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What is CT Polarity and Star Point Analysis about?

The document discusses current transformer (CT) polarity for differential protection relays. It explains that the CT secondary terminals towards the protected equipment should be connected together, and the terminals away should also be connected together. This ensures that for external faults, no current flows through the relay, while for internal faults the relay sees a differential current and operates. Connecting the CTs in reverse polarity could cause the relay to operate incorrectly - it may operate f

Author

Tamjid

Language

EN