how can we connect a distance relay to CT core that is for backup protection

how can we connect a distance relay to CT core that is for
backup protection or metering?

Question Posted / manu

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how can we connect a distance relay to CT core that is for backup protection or metering?..

Answer / k.prakashchandra

You can not use metering ct as the it does not measure
current beyond 150% 0f rated.You can connect terminals of
diff relay in series with back-up relay.

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