Answer / nilamani

if we will operate the CT in open circuit then due to heavy
magnetising current due to primary winding will effect the
saturation ll be affected.

Answer / tameshwar singh

The CT saturation occurs when secondary winding is kept
open. At this time there is no demegnatising current flows
in secondary winding and due to this primary winding will
carry very high megnatising current.As the high megnatising
current produces high megnatic flux which causes the CT
core saturation

Answer / santhosheee

Normally Protection CT will designed by some saturation
level ie Knee Point Voltage. its depepending upon the
protection level. for example if any fault the voltage will
build up in the CT because its transfomer.according to
fault level the manufacturer designing the CT with some
saturation level. If any heavy fault Like lightning,( some
time substation system will affect heavy lightning ) may
be that time and above knee point voltage the CT will be
saturate. its like a short circuit in the CT winding. so
flash over may occur in the CT.

plz explain TSM and PSM.with example suppose ct ratio is 4000/5 and tsm is .15 and plug is at 3.75 if fault current is 8000A.so how i find relay oprating time.

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