ABB Relion 670 Series Technical Reference Manual page 371

1MRK505222-UUS C
Imin > 0.10 IBase
Vcosj < 0.92 VBase
0.2 £ Slip.Freq. £ 8 Hz
d ³ startAngle
Z cross line ZA - ZC
Z cross line ZC - ZB
N1Limit
d £ tripAngle
N2Limit
ANSI07000005 V1 EN
Figure 194: Simplified logic diagram for pole slip protection PSPPPAM (78)
Technical reference manual
AND
AND
AND
AND
Counter
a
a ³ b
b
Counter
a
b a ³ b
Section 6
Impedance protection
PICKUP
ZONE1
ZONE2
TRIP1
AND
OR
TRIP2
AND
en07000005_ansi.vsd
TRIP
365