ISA T1000 PLUS User Manual page 70

DOC. MIE91093
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The relay detect the loss of field fault when the working point
enters the relay characteristic curve (the circle). The typical
parameters for LOF relays are the following.
K2
K1
K1 : circle diameter; expressed in % of ZN;
K2: offsert; expressed in % of ZN;
VN
ZN 
IN * 3
Rev. 1.34
Reactance
4
0
2 4 6
-4
-8
-12
-16
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Page 70 of 145
Resistance
8 10
Relay Characteristic
Generator Working Point
R