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BUENO ELECTRIC
BUENO ELECTRIC
BUENO ELECTRIC
BUENO ELECTRIC
Contact: [email protected]
Fax: +86-25-51816989
20
tn is internal delay of program and fixed tn is 1.5s.
PT breakage criterion of generator terminal:
Three-phase line breakage: three-phase non-pressure; current available in any phase. Three-phase
non-pressure (Ua<8V&&Ub<8V&&Uc<8V)
Current available in any phase (Ia>0.25A|| Ia>0.25A || Ia>0.25A)
One phase or two phases line breakage: (negative sequence voltage>10V)&&(positive sequence
Figure 5-6 Basic logic chart 2 of excitation loss protection
Signalling/tripping
System low voltage
&
t3/0
Metacentric
stability
impedance circle
generator terminalPT
breakage
Rotator low voltage
&
tn/0
&
+
t1/0
+
Signalling/trippin
Signalling/tripp
ing
t2/0
Signalling/trippi
Static stability impedance
circle
Generator
terminal
PT
breakage
Rotator low voltage
&
tn/0
&
+
t1/0
+
Figure 5-5 Basic logic chart 1 of excitation loss protection of generator
t2/0
Signalling/tripping