Bias slope of Generator differential relay

[tsknan]

In Micom P341 relay can any body explain exactly what does the meaning of slope k2(manufacturer reccoments 150% for this setting),normaly we use slope of 0.25 or some thing like that for a differential relay,but here the value is some what confusing,please clarify,how we can draw the chjaracteristics
settings: Is1=60ma,Is2=1A,K1=0,K2=150%,CTR 2500/1 for both side CTs used in generator protection of 23MVA hydro Generator,1A nominal current

 

[DiscoP]

K2 is a second slope, it is meant to add stability should a CT start to saturate.

The second slope is active when the bias current is above the Is2 setting.

25% is a typical slope 1 (K1) setting for a transformer differential relay to account for spill current introduced by the tap changer (mainly).