the CTs at the multiple points lead to the voltage of different magnitude at two points. The realy used for the differential protection may operate when the fault is outside of the protection zone.

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https://sdvelectrical.blogspot.com/2018/11/current-transformer-secondary-grounding.html?m=1

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