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Answer Posted / pradeep vaish
Instrument Security Factor is the ratio of Instrument Limit
Primary Current to the rated Primary Current. Instrument
Limit Current of a metering Current Transformer is the
maximum value of primary current beyond which Current
Transformer core becomes saturated. Instrument Security
Factor of CT is the significant factor for choosing the
metering Instruments which to be connected to the secondary
of the CT. Security or Safety of the measuring unit is
better, if ISF is low
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