Answer Posted / msivakailash85
tsm:(Time setting multiplier)
it is multiplier of various time current characteristics
curves(i.e.normal inverse,extreme inverse,long inverse,very
long inverse,..etc)
psm(plug setting multiplier)
The relay's primary winding is supplied from the power
systems current transformer via a plug bridge, which is also
commonly known as the plug setting multiplier (psm)
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