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Bias slope of Generator differential relay

Bias slope of Generator differential relay

Bias slope of Generator differential relay

(OP)
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

RE: Bias slope of Generator differential relay

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).

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