what is plug setting multiplier or time setting multiplier

                         plug setting multiplier

~ the ratio of fault current and pickup current of the relay coil is called plug setting multiplier

~ plug setting multiplier = fault current  of relay coil/pickup current = fault current of relay coil/rated current of CT secondary * current setting 

~ suppose plug setting 150% so 

~ratio of CT  500/5 and

~ fault current 3750 A 

~fault current of relay 5*3750/500 = 37.5 

~A and the pickup current 150*5/100=7.5 and

~ plug setting multiplier = 37.5/7.5=5

                       time setting multiplier

~ the relay also has a time setting similar to the current setting.

~ the time at which the relay operates can be adjusted.

~ given the time setting multiplier for this.

~ this dial is calibrated from 0 to 1 in step 0.05 suppose the time derived from the time PSM curve is 4 second and the time setting multiplier is sets to 0.2 the operating time of the relay is 4*0.2=0.8 second 

~ rotating the time setting knob change the distance between fixed contact and moving contact.